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:
Aug. 20, 1985
Filed:
Nov. 04, 1983
Jan Tijssen, Spaubeek, NL;
Jozef L van der Loos, Sittard, NL;
Stamicarbon B.V., Geleen, NL;
Abstract
An improved process for the preparation of heat resistant copolymers of an alpha-methylstyrene and acrylonitrile by polymerization thereof in aqueous emulsion, and in the presence of a free-radical-supplying compound and a chain-transfer agent. The polymerization reaction is insufficiently cooled to remove all of the released reaction heat, and in combination therewith the polymerization is conducted at a temperature of the aqueous emulsion maintained at a level of at most 110.degree., while further maintaining the mean rate of temperature increase per hour, v, at a value of at most 60.degree. C. per hour, wherein v is determined by the formula: ##EQU1## in which: T.sub.m =maximum temperature of the aqueous emulsion (.degree.C.),