Book Details The name of the invention: stretched laminated film Technical field [0001] 　The present invention relates to stretched multilayer film excellent in heat-sealing properties, and more particularly heat seal layer excellent in heat-sealing properties and hot tack properties to the substrate layer is laminated, such as in particular high-speed packaging applications about stretched laminate film suitably used in. Background technique [0002] 　Edible workpiece (fish meat, ham, sausage, etc.), dairy products (cheese, butter, etc.), or in a work of packaging the packaged articles such as instant food liquid soup, in order to improve the production speed of the package, for example, using a vertical bag filling machine (VFFS), a packaging bag with a high speed formation of a plastic film which is continuously fed, high speed closing the packaging bag in substantially the same time objects to be packaged with the packaging bag formed in a vertical direction High-speed filling and sealing methods are becoming gradually penetrate the industry (e.g., Patent documents 1 and 2). In the high speed packaging with VFFS, falls vertically in the lower sealing portion to be packaged is not chilled immediately after heat sealing enough. Thus, for example, when the package item is heavy, or if there is a protrusion on the packed material shape is likely to breakage it will tear the lower sealing surface by dropping of the packaged articles. To prevent such a problem, Lord performance required for the heat seal layer is highly heat-sealing properties (i.e., exhibits high heat seal strength at lower than the current sealing temperature, or even the current temperature, and performance) expressing high heat-sealing strength in a shorter sealing time, high hot tack (i.e., a strong sealing portion even in a high temperature state during heat-sealing temperature of the sealing portion is not chilled sufficiently a two-point performance) showing adhesion. In this field, conventionally a linear low density polyethylene (L-LDPE) resin film that is based but has been widely used, in order to correspond to the filling and sealing speed is increasingly faster, more excellent request of the laminated film for high speed packaging with heat-sealing properties and hot tack is strengthened with. CITATION Patent Document [0003] Patent Document 1: Laid-Open Patent Publication No. 2009-51212 Patent Document 2: Laid-Open Patent Publication No. 2013-18161 Summary of the Invention Problems that the Invention is to Solve [0004] 　The present invention was conducted by focusing on the above situation, and its object is broken fast sealing sealing portion even in the case of using a packaging means such as e.g. a vertical bag filling machine (VFFS) package to be produced a stretched laminate film without causing the bag to provide the obtained from the stretched laminated film packaging bag, and the packaging body to be packaged is accommodated in the packaging bag. Means for Solving the Problems [0005] 　The gist of the present invention is as follows. [0006] [1] Differential scanning calorimetry melting point measured by the measurement (DSC) (Tm) is at 170 ° C. or less 120 ° C. or higher, propylene polymer structural units derived from propylene is more than 50 mol% (A) 50 ~ 97 weight parts, and 　melting point measured by differential scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, as well as carbon atoms 3 or 5-20 constituent units 10 to 90 mole% derived from alpha-olefins [wherein, the total amount of constituent units derived from structural units of the carbon atoms 3 or 5 ~ 20 alpha-olefins derived from 1-butene is 100 mol% it is. ] 1-butene-based polymer (B) 3 ~ 50 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] Stretched laminated film having a heat seal layer comprising a resin composition and a base material layer containing a. [0007] [2] Differential scanning calorimetry melting point measured by the measurement (DSC) (Tm) is at 170 ° C. or less 120 ° C. or higher, propylene polymer structural units derived from propylene is more than 50 mol% (A) 50 ~ 97 weight parts, 　melting point measured by differential scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, as well as carbon atoms 3 or 5 ~ 20 alpha- constituent units 10 to 90 mole% derived from olefins [here, the total amount of constituent units derived from structural units of the carbon atoms 3 or 5 ~ 20 alpha-olefins derived from 1-butene is 100 mol% . Containing 1- butene polymer (B) 3 ~ 50 parts by weight, and, 　the structural unit 50-99 mole% derived from ethylene and structural units derived from α- olefin having 3 to 20 carbon atoms 1-50 mol% [here, the total of the structural units and structural units derived from α- olefin of 3 to 20 carbon atoms derived from ethylene is 100 mol%. Ethylene · alpha-olefin copolymer (C) 3 ~ 30 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] Stretched laminated film having a heat seal layer comprising a resin composition and a base material layer containing a. [0008] [3] Propylene-based polymer (A) is a propylene-based polymer measured melting point (Tm) is lower than 120 ° C. or higher 0.99 ° C. by differential scanning calorimetry (DSC) (a1) 80 ~ 100 wt%, and, propylene polymer melting point measured by the method (Tm) is 0.99 ° C. or higher 170 ° C. or less (a2) 0 ~ 20 wt% [here, the component (a1) and the total amount is 100% by weight of component (a2) it is. Stretched laminated film according to [1] or [2] containing. [4] The propylene polymer (A) is a propylene-based polymer measured melting point (Tm) is lower than 120 ° C. or higher 0.99 ° C. by differential scanning calorimetry (DSC) (a1) 95 ~ 99 wt%, and, propylene polymer melting point measured by the method (Tm) is 0.99 ° C. or higher 170 ° C. or less (a2) 1 ~ 5 wt% [here, the component (a1) and the total amount is 100% by weight of component (a2) it is. Stretched laminated film according to [1] or [2] containing. [5] 1-butene-based polymer (B) is a melting point as measured by differential scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, and , the structural unit 10 to 90 mole% derived from propylene [here, the total amount of constituent units derived from the structural units and propylene derived from 1-butene is 100 mol%. Stretched laminated film according to [1] or [2] is a the containing 1-butene-based polymer (B '). [6] 1-butene-based polymer (B ') is, melting point measured by differential scanning calorimetry (DSC) (Tm) is at 90 ° C. or higher 110 ° C. or less of 1-butene-based polymer (b1), the method melting point (Tm), as measured by is less than 90 ° C. 65 ° C. or higher 1-butene-based polymer (b2), and a melting point as measured by the method (Tm) is lower than 65 ° C. 1-butene-based polymer ( stretched laminated film according to [5] containing one or more of 1-butene-based polymer selected from the group consisting of b3). [7] 1-butene-based polymer (B ') is 1-butene-based polymer (b1), 1-butene-based polymer (b2), and, from the group consisting of 1-butene-based polymer (b3) stretched laminated film according to [6], including two or more 1-butene-based polymer selected. [8] stretched laminated film according to 1-butene-based polymer (b1) and 1-butene-based polymer (b2) is the a polymer produced by metallocene catalysis [6]. [9] the [1] or a packaging bag around the stretched laminated film according is sealed by a heat seal layer on the inner side in [2]. [10] packaging body to be packaged in packaging bag is accommodated according to [9]. Effect of the Invention [0009] 　Stretched laminated film of the present invention, 110 ° C. or higher, of course, show a sufficient heat-seal strength even when heat-sealed at a lower temperature in the temperature range of about 70 ~ 100 ° C.. Moreover, such reduction in the hot tack strength at low temperature heat sealing property than 110 ° C. as a concern film having is reduced, indicating sufficient hot tack strength at high temperatures. Therefore, it is suitably used in applications such as packaging film when the object to be packaged at high speed filling and sealing, for example, by using a vertical bag filling machine (VFFS). BRIEF DESCRIPTION OF THE DRAWINGS [0010] FIG. 1 is a schematic sectional view showing an example of a stretched laminated film of the present invention. DESCRIPTION OF THE INVENTION [0011] 　Hereinafter, detailed embodiments of the present invention. [0012] 　(Stretched laminate film) 　stretched laminated film of the first embodiment, 　differential scanning calorimetry (DSC) melting point (Tm) as measured by is at 170 ° C. or less 120 ° C. or higher, the constituent units derived from propylene 50 mol% more than propylene polymer (a) 50 ~ 97 parts by weight, and 　a melting point as measured by differential scanning calorimetry (DSC) (Tm) is less than 120 ° C., the structural units 10 to 90 moles derived from 1-butene %, and the structural unit 10-90 mole% derived from α- olefin having 3 carbon atoms or 5 to 20 wherein the structural unit and carbon atoms 3 or 5 to 20 derived from 1-butene α- the total amount of the constituent units derived from the olefin is 100 mol%. ] 1-butene-based polymer (B) 3 ~ 50 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] And the heat seal layer comprising a resin composition containing an a stretched laminated film having a substrate layer. [0013] 　Stretched laminated film of the second embodiment, 　the component (A) 50 ~ 97 parts by weight, 　the component (B) 3 ~ 50 parts by weight, and, 　the structural unit 50-99 mole% derived from ethylene, and carbon atoms 3 ~ constituent unit 1 derived from 20 of the α- olefin 50 mole% [here, the total of the structural units and structural units derived from α- olefin of 3 to 20 carbon atoms derived from ethylene is 100 mol it is%. Ethylene · alpha-olefin copolymer (C) 3 ~ 30 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] And the heat seal layer comprising a resin composition containing an a stretched laminated film having a substrate layer. [0014] 　Hereinafter, an example of the stretched laminated film of the present invention will be described with reference to FIG. Oriented laminated film 30 shown in FIG. 1 includes a heat seal layer 10 and the substrate layer 20. Heat seal layer 10 constituting the stretched laminated film 30, the component (A) as a main component. In addition to the components (A), in the first embodiment is incorporated in a specific ratio is component (B), the component in the second embodiment (B) and component (C) is blended in a specific ratio that. [0015] 　The stretched laminated film, from the viewpoint of production easiness, usually stretched laminated film heat seal layer 10 was also stretched together also base layer 20 the same stretch ratio (co stretched laminated film) are preferred. However, the unstretched base layer 20 in some applications, only the heat seal layer 10 may be in a form which is stretched. That is, the "stretched laminated film" in the present invention means a laminated film forms at least the heat sealing layer has been stretched, the presence or absence of stretching the substrate is optional. [0016] 　To prepare the co-stretched laminated film, for example by using two extruders which T-die is connected, the resin composition constituting the heat seal layer, a resin composition constituting the substrate layer, respectively fed to the extruder, first by co-extrusion to produce a laminate of the unstretched state. In this case, the thickness of the laminate of the unstretched state, for example, may be set within a range of 50 [mu] m ~ 5000 .mu.m. The ratio of the thickness of the heat seal layer and the base layer of the unstretched state, for example 1:99 to 99: may be set within a range. [0017] 　The laminate of this unstretched state, co-stretched laminate film is obtained by stretching, for example, by stretching machine. Stretched laminate film total thickness of such a co-stretched laminated film is preferably 1 [mu] m ~ 500 [mu] m. [0018] 　Having described embodiments of the present invention, these are illustrative of the present invention, it is possible to adopt various other configurations. [0019] 　The following describes the heat seal layer 10 and the substrate layer 20 constituting the stretched laminated film 30. [0020] 　(Heat seal layer) 　is heat-sealing layer 10 in the stretched laminated film of the first embodiment, consists of components (A) and (B) is a resin composition formulated in appropriate proportions. Further, the heat seal layer 10 in the stretched laminated film of the second embodiment, consisting of component (A), component (B) and component (C) is a resin composition formulated in appropriate proportions. [0021] 　The resin composition constituting the heat seal layer 10 in the stretched laminated film of the first embodiment, components (A) 50 ~ 97 parts by weight and component (B) 3 ~ 50 parts by weight [wherein the component (A) component (B) the total amount comprises 100 parts by weight. Preferred resin composition comprises components (A) 60 ~ 95 parts by weight and component (B) 5 ~ 40 parts by weight. More preferred resin composition comprises components (A) 70 ~ 90 parts by weight and component (B) 10 ~ 30 parts by weight. [0022] 　Second resin composition constituting the heat seal layer 10 in the stretched laminated film of the embodiment is different from the components (A) and (B) total 100 parts by mass of the first embodiment, 3 to 30 parts by weight , preferably from 3 to 20 parts by weight, more preferably 5 to 15 parts by weight of component (C). [0023] 　[Component (A)] 　Component (A), differential scanning calorimetry (DSC) melting point (Tm) as measured by is at 170 ° C. or less 120 ° C. or higher, the propylene constituent units derived from propylene greater than 50 mole% it is a polymer. Even in this propylene polymer (A) is homopolypropylene, (but excluding propylene) of the propylene-carbon atoms 2 ~ 20 alpha-olefin may be a random copolymer, a propylene block copolymer and it may be. Constituent units derived from propylene to total components (A) beyond the normal 50 mol%, preferably 60 mol% or more, more preferably 70 mol% or more. In the present invention homopolypropylene and / or propylene - (but excluding propylene) of carbon atoms 2 ~ 20 alpha-olefin random copolymer is preferably used. [0024] 　As the component (A), from the viewpoint of imparting heat resistance and rigidity to the heat seal layer 10, it is particularly preferable to use homopolypropylene. From the viewpoint of imparting flexibility and transparency heat seal layer 10 (but excluding propylene) alpha-olefin propylene C2-20 it is preferable to use a random copolymer. Homo (but excluding propylene) polypropylene and propylene-carbon atoms 2 ~ 20 alpha-olefin which is one of the also preferable be used in