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:
Jan. 25, 1983
Filed:
Jan. 12, 1981
Paul L Heater, Massillon, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
A copolyester resin having modified carboxyl terminated ends is disclosed, as well as the method for making and using that compound with epoxide curing compounds in powder coating resins for substrates. The polymerization of the copolyester resin contains a reactor compounding stage which permits the reaction of the carboxyl termini with a curing reaction catalyst prior to any compounding or mixing of the modified copolyester resin with the epoxide curing compounds. The modification to these end groups of the copolyester resin creates activated termini which, although stable of themselves, react more rapidly, when the modified copolyester resin is compounded with the epoxide curing compounds and subsequently heated on the substrate, than with the conventional introduction of the epoxide catalyst during final compounding. Alteration of the curing parameters of the modified copolyester resin with the epoxide curing compounds imparts greater impact strength and better leveling properties at temperatures between 300.degree. F. and 450.degree. F.