Liquid thermosetting coating compositions
AssigneeDulux Australia Ltd.
InventorDavid Vincent Gibson
Life of this patent
Estimating the term…
Abstract
A liquid thermosetting coating composition wherein the film-forming component is a blend of A. from 60-95% by weight of an acid half-ester of a carboxylic acid anhydride and a polyol, the polyol being the diester of a diepoxide of epoxide equivalent 300 maximum, an autoxidative monocarboxylic fatty acid and a monocarboxylic hydroxy-acid, the acid half-ester having no epoxide groups and on average 1.5-2.5 hydroxyl groups, 1-2 carboxyl groups and 1-2 autoxidative fatty acid residues per molecule, and B. from 5-40% of a suitable crosslinking agent. The coating compositions have low viscosities at high weight solids contents, and dried films thereof exhibit excellent mechanical properties.
Claims5
A liquid thermosetting coating composition having a weight solids content of 70% minimum characterised in that the film-forming component thereof is a blend of the following constituents;
- 1. from 60-95% by weight of an acid half-ester of a carboxylic acid anhydride and a polyol, the polyol being a di-ester of a diepoxide, an autoxidative monocarboxylic fatty acid and a monocarboxylic hydroxy-acid, further characterised in that the diepoxide has an epoxide equivalent of 300 maximum, the acid half-ester is epoxide-free and comprises on average 1.5-2.5 hydroxy groups, 1-2 carboxyl groups and 1-2 autoxidative residues of monocarboxyolic fatty acids per molecule;
- and
- 2. from 5-40% by weight of a crosslinking agent reactable with hydroxyl groups of the acid half-ester to form a crosslinked molecular net work.
Dependencies are inferred from the claim text.