combination of random copolymer. [0025] 　The propylene copolymerized with causing α- olefins, such as ethylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene , 1-dodecene, 1-tetracene, 1-hexadecene, 1-octadecene, 1-eicosene. It is also one of the preferred embodiment using two or more kinds of α- olefins. Especially As the component (A), isotactic propylene-based polymer are preferable. [0026] 　The isotactic propylene-based polymer, an isotactic pentad fraction measured by NMR method is 0.9 or more, a propylene-based polymer is preferably 0.95 or more. Expressing this isotactic pentad fraction in percentage of 90% or more, preferably 95% or more. [0027] 　Isotactic pentad fraction (mmmm fraction), 13 is indicative of the presence proportion of isotactic chains in the pentad fraction units in the molecular chain, as measured using a C-NMR, Specifically, 13 is calculated as a fraction of mmmm peak in the total absorption peaks in the methyl carbon region observed in C-NMR [0028] 　mmmm fraction, 13 P at C-NMR spectrum mmmm (absorption intensity derived from the third methyl group in the site in propylene units continuously 5 units coupled isotactic) and P w (total methyl propylene unit from the absorption intensity of absorption intensity) derived from the group obtained by the following equation. 　mmmm fraction P = mmmm / P W [0029] 　NMR measurements are performed as follows, for example using NMR measuring device. That heats dissolve the sample 0.35g hexachlorobutadiene 2.0 mL. After the solution was filtered with a glass filter (G2), added deuterated benzene 0.5 mL, charged to an NMR tube having an inner diameter of 10 mm. Then at 120 ° C. 13 performs C-NMR measurement. Number of integration is 10,000 times or more. [0030] 　Component (A) melting point (Tm) as measured by differential scanning calorimetry (DSC) of is at 170 ° C. or less 120 ° C. or more, preferably 168 ° C. 125 ° C. inclusive. [0031] 　Component (A), the propylene-based polymer measured melting point (Tm) is less than 0.99 ° C. 120 ° C. or higher by differential scanning calorimetry (DSC) (a1) 80 ~ 100 wt%, preferably 85 to 100 mass%, more preferably 90 to 99 mass%, particularly preferably 95 to 99 mass%, and the melting point measured by the method (Tm) is less than 170 ° C. 0.99 ° C. or higher propylene polymer (a2) 0 ~ 20 wt% , preferably 0-15% by weight, more preferably 1 to 10 mass%, particularly preferably 1 to 5 wt% [here, the total amount is 100% by weight of component (a1) and the component (a2). Forms, including] also preferred. [0032] 　Component (a1) the melting point (Tm) of the is less than 120 ° C. or higher 0.99 ° C., preferably from 125 ℃ ~ 145 ℃, more preferably 128 ℃ ~ 142 ℃. Component (a2) the melting point (Tm) of the are at 0.99 ° C. or higher 170 ° C. or less, preferably 155 ° C. ~ 170 ° C., more preferably 160 ℃ ~ 170 ℃. [0033] 　By melting point (Tm) is used component (A) in a specific range, excellent sealing strength heat sealing layer 10, hot tack, moldability, heat resistance is imparted. Further, it is preferred that at the same time resulting heat of fusion ([Delta] H) is 50 mJ / mg or more. Melting point (Tm) and heat of fusion of the components (A) (ΔH) is measured as follows, for example. [0034] 　That is, using a Perkin Elmer DSCPyris1 or DSC7, under a nitrogen atmosphere (20 ml / min), and held for about 5mg sample increased in temperature and 10 minutes to 200 ° C., and then cooled to -100 ° C. at 10 ° C. / min. After holding for 1 minute at -100 ° C., it can be obtained melting peak apex of the crystal melting peak when the temperature was raised to 200 ° C. at 10 ° C. / min. Also it can be obtained from the peak area heat of fusion ([Delta] H) also. [0035] 　A melt flow rate of component (A) (MFR; ASTM D1238,230 ℃, under 2.16kg load) is preferably 0.01 ~ 400 g / 10 min, more preferably 0.1 ~ 100 g / 10 min. By using the component (A) having such MFR values, improves fluidity of the resin composition, it becomes easy to mold a relatively large sheet. [0036] 　When using a propylene · alpha-olefin (except propylene) random copolymer as component (A), alpha-olefin, be selected from the carbon atoms 2 ~ 20 alpha-olefin (except propylene) preferable. The content of α- olefin is preferably 0.1 to 8 mol%, more preferably 0.2 to 7.5 mol%, particularly preferably 0.3 to 7 mol. [0037] 　Molecular weight distribution as determined by gel permeation chromatography of the components (A) (GPC) (Mw / Mn) is preferably 3.0 or less, more preferably 2.0 to 3.0, particularly preferably 2.0 ~ 2.5. [0038] 　The molecular weight distribution (Mw / Mn), for example using a Waters Corp. Gel permeation chromatograph Alliance GPC-2000 Model, may be measured as follows. The separation column used two and TSKgel (R) 2 the GNH6-HTL manufactured by Tosoh Corporation of TSKgel (R) GNH6-HT, also the diameter 7.5mm any column size, and a length of 300 mm, column temperature was 140 ° C., it is used BHT (manufactured by Takeda Pharmaceutical) 0.025 wt% as o- dichlorobenzene (Wako Pure Chemical Industries, Ltd.) and antioxidants in the mobile phase is moved at 1.0 ml / min , sample concentration was 15 mg / 10 mL, the sample injection volume was 500 microliters, using a differential refractometer as a detector. Standard polystyrene having a molecular weight Mw <1000 Mw and> 4 × 10 6 using Tosoh Corporation for, 1000 ≦ Mw ≦ 4 × 10 6 using Pressure Chemical Co. for. [0039] 　Tensile modulus of component (A) is preferably 500MPa or more. The tensile modulus, in compliance with JIS K6301, using a JIS 3 dumbbell is span 30 mm, a tensile rate of 30 mm / min, a value measured at a temperature of 23 ° C.. [0040] 　Component (A) can be produced by various methods, for example, it can be produced using a stereoregular catalyst. Specifically, it can be produced using a catalyst formed from an electron donor according further required solid titanium catalyst component and an organometallic compound catalyst component. Specific examples of the solid titanium catalyst component, titanium trichloride or titanium trichloride composition specific surface area 100 m 2 supported on a carrier is / g or more solid titanium catalyst component or a magnesium, a halogen, an electron donor ( preferably the aromatic carboxylic acid ester or alkyl group-containing ether) and titanium as essential components, these essential components specific surface area 100 m 2 solid titanium catalyst component supported on a carrier is / g or more can be mentioned. It can also be produced using a metallocene catalyst. [0041] 　The organometallic compound catalyst component, organoaluminum compounds are preferred. Specific examples of the organic aluminum compound, trialkylaluminum, dialkylaluminum halide, alkylaluminum sesquihalide, alkyl aluminum dihalide, and the like. The organoaluminum compound can be appropriately selected depending on the type of the titanium catalyst component used. [0042] 　As the electron donor, a nitrogen atom, phosphorus atom, a sulfur atom, may be an organic compound having such a silicon atom or a boron atom. In particular, an ester compound having an atom such as described above, ether compounds are preferred. [0043] 　The catalyst may be activated by addition technique of the co-milling, etc., and α- olefin may be prepolymerized. [0044] 　[Component (B)] 　Component (B) has a melting point as measured by differential scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, and