Method of forming coating films

• US 5,330,796 A
• Filed: 05/05/1992
• Issued: 07/19/1994
• Est. Priority Date: 05/15/1991
• Status: Expired due to Fees

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Ito, Satoru, Nakamura, Shigeru, Kasari, Akira
• Primary Examiner(s): Pal, Asok
• Assistant Examiner(s): ACHUTAMURTHY, PONNATHAPURA N
• Application Number:
  US07/878,461
• Time in Patent Office: 805 Days
• Field of Search: 427/407.1, 427/409, 427/410
• US Class Current: 427/407.1
• CPC Class Codes: B05D 2401/10 Organic solvent B05D2401/21 takes precedence
• CPC Class Codes: B05D 2420/01 first layer from the substrate side
• CPC Class Codes: B05D 2451/00 Type of carrier, type of coating (Multilayers)
• CPC Class Codes: B05D 2601/02 used for pigmentation effect, e.g. metallic effect
• CPC Class Codes: B05D 5/068 achieved by multilayers B05D5/066 takes precedence
• CPC Class Codes: B05D 7/532 the two layers being cured or baked together, i.e. wet on wet
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/54 Inorganic substances
• 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: C08L 83/04 Polysiloxanes
• CPC Class Codes: C09D 133/06 of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09D 143/04 Homopolymers or copolymers of monomers containing silicon
• CPC Class Codes: C09D 167/00 Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain based on polyester-amides C09D177/12; based on polyester-imides C09D179/08; Coating compositions based on derivatives of such polymers

Abstract

The invention provides a method of forming a coating film by forming in sequence a pigmented base coat and a clear top coat on a substrate followed by finishing by the two-coat one-bake technique, the method being characterized by using, as a coating composition for pigmented base coat formation, a composition comprising, as essential components thereof,

(1) an OH-containing resin,

(2) an amino resin,

(3) a polyorganosiloxane

(4) a flaky metal powder and/or a mica powder, and

( 5 ) an organic solvent,

and using, as a coating composition for clear top coat formation, a composition comprising, as essential components thereof,

(1) an OH-containing base resin which further contains at least one group selected from the class consisting of a silanol group and a hydrolyzable group bound directly to a silicon atom,

( 2 ) an amino resin, and

( 3 ) an organic solvent.

Claims

1. A method of forming a coating film by forming in sequence a pigmented base coat and a clear top coat on a substrate followed by finishing by the two-coat one-bake technique, the method being characterized by using, as a coating composition for pigmented base coat formation, a composition comprising, as essential components thereof,

(1) at least one OH-containing resin selected from the group consisting of an OH-containing polyester resin and an OH-containing vinyl resin, each having a hydroxyl value of about 20 to 200,

(2) a methylol amino resin etherified with an alcohol,

(3) a polyorganosiloxane which has, on an average, at least two groups, per molecule, each selected from the class consisting of a silanol group and an alkoxysilane group and has a number average molecular weight of at least 1,000 the polyorganosiloxane optionally having, on an average, at least one epoxy group per molecule, the polyorganosiloxane being prepared by subjecting to hydrolysis condensation a silane compound of the general formula

View Dependent Claims (2, 3)

2. A method of forming coating films as claimed in claim 1, wherein, in the pigmented base coat composition, the proportions of the OH-containing resin, methylol amino resin and polyorganosiloxane are 5 to 90% by weight, 5 to 50% by weight and 1 to 40% by weight, respectively, based on the total amount (resin solids) of the OH-containing resin, methylol amino resin and polyorganosiloxane.

3. A method of forming coating films as claimed in claim 1, wherein, in the clear top coat composition, the proportion of the methylol amino resin is 2 to 100 parts by weight per 100 parts by weight of the base resin.