Soft-seeded tougheners for polyvinyl chloride

Details Soft-seeded tougheners for polyvinyl chloride Soft-seeded tougheners for polyvinyl chloride

1977-12-23

1979-11-06

Michl, Paul R.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

525 71, 525 80, 525 85, 525197, 525238, 525303, C08F27906

Patent

active

041735960

ABSTRACT:
The impact resistance of rigid polymeric resins (e.g. PVC, SAN, PMMA, etc.,) is enhanced by the incorporation therein of an improved toughener. This toughener comprises three distinct phases: (a) a core of thermoplastic or thermoset resin having a Tg below room temperature, (b) a rubber-like layer overpolymerized on the core, and (c) a relatively hard polymer layer overpolymerized on the rubber layer. The utilization of a "soft" core, or seed, apparently enhances the efficiency of the toughener in the rigid polymer. In one of the preferred embodiments of this invention, the improved toughener comprises a seed derived from a partially corss-linked poly(n-butylacrylate), a rubber-like (or intermediate) layer derived from a monomer mixture containing n-butylacrylate and an addition monomer and an outer layer (or shell) derived from a monomer mixture containing styrene and methylmethacrylate.

REFERENCES:
patent: 3787522 (1974-01-01), Dickie
patent: 3793402 (1974-02-01), Owens
patent: 3971835 (1976-07-01), Myers
patent: 4026970 (1977-05-01), Backderf

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