C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4703, 204/97
C08L 63/00 (2006.01) C08G 59/06 (2006.01) C08G 59/14 (2006.01) C08G 59/16 (2006.01) C08G 59/18 (2006.01) C08G 59/22 (2006.01) C09D 5/44 (2006.01) C09D 163/00 (2006.01)
Patent
CA 1281458
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 is improved by 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 an aliphatic diol which diol is essentially free of ether oxygen atoms, such as a condensation product of 1,4-butanediol and epichlorohydrin, optionally (2) a diglycidylether of a dihydric phenol, for example a diglycidyl ether of bisphenol A, (3) a dihydric phenol such as bisphenol A, and optionally (4) a capping agent such as p-nonyl- phenol and (II) a different cationic epoxy-based resin. Such resin blends can be utilized in cathodic electrodeposition coating systems. Use of the diglycidylether of an aliphatic diol which diol is essentially free of ether oxygen atoms provides coating compositions with lower viscosity and produces deposition coatings of higher film build than compositions without this component.
542152
Hickner Richard A.
Rao Nancy A.
Hickner Richard A.
Rao Nancy A.
Smart & Biggar
The Dow Chemical Company
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