Linear polyester coil coating compositions
AssigneeMobil Oil Corporation
InventorsMichael A. Tobias, Conrad L. Lynch
Life of this patent
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Abstract
Linear thermosettable polyester resin compositions are prepared from benzenedicarboxylic acid, an alkyl dicarboxylic acid, (e.g. 1,6-hexanedioic acid), and a short chain alkylene diol component (e.g. 2,2-dimethyl-1,3-propanediol), the resin having a number average molecular weight of about 1,500 to about 5,000 and combined acid and hydroxyl values of about 20 to about 60 mg of KOH per gram of polyester. When these polyesters are combined with an aminoplast and an acid catalyst they form coating compositions which, when applied to a substrate and cured, provide a coating having an outstanding combination of hardness, adhesion, extendability, flexibility and dry heat resistance.
Claims15
A linear thermosettable polyester resin derived from a reaction mixture comprising:
- (a) between about 38 and 43 percent by weight of a short chain alkylene diol component;
- (b) between about 11 and about 17 percent by weight of an alkyl dicarboxylic acid having 4 to 7 carbon atoms in the primary carbon chain between the two carboxylic acid groups;
- (c) between about 40 and 47 percent by weight of a benzenedicarboxylic acid component;
- and
- (d) said polyester resin having a number average molecular weight of from about 1,500 to about 5,000 and a combined acid and hydroxyl number of about 20 to about 60 milligrams of KOH per gram of polyester.
Dependencies are inferred from the claim text.