The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1992
Filed:
Jun. 04, 1990
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Abstract
A styrene-based resin composition comprising (A) a styrene-based polymer and (B) a rubber-like polymer dispersed in the styrene-based polymer. The dispersed particles of the rubber-like polymer comprise a styrene-butadiene-based block copolymer comprising 5 to 95% by weight of a conventional diblock-type polymer and 95 to 5% by weight of a tapered block-type polymer, wherein the butadiene unit content of the styrene-butadiene-based block copolymer is 6 to 16% by weight, based on the weight of the composition. The particles have a weight ratio of gel content to rubber-like polymer of 1.1:1 to 4.0:1 and have a swelling index of 5 to 20. The particles have an area average diameter of 0.1 to 0.9 .mu.m, with a ratio of area particle diameter to number average particle diameter of 1.0 to 1.8. The styrene-based resin composition has a high Izod impact strength and a high drop-weight impact strength, and further has excellent gloss and stiffness properties.