Process for formation of multilayer film

• US 5,945,218 A
• Filed: 04/24/1998
• Issued: 08/31/1999
• Est. Priority Date: 04/25/1997
• Status: Expired due to Fees

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Nakamura, Shigeru, Nakao, Yasushi
• Primary Examiner(s): DUDASH, DIANA L
• Application Number:
  US09/066,273
• Time in Patent Office: 494 Days
• Field of Search: 427/407.1, 427/409, 427/419.2, 427/410, 106/403, 428/403, 428/407, 428/411.1
• US Class Current: 428/403
• CPC Class Codes: B05D 5/066 achieved by multilayers
• CPC Class Codes: B05D 7/572 all layers being cured or baked together
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

A process for forming a multilayer film having superior high white iridescent appearance which comprises applying (A) a liquid white coating which comprises a thermosetting resin composition, a metal powder coated with a white pigment, and a titanium dioxide pigment, (B) a light-iridescent coating, and (C) a clear coating onto a substrate in this order to form a multilayer film, and then heating the substantially uncured films to crosslink and cure them simultaneously.

Claims

1. A process for forming a multilayer film comprising applying, in the following order,

(A) a liquid white coating comprising a thermosetting resin composition, a metal powder coated with a white pigment, and a titanium dioxide pigment,

(B) a light-iridescent coating, and

(C) a clear coating to form three coating films on a substrate, and

heating the substantially uncured three films to crosslink and cure them simultaneously.

2. A process of claim 1, wherein the film formed from the white coating (A) has a film elongation ratio of about from 2.5 to 50% at 20°

C.

3. A process of claim 1, wherein the film formed from the white coating (A) has a cured film hiding power of up to about 25 micrometers.

4. A process of claim 1, wherein the liquid white coating (A) is a composition comprising 100 parts by weight of a thermosetting resin composition, about from 0.1 to 30 parts by weight of a metal powder coated with a white pigment, and about from 1 to 200 parts by weight of a titanium dioxide pigment.

5. A process of claim 1, wherein the liquid white coating (A) is a composition comprising 100 parts by weight of a thermosetting resin composition, about from 1 to 7 parts by weight of a metal powder coated with a white pigment, and about from 40 to 120 parts by weight of a titanium dioxide pigment.

6. A process of claim 1, wherein the liquid white coating (A) comprises a metal powder coated with a white pigment in an amount of about from 1 to 15 parts by weight per 100 parts by weight of a titanium dioxide pigment.

7. A process of claim 1, wherein the liquid white coating (A) comprises a metal powder coated with a white pigment in an amount of about from 2 to 7 parts by weight per 100 parts by weight of a titanium dioxide pigment.

8. A process of claim 1, wherein the liquid white coating (A) can form a white film having a L value of about from 70 to 100 and a and b values of 5 or less in the Lab color system.

9. A process of claim 1, wherein the film formed from the liquid white coating (A) has a thickness of up to about 25 micrometers as cured.

10. A process of claim 1, wherein the light-iridescent coating (B) has a film elongation ratio of up to about 20% at 20°

C.

11. A process of claim 1, wherein the light-iridescent coating (B) has a cured film hiding power of at least about 50 micrometers.

12. A process of claim 1, wherein the light-iridescent coating (B) is a liquid composition comprising 100 parts by weight of a thermosetting resin composition and about from 0.1 to 20 parts by weight of a light-iridescent pigment.

13. A process of claim 1, wherein the light-iridescent coating (B) is a liquid composition comprising 100 parts by weight of a thermosetting resin composition and about from 3 to 10 parts by weight of a light-iridescent pigment.

14. A process of claim 1, wherein the light-iridescent coating (B) has a thickness of about from 10 to 50 micrometers as cured.

15. A process of claim 1, wherein the clear coating (C) has a thickness of about from 10 to 50 micrometers as cured.

16. A process of claim 1, wherein the films formed from the coatings (A), (B) and (C) are heated at a temperature of 100 to 180°

C. to crosslink and cure them simultaneously.

17. A coated article obtained by the process of claim 1.