Polyester powder coating composition

Claim 2

A POLYESTER POWDER COATING COMPOSITION COMPRISING

Claim 3

A POLYESTER WHICH IS PREPARED BY REACTING A. AN AROMATIC DICARBOXYLIC ACID OR ITS LOWER ALKYL ESTER, B. AN ALIPHATIC OR ALICYCLIC DIOL, AND C. AT LEAST ONE OF THE ACIDS SELECTED FROM THE GROUP CONSISTING OF I. AN ORGANIC ACID HAVING AT LEAST THREE CARBOXY GROUPS IN THE MOLECULE OR ITS FUNCTIONAL DERIVATIVE, II. A HYDROXYALIPHATIC CARBOXYLIC ACID; III. AN ALIPHATIC DICARBOXYLIC ACID;

Claim 4

A POLYESTER WHICH IS PREPARED BY REACTING A. AN AROMATIC DICARBOXYLIC ACID OR ITS LOWER ALKYL ESTER, B. AN ALIPHATIC OR ALICYCLIC DIOL, AND C. AT LEAST ONE OF THE ACIDS SELECTED FROM THE GROUP CONSISTING OF I. AN ORGANIC ACID HAVING AT LEAST THREE CARBOXY GROUPS IN THE MOLECULE OR ITS FUNCTIONAL DERIVATIVE, II. A HYDROXYALIPHATIC CARBOXYLIC ACID; III. AN ALIPHATIC DICARBOXYLIC ACID;

Claim 5

AN ORGANIC ACID ANHYDRIDE HAVING AT LEAST TWO ACID ANHYDRIDE GROUPS IN THE MOLECULE; AND

Claim 6

AN ORGANIC ACID ANHYDRIDE HAVING AT LEAST TWO ACID ANHYDRIDE GROUPS IN THE MOLECULE; AND

Claim 7

The polyester powder coating commposition according to claim 1, wherein the proportions of the components are in a range of 5 to 15 parts by weight of the organic polyanhydride (2) and in a range of 0.1 to 1 part by weight of the polyacrylic acid ester (3) on the basis of 100 parts by weight of the polyester (1).

Claim 8

an organic acid anhydride having at least two acid anhydride groups in the molecule; and

Claim 9

an organic acid anhydride having at least two acid anhydride groups in the molecule; and

Claim 10

a polyacrylic acid ester.

Claim 11

a polyacrylic acid ester.

Claim 12

The polyester powder coating composition according to claim 1, wherein the proportion of the aromatic dicarboxylic acid or its lower alkyl ester (a) to the acid components (c) in the polyester (1) is in a range of 70/30 to 98/2 and the molar ratio of the total acid/total diol is in a range of 1/1.1 to 1/2.0.

Claim 13

A POLYACRYLIC ACID ESTER.

Claim 14

A POLYACRYLIC ACID ESTER.

Claim 15

The polyester powder coating composition according to claim 1, wherein the aromatic dicarboxylic acid or its lower alkyl ester is a member selected from the group consisting of terephthalic acid, isophthalic acid, orthophthalic acid and the ester of a lower alkyl selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, sec-butyl and tert-butyl; the aliphatic or alicyclic diol is a member selected from the group consisting of ethyleneglycol, propyleneglycol, trimethyleneglycol, butanediol, pentanediol, hexanediol, diethyleneglycol, dipropyleneglycol, neopentylglycol, cyclohexanediol, cyclopentanediol and cyclohexanedimethanol; the organic acid having at least three carboxy groups in the molecule or its functional derivative is a member selected from the group consisting of trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic dianhydride, propane-1,2,3-tricarboxylic acid and butane-1,2,3,4-tetracarboxylic acid; the hydroxyaliphatic carboxylic acid is a member selected from the group consisting of lactic acid, glyceric acid, malic acid, tartaric acid and citric acid; and the aliphatic dicarboxylic acid is a member selected from the group consisting of oxalic acid, succinic acid, adipic acid, azelaic acid and sebacic acid.

Claim 16

The polyester powder coating composition according to claim 1, wherein the organiC acid anhydride having at least two acid anhydride groups in the molecule is a member selected from the group consisting of pyromellitic dianhydride, 2,3,6,7-nephthalenetetracarboxylic dianhydride, 3,3'',4,4''-diphenyltetracarboxylic dianhydride, 2,2'',3,3''-diphenyltetracarboxylic dianhydride, 1,2,5,6-naphthalenetetracarboxylic dianhydride, 2,2-bis(3,4-dicarboxyphenyl)propane dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl)ether dianhydride, 3,4,9,10-perylenetetracarboxylic dianhydride, ethylene bis-(trimellitate) dianhydride, hydroquinone bis(trimellitate) dianhydride, bisphenol A bis(trimellitate) dianhydride, p,p''-phenylene bis(thiotrimellitate) dianhydride, glycerine tris(trimellitate) trianhydride, and trimethylolethane trimellitate trianhydride.

Claim 17

The polyester powder coating composition according to claim 1, wherein the polyacrylic acid ester is a member selected from the group consisting of poly(methyl acrylate), poly(ethyl acrylate), poly(butyl acrylate), poly(2-ethylhexyl acrylate), poly(methoxyethyl acrylate) and poly(lauryl acrylate).

Claim 18

The polyester powder coating composition according to claim 1, which additionally comprises a sulfur-containing compound selected from the group consisting of sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, sodium diethyldithiocarbamate, zinc diethyldithiocarbamate, sodium dibutyldithiocarbamate, zinc dibutyldithiocarbamate, calcium dibutyldithiocarbamate, magnesium dibutyldithiocarbamate, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, 2-mercaptobenzimidazole, 2-mercaptobenzimidazole sodium, zinc or calcium salt, 2-mercaptoimidazoline, 2-mercaptoimidazoline sodium, zinc or calcium salt, tetramethylthiourea, dibenzylthiourea, dicyclohexylthiourea, di-o-tolylthiourea and ethylenethiourea.

Claim 19

The polyester powder coating composition according to claim 7, wherein the sulfur-containing compound is added in a range of 0.1 to 1 part by weight on the basis of 100 parts by weight of the polyester.