Two component coating compositions containing highly branched copolyester polyol
First Claim
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1. A solvent borne coating composition comprising:
- (a) a binder component, which comprises a highly branched copolyester polyol having a number average molecular weight ranging from 1000 to 30.000, hydroxyl groups ranging from 5 to 200 per polymer chains and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyaster polyol being polymerized from a monomer mixture containing a chain extender selected from the group consisting of a hydroxy carboxylic acid, a lactone of a hydroxy carboxytic acid and a combination thereof; and
one or more hyper branching monomers, said hyper branching monomer having one carboxyl group and two hydroxyl groups, two carboxyl groups and one hydroxyl group, one carboxyl group and three hydroxyl groups, or three carboxyl groups and one hydroxyl group, and wherein the weight ratio of the hyper branching monomer to the chain extender in said monomer mixture ranges from 1/0.3 to 1/20; and
(b) a crosslinking component selected from the group consisting of a polyisocyanate having at least two reactive isocyanate groups, a melamine and a combination thereof.
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Abstract
This invention relates to rapid curing coating compositions that are particularly useful for automotive OEM and refinish applications. The coating composition includes a binder component that contains a novel highly branched copolyester polyol, and a crosslinking component that contains conventional crosslinking agents, such as polyisocyanate and melamine. This invention is also directed to a process for producing coatings from the rapid curing coating compositions. These compositions are especially useful in providing for mar resistant and flexible coatings.
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Citations
26 Claims
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1. A solvent borne coating composition comprising:
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(a) a binder component, which comprises a highly branched copolyester polyol having a number average molecular weight ranging from 1000 to 30.000, hydroxyl groups ranging from 5 to 200 per polymer chains and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyaster polyol being polymerized from a monomer mixture containing a chain extender selected from the group consisting of a hydroxy carboxylic acid, a lactone of a hydroxy carboxytic acid and a combination thereof; and
one or more hyper branching monomers, said hyper branching monomer having one carboxyl group and two hydroxyl groups, two carboxyl groups and one hydroxyl group, one carboxyl group and three hydroxyl groups, or three carboxyl groups and one hydroxyl group, and wherein the weight ratio of the hyper branching monomer to the chain extender in said monomer mixture ranges from 1/0.3 to 1/20; and(b) a crosslinking component selected from the group consisting of a polyisocyanate having at least two reactive isocyanate groups, a melamine and a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A solvent borne coating composition comprising:
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(a) a binder component, which comprises a highly branched copolyester polyol polymerized from a monomer mixture comprising; one or more hyper branching monomers having the structural formula;
(R2O)n—
R4—
[C(CO)O R3]m; anda chain extender selected from the group consisting of a hydroxy carboxylic acid, an ester of a hydroxy carboxylic acid and a combination thereof, said hydroxy carboxylic acid having the structural formula;
R5O—
R6—
C(O)O R7,wherein; R2 and R5 are H or (O)C R8, R3 and R7 are H, C1-12 hydrocarbyl radical or hydroxyl substituted 1-12 hydrocarbyl radical, R4 is C1-12 hydrocarbyl radical having m+n free valencies, R6 is C1-12 hydrocarbyl radical with two free valencies, R8 is H or C1-200 hydrocarbyl radical and n+m ranges from 3 to 6, and provided norm is 1; and (b) a crosslinking component selected from the group consisting of a polyisocyanate having at least two reactive isocyanate groups, a melamine and a combination thereof. - View Dependent Claims (25)
wherein; R1 is C1-200 hydrocarbyl radical with free valencies ranging from 1 to 6 Z is a hydroxyl, carboxyl, amine or epoxy group, and k ranges from 1 to 6.
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26. A highly branched copolyester polyol polymerized from a monomer mixture comprising:
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one or more hyper branching monomers having the structural formula;
(R2O)n—
R4—
[C(CO)O R3]m;a chain extender selected from the group consisting of a hydroxy carboxylic acid, an ester of a hydroxy carboxylic acid and a combination thereof, said hydroxy carboxylic acid having the structural formula;
R5O—
R6—
C(O)O R7,wherein;
R2 and R5 are H or(O)C R8,
R3 and R7 are H, C1-12 hydrocarbyl radical or hydroxyl substituted C1-12 hydrocarbyl radical,
R4 is C1-12 hydrocarbyl radical having m+n free valencies,
R6 is C1-12 hydrocarbyl radical with two free valencies,
R8 is H or C1-200 hydrocarbyl radical and n+m ranges from 3 to 6, end provided n or m is 1; anda molecular weight controlling agent having the formula;
R1—
Zk,wherein; R1 is C1-200 hyrocarbyl radical with free valencies in from 1 to 6 Z is a hydroxyl, carboyl, amine or epoxy group, and k ranges from 1 to 6.
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Specification