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:
Nov. 06, 1979
Filed:
Nov. 27, 1978
Mitsubishi Rayon Co., Limited, Tokyo, JP;
Abstract
A multi-stage sequentially produced polymer structure composition, comprising: an innermost layer (A), and successively seed polymerized thereupon an elastic polymer layer (B), an outermost layer (C) and at least one intermediate layer (D), said layer (A) which has a glass transition temperature (Tg) of at least 10.degree. C. and which constitutes 5-35% by weight of the total polymer composition being the polymerized product of a monomer mixture comprising 51-100 parts by weight of styrene or a styrene derivative, 0-49 parts by weight of a monomer having a copolymerizable double bond, 0-10 parts by weight of a polyfunctional monomer, and 0-5 parts by weight of a graft crosslinking agent; said layer (B) which has a glass transition temperature of 0.degree. C. or less and which constitutes 5-55% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 60-100 parts by weight of a diene monomer, 0-40 parts by weight of a monomer having a copolymerizable double bond, 0-10 parts by weight of a polyfunctional monomer and 0-5 parts by weight of a graft crosslinking agent; said layer (C) which has a glass transition temperature of at least 50.degree. C. and which constitutes 10-70% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 51-100 parts by weight of styrene or a styrene derivative and 0-49 parts by weight of a monomer having a copolymerizable double bond; and said intermediate layer (D) which constitutes 5-45% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 20 to (Y-10) parts by weight of styrene or a styrene derivative, (Y-10) to 20 parts by weight of a diene monomer, 0-10 parts by weight of a polyfunctional monomer and 0-5 parts by weight of a graft crosslinking agent, wherein Y is the amount of diene monomer used in the formation of said layer (B).