Impact-resistant styrenic polymer resin composition and process

Details Impact-resistant styrenic polymer resin composition and process Impact-resistant styrenic polymer resin composition and process

1993-09-28

1995-01-10

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...

525 98, 525 99, C08L 2504, C08L 5104, C08F27902

Patent

active

053807987

ABSTRACT:
An impact-resistant styrenic polymer resin composition comprising 70-97 wt. % of a styrenic polymer resin and 3-30 wt. % of a toughening agent of a fine particle form having an average particle diameter of 0.3-0.7 .mu.m and dispersed in the styrenic polymer resin. The toughening agent comprises (I) 10-98 wt. % of a styrene/butadiene di-block copolymer having (i) a weight average molecular weight (MW) of 30,000-1,000,000, (ii) a MW distribution of 1.00-1.20 as defined by the weight average MW
umber average MW ratio, (iii) a total bound styrene content of 30-70 wt. %, and (iv) a block styrene content of at least 60% based on the total bound styrene content; and (II) 2-90 wt. % of a styrene/butadiene copolymer rubber, polybutadiene or a mixture thereof, which has (i) a weight average MW of 1,000-1,000,000, (ii) a MW distribution of 1.00-1.60 as defined by the weight average MW
umber average MW ratio, (iii) a total bound styrene content of 0-15 wt. %, and (iv) a cis-1,4 bond content of 10-80 wt. %; and the toughening agent has a JIS A hardness not larger than 75.
The impact-resistant styrene polymer resin composition is prepared by subjecting a mixture of 3-30 wt. % of the toughening agent and 70-97 wt. % of the styrenic monomer or its mixture, to bulk polymerization or bulk-suspension polymerization.

REFERENCES:
patent: 4183877 (1980-01-01), Ibaragi et al.
patent: 4282334 (1981-08-01), Walter et al.
patent: 4294937 (1981-10-01), Whitehead
Database WPI, Week 9328, Derwent Publications Ltd., London, GB; AN 93-224341 & JP-A-5 148 331 (Nippon Zeon K.K.) 15 Jun. 1993 (Abstract).
Database WPI, Week 9011, Derwent Publications Ltd., London, GB; AN 90-080338 & JP-A-2 034 614 (Nippon Polystyrene) 5 Feb. 1990 (Abstract).

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