Binders for cathodic electrocoating

Details Binders for cathodic electrocoating Binders for cathodic electrocoating

C - Chemistry, Metallurgy

09

D

400/5124

C09D 5/44 (2006.01) C08G 59/50 (2006.01) C08G 59/58 (2006.01)

Patent

CA 1263982

O.Z. 0062/02060 Abstract of the Disclosure: Binders for cathodic elec- trocoating which are based on polyadducts/polycondensates which carry basic nitrogen groups and are rendered water- dilutable by protonation with an acid, and one or more crosslinking agents for these polyadducts/polycondensates, their use and electrocoating baths prepared from them. These binders essentially consist of a mixture of (A) from 50 to 90% by weight of a polyadduct/polyconden- sate which carries basic nitrogen groups and is ob- tainable by reacting (a) an essentially epoxide-free adduct of a secondary amine and polyepoxide compound with (b) a condensate of a diamine/polyepoxide adduct which is prepared in the presence of excess di- amine and separated off from excess diamine after complete conversion of the epoxide groups with one or more mono- and/or dicarboxylic acids of not less than 6 carbon atoms. (B) from 10 to 50% by weight of a crosslinking agent which does not react with component (A) at room tem- perature but reacts with the latter at elevated temp- peratures with crosslinking. These binders are particularly useful for the cathodic electrocoating of electrically conductive substrates.

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