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. 07, 1999
Filed:
Jan. 14, 1999
Applicant:
Inventors:
Hildeberto Nava, Cary, NC (US);
Karin F Nelson-Baron, Durham, NC (US);
Assignee:
Reichhold, Inc., Research Triangle Park, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528275 ; 528 89 ; 528 92 ; 528 93 ; 528 95 ; 528272 ; 528275 ; 528290 ; 528302 ; 528303 ; 528307 ; 528308 ; 5283086 ; 528373 ; 528376 ; 528391 ; 528287 ; 525437 ; 524706 ; 524709 ; 524710 ; 524714 ; 524779 ;
Abstract
A method for making a polyester resin comprises reacting a first polyfunctional alcohol or polyfunctional thiol and a carbonate in the presence of a catalyst to form an alkoxylated intermediate. The catalyst comprises: (1) a metal, a salt of a metal, or mixtures thereof and (2) a quaternary ammonium salt, a tertiary amine, an imidazole, or mixtures thereof. The alkoxylated intermediate is then reacted with a polyfunctional organic acid or anhydride thereof to form the polyester resin.