C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/7416
C08G 18/42 (2006.01) C08G 18/36 (2006.01) C08G 18/58 (2006.01) C08G 18/64 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08G 59/02 (2006.01) C08G 59/42 (2006.01) C08G 59/62 (2006.01)
Patent
CA 1242828
86 ABSTRACT OF THE DISCLOSURE Novel solvent based, thermosetting coating com- positions comprising epoxy ester resin and blocked polyiso- cyanate crosslinking agent. The epoxy ester resin used in the composition has a number average molecular weight (Mn) of about 900 to about 5000 and is the reaction product of diepoxide, for example bisphenol-A epichlorohydrin epoxy resin, with (i) diphenol, for example bisphenol A, in chain extension reaction, (ii) dicarboxylic acid, for example the dimer acid reaction product of the dimerization of C-18 fatty acid, in chain extension reaction and (iii) fatty acid, for example Soya fatty acid, in chain terminating esterification reaction, which chain extension reaction and esterification reaction occur at least in part substantially simultaneously and at a temperature reaching at least about 135°C. (275°F). The blocked polyisocyanate crosslinking agent comprises at least one isocyanato group which has been blocked by reaction with an active hydrogen bearing blocking agent and is included in an amount sufficient to provide about 0.5 to about 1.6 reactive isocyanato groups per reac- tive group on the epoxy ester resin upon deblocking during cure.
437982
Kordomenos Panagiotis I.
Kurple Kenneth R.
Ford Motor Company Of Canada Limited
Sim & Mcburney
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