US4413071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aqueous epoxy resin dispersions, and their use
Assignee: BASF SE
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Filing: 1981-06-15
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Granted: 1983-11-01
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Expires: 2001-06-15
Abstract
Abstract A process for the preparation of aqueous epoxy resin dispersions, wherein an epoxy resin having more than one 1,2-epoxide group per molecule is reacted with from 1 to 30% by weight, based on epoxy resin, of a protective colloid, containing basic nitrogen and having an amine number of from 10 to 90, in the presence of from 50 to 1,000 mole percent, relative to the amount of basic nitrogen in the protective colloid, of an acid, and in the presence or absence of one or more organic solvents, at from 50° to 150° C., the reaction product is dispersed by adding water, and any organic solvent present is distilled off. The novel aqueous epoxy resin dispersions are used, for example, to produce coatings.
Inventors
- 👤 Eckehardt Wistuba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:28
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08G; C08G59/00; C08G59/02; C08G59/10; C08G59/18; C08G59/40; C08G59/50; C08G59/56; C08G59/58; C08J2363/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A process for the preparation of an aqueous epoxy resin dispersion containing from 40 to 75% by weight of water, wherein (A) an epoxy resin having more than one 1,2-epoxide group per molecule is reacted with (B) from 1 to 30% by weight, based on the epoxy resin (A), of a protective colloid which contains basic nitrogen and has an amine number of from 10 to 90, said protective colloid being a copolymer which contains, as copolymerized units, vinyl propionate and vinylpyrrolidone as well as vinylimidazole, vinylpyridine or dimethylaminoethyl acrylate or methacrylate, with or without up to 35% by weight of other copolymerizable ethylenically unsaturated compounds in the presence of (C) from 50 to 1,000 mole percent, relative to the amount of basic nitrogen in the protective colloid (B), of an acid, and in the presence or absence of one or more organic solvents, at from 50° to 150° C., the reaction product is dispersed by adding water and any organic solvent present is then distilled off.
Claim 2
Dependent Claim
167 words
A process for the preparation of an aqueous epoxy resin dispersion containing from 40 to 75% by weight of water, wherein (A) an epoxy resin having more than one 1,2-epoxide group per molecule is reacted with (B) from 1 to 30% by weight, based on the epoxy resin (A), of a protective colloid which contains basic nitrogen and has an amine number of from 10 to 90, said protective colloid being a copolymer which contains, as copolymerized units, vinyl propionate and vinylpyrrolidone as well as vinylimidazole, vinylpyridine or dimethylaminoethyl acrylate or methacrylate, with or without up to 35% by weight of other copolymerizable ethylenically unsaturated compounds in the presence of (C) from 50 to 1,000 mole percent, relative to the amount of basic nitrogen in the protective colloid (B), of an acid, and in the presence or absence of one or more organic solvents, at from 50° to 150° C., the reaction product is dispersed by adding water and any organic solvent present is then distilled off.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein component (B) is a protective colloid containing basic nitrogen and having an amine number from 20 to 45.
Claim 4
Dependent Claim
21 words
The process of claim 1 or 2, wherein the protective colloid (B) has a K value of from 20 to 60.
Claim 5
Dependent Claim
34 words
The process of claim 1, wherein the protective colloid (B), containing basic nitrogen, is a copolymer which contains vinyl propionate and vinylpyrrolidone as copolymerized units in a weight ratio of from 1:8 to 8:1.
Claim 6
Dependent Claim
50 words
The process of claim 3, wherein the protective colloid (B), containing basic nitrogen, is a copolymer wherein the vinyl propionate units have been replaced at least partially by vinyl acetate units and wherein the vinylpyrrolidone units have been replaced to the extent of up to 50% by weight by vinylcaprolactam.
Claim 7
Dependent Claim
29 words
A process for the production of coatings, wherein in an aqueous epoxy resin dispersion obtained by the process set forth in claim 1 is used as the coating 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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |