Urethane coating composition

• US 4,892,906 A
• Filed: 09/28/1988
• Issued: 01/09/1990
• Est. Priority Date: 09/28/1988
• Status: Expired due to Fees

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Michael, William E., Pham, Phung N.
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US07/250,275
• Time in Patent Office: 468 Days
• Field of Search: 524/730, 525/124
• US Class Current: 524/730
• CPC Class Codes: C08G 18/4063 Mixtures of compounds of group C08G18/62 with other macromolecular compounds
• CPC Class Codes: C08L 2666/16 Addition or condensation polymers of aldehydes or ketones according to C08L59/00 - C08L61/00; Derivatives thereof
• CPC Class Codes: C09D 175/04 Polyurethanes

Abstract

A coating composition is disclosed including an acrylic polyol, polyester polyol, a blend of curing agents, e.g., a blocked isocyanate and an aminoplast resin, and a liquid carrier. Optionally, pigmentation can be added, e.g., pigmentation adapted to provide camouflage under military specification MIL-C-46168D.

Claims

1. A thermosetting coating composition comprising:

(a) an acrylic polyol;

(b) a polyester polyol;

(c) a blend of curing agents; and

(d) a liquid carrier.

2. The composition of claim 1 wherein the blend of curing agents includes an aminoplast resin and a blocked polyisocyanate.

3. The composition of claim 1 further comprising pigments adapted to provide low gloss and a camouflaged spectral reflectance.

4. The composition of claim 1 wherein the acrylic polyol is characterized as a stepwise reaction product of:

(i) a hydroxy-containing acrylic copolymer;

(ii) a dicarboxylic acid anhydride; and

(iii) a monoepoxide functional monomer.

5. The composition of claim 1 wherein the acrylic polyol is characterized as a stepwise reaction product of:

(i) a hydroxy-containing acrylic copolymer prepared from a mixture including (a) about 5 to about 35 percent by weight of a monoethylenically unsaturated hydroxy-containing monomer and (b) from about 65 to about 95 percent by weight of other monoethylenically unsaturated monomers;

(ii) a dicarboxylic acid anhydride; and

(iii) a monoepoxide functional monomer.

6. The composition of claim 1 wherein the acrylic polyol is characterized as a stepwise reaction product of:

(i) a hydroxy-containing acrylic copolymer prepared from (a) about 5 to about 35 percent by weight of a hydroxyalkyl acrylate or methacrylate having from about 2 to about 6 carbon atoms in the alkyl group, (b) from about 1 to about 10 percent by weight of acrylic acid or methacrylic acid; and

(c) from about 65 to about 95 percent by weight of a vinyl aromatic compound;

(ii) tetrahydrophthalic anhydride; and

(iii) a glycidyl ester of tertiary mono-carboxylic acid blend having carbon chain lengths of from 9 to 11 carbon atoms.

7. The composition of claim 1 wherein the polyester polyol is characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride.

8. The composition of claim 4 wherein the polyester polyol is characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride.

9. The composition of claim 5 wherein the polyester polyol is characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride.

10. The composition of claim 6 wherein the polyester polyol is characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride.

11. The composition of claim 1 wherein the acrylic polyol is characterized as a stepwise reaction product of:

(i) a hydroxy-containing acrylic copolymer, (ii) a dicarboxylic acid anhydride, and (iii) a monoepoxide functional monomer;

the polyester polyol is characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride;

the blend of curing agents includes an aminoplast resin characterized as a partially alkylated melamine-formaldehyde resin modified by methanol and a blocked polyisocyanate characterized as a methyl ethyl ketoxime blocked isocyanurate of hexamethylene diisocyanate.

12. The composition of claim 11 further comprising pigments adapted to provide a camouflaged spectral reflectance.

13. The composition of claim 12 wherein the pigments include a silane-treated silica adapted to reduce gloss of the resultant coating.

14. A coating composition comprising:

(a) an acrylic polyol characterized as a stepwise product of;

(i) a hydroxy-containing acrylic copolymer prepared from (1a) about 5 to about 35 percent by weight of a hydroxyalkyl acrylate or methacrylate having from about 2 to about 6 carbon atoms in the alkyl group, (1b) from about 1 to about 10 percent by weight of acrylic or methacrylic acid, and (1c) from about 65 to about 95 percent by weight of a vinyl aromatic compound;

(ii) tetrahydrophthalic anhydride; and

(iii) a glycidyl ester of tertiary mono-carboxylic acid blend having carbon chain lengths of from 9 to 11 carbon atoms;

(b) a polyester polyol characterized as a reaction product of neopentyl glycol and hexahydrophthalic anhydride;

(c) a blend of curing agents including a melamine resin characterized as a partially alkylated melamine-formaldehyde resin modified by methanol and a blocked diisocyanurate characterized as a methyl ethyl ketoxime blocked isocyanurate of hexamethylene diisocyanate;

(d) pigments adapted for providing low gloss and camouflaged IR reflectance; and

(e) a liquid carrier.