C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/04 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/62 (2006.01) C09D 167/00 (2006.01)
Patent
CA 2235077
The invention concerns a coating agent which comprises at least three components (I), (II) and (III) and is characterized in that component (I), as binder (A), contains at least one acrylate copolymer (A1) which is dissolved or dispersed in an organic optionally water-dilutable solvent and has a number average molecular weight Mn of between 1000 and 30 000 Dalton, an OH number of between 40 and 200 and an acid number of between 5 and 150, and/or a polyester resin (A2) which is dissolved or dispersed in an organic optionally water- dilutable solvent and has a number average molecular weight Mn of between 1000 and 30 000 Dalton, an OH number of between 30 and 250 and an acid number of between 5 and 150, and/or a polyurethane resin (A3) which is dissolved or dispersed in an organic optionally water-dilutable solvent and has a number average molecular weight Mn of between 1000 and 30 000 Dalton, an OH number of between 20 and 200 and an acid number of between 5 and 150, and/or optionally a further binder (A4), the binder components being selected such that a 50 % solution of binder (A) in ethoxyethylpropionate has a viscosity of = 6.0 dPA.s at 23 ~C. The coating agent according to the invention is further characterized in that component (II) contains at least one non-blocked polyisocyanate as crosslinking agent; and in that component (III) contains components (A1) and/or (A2) and/or (A3) and/or (A4) in an aqueous dispersion.
L'invention concerne un agent de recouvrement composé d'au moins trois constituants (I), (II) et (III), qui se caractérise en ce que le constituant (I) contient comme liant (A), au moins un copolymérisat acrylate (A1) dispersé ou dissous dans un solvant organique, éventuellement diluable dans l'eau, et dont le poids moléculaire moyen en nombre Mn se situe entre 1000 et 30000 Dalton, son indice d'hydroxyle étant compris entre 40 et 200 et son indice d'acide, entre 5 et 150, et/ou une résine polyester (A2) dispersée ou dissoute dans un solvant organique, éventuellement diluable dans l'eau, dont le poids moléculaire moyen en nombre Mn se situe entre 1000 et 30000 Dalton, son indice d'hydroxyle étant compris entre 30 et 250 et son indice d'acide, entre 5 et 150, et/ou une résine polyuréthane (A3) dispersée ou dissoute dans un solvant organique, éventuellement diluable dans l'eau, dont le poids moléculaire moyen en nombre Mn se situe entre 1000 et 30000 Dalton, son indice d'hydroxyle étant compris entre 20 et 200 et son indice d'acide entre 5 et 150, et/ou éventuellement un autre liant (A4). Les constituants liants sont sélectionnés de manière qu'une solution à 50 % du liant (A) dans l'éthoxyéthylpropionate présente une viscosité de ? = 6,0 dPa.s à 23 ·C. L'agent de recouvrement se caractérise également en ce que le constituant (II) contient comme réticulant au moins un polyisocyanate non bloqué, et que le constituant (III) contient les constituants (A1) et/ou (A2) et/ou (A3) et/ou (A4) en dispersion aqueuse.
Mayer Bernd
Meisenburg Uwe
Nienhaus Egbert
Rink Heinz-Peter
Basf Coatings Aktiengesellschaft
Fetherstonhaugh & Co.
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