Coating articles using radiation-curable powder coatings

B - Operations – Transporting – 05 – D

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B05D 7/24 (2006.01) B05D 3/06 (2006.01) C08J 3/28 (2006.01) C09D 5/03 (2006.01) C09D 133/04 (2006.01) C09D 133/06 (2006.01) C09D 133/24 (2006.01)

Patent

CA 2241798

The invention relates to a process for coating objects using polymer- containing powder coatings which are applied to the surface of the substrate, melted and cross-linked by exposure to UV radiation. The polymers used are copolymers containing the following: (a) at least one monomer of general formula (I) CH2=C(R1)-CO-OR2, in which R1 is H or CH3 and R2 is H, CnH2n+1, n being 1-30, an alicyclic, araliphatic or heterocyclic group or hydroxyalkyl, alkoxyalkyl, glycidyl or aminoalkyl group, or of general formula (II) CH2=C(R1)-CO-NR3R4, in which R1 is H or CH3, R3 and R4 can be identical or different and stand for H, CH2OH or CnH2n+1, n being 1-30, or CH2OR5, R5 being CmH2m+1 and m being 1-12; and (b) at least one copolymerisable ethylenically unsaturated organic compound of general formula (A), in which R' and R'' can be identical or different and stand for H, CpH2p+1, p being 1-6, cycloalkyl, aryl or aralkyl and R''' stands for an acryloyl, methacryloyl, ethacryloyl or cinnamoyl group, this compound being partially replaceable by one or more other copolymerisable ethylenically unsaturated organic compounds different from (a).

L'invention concerne un procédé de mise en peinture d'objets au moyen de peintures en poudre contenant des polymères, qui sont appliquées sur la surface du substrat à revêtir, fondues et réticulées par rayonnement UV. Les polymères utilisés sont des copolymères comprenant (a) au moins un monomère de formule générale (I) CH2=C(R<1>)-CO-OR<2>, dans laquelle R<1> représente H ou CH3 et R<2> représente H, CnH2n+1, n étant compris entre 1 et 30, un radical alicyclique, araliphatique ou hétérocyclique, un radical hydroxyalkyle, alcoxyalkyle, glycidyle ou aminoalkyle; ou de formule générale (II) CH2=C(R<1>)-CO-NR<3>R<4>, dans laquelle R<1> représente H ou CH3, R<3> et R<4> peuvent être identiques ou différents et représentent H, CH2OH, CnH2n+1, n étant compris entre 1 et 30, ou CH2OR<5>, R<5> représentant CmH2m+1, m étant compris entre 1 et 12; et b) au moins un composé organique copolymérisable, éthyléniquement insaturé, de formule générale (A), dans laquelle R' et R'' peuvent être identiques ou différents et représentent H, CpH2p+1, p étant compris entre 1 et 6, cycloalkyle, aryle ou aralkyle et R''' représente un radical acryloyle, méthacryloyle, éthacryloyle ou cinnamoyle, ce composé pouvant être remplacé partiellement par un ou plusieurs autres composés organiques copolymérisables, éthyléniquement insaturés, différents de (a).

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