Thermosetting powder compositions based on polyesters and acryli

Details Thermosetting powder compositions based on polyesters and acryli Thermosetting powder compositions based on polyesters and acryli

1994-03-08

1995-03-14

Acquah, Samuel A.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

528272, 528296, 528302, 528303, 528306, 528307, 528308, 5283086, 528 10, 528 33, 528 34, 528 35, 528 36, 528 41, 528438, 528445, 4273722, 427386, 427421, B32B 1900, C08F 2000

Patent

active

053976410

ABSTRACT:
A thermosetting powder composition which comprises (a) a specific a carboxyl-terminated polyester and (b) a glycidyl group-containing acrylic copolymer. The carboxyl-terminated polyester (a) has an acid number of 15 to 70 mg of KOH/g and must be prepared in two steps. In the first step, a hydroxyl-terminated polyester is prepared from at least one polycarboxylic acid other than 1,4-cyclohexanedicarboxylic acid, and at least one aliphatic or cycloaliphatic polyol and in the second step, the resulting hydroxyl-terminated polyester is esterified with 1,4-cyclohexanedicarboxylic acid exclusively. In addition, the composition of the polyester (a) is very specific: it contains at least 75 mole % of terephthalic acid, at least 10 mole % of 1,4-cyclohexanedicarboxylic acid and at most 14 mole % of at least one other aromatic and/or aliphatic and/or cycloatiphatic polycarboxylic acid, based on a total carboxylic acid content of 100 mole %. The thermosetting powder compositions obtained from polyester (a) and acrylic copolymer (b) are particularly useful to prepare powder paints and varnishes; they produce coatings with a high gloss, excellent mechanical properties, and at the same time, good weatherability.

REFERENCES:
patent: 3880946 (1975-04-01), Labana et al.
patent: 4085159 (1978-04-01), Marsiat
patent: 4499239 (1985-02-01), Murakami et al.
patent: 5098953 (1992-03-01), Ohmae et al.
patent: 5153252 (1992-10-01), Skora
patent: 5326821 (1994-07-01), Sasaki et al.

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