Pyridinium-modified epoxy resins suitable for use in...

Details Pyridinium-modified epoxy resins suitable for use in... Pyridinium-modified epoxy resins suitable for use in...

C - Chemistry, Metallurgy

07

D

402/270, 400/512

C07D 213/62 (2006.01) C08G 18/08 (2006.01) C08G 18/50 (2006.01) C08G 18/80 (2006.01) C08G 59/14 (2006.01) C08G 85/00 (2006.01) C09D 5/44 (2006.01)

Patent

CA 1138463

ABSTRACT OF THE DISCLOSURE Water-compatible compositions are described comprising at least one resinous compound whose backbone is linear and contains at least one oxyaryleneoxyalkylene or oxyaryleneoxy(1,3-(2-hydroxy)alkylene) unit and which bears at least two functional organic moieties through which cross-linking can occur (preferably groups having active hydrogen and/or blocked isocyanato groups, more preferably aliphatic hydroxyl groups) and at least one terminal pyridinium nitrogen atom. These compositions when mixed with water have a pH below 10. The compositions are useful coating compositions which find particular utility in cathodic electrodeposition. The compositions are prepared, for example, by reacting a linear epoxy resin with a pyridine in the presence of sufficient amount of a Bronsted acid and water to stabilize the pyridinium salt thus formed. Blocked isocyanates are compatible cross-linkers with the new resinous compositions.

344306

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