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. 06, 1977
Filed:
Jan. 26, 1976
James Leverette Guthrie, Ashton, MD (US);
Shrikant Vishwanath Dighe, Bethesda, MD (US);
W. R. Grace & Co., New York, NY (US);
Abstract
This invention is directed to thiol containing compounds having no hydrolytically sensitive groupings which are useful as polymerization transfer agents or as curing agents in curable polymer systems containing polyenes and a free radical initiator. The thiol containing compounds are formed by reacting a polyol with an allylic halide to form a poly(unsaturated ether) whose double bonds are converted to thioesters by free radical catalyzed addition of SH groups from a thiolcarboxylic acid, e.g. thioacetic acid and the like. Hydrolysis of the thioester yields the desired thiol or polythiol derivative. Alternatively the poly(unsaturated ether) is reacted with H.sub.2 S to give the desired thiol or polythiol directly in a single step. The polythiols can be chain extended by any difunctional compound that reacts with the hydroxy groups on the polythiol.