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:
May. 28, 1985
Filed:
Sep. 13, 1984
Edward J Holzrichter, Redlands, CA (US);
Marc L Smith, Highland, CA (US);
Whittaker Corporation, Los Angeles, CA (US);
Abstract
The improved composition comprises: about 43-31 mole % of neopentyl glycol; about 10-21 mole % of 1,4-cyclohexanedimethanol; about 10-21 mole % of aliphatic dicarboxylic acid selected from the group consisting of adipic acid, sebacic acid, azelaic acid, 1,12-dodecanedioic acid and mixtures thereof; about 22-16 mole % of aromatic acid selected from the group consisting of orthophthalic acid, isophthalic acid and mixture thereof; about 15-11 mole % of terephthalic acid; and, sufficient condensation catalyst to effect substantial esterification and polymerization of said composition at elevated temperature. The catalyst may be, for example, dibutyl tin oxide. The mole ratio of alcohol to acid is about 1.08-1, 13:1. The polyester resin is provided by reacting the components of the composition at a temperature of, for example, 470.degree. F. for a time sufficient to complete the reaction, the resin having an average molecular weight of at least about 5000 and preferably about 5000-7000. The resin is then cooled, diluted with hydrocarbon solvent and reacted with melamine resin or the like in the presence of a cross-linking agent to provide an improved coil coating. The coil coating when cured as a film on a coil substrate exhibits superior hardness, bend flexibility and resistance to solvent degradation. The liquid coating also resists crystallization in storage and the polyester resin thereof is more readily soluble in common organic solvents.