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:
Nov. 28, 1989
Filed:
Sep. 30, 1988
Applicant:
Inventors:
Assignee:
Ecoplastics Limited, Ontario, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528272 ; 528302 ; 528304 ; 5283082 ; 528220 ; 523125 ;
Abstract
Condensation copolymers such as polyesters are rendered photodegradable, by subjecting them to conditions under which they undergo ester interchange effectively causing polymer chain scission, in the presence of a keto carbonyl containing compound having chemical groups reactive with the condensation polymer products formed by the ester interchange. The compound reacts chemically with the polymer products to reform the high molecular weight condensation copolymer, but with the keto carbonyl groups chemically linked into the polymer chains to confer photodegradability thereon.