High gloss and/or high DOI coating utilizing carbamate-functional polymer composition

• US 5,605,965 A
• Filed: 11/03/1994
• Issued: 02/25/1997
• Est. Priority Date: 10/23/1992
• Status: Expired due to Term

• Current Assignee: BASF Corporation (BASF SE)
• Original Assignee: BASF Corporation (BASF SE)
• Inventors: St. Aubin, Donald L., Rehfuss, John W.
• Primary Examiner(s): Lipman, Bernard
• Application Number:
  US08/333,916
• Time in Patent Office: 845 Days
• Field of Search: 525/157, 525/163, 525/100, 525/134, 525/328.2, 525/384, 525/386
• US Class Current: 525/100
• 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

Abstract

High gloss and/or high DOI coatings are described. The coatings are based on 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 coating having a 20°

gloss, as defined by ASTM D523-89, of at least 80 or a DOI, as defined by ASTM E430-91, of at least 80, or both, derived from a curable coating composition comprising;

(a) a first component comprising a polymer backbone having appended thereto at least one carbamate functional group represented by the formula;

##STR4## and (b) a second component comprising a compound having a plurality of functional groups that are reactive with said carbamate group.

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

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

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

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

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

7. A coating 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 coating according to claim 1 wherein component (b) is an aminoplast resin.

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

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

11. A coating according to claim 1 wherein the first component is represented by randomly repeating units according to the formula:

##STR5## 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 %.

12. A coating according to claim 11 wherein R₁ represents CH₃.

13. A coating according to claim 11 wherein x represents 40 to 60 weight % and y represents 60 to 40 weight %.

15. A coating according to claim 1 having a 20°

gloss, as defined by ASTM D523-89, of at least 80.

16. A coating according to claim 1 having a DOI, as defined by ASTM E430-91, of at least 80.

17. A coating according to claim 1 wherein said curable coating composition is in the form of a substantially solid powder or dispersion.

18. A coating according to claim 1 wherein said curable coating composition is in a liquid state in an organic solvent.

19. A coating according to claim 18 wherein said organic is a polar organic solvent.

20. A coating according to claim 1 that is substantially free of ether linkages in its crosslink matrix derived from said curable coating composition.

14. A coating according to 11 wherein --L-- is represented by the formula --COO--L'"'"'-- where L'"'"' is a divalent linking group.