FIELD OF INVENTION:
The invention relates to a unique polymeric blend compound having good physical, mechanical, thermal, electrical properties alongwith weatherability. In particular, the invention relates to Polypropylene-poly vinyl chloride blend compound with suitable processability and good chemical resistance, heat deflection temperature, impact strength, tensile strength and modulus of elasticity, hinge and flexibility.
BACKGROUND:
Polyvinyl chloride (PVC) is known to have excellent resistance to chemical, oil, greases, ozone and solvents among other desirable physical properties. Typically, PVC has an excess of 55% bound chlorine. PVC is conveniently made by the polymerization of vinyl chloride monomer by any one of several available methods disclosed in the prior art.
Polyvinyl chloride (Polychloroethene) commonly abbreviated PVC, is a widely used thermoplastic polymer. In terms of revenue generated, it is one of the most valuable products of the chemical industry. Globally, over 50% of PVC manufactured is used in construction. As a building material, PVC is cheap and easy to assemble. In recent years, PVC has been replacing traditional building materials such as wood, concrete and clay in many areas. Despite appearing to be an ideal building material, concerns were raised about the costs of PVC to the natural environment and human health.
There are many uses for PVC. As a hard plastic, it is used as vinyl siding, magnetic stripe cards, window profiles, gramophone records (which is the source of the name for vinyl records), pipe, plumbing and conduit fixtures. The material is often used in plastic pressure pipe systems for pipelines in the water and sewer industries because of its inexpensive nature and flexibility. PVC pipe plumbing

is typically white, as opposed to ABS, which is commonly available in grey as well as white. It can be made softer and more flexible by the addition of plasticizers, the most widely used being phthalates. In this form, it is used in clothing and upholstery, and to make flexible hoses and tubing, flooring, to roofing membranes, and electrical cable insulation.
Despite appearing to be an ideal building material, concerns were raised about the costs of PVC to the natural environment and human health.
Polypropylene (PP) is a thermoplastic material made by the chemical industry and used in a wide variety of applications, including food packaging, ropes, textiles, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes. An addition polymer made from the monomer propylene, it is rugged and unusually resistant to many chemical solvents, bases and acids.
Poly vinyl chloride (PVC) is one of the most widely used thermoplastic material because of its excellent oil, chemical and water resistance, strength and abrasion resistance, flame-retardant quality when tested to most accepted methods, fiber and pigment-binding qualities, relatively low cost and thermoforming characteristics .
These properties are shared in varying degrees by all polyvinyl chloride polymers and are related to the fundamental structure of PVC. The presence of strong intermolecular attraction in Polyvinyl chloride results in a tough, resistant polymer. This attraction can be modified by plasticization or copolymerization, which can increase flexibility and softness while retaining much of the toughness and abrasion resistance .
The first PVC blends were introduced in the late 1920s. These were prepared by latex blending with

PVAc and poly (vinylchloride-co-vinylacetate) PVCAc. I.G. Farbenindustrie commercialized PVC extruder-blended with polyacrylic ester . PVC blended with Buna-N produced excellent thermoplastic materials. These blends were prepared either on rubber-mill, by latex blending then extruding. These moisture-proof blends were mainly used as leather substitutes. This was the first use of a copolymer as compatibilizers.
To improve thermo-mechanical properties of PVC various approaches were employed viz; additives like phthalates, maleates, waxes, metal stearates, and calcium carbonate were added to facilitate processing & thermal stability. Some co-polymers were also used to improve thermo-mechanical behavior of PVC compound . Most of the work in this area has been carried out using organic materials which are either polymers or organic / inorganic additives .
PVC is antagonistically immiscible with PO. Thus the standard strategies are applicable: 1. addition of a small amount of PO to improve processing and Impact strength 2. co-continuous morphology, 3. incorporation of PO as part of a copolymer comprising miscible with PVC segments, and 4. compatibilized blends. Owing to difficulties in compatibilization, the PVC/PO blends are not yet commercial [Liang et al., 1999].
There are various blends of PVC commercially available. PVC blended with NBR was commercialized in 1936 by Bergisch-Gladbach. Most recently acidification of NBR made it possible to incorporate the NBR/PVC blends with PA, PC. Acrylates have been incorporated into PVC Blends quite early. Inspite of PVC miscibility with PMMA, blends of these two polymers are not commercially important. To be useful these blends must be toughened, preferably by acrylic elastomers. PVC Blends with modified ABS are also done and the blends with more than 30% wt PVC are self extinguishing, but are more difficult to process. PVC is antagonistically immiscible with PO. Thus the standard strategies are applicable: 1. addition of a small amount of PO to improve processing and Impact strength 2. co-continuous morphology, 3. incorporation of PO as part of a copolymer comprising miscible with PVC segments, and 4. compatibilized blends. Owing to difficulties in compatibilization, the PVC/PO

