Acid etch resistant coatings containing polyurethane polyols
AssigneeAkzo N.V.
InventorsJohn L. Gardon, Peter W. Uhlianuk, Scott W. Loper
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Abstract
A high solids coating composition suitable for use, for example, as a high performance automotive coating is provided, which comprises (1) a particular polyurethane polyol which is the reaction product of an asymmetric diol component and an isocyanate component, and (2) an hydroxyl groups-reactive crosslinking agent. When formulated as a one-pack coating preferably with an aminoplast crosslinking agent, these coating compositions possess a number of desirable properties including excellent acid etch resistance.
Claims29
A coating composition comprising:
- (1) a polyurethane polyol possessing a number average molecular weight in the range of from about 600 to about 3000 and a degree of dispersion in the range of from about 1.1 to about 3.5, comprising the reaction product of (A) a diol component selected from substantially monomeric, asymmetric diols wherein the hydroxyl groups are separated by 3 carbon atoms or less, and (B) an isocyanate component selected from n-functional polyisocyanates, wherein n is a number in the range of from 2 to 5;
- and
- (2) an hydroxyl groups-reactive crosslinking agent.
A coating composition comprising:
- (1) a polyurethane polyol possessing a number average molecular weight in the range of from about 600 to about 3000 and a degree of dispersion in the range of from about 1.1 to about 3.5, comprising the reaction product of (A) a diol component selected from substantially monomeric, asymmetric diols having a primary and a secondary hydroxyl group wherein the hydroxyl groups are separated by 3 carbon atoms or less, and (B) an isocyanate component selected from n-functional polyisocyanates, wherein n is a number in the range of from 2 to 5;
- and
- (2) an hydroxyl groups-reactive crosslinking agent,
- wherein the diol component of the polyurethane polyol is selected from 2-ethyl-1,3-hexane diol, 1,2-propane diol, 1,3-butane diol, 1,2-hexane diol, 1,2-octane diol, 1,2-decane diol and 2,2,4-trimethyl-1,3-pentane diol.
A coating composition comprising:
- (1) a polyurethane polyol possessing a number average molecular weight in the range of from about 600 to about 3000 and a degree of dispersion in the range of from about 1.1 to about 3.5, comprising the reaction product of
- (A) a diol component selected from substantially monomeric, asymmetric diols having from 3 to 18 total carbon atoms, wherein the hydroxyl groups are separated by 2 or 3 carbon atoms, and
- (B) an isocyanate component selected from n-functional polyisocyanates, wherein n is a number in the range of from 3 to 4;
- and
- (2) an hydroxyl group-reactive crosslinking agent selected from the group consisting of polyisocyanates and blocked polyisocyanates.
Dependencies are inferred from the claim text.