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. 07, 1978
Filed:
Mar. 12, 1973
Applicant:
Inventors:
Alfred E Borchert, Cherry Hill, NJ (US);
Charles J Kremer, Brookhaven, PA (US);
Assignee:
Atlantic Richfield Company, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 / ;
Abstract
A modified polyester polyol prepolymer having a hydroxyl functionality of between 2 and 3 is produced by reacting a cyclic nitrile carbonate such as adipodi(nitrile carbonate) with a polyester polyol having hydroxyl numbers of about 50 to about 450. The product has a viscosity preferably in the range of about 15,000 to 30,000 centipoise at about 25.degree. C. Novel urethane foams are prepared from the modified polyester polyol prepolymers by reacting the same with aromatic isocyanates to form urethane foams having improved stability to ultraviolet discoloration and improved hydrolytic stability.