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US 5,393,840 AGranted
Thermosetting coating compositions
AssigneeEastman Chemical Company
InventorThauming Kuo
Life of this patent
Estimating the term…
Abstract
This invention is directed to thermosetting coating compositions comprising blends of phenol-functional polyesters and hydroxyl-functional acrylic copolymers. The resin blends are formulated with an amino crosslinker to form industrial baking enamels. Coatings thus obtained exhibit improved acid-etch resistance over those based on hydroxyl-functional acrylic resins and have a good combination of hardness and impact resistance. These coatings are particularly useful as automotive coatings.
Claims37
A thermosetting coating-composition comprising
- (I) about 5 to about 81 weight percent of a curable polyester having a number average molecular weight of about 800 to about 3500 and a weight average molecular weight of about 3000 to about 70,000, comprising
- (a) about 35 to 45 mole percent of diol residues,
- (b) about 4 to about 8 mole percent of triol residues,
- (c) about 5 to about 18 mole percent of residues of an aliphatic diacid,
- (d) about 0 to about 30 mole percent of an aromatic dicarboxylic acid residue other than terephthalic acid,
- (e) about 5 to about 35 mole percent of terephthalic acid residues, and
- (f) about 12 to about 20 mole percent of aromatic hydroxy acid residues,
- wherein all the stated mole percentages are based on the total moles of (a), (b), (c), (d), (e), and (f), with the total being 100 percent;
- and wherein substantilly all of said aromatic hydroxy acid residues are located at the ends of the polymer chains to which they are attached;
- (II) about 5 to about 81 weight percent of an acrylic copolymer of ethylenically unsaturated monomers comprising at least one hydroxyl-functional monomer, said acrylic copolymer having a number average molecular weight of about 800 to about 10,000 and a weight average molecular weight of about 2,000 to 50,000;
- and
- (III) about 10 to about 50 weight percent of an amino crosslinker.
9 more elements
A thermosetting coating composition comprising
- (I) about 5 to about 81 weight percent of a curable polyester having a number average molecular weight of about 1500 to about 3500 and a weight average molecular weight of about 10,000 to about 70,000, comprising
- (a) about 20 to 36 mole percent of diol residues,
- (b) about 10 to about 21 mole percent of triol residues,
- (c) about 5 to about 18 mole percent of residues of an aliphatic diacid,
- (d) about 25 to about 35 mole percent of aromatic dicarboxylic acid residues,
- (e) about 12 to about 20 mole percent of aromatic hydroxy acid residues,
- wherein all the stated mole percentages are based on the total mole of (a), (b), (c), (d), and (e), with the total being 100 percent;
- and wherein substantially all of said aromatic hydroxy acid residues are located at the ends of the polymer chains to which they are attached;
- (II) about 5 to about 81 weight percent of an acrylic copolymer of ethylenically unsaturated monomers comprising at least one hydroxyl-functional monomer, said acrylic copolymer having a number average molecular weight of about 800 to about 10,000 and a weight average molecular weight of about 2,000 to 50,000;
- and
- (III) about 10 to about 50 weight percent of an amino crosslinker.
8 more elements
A thermosetting coating composition comprising
- (I) about 5 to about 81 weight percent of a curable polyester having a number average molecular weight of about 800 to about 3000 and a weight average molecular weight of about 3,000 to about 40,000, comprising
- (a) about 35 to 45 mole percent of diol residues,
- (b) about 4 to about 8 mole percent of triol residues,
- (c) about 0 to about 16 mole percent of residues of a linear aliphatic diacid,
- (d) about 24 to about 40 mole percent of 1,3-and/or 1,4-cyclohexanedicarboxylic acid residues,
- (e) about 12 to about 20 mole percent of aromatic hydroxy acid residues,
- wherein all the stated mole percentages are based on the total mole of (a), (b), (c), (d), and (e), with the total being 100 percent;
- and wherein substantially all of said aromatic hydroxy acid residues are located at the ends of the polymer chains to which they are attached;
- (II) about 5 to about 81 weight percent of an acrylic copolymer of ethylenically unsaturated monomers comprising at least one hydroxyl-functional monomer, said acrylic copolymer having a number average molecular weight of about 800 to about 10,000 and a weight average molecular weight of about 2,000 to 50,000;
- and
- (III) about 10 to about 50 weight percent of an amino crosslinker.
8 more elements
A thermosetting coating composition comprising
- (I) about 5 to about 81 weight percent of a curable polyester having a number average molecular weight of about 1500 to about 3000 and a weight average molecular weight of about 5,000 to about 40,000, comprising
- (a) about 20 to 36 mole percent of diol residues,
- (b) about 10 to about 21 mole percent of triol residues,
- (c) about 0 to about 16 mole percent of residues of a linear aliphatic diacid,
- (d) about 24 to about 40 mole percent of cyclohexanedicarboxylic acid residues,
- (e) about 12 to about 20 mole percent of aromatic hydroxy acid residues,
- wherein all the stated mole percentages are based on the total mole of (a), (b), (c), (d), and (e), with the total being 100 percent;
- and wherein substantially all of said aromatic hydroxy acid residues are located at the ends of the polymer chains to which they are attached;
- (II) about 5 to about 81 weight percent of an acrylic copolymer of ethylenically unsaturated monomers comprising at least one hydroxyl-functional monomer, said acrylic copolymer having a number average molecular weight of about 800 to about 10,000 and a weight average molecular weight of about 2,000 to 50,000;
- and
- (III) about 10 to about 50 weight percent of an amino crosslinker.
8 more elements
Dependencies are inferred from the claim text.