Process for producing rubber modified thermoplastic resin

Details Process for producing rubber modified thermoplastic resin Process for producing rubber modified thermoplastic resin

1983-05-05

1984-12-25

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525289, 525290, 525309, 525310, C08F25506, C08F25504

Patent

active

044905076

ABSTRACT:
A process for producing a rubber-modified thermoplastic resin by graft-copolymerizing a monomeric component composed of an aromatic alkenyl compound, an alkenyl cyanide compound and a methacrylic acid ester compound on an ethylene-propylene rubber, characterized in that the first reaction step, a monomer mixture composed of an aromatic alkenyl compound and an alkenyl cyanide compound or a mixture composed of these two compounds and 20% by weight or less of a methacrylic acid ester is graft-copolymerized on an ethylene-propylene rubber until the polymerization conversion reaches 30 to 70% by weight, and in the second reaction step, a methacrylic acid ester compound or a mixture of a methacrylic acid ester compound and 20% by weight or less of at least one other copolymerizable monomer is polymerized in the presence of the reaction mixture obtained in the first reaction step until the polymerization reaction is substantially completed. The rubber-modified thermoplastic resin obtained by this process is excellent in impact resistance, appearance of molded article and colorability.

REFERENCES:
patent: 3671607 (1972-06-01), Lee
patent: 3959408 (1976-05-01), Yusa et al.
patent: 3984496 (1976-10-01), Morimoto et al.
patent: 4154777 (1979-05-01), Shoji et al.

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