blends are not yet commercial [Liang et al., 1999].
US4767817 describes a thermoplastic polyblend that contains a PO and PO-G (PO/PO-G) as a first continuous single phase, PVC and CPE as the second and third dispersed phases, and the relative amounts of the components are chosen so that there is, at most, an equal amount by weight of PO and PO-G each of which may be present in an amount as high as 40 parts by weight when the PVC is present in an amount in the range from 40 to 70 parts. Further, a glass fiber reinforced (GFR) polyblend of PVC/CPE/PO/PO-G having a HDT of at least 95° C and sufficient thermoformability to form the desired article has excellent notched impact strength. In the GFR polyblend the fibers are preferably long, at least 3 mm, and from 10-20 microns in diameter. The high HDT is obtained provided only if both co-compatibilizers and glass fibers are present in the reinforced composite.
US 4,789,589 describes a conductor wire with an inner layer of insulation of cellular polyolefin compound and an outer layer of polyvinyl chloride. The polyvinyl chloride includes a material compatible with the polyolefin and which bonds to the polyolefin to bond the layers together. The compatible material may be chlorinated polyethylene. In the insulated structure, the inner layer has a substantially continuous skin which is bonded to the outer layer. In a method of forming the insulation, the inner layer is maintained as a non-cellular structure which the outer layer is extruded onto it. This provides unbroken opposing surfaces of the layers which are bonded together and the integrity of the surface of the inner layer is maintained as the layer is formed into a cellular structure.
US 6,063,846 describes a thermoplastic composition comprising a polyvinyl chloride resin, an external plasticizer, a polyolefin selected from the group consisting of (i) a copolymer of ethylene and 1-octene, wherein said copolymer is a metallocene-catalyzed polymerization product of ethylene and 1-octene, (ii) a copolymer of ethylene and 1-butene, and (iii) a copolymer of ethylene, propylene and a non-conjugated diene monomer, and a compatibilizer selected from the group consisting of chlorinated polyolefins, polyolefin-polyurethane graft copolymers, hydrogenated styrene-butadiene-styrene-

polyester tetrablock copolymers, and hydrogenated styrene-isoprene-styrene-polyester tetrablock copolymers, wherein the thermoplastic composition includes from about 5 to about 31 parts compatibilizer per 100 parts of the poly vinyl chloride and the external plasticizer combined.
US 6,124,406 describes the use of blocky chlorinated polyolefins to compatibilize polyolefin elastomers with polyvinyl chloride (PVC) and/or chlorinated polyvinyl chloride (CPVC). The purpose of compatibilizing a polyolefin elastomer with PVC or CPVC is to form a dispersed polyolefin elastomer phase in the PVC or CPVC which can impart impact modification (act as impact modifier) to the PVC or CPVC resin without unduly detracting from thermal stability, modulus, tensile strength, heat distortion temperature, weatherability and chemical resistance of the compounded PVC or CPVC resin.
US 6,417,260:Compositions of a plasticized polyvinyl chloride resin, a polyolefin and/or a styrenic polymer, and a compatibilizer are disclosed. The compositions retain the mechanical properties of tensile strength, elongation, and a low brittle point, even after being subjected to high heat for an extended period of time.
All the prior arts describes the use of a plasticizer. However, owing to the low molecular weights of the plasticizers, these tend to migrate to the surface and evaporate. Their loss causes premature brittleness that shortens the useful life-span of the material. The oily surface of the molding as well as the smell of the plasticizer also made it less appealing to customers. Permanent plasticization by blending PVC with polymeric materials was soon recognized as the best long term solution. These plasticizers imparts foul smell to the product.
Both the polymers are distinctly unique in themselves but have certain limitation if used for flame retardant high insulation applications. Thus, there currently exists a need for a Polypropylene-polyvinyl chloride composition having a balance of good physical properties; and chemical resistance, which can be easily processed.

