Polyester containing tertiary carboxyl groups, preparation...

C - Chemistry – Metallurgy – 08 – G

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Details

C08G 63/60 (2006.01) C08G 63/16 (2006.01) C09D 167/02 (2006.01)

Patent

CA 2320344

The invention concerns a polyester bearing tertiary carboxyl groups, characterised in that it consists of: (a) 8.1 to 35 moles of an aliphatic or cycloaliphatic of a polyol; (b) 9.1 to 36 moles of an aliphatic, cycloaliphatic or aromatic polycarboxylic acid; (c) 1.6 to 2.8 moles of an aliphatic, cycloaliphatic or aromatic compound comprising a tertiary carboxyl group and either a primary or secondary carboxyl group, or a primary or secondary hydroxyl group. Said polyester is prepared in several steps, the first steps consisting in the preparation of a polyester by condensation between (a) an aliphatic or cycloaliphatic polyol, and (b) an aliphatic, cycloaliphatic or aromatic polycarboxylic acid, the final step consisting in condensing said polyester with (c) an aliphatic, cycloaliphatic or aromatic compound comprising a tertiary carboxyl group and either a primary or secondary carboxyl group, or a primary or secondary hydroxyl group. Said polyester is used in thermosetting powder compositions, mixed with a crosslinking agent which is more particularly a .beta.-hydroxylalkylamide. Said compositions provide coatings with excellent surface appearance, good flexibility and good resistance to poor weather conditions.

La présente invention concerne un polyester porteur de groupes carboxyle tertiaires, caractérisé en ce qu'il est constitué de: (a) 8,1 à 35 moles d'un polyol aliphatique ou cycloaliphatique; (b) 9,1 à 36 moles d'un acide polycarboxylique aliphatique, cycloaliphatique ou aromatique; (c) 1,6 à 2,8 moles d'un composé aliphatique, cycloaliphatique ou aromatique comportant, d'une part, un groupe carboxyle tertiaire, et, d'autre part, soit un groupe carboxyle primaire ou secondaire, soit un groupe hydroxyle primaire ou secondaire. Le polyester de l'invention est préparé en plusieurs étapes, les premières étapes consistant en la préparation d'un prépolyester par condensation entre (a) un polyol aliphatique ou cycloaliphatique, et (b) un acide polycarboxylique aliphatique, cycloaliphatique ou aromatique, la dernière étape consistant à condenser ce prépolyester avec (c) un composé aliphatique, cycloaliphatique ou aromatique comportant, d'une part, un groupe carboxyle tertiaire, et, d'autre part, soit un groupe carboxyle primaire ou secondaire, soit un groupe hydroxyle, primaire ou secondaire. Ce polyester est utilisé dans des compositions thermodurcissables en poudre, en mélange avec un agent de réticulation qui est plus particulièrement un bêta-hydroxyalkylamide. Ces compositions fournissent des revêtements qui présentent un excellent aspect de surface, une bonne flexibilité et une bonne résistance aux intempéries.

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