carbon atoms 3 or 5 ~ 20 α- ~ structural unit 10 derived from the olefin 90 mole% of [here, construction derived from structural units and having a carbon number 3 or 5 ~ 20 alpha-olefins derived from 1-butene the total amount of units is 100 mol%. Containing is a 1-butene-based polymer. [0045] 　The α- olefin having 3 carbon atoms or 5 to 20, from the viewpoint of easy availability and versatility, propylene is preferred. In the following description, the 1-butene-based polymer in the case of using propylene as α- olefins, referred to as component (B '). Melting point of component (B ') (Tm) is preferably from 40 ° C. ~ 115 ° C., more preferably from 45 ℃ ~ 110 ℃. [0046] 　A preferred form of the component (B), constituent units 10 to 80 mole% derived from 1-butene, and is derived from the structural units (particularly preferably propylene derived from α- olefin having 3 carbon atoms or 5-20 structural unit) containing 20 to 90 mol% 1-butene-based polymer. The use of such 1-butene-based polymer, easily express heat sealability and hot tack of the resin composition is excellent, excellent further handling of the resin composition. [0047] 　More preferred form of component (B '), the structural unit 10-50 mole% derived from 1-butene, as well as, propylene-1-butene copolymer having a unit 50-90 mole% derived from propylene is there. [0048] 　Component (B ') has a melting point as measured by differential scanning calorimetry (DSC) (Tm) is at 90 ° C. or higher 110 ° C. or less of 1-butene-based polymer (b1), melting point measured by the method (Tm) is 65 ° C. or more is less than 90 ° C. 1-butene-based polymer (b2), and is selected from the group consisting of melting point measured by the method (Tm) is lower than 65 ° C. 1-butene-based polymer (b3) preferably includes one or more 1-butene-based polymer. Further component (B '), the components (b1), and more preferably contains component (b2) and the component (b3) consisting essentially of two or more selected from the group of 1-butene-based polymer. Specifically, component (b1) and the component (b2) in combination, the component (b2) and the combination of component (b3), the component (b1) and the combination of component (b3), the component (b1) ~ component (b3) form together all the like. Among them, a combination system including the component (b2) as essential components, for example component (b1) and the combination of component (b2), the combination of component (b2) and the component (b3) is more preferable. [0049] 　Melting component (B) (Tm) can be measured by the following method. That is, using a Seiko Instruments Inc. DSC, and filled with samples of about 5mg to measurement aluminum pan, heated up to 200 ° C. at 100 ° C. / min, and held at 200 ° C. 5 min, thereafter 10 ° C. / min the temperature was lowered to -100 ° C., then the temperature was raised to 200 ° C. at 10 ° C. / min, it can be determined melting point (Tm) than the endothermic curve. [0050] 　Component molecular weight distribution as determined by gel permeation chromatography (GPC) of (B) (Mw / Mn) is preferably 3.0 or less, more preferably 2.0 to 3.0, particularly preferably 2.0 ~ 2.5. The Mw / Mn By setting the above range, it is possible to suppress the content of the low molecular weight component in the component (B). As a result, bleeding occurs becomes painful from the surface layer of the stretched laminated film, stickiness of the surface layer during storage of the stretched laminated film, it can be suppressed blocking. Method of measuring the Mw / Mn of component (B) is the same as the method of measuring the Mw / Mn of the components described above (A). [0051] 　Relationship between melting point of the component (B) (Tm) and the 1-butene constituent unit content M (mol%) preferably satisfies the following expression. 　-3.2M + 130 ≦ Tm ≦ -2.3M + 155 [0052] 　By Tm and M have the relationship satisfying the above equation, can be excellent in low temperature heat sealability, heat seal strength is high, to obtain a laminated film decreases little sealing strength by aging after stretching. [0053] 　A melt flow rate of component (B) (MFR; ASTM D1238,230 ℃, under 2.16kg load), preferably 0.1 ~ 30 g / 10 min, more preferably 0.5 ~ 20 g / 10 min, particularly preferably is 1.0 ~ 10g / 10 minutes. [0054] 　Component preferably in the form components (B) (B ') is, for example, can be suitably produced by copolymerizing 1-butene and propylene in the presence of a catalyst comprising a metallocene compound. Specifically, for example, a component melting point described above (Tm) is less than 110 ° C. 90 ° C. or higher (b1), melting point (Tm) is less than 90 ° C. 65 ° C. or more component (b2) are, for example, It can be suitably prepared by metallocene catalysis according the method described in WO2004 / 087,775 pamphlet or WO01 / 27124 pamphlet. Manufacturing method of the melting point (Tm) component is less than 65 ° C. (b3) is not particularly limited, may be used a metallocene catalyst, may be used Ziegler-Natta catalysts. [0055] 　Component (B), for example, in the presence of a catalyst comprising a transition metal compound represented by the following general formula (1a) and (1a), of 1-butene and carbon atoms 3 or 5 ~ 20 alpha-olefin (preferably it is preferred is 1-butene-based polymer obtained by copolymerizing a propylene). Transition metal compound (1a) ligand substituted cyclopentadienyl ring and substituted fluorenyl ring is crosslinked with carbon, a compound coordinated to the transition metal atom. [0056] 　Catalyst comprising a transition metal compound (1a) is a group consisting of organic metal compound (2a), the organoaluminum oxy-compound (2b), and, by reacting with the transition metal compound (1a) to form an ion pair compound (2c) it is preferred to include more of at least one compound selected. [0057] [Formula 1] [0058] Wherein (1a), R 1 and R 3 are hydrogen atoms, R 2 and R 4 is a hydrocarbon group or a silicon-containing group, R 2 and R 4 may be the or different from each identical, R 5 ~ R 14 is hydrogen, a hydrocarbon group or a silicon-containing group, R 5 ~ R 12 may be different from each other in the same, R 5 ~ R 12 substituents attached to adjacent carbon of binding to each other , may form a ring, R 13 and R 14 each may be the same or different, R 13 and R 14 may be bonded to each other to form a ring, M is a transition metal of group 4 in it, Y is a carbon atom, Q is halogen, hydrocarbon group, selected in the same or different combination from a neutral ligand capable of coordination by an anionic ligand or a lone pair, j is 1 to 4 of an integer. ] [0059] 　Specific examples of the hydrocarbon group described above include methyl group, ethyl group, n- propyl group, an allyl group, n- butyl group, n- pentyl group, n- hexyl, n- heptyl, n- octyl group, n- nonyl group, a linear hydrocarbon group such as n- decanyl group; an isopropyl group, tert- butyl group, amyl group, 3-methylpentyl group, 1,1-diethyl propyl group, 1,1-dimethylbutyl group , 1-methyl-1-propyl butyl group, 1,1-propyl butyl group, 1,1-dimethyl-2-methylpropyl group, 1-methyl-1-branched hydrocarbons such as isopropyl-2-methylpropyl group group; a cyclopentyl group, a cyclohexyl group, cycloheptyl group, cyclooctyl group, norbornyl group, a cyclic saturated hydrocarbon group such as adamantyl group; a phenyl group, a tolyl group, a naphthyl group, Biff Eniru group, phenanthryl group, a cyclic unsaturated hydrocarbon group such as an anthracenyl group; a benzyl group, cumyl group, 1,1-diphenylethyl group, substituted saturated hydrocarbon group having a cyclic unsaturated hydrocarbon group such as triphenylmethyl group a methoxy group, an ethoxy group, a phenoxy group, a furyl group, N- methylamino group, N, N- dimethylamino group, N- phenylamino group, pyrryl group, and the like heteroatom-containing hydrocarbon group such as a thienyl group can. [0060] 　Specific examples of the silicon-containing groups as described above, a trimethylsilyl group, triethylsilyl group, dimethylphenylsilyl group, diphenylmethylsilyl group, and the like triphenylsilyl group. [0061] 　R 5 ~ R 12 substituents attached to adjacent carbon of the may combine with each other to form a ring. Specific examples of the substituted fluorenyl groups in such a case, benzofluorenyl group, dibenzo fluorenyl group, octahydro-dibenzo fluorenyl group, octamethyloctahydrodibenzofluorenyl group, octamethyl-tetrahydrodicyclopentadiene such as a fluorenyl group can be mentioned. [0062] 　R 13 and R 14 is preferably an aryl group. The aryl group, the above-described cyclic unsaturated hydrocarbon group, a cyclic unsaturated hydrocarbon group substituted saturated hydrocarbon group, a furyl group, pyrryl group, etc. heteroatom-containing unsaturated cyclic hydrocarbon groups such as a thienyl group it can be mentioned. Also, R 13 , R 14 aryl group may be the same as or different from each other, they may be bonded to each other to form a ring. [0063] 　R is a substituent attached to the cyclopentadienyl ring 2 and R 4 is preferably a hydrocarbon group having 1 to 20 carbon atoms. Examples of the hydrocarbon group having 1 to 20 carbon atoms may be exemplified hydrocarbon groups described above. Among them, R 2 is tert- butyl group, an adamantyl group, more preferably a bulky substituent such as triphenylmethyl group. R 4 is a methyl group, an ethyl radical, R as n- propyl group 2 and more preferably sterically smaller substituent group than. Here, the sterically smaller say, refers to the volume that substituent occupies is small. [0064] R　is a substituent attached to the fluorenyl ring 5 ~ R 12 of, R 6 , R 7 , R 10 and R 11 that any two or more of is a hydrocarbon group of 1 to 20 carbon atoms It is preferred. Examples of the hydrocarbon group having 1 to 20 carbon atoms may be exemplified hydrocarbon groups described above. In particular the ease of synthesis of the ligand, symmetrical, ie R 6 and R 11 and R 7 and R 10 is preferably the same group. Among such preferred embodiments, R 6 and R 7 may form an aliphatic ring (AR-1), and, R 10 and R 11 same aliphatic ring with an aliphatic ring (AR-1) It includes the case that forms the (AR-2). [0065] 　Y bridging the cyclopentadienyl ring and the fluorenyl ring is a carbon atom. R is a substituent attached to the Y 13 and R 14 is preferably is simultaneously an aryl group having 6 to 20 carbon atoms. Examples of the aryl group having 6 to 20 carbon atoms, mention may be made of the aforementioned cyclic unsaturated hydrocarbon group, a cyclic unsaturated hydrocarbon group substituted saturated hydrocarbon group, a hetero atom-containing cyclic unsaturated hydrocarbon group . Also, R 13 and R 14 may be different from each other and each is same or may be bonded to each other to form a ring. As such substituents, fluorenylidene group, 10-hydro anthracite Seni alkylidene group, such as dibenzo cycloheptadienyl Eni isopropylidene groups are preferred. [0066] 　M is a transition metal of Group 4, specifically Ti, Zr, Hf, and the like. [0067] 　Q is a halogen, a hydrocarbon group, selected by the same or different combination from a neutral ligand capable of coordination by an anionic ligand or a lone pair of electrons. j is an integer of 1 to 4. When j is 2 or more, a plurality of Q may be the same or different from each other. [0068] 　Specific examples of the halogen include fluorine, chlorine, bromine, and iodine include those similar to the aforementioned specific examples of the hydrocarbon group. Examples of the anionic ligands, methoxy, tert- butoxy, alkoxy groups such as phenoxy, acetate, carboxylate groups such as benzoate, and sulfonate groups such as mesylate and tosylate. Specific examples of the neutral ligands capable of coordination by lone pair, trimethylphosphine, triethylphosphine, triphenylphosphine, organic phosphorus compounds such as diphenyl methyl phosphine, tetrahydrofuran, diethyl ether, dioxane, 1,2-dimethoxyethane ethers such as ethane and the like. Q is preferably at least one is a halogen or an alkyl group. [0069] 　Examples of such transition metal compound (1a), for example, dimethylmethylene (3-tert-butyl-5-methylcyclopentadienyl) fluorenyl zirconium dichloride, isopropylidene (3-tert-butyl-5-methylcyclopentadienyl dienyl) (2,7-di -tert- butyl fluorenyl) zirconium dichloride, isopropylidene (3-tert-butyl-5-methylcyclopentadienyl) (3,6-di -tert- butyl fluorenyl ) zirconium dichloride, isopropylidene (3-tert-butyl-5-methylcyclopentadienyl) (octamethyl octa hydride blunder benz fluorenyl) zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methylcyclopentadienyl enyl) (fluorenyl ) Zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methylcyclopentadienyl) (2,7-di -tert- butyl fluorenyl) zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methyl cyclopentadienyl) (3,6-di -tert- butyl fluorenyl) zirconium dichloride, diphenylmethylene (3-tert-butyl-5-methylcyclopentadienyl) (octamethyl octa hydride blunder benz fluorenyl) like zirconium dichloride, but it is not limited thereto. [0070] 　Component (B), the catalyst preferably is suitably used in producing the component (b1) and the component (b2) is a transition metal compound described above with (1a), an organometallic compound (2a), the organoaluminum oxy-compound (2b), transition metal compound (2c), and preferably contains at least one compound selected from the group consisting of compounds capable of reacting with the transition metal compound (1a) to form an ion pair (2c). These components (2a), (2b), (2c) is not particularly limited, preferably be used the compounds described in WO2004 / 087,775 pamphlet or WO01 / 27124 pamphlet. Specific examples thereof include the following. [0071] 　As an organic metal compound (2a), first and second group and 12, 13 Group organometallic compounds such as are used below. [0072] 　(2a-1) the general formula: R a m Al (OR b ) n H p X q 　(wherein, R a and R b may be the same or different from each other, hydrocarbon group of 1 to 15 carbon atoms, preferably represents a hydrocarbon group of 1 ~ 4, X is a halogen atom, m is 0 4 × 10 6 For using Tosoh Corporation, 10 3 ≦ Mw ≦ 4 × 10 6 were used Pressure Chemical Co. for. [0103] 　Ethylene in the polymer, propylene, alpha-olefin content] 　ethylene, propylene, the alpha-olefin content quantified using the JEOL Ltd. JNM GX-500 type NMR measuring apparatus was measured as follows . Samples 0.35g dissolved by heating hexachlorobutadiene 2.0 ml. After the solution was filtered with a glass filter (G2), of deuterated benzene 0.5ml added and put into a NMR tube having an inner diameter of 10 mm, at 120 ° C. 13 were C-NMR measurement. Cumulative number of times was 10,000 times or more. The resulting 13 by C-NMR spectra were quantified ethylene, propylene, the composition of the α- olefin. [0104] 　[Component (A) the melting point (Tm) of