In particular, the objective of the invention is to provide a Polypropylene-poly vinyl chloride compound which at a minimum meets at a minimum a heat deflection temperature above 150° F and has a balance of physical properties as well as chemical resistance without adding plasticizer.
Both the polymers are distinctly unique in themselves but have certain limitation if used for flame retardant high'insulation applications.
Further objective is to provide a unique blend compound having good physical properties including, impact strength, tensile strength and modulus of elasticity.
In particular, the invention relates to Polypropylene-polyvinyl chloride blend compound with suitable
processability and good chemical resistance.
Following characteristic properties have been observed from the blend material:
• Flame resistance
• Electrical Insulating Characteristics
• Abrasion resistance
• Good Weatherability
• Resistance to Chemical, Oil, Greases, Ozone and Solvents
• Toughness
• Rigidity
• Heat Resistance
• Negligible water absorption
• Resistance to Environmental Stress Cracking
• Dielectric Properties
• Range of colorability
• Hinges

SUMMARY:
The present invention comprises a novel polyolefm-polyvinyl chloride blend compound maintaining suitable processability. In particular, the present invention comprises a unique blend of polypropylene-polyvinyl chloride resin from 26% by weight to 65% by weight and polyolefin from 26% by weight to 65% by weight made from a novel process with the help of a compatibilizing agent. The compatibilizing agent or compatibilizer is a compound that acts as a hanger unit for both the polymer matrices. Blending is done on a high speed mixer or ribbon blender. Both the polymers along with other additives and compatibilizer are added to the required doses to get the suitable heat stability and processibility. The additives are the processing aids like stabilizer and optionally a lubricant and antioxidant.
The blend is processed on a rolling mill or on an extruder.
The blend can be processed on any of various other devices for shaping materials or performing other mechanical operations.
DETAILED DESCRIPTION OF INVENTION:
The present invention comprises a novel polyolefm-polyvinyl chloride blend compound maintaining suitable processability.
Miscibility of polymer blends depends upon the balance of small enthalpy and non-configurational entropic effects. Most polymers form immiscible blends that require compatibilization. The compatibilizing strategies comprise:
• Addition of small quantity of co-solvent- a third component miscible with both phases
• Addition of a copolymer whose one part is miscible with one phase and another with another
phase
• Addition of a large amount of core-cell copolymer- compatibilizers cum impact modifier

• Reactive compounding that leads to modification of at least one macromolecular species that
results in development of locally miscibility regions
• Mechano-chemical blending.
Following studies was carried out for physio-chemical and mechanical properties of the polymer blends prepared in the present work for which the test equipments and standards was as given below-
• TENSILE STRENGTH
To measure the mechanical strength of the polymer blend, the Tensile Strength & Elongation Test was
carried out as per ASTM D 638 standard.
The significance of this test is to measure mechanical strength of the polymer blend.. Tensile strength
of a material is the maximum amount of Tensile Stress that it can be subjected to before failure.
This test was performed on Zwick Roell Testing machine, with a load cell accuracy of 0.01 Newton. 5
numbers of dumble specimen was prepared for each set of test and mean value of Tensile Strength and
Elongation at Break was reported for the set.
• HARDNESS
The hardness was evaluated as per ASTM D 2240 standard.
Hardness may be defined as "The resistance of plastic to indentation, penetration & deformation". The
greater the hardness of the material, the greater resistance it has to deformation.
To measure it ATS FAAR make Shore a hardness tester was used. The result obtained from this test
will provide a useful measure of relative resistance to indentation.
• MELT FLOW INDEX
This study provides a tentative idea of polymers molecular weight and helps to determine the processing temperature and time. To determine MFI of the blend material, ASTM D 3364 standard was

