Abstract The present invention relates to a process for the manufacture of thermosetting synthetic resins with urethane groups, which contain carboxyl groups and masked isocyanate groups and can be diluted with water, and which are manufactured by reaction of a compound (a) which contains alcoholic hydroxyl groups and carboxyl groups, with a masked isocyanate (b) in inert organic solvents. The present invention also relates to the use of the synthetic resins manufactured according to the invention as binders in coating agents for electrophoretic lacquering. The following advantages are achieved by the process of the present invention: Binders which can be diluted with water and are suitable for the electrophoretic coating process are obtained, which are distinguished by very good throwing power and by very good resistance of the stoved films to washing lyes or aqueous sodium chloride solution at 0* to 100*C.
Process according to claim 1 wherein component (a) comprises copolymers of 4-20 percent of acrylic acid, methacrylic acid or mixtures of acrylic acid and methacrylic acid, 40-70 percent of plasticizing copolymerized monomers selected from the group consisting of alkyl acrylates or alkyl methacrylates in which the alkyl radical contains 4 to 12 carbon atoms, and optionally 5-35 percent of styrene, vinyltoulene or acrylonitrile, 8 to 15 percent of hydroxyalkyl acrylate being contained in the acrylate or methacrylate copolymer, said hydroxyalkyl acrylate or methacrylate being defined by the general formula:
Claim 2
Dependent Claim
40 words
Process according to claim 2 wherein the plasticizing copolymerized monomers includes an allyl compound selected from the group consisting of allyl alcohol, allyloxy propanol, trimethyl propane diallyl ether, pentaerythritol triallyl ether in place of the hydroxyalkyl acrylate or methacrylate component.
Claim 3
Dependent Claim
30 words
Process according to claim 2 wherein the plasticizing monomer is a vinyl ester of an Alpha -alkylalkane monocarboxylic acid which is a mixture of C9-, C10- and C11- monocarboxylic acids.
Claim 4
Dependent Claim
33 words
Process according to claim 1 wherein the masked polyisocyanates are mixtures of 65-80 percent by weight of 2,4-toluylene diisocyanate or hexamethylene diisocyanate and 35-20 percent by weight of 2,6-toluylene diisocyanate or hexamethylene diisocyanate.
Claim 5
Dependent Claim
18 words
Process according to claim 1 wherein the masked polyisocyanates employed contain phenol or epsilon -caprolactam as masking component.
Claim 6
Dependent Claim
12 words
A thermosetting synthetic resin produced according to the process of claim 1.
Claim 7
Dependent Claim
29 words
A process according to claim 1 wherein the esters of the fatty acids are with polyols which contain more than 3 but at most 6 hydroxyl groups per molecule.