the] 　Perkin Elmer DSCPyris1 or DSC7, under nitrogen (20ml / min), held warm-10 minutes a sample of about 5mg to 200 ° C., then 10 ° C. / It was cooled to -100 ℃ in minutes. After holding for 1 minute at -100 ° C., it was determined melting point (Tm) from the peak apex of the crystal melting peak when the temperature was raised to 200 ° C. at 10 ° C. / min. [0105] 　[The melting point (Tm) of the component (B)] 　using a Seiko Instruments Inc. DSC, and filled with samples of about 5mg to measurement aluminum pan, heated up to 200 ° C. at 100 ° C. / min, 5 min at 200 ° C. holding, then cooled to -100 ° C. at 10 ° C. / min, then the temperature was raised to 200 ° C. at 10 ° C. / min, was determined melting point (Tm) than the endothermic curve. [0106] 　[Melt flow rate (MFR) of] 　and the component (A) (B) has a melt flow rate (MFR), conforming to ASTM D1238, 230 ° C., it was measured under 2.16kg load. The component (C), 190 ℃, employing the conditions of 2.16kg load. [0107] 　Heat seal strength] 　overlapping film to the stretched laminated film overlap heat seal layers to each other to produce a superimposed Teflon having a thickness of 50μm on both sides of the film (R) sandwiched by the sheet specimen. Then, install a heat seal bar of the heat seal tester (manufactured by Tester Sangyo Co., Ltd. TB-701B type) in width 5 mm × length 300 mm, was set vertically sealing bars at the same temperature. Heat sealing bar portion, the test specimen sandwiched (Teflon sheet / film / film / Teflon (registered trademark) sheet), was 0.5 seconds heat sealing at a pressure of 0.1 MPa. Then, Teflon remove the (R) sheet, and allowed to stand for one day at room temperature of the heat-sealed film portion about 23 ° C.. Slits of 15mm width to include a heat-sealed portion of the film, and chuck tensile portions which are not sealed tester ( "INTESCO Co. IM-20ST"). Then, to measure the 180 ° peel strength of the film at 300 mm / min. It performed 5 times the operation, and the average was taken as the heat seal strength. [0108] 　Hot Tack Strength 　was prepared sandwiched between PET film having a thickness of 12μm superimposed a strip film to a stretched laminated film was prepared by a method described later overlap heat seal layers to each other specimen. Seal area at the hot tack tester (Theller Inc. Model HT, see U.S. Pat. No. 5,331,858 and U.S. Pat. No. No. 5,847,284) is the width 25 mm, and depth 12.7 mm, the vertical seal bars the same temperature, and 0.5 seconds heat sealed at a pressure of 0.1 MPa, then 180 ° C. peel strength of the film at 400 mm / min was measured after 0.05 seconds. Performed 5 times the operation was an average value of the respective maximum strength and hot tack strength. [0109] 　The following illustrates the preparation example of a synthesis example of the metallocene type complex is a component of an olefin polymerization catalyst, and propylene-1-butene copolymer obtained by using the metallocene catalyst (component (b2) and (b1)) . [0110] 　[Synthesis Example] - Synthesis of metallocene complex 　- (1) 1-tert-butyl-3-Preparation of methyl cyclopentadiene 　under a nitrogen atmosphere, tert- butylmagnesium chloride 0.90 mol / diethyl ether 450ml solution (2.0 mol / L solution) in anhydrous diethyl ether 350ml added while maintaining the 0 ℃ under ice cooling was added dropwise 3-methyl cyclopentenone 43.7 g (0.45 mol) / dehydrated diethyl ether 150ml solution, stirred then at room temperature for 15 hours did. Further to this reaction solution, while maintaining the 0 ℃ under ice cooling was added dropwise to ammonium chloride 80.0 g (1.50 mol) / water 350ml solution was added and stirred then water 2500 ml. The obtained liquid organic phase was separated and washed with water. Further to the organic phase, under ice-cooling with 10% aqueous hydrochloric acid 82ml while maintaining 0 ° C., then stirred at room temperature for 6 hours. Obtained liquid organic phase was further separated, water, saturated aqueous sodium hydrogen carbonate solution, water, and washed with saturated aqueous sodium chloride solution in this order. Then dried over anhydrous magnesium sulfate (drying agent), the drying agent was filtered and the solvent was distilled off from the filtrate to obtain a liquid. The liquid was distilled under reduced pressure (45 ~ 47 ℃ / 10mmHg) to give a pale yellow liquid 14.6g by. It shows the analysis values below. 　1 H-NMR (270 MHz, CDCl 3 inside, TMS reference) δ6.31 + 6.13 + 5.94 + 5.87 (s + s + t + d, 2H), 3.04 + 2.95 (s + s, 2H), 2.17 + 2.09 (s + s, 3H) , 1.27 (d, 9H) [0111] 　(2) 3-tert-butyl -1,6,6- Preparation of trimethyl fulvene 　under nitrogen atmosphere, 1-tert-butyl-3-methylcyclopentadiene 13.0 g (95 obtained by the above method (1). to 6 mmol) / dehydrated methanol 130ml solution, while maintaining the 0 ℃ under ice cooling was added dropwise dehydrated acetone 55.2g (950.4mmol), followed by dropwise addition of pyrrolidine 68.0g (956.1mmol), followed 4 at room temperature days and the mixture was stirred. The reaction was diluted with diethyl ether 400 ml, was added additional water 400 ml. The obtained liquid organic phase was separated, four times with aqueous hydrochloric acid 150ml of 0.5 N, 3 times with water 200 ml, was washed once with saturated brine 150ml. Then dried over anhydrous magnesium sulfate (drying agent), the drying agent was filtered and the solvent was distilled off from the filtrate to obtain a liquid. To give a yellow liquid 10.5g By this liquid was distilled under reduced pressure (70 ~ 80 ℃ / 0.1mmHg) . It shows the analysis values below. 　1 H-NMR (270 MHz, CDCl 3 inside, TMS standard) δ6.23 (s, 1H), 6.05 (d, 1H), 2.23 (s, 3H), 2.17 (d, 6H), 1.17 (s, 9H) [0112] 　(3) 2- (3-tert- butyl-5-methylcyclopentadienyl) -2-fluorenyl propane Preparation 　fluorene 10.1 g (60.8 mmol) / 300 ml of THF solution, n- butyl under ice-cooling lithium 61.6 mmol / hexane 40ml was added dropwise under a nitrogen atmosphere, then stirred at room temperature for 5 hours. The resulting dark brown solution again cooled with ice was, the method (2) obtained in 3-tert-butyl -1,6,6- trimethyl fulvene 11.7 g (66.5 mmol) / 300 ml of THF solution under a nitrogen atmosphere in dropwise, and then stirred at room temperature for 14 hours. Further ice-cooled this brown solution was added water 200 ml. The organic phase of the resulting solution, extracted with diethyl ether and separated. Then drying the organic phase over magnesium sulfate (drying agent), the drying agent was filtered to give an orange-brown oil solvent from the filtrate was removed under reduced pressure. The oil was purified by silica gel column chromatography (developing solvent: hexane) to give a yellow oil 3.8 g. It shows the analysis values below. 　1 H-NMR (270 MHz, CDCl 3 inside, TMS standard) δ7.70 (d, 4H), 7.34 ~ 7.26 (m, 6H), 7.18 ~ 7.11 (m, 6H), 6 .17 (s, 1H), 6.01 (s, 1H), 4.42 (s, 1H), 4.27 (s, 1H), 3.01 (s, 2H), 2.87 (s, 2H), 2.17 (s, 3H ), 1.99 (s, 3H), 2.10 (s, 9H), 1.99 (s, 9H), 1.10 (s, 6H), 1. 