C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
402/134, 402/192
C25D 13/06 (2006.01) C08G 59/02 (2006.01) C08G 59/14 (2006.01) C08G 59/56 (2006.01) C08G 59/62 (2006.01) C09D 5/44 (2006.01)
Patent
CA 1217596
Abstract Water-dispersible binders for cationic electropaints, and a process for their preparation The invention relates to water-dispersible binders which are intended for cationic electropaints and are based on reaction products which are formed from modified epoxy resins and primary and/or secondary amines and which can, if desired, also contain crosslinking agents, pig- ments, flow-control agents and other customary auxiliaries. The reaction products have been prepared by reacting (A) low molecular weight epoxy resins which contain aro- matic groups and have an epoxide equivalent weight of less than 375 with (B) aliphatic and/or alicyclic polyfunctional alcohols or carboxylic acids having a molecular weight of less than 350 by addition to the epoxy group in such a way that the reaction products contain 10-45% of aromatic groups, calculated as phenylene group, and reacting the reaction products of A and B with (C) if desired up to 60X by weight, relative to total binder, of polyfunctional alcohols, carboxylic acids and/or SH compounds having a molecular weight of 300-5,000, the molar ratios of (A), (B) and, if desired, (C) being chosen in such a way that the resulting intermediate product has terminal epoxy groups, (D) by reacting the intermediate product by the addition of a phenolic hydroxyl group of a monophenol and/or diphenol to the epoxy groups, the monophenol or diphenol having as a substituent on the aromatic ring(s) at least one grouping of the general formula (I) - CH2 - NH - Image - CR1 = CHR2 in which R1 and R2 are identical to or different from one another and represent hydrogen or a methyl group, and by adding a primary and/or secondary amine before or after the reaction of the phenolic hydroxyl groups with the epoxy groups, to a least some of the double bonds of the grouping of the formula (I).
423935
Batzill Wolfgang
Diefenbach Horst
Geist Michael
Schupp Eberhard
Basf Farben + Fasern Aktiengesellschaft
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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