US4446260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water dilutable epoxy coating composition
Assignee: PPG Industries Ohio Inc
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Filing: 1982-06-29
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Granted: 1984-05-01
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Expires: 2002-06-29
Abstract
Abstract A water dispersible coating composition is prepared by reacting together at elevated temperature in the presence of an amine 40 to 90% by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and 10 to 60% by weight of a polymer containing carboxylic acid groups. The ratio of carboxylic acid groups to epoxide groups is 1.5:1 to 20:1. The reaction is carried out in a mixture of a water miscible organic solvent with 5 to 30% of water based on the combined weight of epoxy resin and polymer containing carboxylic acids groups. A coating composition in the form of a stable dispersion is produced by mixing the water dispersible coating composition prepared as described above with a base and sufficient water to form a predominantly aqueous continuous phase.
Inventors
- 👤 Richard A. Woods
- 👤 Rajesh R. Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:06
CPC Classifications
C; C09; C09D; C09D163/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A process for preparing a water dispersible coating composition comprising: (A) reacting together at elevated temperature (a) 40-90 percent by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and average molecular weight 2000 to 12,000 and (b) 10-60 percent by weight of a polymer containing carboxylic acid groups which is an addition copolymer of 10-85 percent by weight of an olefinically unsaturated carboxylic acid and 90-15 percent by weight of at least one olefinically unsaturated comonomer, the ratio of carboxylic acid groups in (b) to epoxide groups in (a) being from 1.5:1 to 20:1, and (B) carrying out said reaction in the presence of 0.5 to 3.0 percent by weight of an amine in a mixture of a water miscible organic solvent with 5 to 30 percent by weight of water, the percentages of amine and of water being based on the combined weight of epoxy resin (a) and copolymer (b).
Claim 2
Dependent Claim
160 words
A process for preparing a water dispersible coating composition comprising: (A) reacting together at elevated temperature (a) 40-90 percent by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and average molecular weight 2000 to 12,000 and (b) 10-60 percent by weight of a polymer containing carboxylic acid groups which is an addition copolymer of 10-85 percent by weight of an olefinically unsaturated carboxylic acid and 90-15 percent by weight of at least one olefinically unsaturated comonomer, the ratio of carboxylic acid groups in (b) to epoxide groups in (a) being from 1.5:1 to 20:1, and (B) carrying out said reaction in the presence of 0.5 to 3.0 percent by weight of an amine in a mixture of a water miscible organic solvent with 5 to 30 percent by weight of water, the percentages of amine and of water being based on the combined weight of epoxy resin (a) and copolymer (b).
Claim 3
Dependent Claim
39 words
A process according to claim 1, wherein said reaction is carried out in a mixture of a water miscible organic solvent with 5 to 20% of water, based on the combined weight of epoxy resin (a) and copolymer (b).
Claim 4
Dependent Claim
35 words
A process according to claim 1 or claim 2, wherein the amount of amine present during the reaction is 1.0 to 2.0% based on the combined weight of the epoxy resin (a) and copolymer (b).
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein the amine is a tertiary amine.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the epoxy resin (a) contains aromatic groups joined together by ether linkages.
Claim 7
Dependent Claim
31 words
A process according to claim 1, wherein the ratio of carboxylic acid groups in the polymer containing carboxylic acid groups to epoxide groups in the epoxy resin is 2:1 to 10:1.
Claim 8
Dependent Claim
39 words
A process according to claim 1, further comprising: (C) mixing the water dispersible coating composition produced by (A) and (B) with a base and sufficient water to form a predominantly aqueous continuous phase, whereby a stable dispersion is formed.
Claim 9
Dependent Claim
13 words
A process according to claim 7, wherein said base is a tertiary amine.
Claim 10
Dependent Claim
44 words
A process according to claim 7 or claim 8, wherein the amount of base used is sufficient to neutralize 40 to 130% of the free carboxylic acid groups in the reaction product of the epoxy resin composition and the polymer containing carboxylic acid groups.
Claim 11
Dependent Claim
27 words
A process according to claim 7, further comprising: (D) at least partially removing said organic solvent used in the preparation of the coating composition from the composition.
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |