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:
Jul. 13, 1993
Filed:
Dec. 12, 1990
Applicant:
Inventors:
Chung-gu Kang, Suwon, KR;
Bong-jin Kim, Seoul, KR;
Assignee:
Korea Chemical Co., Ltd., , KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525446 ; 528 25 ; 528 26 ; 528 29 ; 528 37 ;
Abstract
A process for preparing polyester resins for powder coatings by using monomers having a low glass transition temperature and silicone compounds comprises (1) condensation reacting silicone compounds with alcohols having at least two hydroxyl groups, (2) reacting resins prepared by the step (1) with acidic compounds in the presence of esterification catalysts, and (3) reacting resins prepared by step (2) with trimellitic anhydride in the presence of catalysts to form polyester resins having an acid value of 30 to 100, a low melting viscosity, a low softening point, excellent storage stability, good heat-resistance and a good appearance.