Process for producing self-crosslinking cathodically...

Details Process for producing self-crosslinking cathodically... Process for producing self-crosslinking cathodically...

C - Chemistry, Metallurgy

08

G

402/40

C08G 8/00 (2006.01) C08G 14/00 (2006.01) C08G 16/00 (2006.01) C08G 18/54 (2006.01) C09D 5/44 (2006.01)

Patent

CA 1213392

ABSTRACT OF DISCLOSURE Cathodically depositable self-crosslinking binders for electrodeposition based on alkylphenol novolaks wherein an alkyl- phenol novolak having a molecular weight of at least 500 and a hydroxyl value of between 100 and 700 mg KOH/g, modified through self-condensation or etherification of the phenolic hydroxy groups, obtained through a reaction catalyzed with an acid (com- ponent A), is reacted simultaneously or separately with (B) amines which carry a tertiary amino group and at least one hydroxy group and/or a primary or secondary amino group (component B) and (C) aromatic and/or aliphatic and/or cycloaliphatic di- or polyiso- cyanates (component C), the weight ratio of components being chosen in order that for each mole of component (B) 2 to 4 NCO- equivalents of component (C) are present and that the resultant isocyanate-group-free reaction product has an amine value of between 40 and 120 mg KOH/g is described. The binders are inter- nally platicized to provide increased flexibility of coatings prepared from the binders which are essentially chip resistant.

449979

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