Composite color-plus-clear coating utilizing carbamate-functional polymer composition in the clearcoat

• US 5,356,669 A
• Filed: 10/23/1992
• Issued: 10/18/1994
• Est. Priority Date: 10/23/1992
• Status: Expired due to Fees

• Current Assignee: BASF Corporation (BASF SE)
• Original Assignee: BASF Corporation (BASF SE)
• Inventors: St. Aubin, Donald L., Rehfuss, John W.
• Primary Examiner(s): Pal, Asok
• Assistant Examiner(s): ACHUTAMURTHY, PONNATHAPURA N
• Application Number:
  US07/965,577
• Time in Patent Office: 725 Days
• Field of Search: 427/407.1, 427/409, 427/412.1, 428/500
• US Class Current: 427/407.1
• CPC Class Codes: C08G 18/3831 containing urethane groups
• CPC Class Codes: C08G 18/728 Polymerisation products of compounds having carbon-to-carbon unsaturated bonds and having isocyanate or isothiocyanate groups or groups forming isocyanate or isothiocyanate groups
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 61/20 Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen with aminophenols C08L61/04
• CPC Class Codes: C09D 133/062 Copolymers with monomers not covered by C09D133/06
• CPC Class Codes: C09D 201/025 containing nitrogen atoms
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

A method of producing an article with a color-plus-clear composite coating is described. The method comprises the steps of applying a colored coating composition to a substrate, and applying a clear coating composition over the colored coating composition, wherein the clear coating composition is a curable coating composition comprising:

(a) a first component comprising a polymer backbone having appended thereto at least one carbamate functional group, and

(b) a second component comprising a compound having a plurality of functional groups that are reactive with said carbamate group.

Claims

1. A method of producing a color-plus-clear composite coating on a substrate comprising the steps of applying a colored coating composition to said substrate, and applying a clear coating composition over the colored coating composition, wherein the clear coating composition is a curable coating composition comprising:

(a) a first component comprising a polymer backbone having appended thereto at least one carbamate functional group, said first component represented by randomly repeating units according to the formula;

##STR4## R₁ represents H or CH₃, R₂ represents H,

L represents a divalent linking group,

A represents repeat units derived from one or more ethylenically unsaturated monomers,

x represents 10 to 90 weight %, and

y represents 90 to 10 weight %, and

(b) a second component comprising a compound having a plurality of functional groups that are reactive with said carbamate group.

2. A method according to claim 1 wherein said polymer backbone is derived from one or more ethylenically unsaturated monomers.

3. A method according to claim 2 wherein said ethylenically unsaturated monomers comprise a carbamate group.

4. A method according to claim 2 wherein said ethylenically unsaturated monomers comprise one or more acrylic monomers.

5. A method according to claim 4 wherein said acrylic monomers comprise a carbamate group.

6. A method according to claim 2 wherein 10-90% of said ethylenically unsaturated monomers are acrylic monomers.

7. A method according to claim 1 wherein component (b) is selected from the group consisting of aminoplast resin, polysiloxanes, polyanhydrides, and compounds having a plurality of active methylol functional groups.

8. A method according to claim 1 wherein component (b) is an aminoplast resin.

9. A method according to claim 8 wherein said aminoplast resin is melamine formaldehyde resin.

10. A method according to claim 9 wherein said melamine formaldehyde resin is fully or partially alkylated.

11. A method according to claim 1 wherein R₁ represents CH₃.

12. A method according to claim 1 wherein x represents 40 to 60 weight % and y represents 60 to 40 weight %.

13. A method according to claim 1 wherein --L-- is represented by the formula --COO--L'"'"'-- where L'"'"' is a divalent linking group.

14. A substrate having thereon a color-plus-clear composite coating prepared according to the method of claim 1.