C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/194
C08G 63/91 (2006.01) C09D 163/00 (2006.01) C09D 167/00 (2006.01)
Patent
CA 1291290
Abstract: Water-dilutable coating compositions for the production of heat-curable coatings The invention relates to water-dilutable coating compo- sitions for the production of heat-curable coatings, in which the binders are composed, at least in part, of an epoxide resin-modified, water-dilutable polyester. The water-dilutable coating compositions according to the in- vention are characterized in that the epoxide resin-modi- fied, water-dilutable polyester has been prepared by (A) synthesizing a polyester from (a1) at least one polycarboxylic acid containing at least three carboxyl groups, or a reactive derivative of this acid, and/or (a2) at least one polyol containing at least one carboxyl group and (a3) at least one polycarboxylic acid containing two carboxyl groups, or a reactive derivative of this acid, and (a4) at least one polyol, at least 10 mol%, preferably 30-70 mol%, of the components (a1), (a2), (a3) and (a4) employed containing (relative to (a1) + (a2) + (a3) + (a4) = 100 mol%) at least one (cyclo)- aliphatic structural element containing at least six C atoms, the polyester having an average molecular weight (num- ber average) less than 2,000, preferably 500 to 1,500, an acid number from 35 to 240 preferably 50 to 120, and an OH number from 56 to 320, preferably 80 to 200, and all the (a1) and (a3) components in the polyester being co-condensed via at least two carboxyl groups, and (B) subsequently reacting the polyester thus obtained with 0.3 to 1.5, preferably 005 to 1.0, equivalents per polyester molecule of an epoxide resin having an epoxide equivalent weight of 170 to 1,000, preferably 170 to 500, and based on a bisphenol, preferably bis- phenol A, and/or with a derivative of this epoxide resin containing at least one epoxide group per mole- cule, under reaction conditions in which essentially only carboxyl groups react with epoxide groups, to give an epoxide resin-modified polyester which, after at least part of the free carboxyl groups have been neutralized, is present in a water-dilutable form.
550049
Hille Dieter
Lutz-Werner Groß
Poth Ulrich
Weidemeier Klaus
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
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