US5468461A
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Anticorrosive primer composition
Assignee: Nippon Paint Co Ltd
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Filing: 1994-08-25
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Granted: 1995-11-21
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Expires: 2014-08-25
Abstract
Abstract An anticorrosive primer composition comprises (1) 100 parts by weight of an epoxy resin having a number-average molecular weight of from 500 to 10,000, (2) from 10 to 60 parts by weight of an aromatic polyamine containing from 2% to 30% by weight, based on the aromatic polyamine, of a promoter selected from the group consisting of phenol compounds and cresol compounds, (3) from 10 to 60 parts by weight of a polyisocyanate, (4) from 10 to 40 phr, based on the sum of components (1), (2), and (3), of silica particles of colloidal silica or fumed silica or a mixture of these, (5) from 0.5 to 5 phr of a lubricant, and (6) an organic solvent. The composition is particularly suitable for use to apply onto the chromate coating of a chromated, zinc-plated steel sheet.
Inventors
- 👤 Yasushi Hosoda
- 👤 Toshiaki Shiota
- 👤 Nobukazu Suzuki
- 👤 Satoshi Ikeda
- 👤 Taketosi Odawa
- 👤 Koichi Kimura
- 👤 Hisataka Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:01
CPC Classifications
C; C09; C09D; C09D163/00; C09D175/00; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/58; C08G18/584; C08K; C08K3/00; C08K3/34; C08K3/36; C08K9/00; C08K9/04; C08K9/06; C09D179/00; C09D179/02; C09D5/00; C08G2150/00; C08G2150/90
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
182 words
An anticorrosive primer composition comprising: (1) 100 parts by weight of an epoxy resin having a number-average molecular weight of from 500 to 10,000, wherein the epoxy resin is selected from the group consisting of glycidyl ethers, glycidyl esters, glycidylamines, linear aliphatic or alicyclic epoxides, and acrylate-modified epoxy resins or urethane-modified epoxy resins, (2) from 10 to 60 parts by weight of an aromatic polyamine having at least two primary or secondary amine groups and containing from 2% to 30% by weight, based on the aromatic polyamine, of a promoter selected from the group consisting of phenol compounds and cresol compounds, (3) from 10 to 60 parts by weight of a polyisocyanate which is non-blocked or blocked with a blocking agent having a release-initiating temperature of below 160° C., (4) from 10 to 40 phr, based on the sum of components (1), (2), and (3), of silica particles of colloidal silica or fumed silica or a mixture of these, (5) from 0.5 to 5 phr, based on the sum of components (1), (2), and (3), of a lubricant, and an organic solvent.
Claim 2
Dependent Claim
182 words
An anticorrosive primer composition comprising: (1) 100 parts by weight of an epoxy resin having a number-average molecular weight of from 500 to 10,000, wherein the epoxy resin is selected from the group consisting of glycidyl ethers, glycidyl esters, glycidylamines, linear aliphatic or alicyclic epoxides, and acrylate-modified epoxy resins or urethane-modified epoxy resins, (2) from 10 to 60 parts by weight of an aromatic polyamine having at least two primary or secondary amine groups and containing from 2% to 30% by weight, based on the aromatic polyamine, of a promoter selected from the group consisting of phenol compounds and cresol compounds, (3) from 10 to 60 parts by weight of a polyisocyanate which is non-blocked or blocked with a blocking agent having a release-initiating temperature of below 160° C., (4) from 10 to 40 phr, based on the sum of components (1), (2), and (3), of silica particles of colloidal silica or fumed silica or a mixture of these, (5) from 0.5 to 5 phr, based on the sum of components (1), (2), and (3), of a lubricant, and an organic solvent.
Claim 3
Dependent Claim
17 words
The anticorrosive primer composition of claim 1, wherein the epoxy resin is a glycidyl ether epoxy resin.
Claim 4
Dependent Claim
21 words
The anticorrosive primer composition of claim 1, wherein the epoxy resin has a number-average molecular weight in the range of 1,000-5,000.
Claim 5
Dependent Claim
28 words
The anticorrosive primer composition of claim 1, wherein the promoter is present in an amount of 5% to 25% by weight based on the weight of the polyamine.
Claim 6
Dependent Claim
25 words
The anticorrosive primer composition of claim 1, wherein the promoter-containing aromatic polyamine is present in an amount of from 20 to 45 parts by weight.
Claim 7
Dependent Claim
23 words
The anticorrosive primer composition of claim 1, wherein the polyisocyanate is present in an amount of from 20 to 45 parts by weight.
Claim 8
Dependent Claim
22 words
The anticorrosive primer composition of claim 1, wherein the silica particles are present in an amount of from 15 to 30 phr.
Claim 9
Dependent Claim
14 words
The anticorrosive primer composition of claim 1, wherein the silica particles are colloidal silica.
Claim 10
Dependent Claim
18 words
The anticorrosive primer composition of claim 1, wherein the silica particles are surface-modified by treatment with an alcohol.
Claim 11
Dependent Claim
21 words
The anticorrosive primer composition of claim 1, wherein the lubricant is present in an amount of from 1 to 4 phr.
Claim 12
Dependent Claim
34 words
The anticorrosive primer composition of claim 1, wherein the lubricant is selected from the group consisting of polyethylene waxes, carboxylate ester waxes, polyalkylene glycol waxes, silicone resins, fluorinated resins, melamine-cyanurate adducts and mixtures thereof.
Claim 13
Dependent Claim
23 words
The anticorrosive primer composition of claim 11, wherein the lubricant is a polyethylene wax or a melamine-cyanurate adduct or a mixture of these.
Claim 14
Dependent Claim
24 words
The anticorrosive primer composition of claim 1, wherein the organic solvent is selected from the group consisting of ketones, hydrocarbons, alcohols, ethers, and esters.
Claim 15
Dependent Claim
32 words
The anticorrosive primer composition of claim 1, which further comprises one or more additives selected from the group consisting of anticorrosive pigments, color pigments, surface modifiers, antisagging agents, dispersants, and thickening agents.
Claim 16
Dependent Claim
22 words
The anticorrosive primer composition of claim 14, wherein the composition comprises an anticorrosive pigment in an amount of 1 to 10 phr.
Claim 17
Dependent Claim
24 words
The anticorrosive primer composition of claim 1, wherein the polyisocyanates are blocked with a blocking agent having a release-initiating temperature of below 160° C.
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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) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |