Coating method

• US 5,002,809 A
• Filed: 05/31/1989
• Issued: 03/26/1991
• Est. Priority Date: 05/31/1988
• Status: Expired due to Fees

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Nakahama, Tadamitsu
• Primary Examiner(s): Lusignan, Michael
• Application Number:
  US07/359,338
• Time in Patent Office: 664 Days
• Field of Search: 427/407.1, 427/409, 427/410
• US Class Current: 427/407.1
• CPC Class Codes: B05D 1/02 performed by spraying
• CPC Class Codes: B05D 1/34 Applying different liquids or other fluent materials simultaneously
• CPC Class Codes: B05D 3/0209 Multistage baking
• CPC Class Codes: B05D 3/0254 After-treatment
• CPC Class Codes: B05D 7/16 using synthetic lacquers or varnishes
• CPC Class Codes: B05D 7/542 the two layers being cured or baked together
• CPC Class Codes: B05D 7/58 No clear coat specified

Abstract

A coating method of an external surface of a vehicle body comprising steps of applying an urethane base coating material to a first area of the vehicle body to form an anti-chipping coating on the first area, applying an intercoating material including a solvent and an anti-sagging agent by spray to the the first area on which the anti-chipping coating has been formed and a second area of the vehicle body other than the first area to form an intercoating when the anti-chipping coating is in a wet condition. First intercoating material is applied to the first area to form one part of the intercoating. Second intercoating material is applied to the second area to form the other part of the intercoating. The first intercoating material is greater than the second intercoating material in an anti-sagging property so that the resultant coating has an improved smoothness and anti-chipping property.

Claims

1. A coating method of an external surface of a vehicle body comprising steps of:

(a) applying an anti-chipping coating material having an urethane base coating material and a solvent on a first area of a vehicle body where an anti-chipping coating is desired so that an anti-chipping coating is formed on the first area;

(b) applying a first intercoating material having an anti-sagging property on the first area when the anti-chipping coating is in a wet condition; and

(c) applying a second intercoating material having an anti-sagging property on a second area of the vehicle body other than the first area when the anti-chipping coating is in the wet condition,

wherein the first intercoating material is greater than the second intercoating material in the anti-sagging property.

2. A coating method in accordance with claim 1 wherein the first intercoating material is greater than the second intercoating material in viscosity.

3. A coating method in accordance with claim 2 wherein the first intercoating material includes less solvent than the second intercoating material.

4. A coating method in accordance with claim 1 wherein the first intercoating material includes more anti-sagging agent than the second intercoating material.

5. A coating method in accordance with claim 4 wherein the anti-sagging agent comprises a crosslinked acrylic resin powder.

6. A coating method in accordance with claim 1 wherein the first intercoating material is applied to the first area by utilizing first spray means, the second intercoating material being applied to the second area by utilizing second spray means independent from the first spray means.

7. A coating method in accordance with claim 6 wherein the first intercoating material is supplied to the first spray means through first passage means, the second intercoating material being supplied to the second spray means through second passage means independent from the first passage means.

8. A coating method in accordance with claim 6 wherein the second intercoating material is supplied to the first spray means in addition to the first intercoating material to be intermingled with each other and thereafter applied to the first area.

9. A coating method in accordance with claim 8 wherein the first intercoating material is greater than the second intercoating material in viscosity.

10. A coating method in accordance with claim 9 wherein the first intercoating material includes less solvent than the second intercoating material.

11. A coating method in accordance with claim 10 wherein the first intercoating material includes more anti-sagging agent than the second intercoating material.

12. A coating method in accordance with claim 1 wherein the first intercoating material is greater in viscosity and includes more anti-sagging agent than the second intercoating material.

13. A coating method in accordance with claim 12 wherein the first intercoating material includes less solvent than the second intercoating material.

14. A coating method in accordance with claim 8 wherein the first intercoating material is greater in viscosity and includes more anti-sagging agent than the second intercoating material.

15. A coating method in accordance with claim 14 wherein the first intercoating material includes less solvent than the second intercoating material.

16. A coating method in accordance with claim 1 wherein the improvement further comprises a step of applying an overcoating material to the first and second area after applying the first and second intercoating materials thereto.

17. A coating method in accordance with claim 1 wherein the urethane base coating material is an one-can urethane paint.