Process for preparing resistant vinyl halide polymers

Details Process for preparing resistant vinyl halide polymers Process for preparing resistant vinyl halide polymers

1975-12-02

1980-10-28

Henderson, C. A.

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

Synthetic resins

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

525 71, 525 80, 525 82, 525197, 525226, 525227, 525233, 525235, 525255, 525263, 525305, 525308, 526202, 526218, 526229, 526204, C08L 2706, C08F25904, C08L 4700, C08F 220

Patent

active

042308321

ABSTRACT:
Impact modified polyvinyl chloride is prepared by suspension polymerizing vinyl chloride in the presence of a dual catalyst system of a monomer soluble catalyst and a water soluble catalyst to form suspension polymer particles having irregular and porous surfaces, and then polymerizing, in the presence of the porous particles, monomers for forming gelled rubber-containing interpolymer particles having a Tg of less than 25.degree. C. No emulsification system is required for the rubber interpolymerization. Rubber-containing interpolymer particles in the order of 1 micron or less are formed on the surface of the suspension polyvinyl chloride particle. The process can be conducted in one reaction vessel and product contamination is reduced. The product can be used alone or blended with other thermoplastic polymers, such as polyvinyl chloride, to increase the impact strength thereof.

REFERENCES:
patent: 2565783 (1951-08-01), Schouteden
patent: 2652392 (1953-09-01), Hohenstein
patent: 2996469 (1961-08-01), Cole
patent: 2996470 (1961-08-01), Cole
patent: 3468859 (1969-09-01), Davies
patent: 3645870 (1972-02-01), Sagane
patent: 3705210 (1972-12-01), Mathieu
patent: 3933942 (1976-01-01), Kennedy

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