Claims
- 1. Process for preparing cathodically depositable paint binders based on modified epoxy resin/amine adducts, comprising
- (A) reacting a diprimary aliphatic polyamine with an aliphatic monoglycidyl and/or monoepoxide compound the aliphatic group of which contains 8 to 20 carbon atoms, at 40.degree. C. to 60.degree. C. in the presence of a solvent inert in the reaction, in quantities such that the reaction product has two secondary amino groups,
- (B) reacting 2 mol of intermediate product (A) above at 40.degree. C. to 80.degree. C. with 1 mol of a diglycidyl compound to produce modifier (A) and
- (C) reacting 5% to 30% by weight, based on the modified epoxy resin/amine adduct, of said modifier (AB), which contains, per molecule, two secondary amino groups and has a glass transition temperature of less than about -15.degree. C., with polyepoxy resins, at least one member selected from the group consisting of a primary alkylamine, secondary dialkylamine, primary alkanolamine and secondary dialkanolamine; and a primary-tertiary alkyldiamine to form an epoxy resin/amine adduct which is free from epoxide groups and water-dilutable after neutralization with acids and has a molecular weight of 4,000 to 16,000 (weight method) or 1,500 to 3,000 (counting method), a glass transition temperature of 20.degree. C. to +45.degree. C., and an amine number of at least 20 mg KOH/g.
- 2. The process according to claim 1 wherein said polyamine in step (A) is a diamine.
- 3. The process according to claim 1 or 2 wherein from 10% to 20% by weight of modifier (AB) is utilized.
- 4. The process according to claim 1 or 2 or 3 wherein said polyepoxy resin is a diepoxy resin.
- 5. The process according to claim 1 wherein diethylenetriamine is used as the diprimary aliphatic polyamine.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2046/88 |
Aug 1989 |
ATX |
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Parent Case Info
This is a division of application Ser. No. 07/395,514 filed Aug. 18, 1989, now U.S. Pat. No. 4,992,516.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
395514 |
Aug 1989 |
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