High solids coating and process for coating

Patent metadata

Field	Value
Publication number	US-9365738-B2
Application number	US-201214363853-A
Country	US
Kind code	B2
Filing date	Nov 16, 2012
Priority date	Dec 9, 2011
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

Described is a high solids coating composition having exceptional rheological properties and appearances comprising (a) a thermosetting binder, (b) from about 0.1 to about 10 wt. % based on binder solids of solid polyurea particles prepared by the reaction of a mixture of a polyisocyanate and an amino reactant comprising a primary or secondary monoamine that optionally has a hydroxyl or ether group or both, and (c) from about 2 to about 25 wt. % on resin solids of an acrylic polymer having a number average molecular weight of from about 2000 to about 8000 and a glass transition temperature of from about 50 to about 120° C.

First claim

What is claimed is:

1. A high solids coating composition comprising
(a) a thermosetting curable or crosslinking binder selected from the group consisting of polyesters; polyurethanes; polyurethanes prepared using macomonomers selected from polyester diols, polyether diols, and polycarbonate diols; alkyds; epoxy resins; polycarbonates; polyamides; polyimides; polysiloxanes; and unsaturated oligomers and resins; and mixtures thereof,
(b) from about 0.1 to about 10 wt. % based on binder solids of solid polyurea particles prepared by reacting a reaction mixture of a polyisocyanate and an amino reactant comprising a primary or secondary monoamine that optionally has a hydroxyl or ether group or both, and
(c) from about 2 to about 25 wt. % based on binder solids of an acrylic polymer having a number average molecular weight of from about 2000 to about 8000 and a glass transition temperature of from about 65 to about 120° C., wherein the acrylic polymer comprises cycloaliphatic monomer units.

2. The high solids coating composition according to claim 1 , comprising a flake pigment.

3. The high solids coating composition according to claim 1 , further comprising a rheology control agent selected from a cellulose mixed ester other than a low molecular weight cellulose mixed ester, crosslinked acrylic polymeric microparticles, an inorganic phyllosilicate, a fumed silica, or combinations thereof.

4. The high solids coating composition according to claim 1 , wherein the reaction mixture further comprises water, a polyamine, a monoisocyanate, or a combination thereof.

5. The high solids coating composition according to claim 1 , wherein the polyisocyanate comprises an aliphatic or homocyclic diisocyanate containing 6-9 carbon atoms or wherein the polyisocyanates is selected from the group consisting of cyclohexyl-1,4-diisocyanate, toluene diisocyanates, hexamethylene diisocyanate, isocyanurates of these, and combinations of these.

6. The high solids coating composition according to claim 1 , wherein the amino reactant comprises a member selected from the group consisting of benzylamine, ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, tert-butylamine, 2-aminoethanol, 1-aminoethanol, 2-aminopropanol, 3-aminopropanol, 1-amino-2-propanol, 2-amino-2-methyl propanol, 2-methoxyethylamine, 2-ethoxyethylamine, 3-methoxy-1-propylamine, 1-methoxymethylpropylamine, and combinations of these.

7. The high solids coating composition according to claim 1 , wherein the solid polyurea particles are prepared by the reaction of the mixture in at least one of an acrylic, polyester, or polyurethane resin.

8. The high solids coating composition according to claim 1 , wherein the acrylic polymer has a weight average molecular weight of from about 5000 to about 25,000 or a polydispersity of from about 2.0 to about 4, or both.

9. The high solids coating composition according to claim 1 , wherein the acrylic polymer has active hydrogen functionality.

10. The high solids coating composition according to claim 1 , wherein the cycloaliphatic monomer units are included in the acrylic polymer in amounts of from about 45% to about 85% by weight based on acrylic polymer weight.

11. The high solids coating composition according to claim 1 , having at least about 40 wt. %, nonvolatile content.

12. A method of coating a substrate, comprising spray applying the high solids coating composition according to claim 1 in a layer on a substrate, then curing the applied coating composition to produce a cured coating on the substrate.

13. A method of coating a substrate, comprising applying at least one primer coating composition to form a primer layer, at least one basecoat composition to form a basecoat layer, and at least one clearcoat composition to form a clearcoat layer to a substrate; wherein the basecoat composition is applied when the primer layer is uncured; wherein the basecoat composition is the high solids coating composition according to claim 1 .

14. A method of coating a substrate, comprising applying at least one primer coating composition to form a primer layer, at least one basecoat composition to form a basecoat layer, and at least one clearcoat composition to form a clearcoat layer to a substrate; wherein the clearcoat composition is applied when the basecoat layer is uncured; wherein the basecoat composition is the high solids coating composition according to claim 1 .

15. A method of coating a substrate, comprising applying at least one primer coating composition to form a primer layer, at least one basecoat composition to form a basecoat layer, and at least one clearcoat composition to form a clearcoat layer to a substrate; where the basecoat composition is applied when the primer layer is uncured and the clearcoat composition is applied when the basecoat layer is uncured; and wherein the basecoat composition is the high solids coating composition according to claim 1 .

16. A method of coating a substrate, comprising applying the high solids coating composition according to claim 1 as a monocoat topcoat layer on a substrate.

17. A method of improving rheology control during a process of applying a high solids coating composition in a layer on a substrate and curing the applied layer, the method comprising including in the high solids coating composition from about 0.1 to about 10 wt. % based on binder solids of solid polyurea particles prepared by the reaction of a mixture of a polyisocyanate and an amino reactant comprising a primary or secondary monoamine that optionally has a hydroxyl or ether group or both, and from about from about 2 to about 25 wt. % based on binder solids of an acrylic polymer having a number average molecular weight of from about 2000 to about 8000 and a glass transition temperature of from about 65 to about 120° C., wherein the acrylic polymer comprises cycloaliphatic monomer units, wherein the high solids coating composition comprises a thermosetting curable or crosslinkable binder selected from the group consisting of polyesters; polyurethanes; polyurethanes prepared using macomonomers selected from polyester diols, polyether diols, and polycarbonate diols; alkyds; epoxy resins; polycarbonates; polyamides; polyimides; polysiloxanes; and unsaturated oligomers and resins; and mixtures thereof.

18. The method according to claim 17 , wherein the high solids coating composition further comprises a member selected from the group consisting of an additional cellulose mixed ester other than a low molecular weight cellulose mixed ester, crosslinked acrylic polymeric microparticles, an inorganic phyllosilicate, a fumed silica, and combinations thereof.

Assignees

• Basf Coatings Gmbh

Inventors

• December Timothy S
• Partyka John G
• Campbell Donald H

Classifications

• B05D3/007

  After-treatment · CPC title

• C08L75/02

  Polyureas · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08L61/28

  with melamine · CPC title