Reactive mixture for coating moulded objects by means of...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 4/00 (2006.01) B29C 45/16 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2690735

The present invention relates to a reactive mixture for coating mouldings by means of reaction injection moulding, comprising at least 40% by weight of (meth) acrylates having at least two double bonds, the reactive mixture comprising at least one photoinitiator and at least one thermal initiator. The present invention furthermore describes a coated moulding comprising a moulding which is obtainable by injection moulding processes and comprises at least one polymer selected from the group consisting of polymethyl methacrylate, polymethylmethacrylimide, styrene-acrylonitrile copolymer, styrene-maleic acid copolymer and polymethyl methacrylate copolymers, and a coating which is obtainable by polymerization of (meth) acrylates having at least two double bonds, the coating having an adhesive strength rating of not more than 1 according to the cross hatch test and a decrease in gloss at 20° after a scratch resistance test according to ASTM 1044 (12/05) (applied weight 500 g, number of cycles = 100) of not more than 10%.

La présente invention concerne un mélange réactif pour le revêtement de corps moulés par moulage par injection-réaction comprenant au moins 40 % en poids de 5 (méth)acrylates comportant au moins deux doubles liaisons, le mélange réactif comprenant au moins un photo-initiateur et au moins un initiateur thermique. En outre, la présente invention décrit un corps moulé revêtu comprenant un corps moulé pouvant être obtenu par un procédé de moulage par injection, ce corps comprenant au moins un polymère choisi dans le groupe constitué de polyméthylméthacrylate, de polyméthacrylméthylimide, de copolymère styrène-acrylonitrile, de copolymère de styrène-acide maléique et de copolymère de polyméthylméthacrylate, et un revêtement qui peut être obtenu par polymérisation de (méth)acrylates comportant au moins deux doubles liaisons, le revêtement présentant une adhésivité évaluée au maximum à 1 selon le test de section de grille et une diminution du lustre à 20° selon un test de résistance aux rayures selon la norme ASTM 1044 (12/05), (charge de 500 g, nombre de cycles = 100) au maximum de 10 %.

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