Rubber-modified styrene-based copolymer

Details Rubber-modified styrene-based copolymer Rubber-modified styrene-based copolymer

1992-04-29

1993-01-19

Seidleck, James J.

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

Synthetic resins

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

525238, 525241, C08L 5302, C08L 3320, C08L 2512, C08L 5300

Patent

active

051807807

ABSTRACT:
The rubber-modified styrene-based copolymeric resin of the invention comprises a matrix phase of a copolymer of styrene and acrylonitrile and a dispersed phase of particles of an S-B type block-copolymeric rubber of styrene and butadiene as prepared by the bulk-suspension polymerization method or continuous bulk polymerization of the monomers in the presence of the rubber. The rubber-modified styrene-based copolymeric resin is imparted with excellent rigidity, impact strength and appearance, in particular, in welded portions when it is prepared by adequately selecting several parameters including the weight proportion of the moieties derived from styrene and acrylonitrile in the matrix phase and content of styrene, solution viscosity, content of 1,2-unsaturated linkages, particle size and distribution thereof in the rubber constituting the dispersed phase.

REFERENCES:
patent: 3491166 (1970-01-01), Childers et al.
patent: 3526606 (1970-09-01), Minekawa et al.
patent: 3676527 (1972-07-01), Babcock, Jr. et al.
patent: 3907931 (1975-09-01), Durst
patent: 4748203 (1988-05-01), van Abeelan et al.
patent: 4771107 (1988-09-01), Hoenl
patent: 4839418 (1989-06-01), Schwaben et al.

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