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:
Mar. 09, 1999
Filed:
Mar. 26, 1997
Masayuki Fujita, Chiba, JP;
Takahiro Ishii, Chiba, JP;
Sumitomo Chemical Company, Ltd., Osaka, JP;
Abstract
There is provided a process for producing a styrene based polymer by polymerizing a styrene compound, the process including the step of continuously feeding a styrene compound and one or more sulfide compounds to a reaction zone. The sulfide compounds include dithiocarbamate group-containing sulfide compounds, aryl or arylalkyl group-containing sulfide compounds and thiazole group-containing sulfide compounds. The polymerization is carried out under stirring conditions to maintain the composition of the reaction mixture in the reaction zone uniform and at a predetermined conversion within a range of from 40 to 80% by weight. Polymerization reaction mixture is continuously removed from the reaction zone. The styrene based polymer produced is narrow in molecular weight distribution, and excellent in flowability, mechanical strength and heat resistance.