Title of the Invention: LAMINATE
5 Technical Field
[0001]
The present invention relates to a laminate.
Background Art
[0002]
10 Techniques for bonding a substrate such as a plastic
film, a vapor deposition film, a metal foil, paper, or a
nonwoven fabric to another adherend or bonding substrates to
each other by heat or pressure (that is, performing heat
sealing) have been widely used in various industrial fields.
15 In this heat-sealing technique, usually, an adhesive layer
capable of being bonded by heat and pressure is provided on a
substrate in advance, and the substrate and another adherend
or the substrates are bonded to each other with the adhesive
layer interposed therebetween.
20 [0003]
For example, in JP S57-137339 A, heat sealing is
performed through an adhesive layer formed by applying an
aqueous dispersion composition of a modified product of
ethylene, α,β-unsaturated carboxylic acid, and an α,β-
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unsaturated metal carboxylate copolymer.
Citation List
Patent Literature
5 [0004]
Patent Literature 1: JP S57-137339 A
Summary of Invention
Technical Problem
10 [0005]
Depending on, for example, the type and use
application of the substrate and the adherend, further
improvement in low-temperature adhesiveness, water
resistance, and hot water resistance may be required.
15 An object of the present invention is to provide a
laminate having an adhesive layer excellent in lowtemperature adhesiveness, water resistance, and hot water
resistance.
20 Solution to Problem
[0006]
The present invention includes the following
inventions [1] to [6].
[1] A laminate including:
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a substrate; and an adhesive layer laminated on at
least one surface of the substrate,
in which the adhesive layer is obtained by drying a
coated product of an aqueous dispersion containing water and
5 a resin (X), and
the resin (X) contains two or more kinds of ethyleneunsaturated carboxylic acid copolymers (a) each having a
different content of a structural unit derived from an
unsaturated carboxylic acid.
10 [0007]
[2] The laminate described in [1], in which the total
content of the structural units derived from an unsaturated
carboxylic acid included in the two or more kinds of
ethylene-unsaturated carboxylic acid copolymers (a) is 5
15 mass% or more and less than 18 mass% based on the total
amount of structural units derived from monomers of the
polymer contained in the resin (X).
[0008]
[3] The laminate described in [1] or [2], in which the
20 two or more kinds of ethylene-unsaturated carboxylic acid
copolymers (a) include one or more kinds of each of
an ethylene-unsaturated carboxylic acid copolymer (a1)
having a content of a structural unit derived from an
unsaturated carboxylic acid of 12 mass% or more and 30 mass%
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or less, and
an ethylene-unsaturated carboxylic acid copolymer (a2)
having a content of a structural unit derived from an
unsaturated carboxylic acid of more than 0 mass% and less
5 than 12 mass%.
[0009]
[4] The laminate described in [3], in which the two or
more kinds of ethylene-unsaturated carboxylic acid copolymers
(a) satisfy at least one of the following conditions (i) and
10 (ii):
(i) including two or more kinds of ethyleneunsaturated carboxylic acid copolymers each having a
different content of a structural unit derived from an
unsaturated carboxylic acid as the ethylene-unsaturated
15 carboxylic acid copolymer (a1); and
(ii) including two or more kinds of ethyleneunsaturated carboxylic acid copolymers each having a
different content of a structural unit derived from an
unsaturated carboxylic acid as the ethylene-unsaturated
20 carboxylic acid copolymer (a2).
[0010]
[5] The laminate described in [4], in which as the
ethylene-unsaturated carboxylic acid copolymer (a1),
an ethylene-unsaturated carboxylic acid copolymer (a1-
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1) having a content of a structural unit derived from an
unsaturated carboxylic acid of 17 mass% or more and 30 mass%
or less, and
an ethylene-unsaturated carboxylic acid copolymer (a1-
5 2) having a content of a structural unit derived from an
unsaturated carboxylic acid of 12 mass% or more and less than
17 mass% are included.

CLAIMS
[Claim 1]
A laminate comprising:
5 a substrate; and an adhesive layer laminated on at
least one surface of the substrate,
in which the adhesive layer is obtained by drying a
coated product of an aqueous dispersion containing water and
a resin (X), and
10 the resin (X) contains two or more kinds of ethyleneunsaturated carboxylic acid copolymers (a) each having a
different content of a structural unit derived from an
unsaturated carboxylic acid.
[Claim 2]
15 The laminate according to claim 1, in which the total
content of the structural units derived from an unsaturated
carboxylic acid included in the two or more kinds of
ethylene-unsaturated carboxylic acid copolymers (a) is 5
mass% or more and less than 18 mass% based on the total
20 amount of structural units derived from monomers of the
polymer contained in the resin (X).
[Claim 3]
The laminate according to claim 1 or 2, in which the
two or more kinds of ethylene-unsaturated carboxylic acid
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copolymers (a) include one or more kinds of each of
an ethylene-unsaturated carboxylic acid copolymer (a1)
having a content of a structural unit derived from an
unsaturated carboxylic acid of 12 mass% or more and 30 mass%
5 or less, and
an ethylene-unsaturated carboxylic acid copolymer (a2)
having a content of a structural unit derived from an
unsaturated carboxylic acid of more than 0 mass% and less
than 12 mass%.
10 [Claim 4]
The laminate according to claim 3, in which the two or
more kinds of ethylene-unsaturated carboxylic acid copolymers
(a) satisfy at least one of the following conditions (i) and
(ii):
15 (i) including two or more kinds of ethyleneunsaturated carboxylic acid copolymers each having a
different content of a structural unit derived from an
unsaturated carboxylic acid as the ethylene-unsaturated
carboxylic acid copolymer (a1); and
20 (ii) including two or more kinds of ethyleneunsaturated carboxylic acid copolymers each having a
different content of a structural unit derived from an
unsaturated carboxylic acid as the ethylene-unsaturated
carboxylic acid copolymer (a2).
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[Claim 5]
The laminate according to claim 4, in which as the
ethylene-unsaturated carboxylic acid copolymer (a1),
an ethylene-unsaturated carboxylic acid copolymer (a1-
5 1) having a content of a structural unit derived from an
unsaturated carboxylic acid of 17 mass% or more and 30 mass%
or less, and
an ethylene-unsaturated carboxylic acid copolymer (a1-
2) having a content of a structural unit derived from an
10 unsaturated carboxylic acid of 12 mass% or more and less than
17 mass% are included.