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:
Jul. 04, 1978
Filed:
Jun. 07, 1976
John L Stevenson, Big Spring, TX (US);
Robert A Fuller, Big Spring, TX (US);
Cosden Technology, Inc., Big Spring, TX (US);
Abstract
A process for the preparation of high gloss, high impact vinyl aromatic hydrocarbons which process comprises (1) subjecting a solution of rubber and vinyl aromatic hydrocarbon monomer to mass polymerization conditions in the presence of a chain transfer agent for a period of 4 to 10 hours until the reaction mass reaches a viscosity of 1800 to 2000 cps., said chain transfer agent being introduced into the reaction mass in two portions, a first portion representing 50 to 90% of the total chain transfer agent to be present during the mass polymerization and being added to said solution at or before the beginning of said mass polymerization and a second portion representing 10 to 50% being added just prior to the end of said mass polymerization, (2) subjecting said reaction mass to suspension polymerization conditions and (3) recovering high impact polymeric vinyl aromatic hydrocarbons having improved high gloss characteristics.