Process for the production of self-cross-linking lacquers

Details Process for the production of self-cross-linking lacquers Process for the production of self-cross-linking lacquers

C - Chemistry, Metallurgy

09

D

117/183, 400/521

C09D 7/14 (2006.01) C08F 2/16 (2006.01) C08L 57/00 (2006.01) C09D 157/06 (2006.01)

Patent

CA 1052029

ABSTRACT Thc process for preparing a lacquer utilizing an aqueous dispersion, the lacquer being pigmented or non-pigmented, being self-cross linking upon heat treatment and containing a binder consisting essentially of the following monomers: (a) 30 to 70 parts by weight of at least one monomer whose hcmopolymer has a theoretical glass temperature of less than 10°C., based on the total weight of the binder, (b) 30 to 70 parts by weight of at least one monomer whose homopolymer has a theoretical glass temperature of more than 30°C., ba~ed upon the total weight of the binder, (c) 0.5 and 5 parts by weight of at least one polymerizable acid and/or salt thereof, baxed upon the total weight of the binder, (d) 2 to 35 parts by weight of at least one reactive monomer, based upon the total weight of the binder, and (e) 0.5 to 35 parts by weight of at least one alkali or ammonium salt of a polymerizable sulfonic acid com- pound,based upon the total weight of the binder. The process involves conducting the polymerization in an aqueous dispersion in a reaction vessel at a preselected temperature between 15° and 30°C. and at a starting pH of 3 to 4 in the presence of a redox system consisting of 0.005 to 0.5 percent by weight of at least one alkali and/or ammonium persulfate, based upon the total weight of the monomers, 0.001 to 0.5 percent by weight of ascorbic acid. based upon the total weight of the monomers, and 10 to 30 p.p.m. of at least one iron (II)-salt based upon the total weight of the monomers. No more than 30 percent of the monomers and the majority (at least 50 percent) of the persulfate are inserted into the reaction vesnel before the polymerization step starts. After the polymerization step starts, the remaining amount of monomers are dosed into the reaction vessel concurrently and parallel with the iron (II)-salt and the ascorbic acid in such a manner that the preselected polymerization temperature remains almost constant. -2-

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