Curable film-forming compositions containing reactive functional polymers and polysiloxane resins, multilayer composite coatings, and methods for their use

Patent metadata

Field	Value
Publication number	US-2020140680-A1
Application number	US-201816631015-A
Country	US
Kind code	A1
Filing date	Jul 12, 2018
Priority date	Jul 14, 2017
Publication date	May 7, 2020
Grant date	—

Abstract

A curable film-forming composition is provided, comprising: (a) a polymeric binder comprising reactive functional groups; (b) a curing agent comprising functional groups that are reactive with the reactive functional groups of (a); and (c) a polysiloxane resin comprising aromatic functional groups and terminal active hydrogen groups. In certain examples of the present invention, the polymeric binder (a) comprises an acrylic polyol prepared from a monomer mixture comprising a hydroxyl functional monomer, and the curable film-forming composition further comprises a rheology modifier comprising: (1) a non-aqueous dispersion of an internally crosslinked organic polymer; (2) a silica dispersion; and/or (3) a reaction product of an amine and an isocyanate. Also provided are coated substrates that include the curable film-forming compositions described above and methods for forming a composite coating on a substrate.

First claim

What is claimed is:

1 . A curable film-forming composition comprising:
(a) a polymeric binder comprising reactive functional groups; (b) a curing agent comprising functional groups that are reactive with the reactive functional groups of (a); and (c) a polysiloxane resin comprising aromatic functional groups and terminal active hydrogen groups.

2 . The curable film-forming composition according to claim 1 wherein the polymeric binder (a) comprises an acrylic polyol prepared from a monomer mixture comprising a hydroxyl functional monomer; the curing agent (b) comprises functional groups that are reactive with hydroxyl functional groups; and wherein the curable film-forming composition further comprises:
(d) a rheology modifier comprising:
(1) a non-aqueous dispersion of an internally crosslinked organic polymer;
(2) a silica dispersion; and/or
(3) a reaction product of an amine and an isocyanate;

3 . The curable film-forming composition according to claim 1 , wherein the polymeric binder (a) comprises an epoxide functional polymer.

4 . The curable film-forming composition according to claim 1 , wherein the polymeric binder (a) comprises an acrylic polyol and/or a polyester polyol.

5 . The curable film-forming composition according to claim 1 , wherein the polymeric binder (a) further comprises carbamate groups.

6 . The curable film-forming composition according to claim 1 , wherein the curing agent (b) comprises an aminoplast, a polyacid, and/or a polyisocyanate.

7 . The curable film-forming composition according to claim 1 , wherein the terminal active hydrogen groups on the polysiloxane resin (c) comprise hydroxyl and/or carboxylic acid groups.

8 . The curable film-forming composition according to claim 1 , wherein the polysiloxane resin (c) comprises urethane and/or ether linkages.

9 . The curable film-forming composition according to claim 1 wherein the polysiloxane resin (c) is present in the curable film-forming composition in an amount of at least 0.5 percent by weight, based on the total weight of resin solids in the curable film-forming composition.

10 . A coated substrate comprising:
A) a substrate; and B) a film-forming composition applied to a surface of the substrate, forming a coating; wherein the film-forming composition comprises the curable film-forming composition of claim 1 .

11 . A coated substrate comprising:
A) a substrate; and B) a film-forming composition applied to a surface of the substrate, forming a coating; wherein the film-forming composition comprises the curable film-forming composition of claim 2 .

12 . A multi-component composite coating comprising a first film-forming composition applied to a substrate to form a colored base coat, and a second, transparent film-forming composition applied on top of the base coat to form a clear top coat, wherein the transparent film-forming composition comprises the curable film-forming composition of claim 1 .

13 . The multi-component composite coating according to claim 12 wherein, the multi-component composite coating further comprises a primer composition applied to the substrate prior to application of the first film-forming composition.

14 . A method for forming a composite coating on a substrate comprising: (A) applying a first film-forming composition to at least a portion of a surface of the substrate to form a colored base coat; and (B) applying a second, transparent film-forming composition to at least a portion of the base coat formed in step (A) prior to substantially curing the first film-forming composition, to form a clear top coat thereon, wherein the transparent film-forming composition comprises the curable film-forming composition of claim 1 .

15 . The method according to claim 14 , wherein the method further comprises a step of forming a primer coating upon the surface of the substrate prior to applying the first film-forming composition of step (A), wherein the first coating composition is applied directly onto the primer coating.

16 . The method according to claim 15 , wherein the primer coating is cured prior to applying the first coating composition of step (A).

17 . The method according to claim 14 , wherein the method further comprises (C) holding the substrate at a temperature and for a time sufficient to substantially cure the composite coating after all coating compositions have been applied to the substrate.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Lewis Jason Ryan
• Donaldson Susan Fundy
• Luchansky Matthew S
• Swarup Shanti
• Burgman John W
• Jones Justin
• Cao Bin
• Zhou Hongying
• Kirby Danielle

Classifications

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J2333/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title