Thermosetting powder coating compositions
AssigneeEastman Kodak Company
InventorsWillis C. Wooten, Winston J. Jackson, Jr., Herbert F. Kuhfuss
Life of this patent
Estimating the term…
Abstract
Disclosed are crystalline polyesters having low melt viscosities and thermosetting compositions comprising these polyesters. The compositions are especially useful as powder coatings. The polyesters are derived from 1,4-butanediol and trans-1,4-cyclohexanedicarboxylic acid. The polyesters are characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3500 cps at 160.degree. C. and a hydroxyl number of about 35-160. The thermosetting composition contains a curing agent which is reactive with the hydroxyl groups to crosslink the polyester.
Claims12
A linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 50 mole percent of the acid moeity being of trans-1,4-cyclohexanedicarboxylic acid and 0-50 mole percent being of terephthalic acid, and the dihydric alcohol moieties consisting essentially of 1,4-butanediol, said polyester being further characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3500 cps at 160.degree. C. and a hydroxyl number of about 35-160.
A thermosetting composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 50 mole percent of the acid moiety being trans-1,4-cyclohexanedicarboxylic acid and the dihydric alcohol consisting essentially of 1,4-butanediol, said polyester being further characterized as having a molecular weight of about 700-3000 cps at 160.degree. C. and a hydroxyl number of about 35-160, and
- (b) a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
A thermosetting composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 50 mole percent of the acid moiety being trans-1,4-cyclohexanedicarboxylic acid and the dihydric alcohol consisting essentially of 1,4-butanediol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160.degree. C. and a hydroxyl number of about 50-125, and
- (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
A thermosetting powder composition comprising
- (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 50 mole percent of the acid moiety being trans-1,4-cyclohexanedicarboxylic acid and the dihydric alcohol consisting essentially of 1,4-butanediol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160.degree. C. and a hydroxyl number of about 50-125,
- (b) from about 10 to about 40%, based on the weight of said polyester of a curing agent which is reactive with hydroxyl groups to crosslink said polyester, and
- (c) a catalyzing amount of an acid catalyst.
Dependencies are inferred from the claim text.