Lacquers containing highly branched copolyester polyol
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert John Barsotti, Carl Brent Douglas, Renee Jeanne Kelly, Lech Wilczek
Life of this patent
Estimating the term…
Abstract
This invention relates to rapid drying lacquers that are particularly useful for automotive OEM refinish applications. The lacquer includes a novel highly branched copolyester polyol. This invention is also directed to a process for producing coatings from the rapid drying lacquers. These lacquers are especially useful in providing for chip and humidity resistant coatings having improved adhesion.
Claims23
A lacquer comprising 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.
A lacquer comprising 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.
A lacquer comprising 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;
- 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 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.
A lacquer comprising a highly branched copolyester polyol polymerized from a monomer mixture comprising:
- (a) a molecular weight controlling agent having the formula:
- R1-Zk,
- 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;
- (b) one or more hyper branching monomers having the structural formula:
- (R2O)n—R4—[C(CO)O R3]m;
- and
- (c) 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.
Dependencies are inferred from the claim text.