Thermoplastic moulding materials made from vinyl chloride polyme

Details Thermoplastic moulding materials made from vinyl chloride polyme Thermoplastic moulding materials made from vinyl chloride polyme

1987-06-22

1988-10-18

Lieberman, Allan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 83, 525 84, 525 85, 525 86, 525 87, C08L 902, C08L 2706, C08L 5104

Patent

active

047788500

DESCRIPTION:

BRIEF SUMMARY
The invention relates to thermoplastic moulding materials which are particularly suitable for the preparation of films and which are made from a vinyl chloride polymer, a thermoplastic graft polymer and a specific, hydrogenated nitrile rubber.
Combinations of hydrogenated nitrile rubbers of different degree of hydrogenation, chain structure and molecular weight are described, in particular for the preparation of rubber materials, for example in Japanese patent application No. 58/118,371, U.S. Pat. No. 4,486,480 and U.S. Pat. No. 3,700,637.
It has now been found that mixtures of a vinyl chloride polymer, a graft polymer and a specific hydrogenated nitrile rubber form thermoplastic moulding materials which are particularly suitable for the preparation of films, and that the moulded articles produced from such moulding materials have particularly excellent ageing resistance, thermoplastic processability, thermostability, expansion, heat distortion resistance and hardness.
The invention thus relates to thermoplastic moulding materials made from weight of vinyl chloride, styrene, acrylonitrile, methyl methacrylate and .alpha.-methyl styrene, on or acrylate rubber having average particle diameters of 0.08 to 1 um, and 28% by weight and the degree of hydrogenation is greater than 50%, and polymer optionally containing copolymerized up to 70% by weight of vinyl acetate, acrylonitrile, methyl methacrylate or carbon monoxide, alkyl acrylate polymer optionally containing copolymerized up to 50% by weight of vinyl acetate, acrylonitrile, methyl methacrylate or carbon monoxide.
Preferred moulding materials contain 10 to 90 parts by weight, in particular 15 to 50 parts by weight, of A, 90 to 10 parts by weight, in particular 85 to 50 parts by weight, of B and 10 to 50% by weight, relative to the sum of A+B, of component C.
Particularly preferred moulding materials additionally contain at least one of components D and E, in particular both components D and E, where the sum of components D and E must not make up more than 50% by weight of the moulding material. D and E are preferably employed in amounts from 10 to 25% by weight, relative to the moulding material.
In the context of the invention, vinyl chloride polymers A are, in particular, polyvinyl chloride, copolymers of vinyl chloride containing up to 50% by weight of copolymerizable compounds, preferably containing up to 20% by weight of copolymerizable compounds, and graft polymers of vinyl chloride on ethylene/vinyl acetate copolymers (in particular having vinyl acetate contents .ltoreq.50% by weight); compounds which can be copolymerized with vinyl chloride are, for example: vinyl esters having 1 to 8 C atoms in the alkyl radical of the carboxylic acid, vinyl ethers having 3 to 7 C atoms, maleic anhydride, semi-esters of maleic acid with aliphatic alcohols having 1 to 8 C atoms in the alcohol radical, and diesters of maleic acid with aliphatic alcohols having 1 to 8 C atoms in the alcohol radical.
Particularly preferred graft polymers B are prepared by graft polymerization of styrene/acrylonitrile mixture in the weight ratio 90:10 to 60:40, in particular 75:25 to 65:35, where the styrene, if appropriate, may be replaced completely or partially by methyl methacrylate or .alpha.-methyl styrene, on either butadiene homopolymer or copolymer with a butadiene content .ltoreq.35% by weight, having gel contents .gtoreq.50%, in particular .gtoreq.80%, and an average particle diameter of 0.09 to 1 .mu.m (d.sub.50 values), or an alkyl acrylate homopolymer or copolymer having an alkyl acrylate content .ltoreq.35% by weight, gel contents .gtoreq.50%, in particular .gtoreq.80%, and an average particular diameter of 0.09 to 1 .mu.m (d.sub.50 values).
Preferred rubbers B2 are butadiene homopolymers, butadiene/styrene copolymers, butadiene/alkyl acrylate copolymers, and also polybutyl acrylate, polyhexylethyl acrylate, copolymers of butyl acrylate and acrylonitrile or vinyl ether, and copolymers of vinyl acetate and butyl acrylate. Likewise preferred are particulate rubbers which

REFERENCES:
patent: 3700637 (1972-10-01), Finch, Jr.
patent: 4201829 (1980-05-01), Mast et al.
patent: 4242469 (1980-12-01), Schmitt et al.
patent: 4374952 (1983-02-01), Shedd et al.
patent: 4461868 (1984-07-01), Lindner et al.
patent: 4486480 (1984-12-01), Okumoto et al.

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