taken into account.
It may be defined as the weightof polymer in grams flowing in 10 minutes through a capillary of
specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for
alternative prescribed temperatures.
To study MFI of blends Ceast make Melt Flow Tester was used.
• SPECIFIC GRAVITY
It is defined as the ratio of the weight of the material in air to the weight loss in water.
We follow ASTM D 792 standard to check the specific gravity of the blends. Sartorious Density Kit
was used to check the Specific Gravity of the blends.
• THERMAL STABILITY
To check the heat stability of the blend material IS-5831 standard was followed which gives a idea of relative resistance of the material to thermal exposure i.e. the duration of converting a congo red paper from red to blue color when the material is heated at specified temperature. A Thermal Stability bathe of S.A.Associates make was used for the purpose
• DIFFERENTIAL SCANNING CALORIMETRY
We used Perkin Elmer Diamond DSC for analyzing the Tg & Tm points of blends
• COLD BEND TEST
Cold Bend Test provides an idea about the performance of material at lower temperature. Extruded cylindrical tube of the blend was exposed at -40°C temperature for 3 hrs in the cold chamber and was directly wrapped on mandrel of specified dimension.
We followed IS 10810 Part-20 standard for the purpose and will use ATS FAAR model Climatic Chamber for the purpose of test.

• SCANNING ELECTRON MICROSCOPY
SEM studies was carried out to establish morphological structure of the blend.
• INFRARED SPECTROSCOPY
FTIR studies was carried out on Perkin Elmer Model Spectrum One FTIR to analyze spectroscopic studies of the blend.
The present invention is related to the co-polymer path for the purpose of blending. The present invention comprises a unique blend of polypropylene-poly vinylchloride resin from 26% by weight to 65% by weight and polypropylene from 26% by weight to 65% by weight made from a novel process with the help of a compatibilizating agent. The compatibilizing agent or compatibilizer is a compound that acts as a hanger unit for both the polymer matrices. Blending is done on a high speed mixer and ribbon blender. Both the polymers along with other necessary additives and compatibilizer are added to the required doses to get the suitable heat stability and processibility. The additives are the processing aids like stabilizers and optionally an antioxidant and a lubricant.
For the process, blends are prepared using commercially available PVC resin with K-Value of 50 to 89
as base polymer along with polyolefm resin with the help of a compatibilizer. Other processing aids
added to the blend mixture are stabilizers and optionally antioxidants and a lubricant.
Typically blends of immiscible copolymers exhibit a coarse and unstable phase morphology with poor
interfacial strength. The resulting poor mechanical properties can be improved with a small amount of
an interfacial agent. The compatibilizing agent may be a graft or copolymer added as a third polymeric
agent (US 6124406). The compatibilizing agent or compatibilizer is a compound that acts as a hanger
unit for both the polymer matrices.
Typical examples of compatibilizers are chlorinated polyolefins.

Preferred compatibilizers are 35% chlorinated polypropylene, methacrylate butadiene styrene, ethylene vinyl acetate carbon mono oxide, nanocalcium carbonate or combinations thereof.
In the process of invention, based on the ratio of polyvinylchloride to polypropylene used, 17% to
46% by weight of compatibilizer is added.
Polymer stablizers may be used to protect polymers from oxidation, heat or shear during processing, or
from long term sunlight exposure, heat, hydrolysis or oxidation during use.
The stabilizing system used for PVC comprising calcium, cadmium, lead, barium, tin stabilizers, or
combinations thereof.
Preferred stabilizer is a calcium zinc stabilizer or a tin stabilizer.
The olefin monomers have preferably 2 to 10 Carbon atoms.
The preferred polyolefin is a polypropylene polypropylene resin of melt index 3 to 30.
The blend is processed on a rolling mill or on an extruder.
The blend can be processed on any of various other devices for shaping materials or performing other
mechanical operations.
Blending was done on High Speed Mixer at a temperature upto 80° C for 5 to 20 minutes. This premix was then processed on a Two Roll Mill at a processing temperature range of 160° C to 180° C for 15-20 minutes. Milled sheets were then Compression molded at 170° C to 180° C at 300 KN pressure for 10 minutes to prepare the test specimens.

EXAMPLES: Experiment 1
In first trial, Polypropylene granule of 30 MI was used for blending with PVC. To the PVC Resin of K-70 (64.5%), Polypropylene 30 MI granules (27.6 %), Ca-Zn stabilizer (2.8%), Irganox-1076 (0.5%), and 35%Chlorinated Polypropylene (4.6 %) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 2
To the PVC resin of K-70 (65.2 %), Polypropylene 30 MI granules (27.9 %.), Ca-Zn stabilizer (1.4%), Irganox-1076 (0.8 %), and 35%Chlorinated Polypropylene (4.7 %) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170°C.
Experiment 3
To the PVC resin of K-70 (44.2%), Polypropylene 30 MI granules (44.2%.), Ca-Zn stabilizer (2%), Irganox-1076 (0.6%.), and 35% Chlorinated Polypropylene (8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 4
To the PVC resin of K-70 (61.7%), Polypropylene 30 MI granules (26.4%), Ca-Zn stabilizer (2.6%), Irganox-1076 (0.4%), and 35% Chlorinated Polypropylene(8.8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.

Experiment 5
To the PVC resin of K-70 (64.5%), Polypropylene 3 MI powder (27.6%), Ca-Zn stabilizer (2.6%), Irganox-1076 (0.5%), and 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 6
To the PVC resin of K-70 (27.9%), Polypropylene 3 MI powder (65.2%), Ca-Zn stabilizer (1.4%), Irganox-1076 (0.6%), and 35% Chlorinated Polypropylene (4.7%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 7
To the PVC resin of K-70 (64.3%), Polypropylene 3 MI powder (27.5%), Ca-Zn stabilizer (2.8%), Irganox-1076 (0.8%), and 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 8
To the PVC resin of K-70 (27.7%), Polypropylene 3 MI powder (64.6%), Ca-Zn stabilizer (1.4%), Irganox-1076 (1.7%), and 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.

Experiment 9
To the PVC resin of K-70 (64.8%), Polypropylene 3 MI powder (27.8%), Tin stabilizer (1.7%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), and 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 10
To the PVC resin of K-70 (27.8%), Polypropylene 3 MI powder (64.8%), tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), and 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 11
To the PVC resin of K-70 (61.9%), Polypropylene 3 MI powder (26.5%), tin stabilizer (1.6%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), Methacrylatebutadienestyrene (4.4%) and Elvaloy (4.4%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was" processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 12
To the PVC resin of K-70 (26.5%), Polypropylene 3 MI powder (61.9%), tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (1.6%), Methacrylatebutadienestyrene (4.4%) and Elvaloy

(4.4%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 13
To the PVC resin of K-50 (27 %), Polypropylene 3 MI powder (63%), Tin stabilizer (1.6%), Ca-Zn stabilizer (2.7%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), 35% Chlorinated Polypropylene (4.5%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 14
To the PVC resin of K-50 (63.9%), Polypropylene 3 MI powder (27.4%), Tin stabilizer (0.8%), Ca-Zn stabilizer (1.4%), Glycerolmonostearate (0.4%), Irganox-1076 (1.6%), 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 15
To the PVC resin of K-70 (66.7%), Polypropylene 3 MI powder (28.6%), Tin stabilizer (1.7%), Glycerolmonostearate (0.4%), Irganox-1076 (0.9%), AB-101 compatibilizer (1.7%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.

Experiment 16
To the PVC resin of K-70 (28.8 %), Polypropylene 3 MI powder (67.3%), Tin stabilizer (0.9%), Glycerolmonostearate (0.4%), Irganox-1076 (1.7%), AB-101 compatibilizer (0.9%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 17
To the PVC resin of K-70 (61.9%), Polypropylene 3 MI powder (26.5%), Tin stabilizer (1.6%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), 35% Chlorinated Polypropylene (8.8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 18
To the PVC resin of K-70 (26.5%), Polypropylene 3 MI powder (61.9%), Tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (1.6%), 35% Chlorinated Polypropylene (8.8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 19
To the PVC Resin of K-70 (56.9%), PP 3 MI powder (24.4%), Tin stabilizer (1.5%), Glycerolmonostearate (0.3%), Irganox-1076 (0.7%), 35% Chlorinated Polypropylene (16.2%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.

Experiment 20
To the PVC resin of K-70 (24.4%), Polypropylene 3 MI powder (56.9%), Tin stabilizer (0.7%), Glycerolmonostearate (0.3%), Irganox-1076 (1.5%), 35% Chlorinated Polypropylene (16.2%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 21
To the PVC resin of K-70 (56.9%), Polypropylene 3 MI powder (24.4%), Tin stabilizer (1.5%), Glycerolmonostearate (0.3%), Irganox-1076 (0.7%), Methacrylatebutadienestyrene (8.1%) and Elvaloy (8.1%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 22
To the PVC resin of K-70 (24.4%), Polypropylene 3 MI powder (56.9%), Tin stabilizer (0.7%), Glycerolmonostearate (0.3%), Irganox-1076 (1.5%), Methacrylatebutadienestyrene (8.1%) and Elvaloy (8.1%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 23
To the PVC resin of K-50 (64.8%), Polypropylene 10 MI powder (27.8%), Tin stabilizer (1.7%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8% ), 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was

processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 24
To the PVC resin of K-50 (27.8%), Polypropylene 10 MI powder (64.8%), Tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (1.7%), 35% Chlorinated Polypropylene (4.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 25
To the PVC resin of K-50 (63 %), Polypropylene 10 MI powder (27%), Ca-Zn stabilizer (2.7%), Tin stabilizer (1.6%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), 35% Chlorinated Polypropylene (4.5%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 26
To the PVC resin of K-50 (27.4%), Polypropylene 10 MI powder (63.9%), Ca-Zn stabilizer (1.4%), Tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (1.6%), 35% Chlorinated Polypropylene (4-.6%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.

Experiment 27
To the PVC resin of K-70 (61.9%), Polypropylene 3 MI powder (26.5%), Tin stabilizer (1.6%), Glycerolmonostearate (0.4%), Irganox-1076 (0.8%), AB-101 compatibilizer (8.8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
Experiment 28
To the PVC resin of K-70 (26.5%), Polypropylene 3 MI powder (61.9%), Tin stabilizer (0.8%), Glycerolmonostearate (0.4%), Irganox-1076 (1.6%), AB-101 compatibilizer (8.8%) was added in a high speed mixer and mixed for 5 minutes upto 70°C vessel temperature. The mix was processed on a Two Roll mill at processing temperature of 175°C. 2 mm thick sheets was prepared via compression molding at 170 °C.
For all the samples so produced by the experiments IR studies was carried out (400 - 4000 cm"1) using compressed thin films on FTIR Spectrophotometer to determine the structure. Static and dynamic thermal stability and DSC studies was carried out to understand the thermal behavior of these blends. Physico-mechanical studies was carried out as per standard methods. For morphological studies of the blends, SEM test was carried out.
RESULT
(TableRemoved)

We claim:
1. A polymeric blend comprising:
(i) polypropylene; (ii) polyvinylchloride; (iii) a compatibilizer selected from chlorinated polypropylene, methacrylate butadiene styrene, ethylene vinyl acetate carbon mono oxide, nanocalcium carbonate or combinations thereof.; (iv) a stabilizer; and optionally (v) an antioxidant; and (vi) a lubricant.
2. A method of making a polymeric blend comprising: mixing polyvinylchloride resin,
polypropylene granules, compatibilizer along with a stabilizer, and optionally an antioxidant,
and a lubricant.
3. A polymeric blend as claimed in claim 1 or 2, wherein the polymeric blend material comprises
of 26% to 65% by weight of the polypropylene, 26% to 65% by weight of the polyvinylchloride
and 17% to 46% by weight of compatibilizer, 0.5% to 3% by weight of stabilizer, 0.5% to
1.5% by weight of antioxidant, and optionally a lubricant.
4. The polymeric blend as claimed in claim 1 or 2, wherein the polypropylene has a melt index of
3 to 30.
5. The polymeric blend as claimed in claim 1 or 2, wherein the polyvinylchloride has a K-value of
50-89.
6. A polymeric blend as claimed in claim 1 or 2, wherein the antioxidant are selected from the
group of phosphites and hindered phenols, preferably Irganox-1076.
7. A polymeric blend as claimed in claim 1 or 2, wherein the stabilizer comprises of calcium,
cadmium, lead, barium, tin stabilizers, or combinations thereof, preferably a Ca-Zn stabilizer or
a Sn stabilizer.
8. A polymeric blend as claimed in claim 1 or 2, wherein the lubricant is glycerolmonostearate.
9. A method of making a polymeric blend as claimed in claim 2, wherein the ingredients are
mixed in a high speed mixer for 5 to 20 minutes.
10. A method of making a polymeric blend as claimed in claim 2, wherein the ingredients are
mixed until the temperature of vessel of the mixer attains a temperature upto 80° C.

11. A polypropylene polyvinylchloride blend composition, substantially as hereinbefore described with reference to the foregoing examples.
12. A method for manufacture of a polypropylene polyvinylchloride blend composition, substantially as hereinbefore described with reference to the foregoing examples.'