Two component coating compositions containing highly branched copolyester polyol
First Claim
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1. A 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copofyester 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 carboxylic 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, wherein ratio of said isocyanate groups on said polyisocyanate in said crosslinking component to said hydroxyl groups on said highly branched copolyester polyol ranges from 0.25/1 to 3/1 and amount of said melamine in said crosslinking component ranges from 10 weight percent to 40 weight percent, based on the total of said binder and crosslinking components.
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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.
35 Citations
36 Claims
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1. A 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copofyester 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 carboxylic 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, wherein ratio of said isocyanate groups on said polyisocyanate in said crosslinking component to said hydroxyl groups on said highly branched copolyester polyol ranges from 0.25/1 to 3/1 and amount of said melamine in said crosslinking component ranges from 10 weight percent to 40 weight percent, based on the total of said binder and crosslinking components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A process for producing a coating on the surface of a substrate, said process comprising:
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mixing binder and crosslinking components of a coating composition to form a potmix, wherein said binder component 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyester 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 carboxylic 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; andsaid crosslinking component selected from the group consisting of a polyisocyanate having at least two reactive isocyanate groups, a melamine and a combination thereof; applying a layer of said pot mix on said surface; and curing said layer to form said coating on said surface of said substrate. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A coating composition comprising:
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(a) a binder component, which comprises; (I) aldimine, ketimine, polyaspartic ester, or a combination thereof; and (II) 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyester 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 carboxylic 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 (32)
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33. A 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyester polyol being polymerized from a monomer mixture containing; (I) a chain extender selected from the group consisting of a hydroxy carboxylic acid, a lactone of a hydroxy carboxylic acid and a combination thereof; (II) 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 (III) a molecular weight controlling agent having in the range of 1 to 6 functionalities selected from the group consisting of hydroxyl, amine, epoxide, carboxyl and a combination thereof, 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 wherein; 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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34. A 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 chain and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyester polyol being polymerized from a monomer mixture comprising; (I) a chain extender selected from the group consisting of dimethylol propionic acid, a caprolactone and a combination thereof; (II) 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 (III) pentaerythritol, 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 wherein; 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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35. A 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; and
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, and provided n or m 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, wherein ratio of said isocyanate groups on said polyisocyanate in said crosslinking component to said hydroxyl groups on said highly branched copolyester polyol ranges from 0.25/1 to 3/1 and amount of said melamine in said crosslinking component ranges from 10 weight percent to 40 weight percent, based on the total of said binder and crosslinking components. - View Dependent Claims (36)
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Specification