C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/4703, 204/97
C09D 4/00 (2006.01) C08G 59/06 (2006.01) C08G 59/14 (2006.01) C08G 59/22 (2006.01) C09D 5/44 (2006.01) C09D 101/00 (2006.01) C09D 163/00 (2006.01) C09D 201/00 (2006.01)
Patent
CA 1277059
ABSTRACT A method for preparing an advanced epoxy cationic resin from an epoxy-based resin containing oxirane groups by converting at least some of the oxirane groups to cationic groups, wherein the improve- ment is using as the epoxy-based resin a blend of (I) an epoxy-based resin obtained by reacting in the presence of a suitable catalyst (1) a diglycidylether of a polyetherpolyol, such as a condensation product of dipropylene glycol and epichlorohydrin having an epoxy equivalent weight of 185, optionally (2) a diglycidyl- ether of a dihydric phenol, for example a diglyoidyl ether of bisphenol A, (3) a dihydric phenol such as bisphenol A, and optionally (4) a capping agent such as p-nonylphenol and (II) a different cationic epoxy-based resin. Such resin blends can be utilized in cathodic electrodeposition coating systems. Use of the diglycidylether of a polyetherpolyol provides coating compositions with lower viscosity and produces deposition coatings of higher film build than compositions without this component.
542151
Hickner Richard A.
Mcintyre John M.
Rao Nancy A.
Smart & Biggar
The Dow Chemical Company
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