Claims
- 1. A process for applying a composite coating to a substrate comprising:
- (1) applying to the surface of the substrate an aqueous-based film-forming composition containing color pigments and a water-dilutable polyurethane binder,
- (2) forming a basecoat on the surface of the substrate from the composition applied from step 1,
- (3) applying to said basecoat a film-forming composition,
- (4) forming a transparent topcoat from the composition applied in step 3 over the basecoat.
- 2. The process of claim 1 in which the polyurethane is formed by chain extending an NCO-prepolymer in aqueous medium with an active hydrogen-containing compound having at least two active hydrogen groups which are more reactive with NCO groups than water.
- 3. The process of claim 2 in which the polyurethane contains at least 8 percent by weight urethane moieties.
- 4. The process of claim 1 in which a free film of the polyurethane has a percent elongation of greater than 40 percent and a tensile strength greater than 2000 psi.
- 5. The process of claim 1 in which the polyurethane is a poly(ester-urethane).
- 6. The process of claim 5 in which the poly(ester-urethane) is a poly(ether-ester)urethane.
- 7. The process of claim 1 in which the basecoat composition contains an aminoplast.
- 8. The process of claim 1 in which the metallic pigment is aluminum flake.
- 9. The process of claim 1 in which the basecoat composition is applied by spraying.
- 10. The process of claim 1 in which the substrate comprises both metallic and elastomeric parts and the basecoat composition is applied to both parts.
- 11. The process of claim 1 in which the topcoat composition is a one-package system comprising an active hydrogen-containing polymer and an aminoplast.
- 12. The process of claim 11 in which the active hydrogen-containing polymer is an acrylic polymer.
- 13. The process of claim 11 in which the active hydrogen-containing polymer is a polyurethane.
- 14. The process of claim 1 in which the topcoat composition is a two-pack system comprising an active hydrogen-containing polymer and a polyisocyanate.
- 15. The process of claim 1 in which the active hydrogen-containing polymer is a polyurethane.
- 16. The process of claim 1 in which the topcoat composition is organic solvent based.
- 17. The process of claim 1 in which the topcoat composition is aqueous based.
- 18. The process of claim 16 in which the topcoat composition is sprayable at a resin solids content of at least 40 percent by weight.
- 19. A process for applying a composite coating to a substrate comprising both metallic and elastomeric parts, comprising:
- (1) spraying the substrate with an aqueous-based coating composition containing metallic pigments and a water-dilutable poly(ester-urethane) binder which is formed by chain extending an NCO-poly(ester-urethane) prepolymer in aqueous medium with an active hydrogen-containing compound having at least two active hydrogen groups which are more reactive with NCO groups than water;
- (2) forming a basecoat on the surface of the substrate from the composition applied from step 1;
- (3) applying to said basecoat a film-forming composition from a two-package organic solvent-based system comprising a polyurethane polyol and a polyisocyanate, said film-forming composition being sprayable at a resin solids content of at least 40 percent by weight;
- (4) forming a transparent topcoat from the composition applied from step 3.
- 20. The process of claim 19 in which the basecoat composition contains an aminoplast.
- 21. An article coated by the process of claim 1.
- 22. An article coated by the process of claim 19.
Parent Case Info
This application is a continuation of application Ser. No. 653,735, filed Sept. 21, 1984 now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
11703-83 |
Sep 1983 |
AUX |
967051 |
Aug 1964 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
653735 |
Sep 1984 |
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