07 (s, 6H) [0113] 　(4) Preparation of dimethylmethylene (3-tert-butyl-5-methylcyclopentadienyl) fluorenyl zirconium dichloride (metallocene complex) 　under ice-cooling, obtained by the above method (3) 2- (3 -tert- butyl-5-methylcyclopentadienyl) -2-fluorenyl propane 1.14 g (3.3 mmol) / diethyl ether 25ml solution, nitrogen n- butyl lithium 7.7 mmol / hexane 5.0ml solution It was added dropwise under an atmosphere, and then stirred at room temperature for 14 hours. To a slurry of the resulting pink, zirconium tetrachloride 0.77g of (3.3 mmol) was added at -78 ° C., stirred for several hours at -78 ° C., then stirred at room temperature for 65 hours. The resulting dark brown slurry was filtered, washing the filter cake with diethyl ether 10 ml, to give a red solution and extracted with dichloromethane. The solvent of this solution was evaporated under reduced pressure, dimethylmethylene (3-tert-butyl-5-methylcyclopentadienyl) a solid metallocene catalyst red orange 0.53g fluorenyl zirconium dichloride (metallocene complex) was obtained. It shows the analysis values below. 　1 H-NMR (270 MHz, CDCl 3 inside, TMS reference) δ8.11 ~ 8.02 (m, 3H ), 7.82 (d, 1H), 7.56 ~ 7.45 (m, 2H), 7 .23 ~ 7.17 (m, 2H) , 6.08 (d, 1H), 5.72 (d, 1H), 2.59 (s, 3H), 2.41 (s, 3H), 2. 30 (s, 3H), 1.08 (s, 9H) [0114] 　[Preparation Example 1] - propylene elastomer preparation of (component (b2)) - 　the polymerization apparatus of 2000ml which was thoroughly purged with nitrogen, dry hexane 875 ml, 1-butene 75g and triisobutylaluminum 1.0mmol were charged at room temperature, the polymerization apparatus internal temperature was raised to 65 ° C., was pressurized to 0.7MPa with propylene. Then, the above synthetic examples is a metallocene catalyst obtained in dimethylmethylene (3-tert-butyl-5-methylcyclopentadienyl) fluorenyl zirconium dichloride 0.002mmol and, in terms of aluminum 0.6mmol methylaluminoxane ( It was added Tosoh Finechem Corporation) and toluene solution was contacted to the polymerization vessel, 65 ° C. internal temperature, propylene pressure 0.75MPa and polymerized for 30 minutes while maintaining the, was added to terminate the polymerization methanol 20 ml. After depressurizing, a polymer was precipitated from the polymerization solution in methanol of 2L, under vacuum 130 ° C., then dried for 12 hours to obtain a propylene-1-butene copolymer 15.2 g. In the following description, the propylene elastomer is abbreviated as "PBR (b2)". [0115] 　PBR (b2) of 1-butene content (M) is 19.4 mol%, a melt flow rate (MFR) 6.5 g / 10 min, a molecular weight distribution (Mw / Mn) 2.11 and a melting point (Tm) of It was 75.3 ℃. [0116] 　[Preparation Example 2] - Preparation of Propylene-1-butene copolymer (component (b1)) - 　in the Preparation Example 1, the amount of 1-butene to 45 g, the propylene pressure during the polymerization (after catalyst addition) It was changed to 0.7MPa in the same manner as in preparation example 1 to obtain a propylene-1-butene copolymer. In the following description, the propylene elastomer is abbreviated as "PBR (b1)". [0117] 　PBR (b1) of 1-butene content (M) is 14.5 mol%, a melt flow rate (MFR) 6.7 g / 10 min, a molecular weight distribution (Mw / Mn) 2.12 and a melting point (Tm) of It was 98.4 ℃. [0118] 　[Example 1] 　(unstretched laminated film production 1) 　using T-die is connected two extruders, a resin composition for a resin composition and a substrate layer for the heat seal layer described below supplied to respective extruders, the die and a resin temperature of 230 ° C., extrusion rate of the heat seal layer and the ratio of the thickness of the base material layer (heat seal layer / substrate layer) each extruder so that the 2/23 set to obtain an unstretched laminate film 1 having a thickness of 1000μm by coextrusion. [0119] 　Heat seal layer of the resin composition: 　propylene random copolymer as component (A) (a1) (Lyon Dell Basell trade name Adsyl5C30F, propylene content = 91 mole%, ethylene content = 2 mole%, butene content = 7 mol%, MFR = 5.5g / 10 min, and Tm = 138 ° C.), the component (B) PBR (b2) obtained in preparation example 1 as a, r-PP (a1) / PBR (b2) = 85 / the resin composition obtained by blending with 15 weight ratio. The above propylene random copolymer (a1) is referred to as "r-PP (a1)". [0120] 　Base layer of the resin composition: 　propylene homopolymer (manufactured by Prime Polymer Co., Prime Polypro (registered trademark) F113G). [0121] 　(Stretched laminate production of the film 1) 　by unstretched laminate film 1 a batch type biaxial stretching machine, stretching temperature 158 ° C., at a stretching rate of 238% of the conditions, biaxially stretched 8 times vertical × horizontal = 5 times × ( after stretching stress relaxation 30 seconds) to obtain a stretched laminated film 1 (base layer thickness 23 .mu.m, the heat seal layer thickness of 2 [mu] m). [0122] 　(Heat seal strength and the measurement of the hot tack strength) 　Next, superposed stretched laminated film 1 as the heat seal layer overlap each other, superimposed on both sides of the film, the thickness of 50μm Teflon for heat seal measurement (R) sheet, a hot tack strength measurement was prepared sandwiched between PET film having a thickness of 12μm specimen. And according to the method of testing the heat seal strength and hot tack strength described above, the peel strength was measured of a specimen. Property values in Table 1. [0123] 　[Example 2] 　except for using the following resin composition as a resin composition for heat seal layer, to produce a stretched laminate film 2 in the same manner as in Example 1, was measured heat seal strength and hot tack strength . The results are shown in Table 1. [0124] 　Heat seal layer of the resin composition: 　a component (A) as r-PP (a1), component (B) PBR (b1) obtained by PBR (b2) and Example 2 obtained in Preparation Example 1 as, r-PP (a1) / PBR (b2) / PBR (b1) = 85 / 7.5 / 7.5 resin composition obtained by blending at a weight ratio of. [0125] 　Example 3 　except for using the following resin composition as a resin composition for heat seal layer, to produce a stretched multilayer film 3 in the same manner as in Example 1, was measured heat seal strength and hot tack strength . The results are shown in Table 1. [0126] 　Heat seal layer of the resin composition: 　component r-PP (a1) and a propylene homopolymer as (A) (a2) (manufactured by Prime Polymer Co., Prime Polypro (registered trademark) F107, MFR = 7.2g / 10 minutes , Tm = the 168.2 ° C.), the component (B) PBR obtained in preparation example 1 as (b2), (a1) / h-PP (a2) / PBR (b2) = 85 / 7.5 / 7 the resin composition obtained by blending in a mass ratio of .5. In the following description, the above propylene homopolymer (a2) is abbreviated as "h-PP (a2)". [0127] 　Example 4 　except for using the following resin composition as a resin composition for heat-sealing layer, to produce a stretched laminate film 4 in the same manner as in Example 1, was measured heat seal strength and hot tack strength . The results are shown in Table 1. [0128] 　Heat seal layer of the resin composition: 　component and r-PP (a1) as (A), and component (B) PBR obtained in Preparation Example 1 as (b2), an ethylene-1-butene copolymer as the component (C) polymer (manufactured by Mitsui Chemicals, Inc., ethylene content 90 mol%, MFR = 3.6g / 10 min, density = 870 kg / m 3 ) and, r-PP (a1) / PBR (b2) / EBR = 85/7. the resin composition obtained by blending at a weight ratio of 5 / 7.5. Note the resin composition, relative to 100 parts by weight of the total of components (A) and (B), a resin composition containing 8.1 parts by weight of component (C). The above ethylene-1-butene copolymer is abbreviated as "EBR". [0129] 　Example 5 　except for using the following resin composition as a resin composition for heat-sealing layer, to produce a