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:
Feb. 28, 1978
Filed:
Feb. 24, 1977
Otto C Elmer, Akron, OH (US);
The General Tire & Rubber Company, Akron, OH (US);
Abstract
This invention concerns a method of making a urethane-terminated polycarbodiimide and the product resulting therefrom wherein the product displays unique hydrolytic degradation stabilization properties for polyester urethane rubbers and peroxide cured hydrocarbon rubbers. The method involves reacting an arylene diisocyanate with a stoichiometric deficiency of a primary or secondary aliphatic alcohol containing no other isocyanate-reactive substituents, thereby converting less than all of the isocyanate groups to urethane groups, and thereafter admixing thereto a carbodiimide-forming catalyst to polymerize the unconverted isocyanate groups and form the urethane-terminated polycarbodiimide.