Polyesters
AssigneeInternationale Octrooi Maatschappij "Octropa" B.V.
InventorsRobert van der Linde, Gerardus F. Meijerink, Johan Rietberg
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Abstract
The invention provides novel polyesters based on 100- 75 equivalent percent of a phthalic acid, 0- 25 equivalent percent of an aliphatic dicarboxylic acid and 150- 225 equivalent percent of a C.sub.5 - C.sub.12 diol. The polyesters can be admixed with amino resins and an acid catalyst to form a coating composition which can be stoved into a hard tough coating.
Claims7
A method for preparing a polyester having an acid value below 15 and a hydroxyl value of 130-400, comprising heating and reacting a mixture consisting essentially of 75-100 equivalent percent of a phthalic acid, 0-25 equivalent percent of an aliphatic dicarboxylic acid containing 4-40 carbon atoms and 150-225 equivalent percent based on total carboxylic acid equivalents of an aliphtic diol containing 5-12 carbon atoms in the molecule.
A polyester composition consisting essentially of 75-100 equivalent percent of radicals derived from a phthalic acid, 0-25 equivalent percent of an aliphatic dicarboxylic acid containing 4-40 carbon atoms and 150-225 equivalent percent based on the total carboxylic acid equivalents of an aliphatic diol containing 5-12 carbon atoms in the molecule, the polyester having an acid value below 15 and a hydroxyl value of 130-400.
Dependencies are inferred from the claim text.