B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/147, 400/400
B32B 15/08 (2006.01) B05D 7/00 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C09D 5/44 (2006.01) C09D 175/04 (2006.01)
Patent
CA 1224586
ABSTRACT OF THE DISCLOSURE The invention relates to a water-dilutable coating agent for preparing the base layer of a multilayer coating and which contains pigments and, if desired, flow-control agents, thixotroping agents, fillers, organic solvents and other custom- ary auxiliaries. The coating agent contains as a binder an aqueous polyurethane dispersion which has a polyurethane resin acid number of 5 to 70 and which has been prepared by reacting (A) a linear polyether diol and/or polyester diol having terminal hydroxyl groups and a molecular weight of 400 to 3,000 with (B) a diisocyanate in such a molar ratio that an inter- mediate product is formed which has terminal isocyanate groups, (C) and reacting the intermediate product with a compound which has two groups which are reactive toward isocyanate groups and at least one group which is capable of forming an anion and which has been neutralized with a tertiary amine before the reaction, converting the second intermediate product, obtained from (A), (B) and (C), into a predominantly aqueous phase and (D) reacting the isocyanate groups which are still present with a diamine and/or polyamine having primary and/or secondary amine groups. The binders according to the invention give, in particular when metallic pigments are used, coatings which have a particularly good metallic effect, since they lead to a very favourable arrangement and fixation of the metallic pigments in the paint film. Even when conventional, non-metallic, pig- ments are used coatings are obtained which have an excellent decorative effect. The coating agents have a particular ad- vantage in that on application of a further coating layer to the predried but not yet baked film they dissolve only to a very small extent or, in some cases, not at all.
424071
Drexler Hermann-Josef
Ebner Franz
Hille Hans-Dieter
Poth Ulrich
Basf Farben Fasern Akiengesellschaft
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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