Polyolefin moldings and films having permanently improved...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/02 (2006.01) C08J 7/00 (2006.01)

Patent

CA 2233857

Polyolefine-based mouldings and foils contain internal bonding additives which are enriched by migration at the plastic surface and which have their molecular structure bonding substituents of higher polarity on an oleophilic hydrocarbon radical. At least one part of these internal additives is hardened via its hydrocarbon radicals in the area of the plastic surface and prevented from further migrating, and so permanent adhesive bondings and/or coatings of the polyolefine surface may be obtained without additional preliminary treatments. Also disclosed is a process for furnishing solid polyolefine surfaces with such adherence-improving, immobilised additive (mixtures), and other auxiliary agents used for that purpose.

L'invention concerne des pièces moulées et des films à base de polyoléfine, renfermant des additifs internes promoteurs d'adhérence qui sont enrichis par migration à la surface de la matière plastique et qui présentent dans leur structure moléculaire des substituants promoteurs d'adhérence de polarité élevée au niveau d'un groupe hydrocarbure oléophile. Au moins une partie de ces additifs internes est durcie dans la zone superficielle de la matière plastique par l'intermédiaire de ses restes hydrocarbure et inhibée vis-à-vis de toute autre migration, de sorte que l'on puisse réaliser des collages et/ou des revêtements, d'adhérence permanente, sur la surface de polyoléfine et ce, même sans prétraitements supplémentaires. L'invention décrit également le procédé utilisé pour obtenir des surfaces de polyoléfine solides avec des (mélanges d') additifs améliorant l'adhérence sous forme immobilisée et les autres adjuvants utilisés à cet effet.

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