Process for production of styrene-based resin composition

Details Process for production of styrene-based resin composition Process for production of styrene-based resin composition

1993-09-17

1994-09-20

Kight, III, John

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, 525243, 525314, 525315, C08L 5104

Patent

active

053490134

ABSTRACT:
A process for producing a rubber-modified styrene-based resin. The process includes supplying a styrene-based monomer solution containing 5 to 20% by weight of a rubber component containing a styrene-butadiene-based block polymer rubber with a styrene content of 20 to 50% by weight to a first polymerization zone where initial polymerization is conducted to a conversion of 10 to 30%, and then supplying the resulting initial polymerization solution to a second polymerization zone where polymerization is conducted to a conversion of 30 to 70%, while at the same time phase inversion is caused, thereby controlling a rubber particle diameter to a range of 0.2 to 1.5 .mu.m and an area average rubber particle diameter
umber average rubber particle diameter ratio (Ds/Dn) to not more than 2.5. The process results in ease of removal of polymerization heat, reduced power for agitation and does not require a high strength apparatus. The rubber-modified styrene-based resin obtained by the process has a high impact strength, and excellent gloss and stiffness.

REFERENCES:
patent: 4485210 (1984-11-01), Weiditch et al.
patent: 4839418 (1989-06-01), Schwaben et al.
patent: 4952627 (1990-08-01), Morita et al.
patent: 5194491 (1993-03-01), Sakita et al.
patent: 5231142 (1993-07-01), Tsubokura

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