Thermosetting coating compositions

Claim 2

A curable polyester having a number average molecular weight of about 800 to about 6,000 and a weight average molecular weight of about 3,000 to about 40,000, comprising (a) about 20 to about 60 mol % of diol residues, based on the total moles of components (a), (b), (c), (d), (e) and (f);

Claim 3

(b) 3.5 to about 20 mol % of polyol residues, based on the total moles of components (a), (b), (c), (d), (e) and (f); wherein said polyol residues are selected from the group consisting of trimethylolpropane, trimethylolethane, glycerol, 2,2-bis(hydroxymethyl)-1,3-propanediol, 1,2,3,4,5,6-hexahydroxyhexane, and bis(2,2-bis(hydroxymethyl)-3-propanol ether; (c) about 5 to about 40 mol % of hydroxy functionalized isophthalic acid residues, based on the total moles of (a), (b), (c), (d), (e) and (f); said hydroxy functionalized residues having the formula ##STR7## wherein X is selected from --O--, --S--, --SO 2 -- or --O--(CH 2 --) n wherein n is 1 to about 6; R is a phenyl radical containing 1-3 hydroxy groups with the proviso that when X is --O-- or --S--, that R may also be hydrogen; (d) about 10 to about 40 mol % of diacid residues, derived from an aromatic diacid or a cycloaliphatic diacid or a mixture thereof, based on the total moles of (a), (b), (c), (d), (e) and (f); (e) about 0 to about 40 mol % of diacid residues derived from an aliphatic diacid based on the total moles of components (a), (b), (c), (d), (e) and (f); (f) 0 to about 10 mol % of residues derived from trimellitic acid or trimellitic anhydride, based on the total moles of components (a), (b), (c), (d), (e) and (f).

Claim 4

(b) 3.5 to about 20 mol % of polyol residues, based on the total moles of components (a), (b), (c), (d), (e) and (f); wherein said polyol residues are selected from the group consisting of trimethylolpropane, trimethylolethane, glycerol, 2,2-bis(hydroxymethyl)-1,3-propanediol, 1,2,3,4,5,6-hexahydroxyhexane, and bis(2,2-bis(hydroxymethyl)-3-propanol ether; (c) about 5 to about 40 mol % of hydroxy functionalized isophthalic acid residues, based on the total moles of (a), (b), (c), (d), (e) and (f); said hydroxy functionalized residues having the formula ##STR7## wherein X is selected from --O--, --S--, --SO 2 -- or --O--(CH 2 --) n wherein n is 1 to about 6; R is a phenyl radical containing 1-3 hydroxy groups with the proviso that when X is --O-- or --S--, that R may also be hydrogen; (d) about 10 to about 40 mol % of diacid residues, derived from an aromatic diacid or a cycloaliphatic diacid or a mixture thereof, based on the total moles of (a), (b), (c), (d), (e) and (f); (e) about 0 to about 40 mol % of diacid residues derived from an aliphatic diacid based on the total moles of components (a), (b), (c), (d), (e) and (f); (f) 0 to about 10 mol % of residues derived from trimellitic acid or trimellitic anhydride, based on the total moles of components (a), (b), (c), (d), (e) and (f).

Claim 5

The curable polyester of claim 1, wherein the component (a) diol residues are selected from the group consisting of ethylene glycol; propylene glycol; 1,3-propanediol; 2,4-dimethyl-2-ethyl-hexane-1,3-diol; 2,2-dimethyl-1,3-propanediol; 2-ethyl-2-butyl-1,3-propanediol; 2-ethyl-2-isobutyl-1,3-propanediol; 1,3-butanediol; 1,4-butanediol; 1,5-pentanediol, 1,6-hexanediol; 2,2,4-trimethyl-1,3-pentanediol; thiodiethanol; 1,2-cyclohexanedimethanol; 1,3-cyclohexanedimethanol; 1,4-cyclohexanedimethanol; 2,2,4,4-tetramethyl-1,3-cyclobutanediol; p-xylylenediol; diethylene glycol, triethylene glycol; tetraethylene glycol; and pentaethylene, hexaethylene, heptaethylene, octaethylene, monaethylene, and decaethylene glycols.

Claim 6

The curable polyester of claim 1, wherein the component (c) hydroxy functionalized isophthalic acid residues are selected from the group consisting of ##STR8##

Claim 7

The curable polyester of claim 1, wherein component (c) is comprised of residues of 5-hydroxyisophthalic acid.

Claim 8

The curable polyester of claim 1, wherein the component (d) diacid residues are selected from the group consisting of residues of isophthalic, phthalic, terephthalic, diphenic, 4,4'-oxydibenzoic, 4,4'-sulfonyldibenzoic, 4,4'-biphenyldicarboxylic, naphthalenedicarboxylic, 1,2-cyclohexane dicarboxylic, 1,3-cyclohexane dicarboxylic, 1,4-cyclohexane dicarboxylic, and 1,4-cyclopentane dicarboxylic acids.

Claim 9

The curable polyester of claim 1, wherein the component (e) aliphatic diacid residues are selected from the group consisting of oxalic, malonic, dimethylmalonic, succinic, glutaric, adipic, trimethyladipic, pimelic, 2,2-dimethylglutaric, azelaic sebacic, fumaric, maleic, and itaconic acids.