Metallic/clear coat system

Abstract

The present invention provide a novel coating method for forming a metallic coat having excellent appearance. The coating method comprises the successive steps of:(a) coating an article with an sealercoating composition,(b) coating the sealercoated article with an aqueous metallic basecoating composition without curing the sealercoating composition,(c) flashing and/or baking the article obtained in Step (b),(d) coating the article obtained in Step (c) with a thermosetting clear coating composition, and,(e) baking the coated article.

Description

Claims

1. A coating method for forming a metallic coat comprising the successive steps of:

(a) coating an article with an electrocating composition and baking it,

(b) coating the thus-baked article with a sealer coating composition,

(c) coating the sealer coated article with an aqueous metallic base coating resinous composition without curing the sealer coating composition,

(d) flashing and/or baking the article obtained in Step (c),

(e) coating the article obtained in Step (d) with a thermosetting clear coating resinous composition, and,

(f) baking the coated article.

2. The coating method according to claim 1, wherein the sealercoating composition is an capable of being dispersed in an organic solvent or water.

3. The coating method according to claim 1 wherein the sealercoating composition further contains resin particles in an amount of 1 to 60 % by weight.

4. The coating method according to claim 3 wherein the resin particles are resin powder which is prepared by grinding a molten resin into an average particle size of 5 to 50 micron.

5. The coating method according to claim 3 wherein the resin particles are resin fine particles having an average particle size of 0.01 to 10 micron.

6. The coating method according to claim 3 wherein the sealercoating composition is an aqueous coating composition containing the ground resin powder and the thermosetting clear coating resinous composition is capable of being dispersed in an organic solvent or water.

7. The coating method according to claim 3 wherein the sealercoating composition contains the resin fine particle having a particle size of 0.01 to 10 micron and the the thermosetting clear coating resinous composition is capable of being dispersed in an organic solvent or water.

8. A method according to claim 6, wherein the metallic base coating resinous composition contains a resin selected from the group consisting of amino-alkyl resins, amino-acryl rsins, urethane resins and acryl-urethane resins.

9. A method according to claim 1, wherein the sealer coating composition is capable of being dispersed in water or in an organic solvent and contains a resin selected from the group consisting a acyl resins, alkyd resins or polyester resins.

10. A method according to claim 9, wherein the sealer coated composition is a composition capable of being dispersed in water.

11. A method according to claim 9, wherein the sealer composition is a composition capable of being dispersed in an organic solvent and contains an organic solvent therein.

12. A method according to claim 9, wherein the metallic base coating applied to the sealer coating composition is applied by a wet-on-wet method.

13. A method according to claim 1, whrein the sealer coating composition is a thermosetting resinous coating composition.

14. A method according to claim 8, wherein the clear coating resinous composition contains a resin selected from the group cosnisting of alkyl resins, acryl resins, urethane resins, acryl-urethane resins, epoxy resins and polyester resins.