Method for producing coatings from coating materials that...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 133/10 (2006.01) B05D 3/02 (2006.01) B05D 3/06 (2006.01) C08G 18/62 (2006.01) C08G 18/81 (2006.01) C09D 133/06 (2006.01) C09D 175/16 (2006.01) B05D 3/04 (2006.01) B05D 7/00 (2006.01)

Patent

CA 2440913

The invention relates to a method for producing coatings, according to which (I) coating materials are applied to substrates or to uncured, partially cured and/or completely cured lacquer layers present thereon, and (II) the resulting layers of coating materials are cured separately or together with the lacquer layers by means of heat and actinic radiation. (1) The curing with actinic radiation is carried out in an oxygen-depleted atmosphere and (2) the coating materials contain (A) (meth)acrylate copolymers having an OH number of 100 to 220 mg KOH/g, a glass transition temperature of 35 to +60 ~C, a number-average molecular weight of from 1000 to 10000 Dalton and a mass-average molecular weight of from 2000 to 40000 Dalton and that further contain an amount of hydroxyl-group containing monomers (a) polymerized into them that corresponds to the OH number. (a1) 20 to 90 % by weight based on (a) of said monomers are 4-hydroxybutyl(meth)acrylate and/or 2-alkylpropane-1,3-diol- mono(meth)acrylate, and (a2) 10 to 80 % by weight, based on (a), are other hydroxyl-group containing olefinically unsaturated monomers. The coating materials further contain (B) 0.2 to 8 % by weight of photoinitiators.

L'invention concerne un procédé de production de revêtements. Selon ce procédé, (I) des substances de revêtement sont appliquées sur des substrats ou sur des couches de vernis non durcies, partiellement durcies et/ou entièrement durcies recouvrant lesdits substrats, et (II) les couches résultant des substances de revêtement sont durcies thermiquement et par rayonnement actinique, à part ou avec les couches de vernis. (1) Le durcissement par rayonnement actinique s'effectue dans une atmosphère appauvrie en oxygène et (2) les substances de revêtement contiennent (A) des copolymères de (méth)acrylate présentant un indice d'hydroxyle compris entre 100 et 220 mg KOH/g, une température de transition vitreuse comprise entre -35 et +60 ·C, un poids moléculaire moyen en nombre compris entre 1000 et 10000 dalton et un poids moléculaire moyen en masse compris entre 2000 et 40000 dalton. Lesdits copolymères de (méth)acrylate comportent par ailleurs une quantité, correspondant à l'indice d'hydroxyle, de monomères (a) comprenant des groupes hydroxyle, incorporés par polymérisation. (a1) 20 à 90 % en poids de (a) sont constitués de 4-hydroxybutyl(méth)acrylate et/ou de 2-alkyl-propan-1,3-diol-mono(méth)acrylate, et (a2) 10 à 80 % en poids de (a) sont d'autres monomères comprenant des groupes hydroxyle, oléfiniques et insaturés. Lesdites substances de revêtement comprennent en outre (B) 0,2 à 8 % en poids de photo-initiateurs.

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