US4759961A
Expired / Lapsed
US
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Coating method with crosslinked coatings from two coat-one bake systems
Assignee: Kansai Paint Co Ltd
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Filing: 1987-05-12
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Granted: 1988-07-26
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Expires: 2007-05-12
Abstract
Abstract In a method for forming coatings, comprising the steps of applying a base coating containing a coloring pigment and/or a metallic pigment to produce a base coat, applying a topcoating containing a hydroxyl group-containing resin and a polyisocyanate compound over the base coat, and curing the coats at a temperature range between room temperature to about 140° C., the method which is characterized in that the base coating contains the following as a vehicle component; (a) a resin having hydroxyl group and carboxyl group in the molecule, (b) a combination of the resin having hydroxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and the isocyanate group of the polyisocyanate compound in the topcoating or (c) a combination of the resin having hydroxyl group and carboxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and the isocyanate group of the polyisocyanate compound in the topcoating.
Inventors
- 👤 Tadahiro Kato
- 👤 Yasuhiro Fujii
- 👤 Hiroaki Kiyata
- 👤 Masaru Mitsuzi
- 👤 Mototaka Iihashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:52
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/24; B05D7/26; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/28; C08G18/40; C08G18/42; C08G18/4263; C08G18/62; C08G18/6216; C08G18/625; C08G18/6254; C08G18/63; C08G18/633; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/0423; C08J7/043; C09; C09D; C09D175/00; C09D175/04; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2475/00; C08J2475/04; C08J2475/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
235 words
In a method for forming coatings on a substrate, comprising the steps of applying to the substrate a base coating consisting essentially of (i) a coloring pigment and/or a metallic pigment and (ii) a vehicle component in a solvent to produce a base coat, appying a topcoating containing a hydroxyl group-containing resin and a polyisocyanate compound over the base coat, and curing the coats at a temperature range between room temperature and about 140° C., the improvement wherein the vehicle component is selected from the group consisting of: (a) a resin having a hydroxyl group and a carboxyl group in the molecule; (b) a combination of a resin having a hydroxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and an isocyanate group of the polyisocyanate compound in the topcoating; and (c) a combination of a resin having a hydroxyl group and a carboxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and an isocyanate group of the polyisocyanate compound in the topcoating; wherein the resin contained in the base coating has a number-average molecular weight of about 5,000 to about 100,000 when the solvent of the base coating is an organic solvent and a number-average molecular weight of about 5,000 to about 2,000,000 when the solvent of the base coating is an aqueous solvent.
Claim 2
Dependent Claim
235 words
In a method for forming coatings on a substrate, comprising the steps of applying to the substrate a base coating consisting essentially of (i) a coloring pigment and/or a metallic pigment and (ii) a vehicle component in a solvent to produce a base coat, appying a topcoating containing a hydroxyl group-containing resin and a polyisocyanate compound over the base coat, and curing the coats at a temperature range between room temperature and about 140° C., the improvement wherein the vehicle component is selected from the group consisting of: (a) a resin having a hydroxyl group and a carboxyl group in the molecule; (b) a combination of a resin having a hydroxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and an isocyanate group of the polyisocyanate compound in the topcoating; and (c) a combination of a resin having a hydroxyl group and a carboxyl group in the molecule and a catalyst for promoting the reaction between the hydroxyl group of the resin and an isocyanate group of the polyisocyanate compound in the topcoating; wherein the resin contained in the base coating has a number-average molecular weight of about 5,000 to about 100,000 when the solvent of the base coating is an organic solvent and a number-average molecular weight of about 5,000 to about 2,000,000 when the solvent of the base coating is an aqueous solvent.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein the base coating is an organic solvent based composition.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein the base coating is an aqueous solvent based composition.
Claim 5
Dependent Claim
59 words
A method according to claim 2 wherein said base coating comprises a resin having a hydroxyl group in the molecule or a resin having a hydroxyl group and a carboxyl group in the molecule, and a catalyst for accelerating the reaction between the hydroxyl group in the resin and the isocyanate group of the polyisocyanate compound in the topcoat.
Claim 6
Dependent Claim
60 words
A method according to claim 1 wherein the resin having hydroxy in the molecule or the resin having a hydroxyl group and a carboxyl group in the molecule is selected from the group consisting of acrylic resins, chlorinated polyolefin-modified acrylic resins and polyester resins, each having a hydroxyl group or a hydroxyl group and a carboxyl group in the molecule.
Claim 7
Dependent Claim
29 words
A method according to claim 1 wherein the hydroxyl group-containing resin or the hydroxyl group- and carboxyl group-containing resin has a hydroxyl value of about 5 to about 200.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein said hydroxyl value is between about 10 and about 120.
Claim 9
Dependent Claim
18 words
A method according to claim 7 wherein the hydroxyl value of the resin is between 15 and 100.
Claim 10
Dependent Claim
40 words
A method according to claim 1 wherein the base coating is an organic solvent based composition and the resin having a hydroxyl group and a carboxyl group in the molecule has an acid value of about 2 to about 30.
Claim 11
Dependent Claim
32 words
A method according to claim 1 wherein the base coating is an aqueous composition and the hydroxyl group- and carboxyl group-containing resin has an acid value of about 1 to about 200.
Claim 12
Dependent Claim
11 words
A substrate coated by the method as defined in claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |