Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1984-09-13
1985-05-28
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528283, 528302, 528305, 5283087, C08G 6304, C08G 6322
Patent
active
045201889
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.
REFERENCES:
patent: 4065439 (1977-12-01), Uno et al.
patent: 4229555 (1980-10-01), Tobias et al.
patent: 4275189 (1981-06-01), Danick et al.
patent: 4387214 (1983-06-01), Passmore et al.
patent: 4393121 (1983-07-01), Tobias et al.
Holzrichter Edward J.
Smith Marc L.
Nist Donald E.
Phynes Lucille M.
Whittaker Corporation
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