Injection molding of styrene resin

Details Injection molding of styrene resin Injection molding of styrene resin

1990-02-20

1993-01-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432817, 26433113, B29B 1108, B29K 906, B29C 4573

Patent

active

051805359

ABSTRACT:
A method of injection molding a styrene resin or a composition thereof, which includes injection molding a molten molding resin material of a styrene-conjugated diene block copolymer containing 50 to 90% by weight of a styrene polymer or a molten molding resin material of a resin composition comprising 50% by weight or more of the styrene-conjugated diene block copolymer and 50% by weight or less of a styrene resin other than the styrene-conjugated diene block copolymer, wherein the molten resin is injected and filled into a mold with a wall surface temperature at core and cavity portions within the mold being made 110.degree. to 180.degree. C., and the molded product is demolded when the wall surface temperature of the core and cavity portions is lowered to the glass transition temperature or lower of the styrene polymer moiety in the block copolymer. The obtained molded product has a high impact resistance.

REFERENCES:
patent: 3009206 (1961-11-01), Salyer et al.
patent: 4386188 (1983-05-01), Grancio et al.
patent: 4836960 (1989-06-01), Spector et al.

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