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. 27, 1984
Filed:
Sep. 26, 1983
Applicant:
Inventors:
George P Speranza, Austin, TX (US);
Robert A Grigsby, Jr, Georgetown, TX (US);
Michael E Brennan, Austin, TX (US);
Assignee:
Texaco Inc., White Plains, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
521172 ; 252182 ; 521 48 ; 521173 ; 528297 ; 5283081 ; 560 93 ;
Abstract
A mixture of aromatic polyester polyols useful in preparing rigid foams is described. The polyols are made by first reacting recycled polyethylene terephthalate (PET) scrap with an alkylene glycol to form a reaction product which is then reacted with an alkylene oxide, such as propylene oxide. The resultant mixture of aromatic polyester polyols is a homogeneous liquid which does not precipitate solids upon standing, as do some prior art PET-derived polyols.