A COATING COMPOSITION
An auto-oxidisable coating composition comprising: (a) a modified alkyd resin, wherein the modified alkyd resin comprises the reaction product of reactants comprising: i. a polybasic acid or anhydride thereof; ii. a polyhydric alcohol; iii. an unsaturated fatty acid or oil; and iv. an unsaturated conjugated monocarboxylic acid having up to 10 carbon atoms; and (b) a primary drying agent comprising a metal selected from the group comprising manganese, vanadium and iron, and mixtures thereof, wherein the primary drying agent is substantially free of cobalt.
1 . An auto-oxidisable coating composition comprising:
(a) a modified alkyd resin, wherein the modified alkyd resin comprises the reaction product of reactants comprising:
i. a polybasic acid or anhydride thereof;
ii. a polyhydric alcohol;
iii. an unsaturated fatty acid or oil; and
iv. an unsaturated conjugated monocarboxylic acid having up to 10 carbon atoms;
and
(b) a primary drying agent comprising a metal selected from the group comprising manganese, vanadium and iron, and mixtures thereof, wherein the primary drying agent is substantially free of cobalt.
2 . The coating composition according to claim 1 , wherein the polybasic acid or anhydride thereof is selected from the group comprising phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic anhydride, succinic acid, 1,4-cyclohexane dicarboxylic acid, trimellitic anhydride, and mixtures thereof, such as wherein the polybasic acid or anhydride comprises phthalic anhydride, and mixtures thereof.
3 . The coating composition according to claim 1 , wherein the polybasic acid or anhydride comprises phthalic anhydride.
4 . The coating composition according to claim 1 , wherein the polyhydric alcohol is selected from the group comprising pentaerythritol, dipentaerythritol, glycerol, and mixtures thereof.
5 . The coating composition according to claim 1 , wherein the polyhydric alcohol comprises pentaerythritol.
6 . The coating composition according to claim 1 , wherein the unsaturated fatty acid or oil is selected from the group comprising tall oil fatty acid; fatty acids derived from safflower oil, linseed oil, soya bean oil, safflower oil, tung oil, sunflower oil, rapeseed oil, dehydrated castor oil, peanut oil, sardine oil, herring oil, tallow oil and cottonseed oil; oil derived from tall oil fatty acid, safflower oil, linseed oil, soya bean oil, safflower oil, tung oil, sunflower oil, rapeseed oil, dehydrated castor oil, peanut oil, sardine oil, herring oil, tallow oil and cottonseed oil; and mixtures thereof.
7 . The coating composition according to claim 1 , wherein the modified alkyd resin comprises less than 10% by weight, of the unsaturated conjugated monocarboxylic acid.
8 . The coating composition according to claim 1 , wherein the modified alkyd resin comprises less than 7% by weight, of the unsaturated conjugated monocarboxylic acid.
9 . The coating composition according to claim 1 , wherein the unsaturated conjugated monocarboxylic acid is an aliphatic unsaturated conjugated monocarboxylic acid.
10 . The coating composition according to claim 1 , wherein the unsaturated conjugated monocarboxylic acid is of the formula R—CO 2 H, wherein R represents a C 4 -C 9 alkenyl group comprising two conjugated double bonds.
11 . The coating composition according to claim 1 , wherein the unsaturated conjugated monocarboxylic acid is selected from the group comprising 2,4-hexadienoic acid, 2,4-pentadienoic acid, 2,4-heptadienoic acid, 3,5 heptadienoic acid, 2,4-octadienoic acid, 3,5-octadienoic acid, 2,4-nonadienoic acid, 8-methyl-4,6-nonadienoic acid, and mixtures thereof.
12 . The coating composition according to claim 1 , wherein the unsaturated conjugated monocarboxylic acid comprises 2,4-hexadienoic acid.
13 . The coating composition according to claim 1 , wherein the primary drying agent further comprises a nitrogen donor ligand selected from the group comprising monodentate, bidentate, tridentate, tetradentate, pentadentate and hexadentate nitrogen donor ligands.
14 . The coating composition according to claim 1 , further comprising a secondary drying agent comprising a metal salt of an organic acid wherein the metal is selected from the group comprising zirconium, strontium, zinc, aluminium, bismuth, neodymium, lanthanum, calcium, lithium, barium and potassium.
15 . The coating composition according to claim 1 , further comprising an aliphatic solvent.
16 . The coating composition according to claim 1 , wherein the composition is formulated as a one component composition.
17 . A paint, varnish, lacquer, stain, enamel or printing ink comprising a coating composition according to claim 1 .
18 . A substrate coated on at least a portion thereof with a coating composition according to claim 1 .
19 . A method of coating at least a portion of a substrate comprising applying thereto a coating composition according to claim 1 .
15 . (canceled)