C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/4905
C08F 265/04 (2006.01) C08F 285/00 (2006.01) C08L 51/04 (2006.01) C08L 57/00 (2006.01)
Patent
CA 1111990
ABSTRACT OF THE DISCLOSURE 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 thermo- set 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 cross- linked poly(n-butylacrylate), a rubber-like (or intermediate) layer derived from a monomer mixture containing n-butylacryl- ate and an addition monomer and an outer layer (or shell) derived from a monomer mixture containing styrene and methyl- methacrylate.
314965
Goodrich (b.,f.) Company (the)
Sherman
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