stretched multilayer film 5 in the same manner as in Example 1, was measured heat seal strength and hot tack strength . The results are shown in Table 1. [0130] 　Heat seal layer of the resin composition: 　a component as (A) r-PP (a1 ) and h-PP (a2), the component (B) PBR obtained in Preparation Example 1 as (b2), r-PP ( a1) / h-PP (a2 ) / PBR (b2) = 85 / 1.5 / 13.5 resin composition obtained by blending at a weight ratio of. [0131] 　[Comparative Example 1] 　except for using the following resin as the resin composition for the heat seal layer, to produce a stretched laminate film 1 'in the same manner as in Example 1, was measured heat seal strength and hot tack strength. The results are shown in Table 1. [0132] 　Heat seal layer of the resin composition: 　component (A) as r-PP (a1) consisting only of resin. [0133] [Table 1] [0134] 　From the results apparent Table 1, stretched laminated film of Example 1-5, was excellent in heat sealing strength. For example, if the heat sealing temperature of 100 ° C., while the heat seal strength of the stretched laminated film heat seal layer of Comparative Example 1 is composed only of component (A) is approximately 0.1 N / 15 mm, Examples 1-5 was of the heat seal strength is about 40 times that. Excellent heat sealability in this low temperature was observed over a wide heat-sealing temperature range of 70 ~ 120 ° C.. Additionally, expressed Comparative Example 1 or more intensity in the range of low temperature region heat-sealing strength is expressed, namely 80 ~ 100 ° C. Also in hot tack strength in Examples 1-5. [0135] 　Further, tends to decrease somewhat hot tack strength of at least 110 ° C. at high film heat seal strength at low temperatures as in Example 1, contrast, high crystallinity as in Examples 3 and 5 obtained in the stretched laminated film from the propylene homopolymer hPP further resin composition comprising (a2) which is believed to contribute to the speed or high melt strength, when expressing a sufficient heat seal strength at low temperatures of 100 ° C. or less at the same time, reduction in hot tack strength at least the same temperature to the same temperature was suppressed. Industrial Applicability [0136] 　Stretched laminated film of the present invention it is recognized that express sufficient heat sealing strength and sufficient hot tack strength in a wide temperature range. Thus, for example, a vertical bag filling machine even when using a high-speed filling and sealing means (VFFS) or the like, suitably used as a packaging film that can be manufactured to be no package causing breakage of the seal portion It is. DESCRIPTION OF SYMBOLS [0137] 　10 heat seal layer 　20 base layer 　30 stretched laminate film The scope of the claims [Claim 1] 　Differential scanning calorimetry melting point measured by the measurement (DSC) (Tm) is at 170 ° C. or less 120 ° C. or higher, propylene polymer structural units derived from propylene is more than 50 mol% (A) 50 ~ 97 parts by weight, and , 　melting point measured by differential scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, as well as carbon atoms 3 or 5 ~ 20 alpha-olefin constituent units 10 to 90 mole% derived from [wherein, the total amount of constituent units derived from structural units of the carbon atoms 3 or 5 ~ 20 alpha-olefins derived from 1-butene is 100 mol%. ] 1-butene-based polymer (B) 3 ~ 50 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] Stretched laminated film having a heat seal layer comprising a resin composition and a base material layer containing a. [Claim 2] 　Differential scanning calorimetry melting point measured by the measurement (DSC) (Tm) is at 170 ° C. or less 120 ° C. or higher, propylene polymer structural units derived from propylene is more than 50 mol% (A) 50 ~ 97 parts by weight, 　a differential melting point measured by scanning calorimetry (DSC) (Tm) of less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, as well as guiding the α- olefins having 3 carbon atoms or 5-20 in the structural unit 10-90 mole% [here wither, the total amount of constituent units derived from structural units of the carbon atoms 3 or 5 ~ 20 alpha-olefins derived from 1-butene is 100 mol%. Containing 1- butene polymer (B) 3 ~ 50 parts by weight, and, 　the structural unit 50-99 mole% derived from ethylene and structural units derived from α- olefin having 3 to 20 carbon atoms 1-50 mol% [here, the total of the structural units and structural units derived from α- olefin of 3 to 20 carbon atoms derived from ethylene is 100 mol%. Ethylene · alpha-olefin copolymer (C) 3 ~ 30 parts by weight containing [here, the total amount of the components (A) and (B) is 100 parts by weight. ] Stretched laminated film having a heat seal layer comprising a resin composition and a base material layer containing a. [Claim 3] 　Propylene polymer (A) is a propylene-based polymer measured melting point (Tm) is less than 0.99 ° C. 120 ° C. or higher by differential scanning calorimetry (DSC) (a1) 80 ~ 100 wt%, and, by the same method propylene polymer measured melting point (Tm) is 170 ° C. or less 0.99 ° C. or higher (a2) 0 ~ 20 wt% [here, the total amount of the components (a1) and the component (a2) is 100 mass%. Stretched laminated film according to claim 1 or 2 including. [Claim 4] 　Propylene polymer (A) is a propylene-based polymer measured melting point (Tm) is less than 0.99 ° C. 120 ° C. or higher by differential scanning calorimetry (DSC) (a1) 95 ~ 99 wt%, and, by the same method propylene polymer measured melting point (Tm) is 170 ° C. or less 0.99 ° C. or higher (a2) 1 ~ 5 wt% [here, the total amount of the components (a1) and the component (a2) is 100 mass%. Stretched laminated film according to claim 1 or 2 including. [Claim 5] 　1-butene-based polymer (B) is a melting point as measured by differential scanning calorimetry (DSC) (Tm) is less than 120 ° C., the structural units 10 to 90 mole% derived from 1-butene, and propylene constituent units 10 to 90 mole% derived [here, the total amount of constituent units derived from the structural units and propylene derived from 1-butene is 100 mol%. Stretched laminated film according to claim 1 or 2 is a a containing 1-butene-based polymer (B '). [Claim 6] 　1-butene-based polymer (B ') is, melting point measured by differential scanning calorimetry (DSC) (Tm) is at 90 ° C. or higher 110 ° C. or less of 1-butene-based polymer (b1), it was measured by the same method melting point (Tm) is lower than 90 ° C. 65 ° C. or higher 1-butene-based polymer (b2), and, from the melting point measured by the method (Tm) is lower than 65 ° C. 1-butene-based polymer (b3) stretched laminated film according to claim 5 comprising one or more of 1-butene-based polymer selected from the group consisting of. [Claim 7] 　1-butene-based polymer (B ') is 1-butene-based polymer (b1), 1-butene-based polymer (b2), and, two selected from the group consisting of 1-butene-based polymer (b3) stretched laminated film according to claim 6, including a seed or 1-butene-based polymer. [8.] 　Stretched laminated film according to claim 6 butene polymer (b1) and 1-butene-based polymer (b2) is a polymer produced by metallocene catalysts. [Claim 9] 　Packaging bag around the stretched laminated film according to claim 1 or 2 is sealed by the heat seal layer on the inside. [Claim 10] 　Packaging body to be packaged is accommodated in the packing bag according to claim 9. Drawing [ Figure 1]