Alkyd resins and the use thereof for high solids coatings
AssigneeThe Sherwin-Williams Company
InventorMadhukar Rao
Life of this patent
Estimating the term…
Abstract
This invention relates to fatty acid modified alkyd resins and the use thereof in formulation of high solids interior and exterior paints capable of curing at ambient temperatures without the use of appreciable amounts of solvent. More specifically, the invention relates to high solids alkyd coatings derived from fatty acid oil modified alkyd resins having low viscosities capable of forming finishes that have good physical characteristics such as high gloss, resistance to humidity, excellent adhesion and a good hardness. These oil modified alkyd resins have number average molecular weights of less than about 6,000 and are derived from the polymerization of drying oil fatty acids, dibasic aromatic acids, polyols, at least one unsaturated monocarboxylic acid and an unsaturated monohydric alcohol.
Claims16
An air-drying high solids modified alkyd resin having a number average molecular weight of less than about 6,000 consisting essentially of the condensation polymerization product of:
- (a) from about 45 to 70 parts by weight of at least one drying oil fatty acid comprising at least 52% by weight of linoleic acid and/or linolenic acid,
- (b) from about 4 to 15 parts by weight of at least one dibasic aromatic acid or anhydride,
- (c) from about 10 to 28 parts by weight of at least one polyol selected from the group consisting of pentaerythritol, dipentaerythritol and mixtures thereof,
- (d) from about 4 to 15 parts by weight of at least one unsaturated monocarboxylic acid, and
- (e) from about 4 to 10 parts by weight of an unsaturated monohydric alcohol.
A process of preparing an air drying high solids modified alkyd resin having a number average molecular weight of less than about 6,000 and consisting essentially of the condensation polymerization product at temperatures ranging up to about 475.degree. F. of
- (a) from about 45 to 70 parts by weight of at least one drying oil fatty acid comprising at least 52% by weight of linoleic and/or linolenic acid,
- (b) from about 4 to 15 parts by weight of at least one dibasic aromatic acid or anhydride,
- (c) from about 10 to 28 parts by weight of at least one polyol selected from the group consisting of pentaerythritol, dipentaerythritol and mixtures thereof,
- (d) from about 4 to 15 parts by weight of at least one unsaturated monocarboxylic acid,
- (e) from about 4 to 10 parts by weight of an unsaturated monohydric alcohol.
An air drying high solids alkyd coating comprising about 20 to 60 parts by weight of a fatty acid modified alkyd resin, 5 to 20 parts by weight of an organic solvent, 15 to 40 parts by weight of an inorganic pigment, 0 to 30 parts by weight of an inorganic extender, and up to 10 parts by weight of a drier consisting essentially of a metal drier selected from the group consisting of salts of cobalt, copper, lead, zirconium, calcium, nickel, zinc, tin, iron, and mixtures thereof;
- said alkyd resin having a number average molecular weight of less than about 6,000 and consisting essentially of the condensation polymerization product of:
- (a) from about 45 to 70 parts by weight of at least one drying oil fatty acid comprising at least 52% by weight of linoleic and/or linolenic acid,
- (b) from about 4 to 15 parts by weight of at least one dibasic aromatic acid or anhydride,
- (c) from about 10 to 28 parts by weight of at least one polyol selected from the group consisting of pentaerythritol, dipentaerythritol and mixtures thereof,
- (d) from about 4 to 15 parts by weight of at least one unsaturated monocarboxylic acid, and
- (e) from about 4 to 10 parts by weight of an unsaturated monohydric alcohol.
Dependencies are inferred from the claim text.