US4229495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating method and article produced thereby
Assignee: Sekisui Chemical Co Ltd
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Filing: 1978-12-20
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Granted: 1980-10-21
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Expires: 1998-12-20
Abstract
Abstract A primer coating composition comprising (1) a mixture of more than 50% by weight of aluminum powder and less than 50% by weight of zinc powder, and (2) at least one C 1-4 -alkyl silicate, the weight ratio of (1) to (2) being 60:40 to 95:5. The composition is employed in a coating method which comprises applying a primer dispersion to the surface of a substrate to be coated. The primer disbersion is a dispersion of a mixture of more than 50% by weight of aluminum powder and less than 50% by weight of zinc powder in a solution of at least one organic solvent-soluble C 1-4 -alkyl silicate in an organic solvent. The weight ratio of the metal powder to the alkyl silicate is as indicated. The coating is baked and a finishing powder paint is coated on the resulting primer. The finished coating is then baked.
Inventors
- 👤 Minoru Takahashi
- 👤 Osamu Ishii
- 👤 Masanori Naito
- 👤 Yoshinobu Kusuhara
- 👤 Naofumi Imahigashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/10; C09D183/00; C09D183/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A coating method which comprises applying a primer dispersion to the surface of a metallic substrate to be coated, the primer dispersion being a dispersion of a mixture of aluminum powder and zinc powder the weight ratio of the aluminum powder to the zinc powder being 95:5 to 70:30 in a solution of at least one organic solvent-soluble C 1-4 -alkyl silicate in an organic solvent, the weight ratio of the metal powder to the alkyl silicate being 60:40 to 95:5; baking the coating; coating a finishing powder paint on the resulting primer; and then baking the finish coating.
Claim 2
Dependent Claim
99 words
A coating method which comprises applying a primer dispersion to the surface of a metallic substrate to be coated, the primer dispersion being a dispersion of a mixture of aluminum powder and zinc powder the weight ratio of the aluminum powder to the zinc powder being 95:5 to 70:30 in a solution of at least one organic solvent-soluble C 1-4 -alkyl silicate in an organic solvent, the weight ratio of the metal powder to the alkyl silicate being 60:40 to 95:5; baking the coating; coating a finishing powder paint on the resulting primer; and then baking the finish coating.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein the aluminum powder is granular and has an average particle diameter of not more than 150 microns, and the zinc powder is granular and has an average particle diameter of not more than 50 microns.
Claim 4
Dependent Claim
35 words
The method of claim 2 wherein the aluminum powder has an average particle diameter of not more than 50 microns, and the zinc powder has an average particle diameter of not more than 10 microns.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the weight ratio of the aluminum powder to the zinc powder is 95:5 to 80:20.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the weight ratio of the metal powder to the alkyl silicate is 80:20 to 95:5.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the alkyl silicate is a condensate obtained by partial hydrolysis of a tetraalkyl silicate.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the tetraalkyl silicate is tetracethyl silicate.
Claim 9
Dependent Claim
44 words
The method of claim 1 wherein the organic solvent is at least one member selected from the group consisting of C 1 -C 4 aliphatic alcohols, aliphatic ketones containing C 1 -C 4 alkyl groups and ethylene glycol mono-C 1 -C 4 alkyl ethers.
Claim 10
Dependent Claim
47 words
The method of claim 1 wherein the coating dispersion further contains a silica powder or alumina powder having an average particle diameter of not more than 5 microns in an amount of up to 5 parts by weight per 100 parts by weight of the metal powder.
Claim 11
Dependent Claim
27 words
The method of claim 1 wherein the baking of the coating dispersion is performed at a temperature of at least 300° C., preferably 350° to 420° C.
Claim 12
Dependent Claim
37 words
The method of claim 10 wherein the powder paint is a powder paint consisting mainly of a polyphenylene sulfide resin, and the baking of the powder paint is performed at a temperature of 300° to 450° C.
Claim 13
Dependent Claim
35 words
The method of claim 11 wherein the surface of the metallic substrate to be coated is the inner surface of a pipe, pipe fitting or a valve made of steel, cast iron or stainless steel.
Claim 14
Dependent Claim
10 words
An metallic article coated by the method of claim 1.
Claim 15
Dependent Claim
18 words
A pipe, pipe fitting or a valve whose inside surface is coated by the method of claim 12.
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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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |