Adhesive composition based on ethylene copolymers, useful...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 123/08 (2006.01)

Patent

CA 2592346

The invention concerns an adhesive composition consisting of at least one ethylene polymer or copolymer, said composition comprising at least one unsaturated carboxylic acid ester comonomer, and at least one functional comonomer, useful in an extrusion-coating process for application on a support or in an extrusion-lamination process for bonding together several supports of different type or not, in a wide temperature range. The invention is characterized in that said composition has an unsaturated carboxylic acid ester content, higher than 5 wt. % and in that the functional comonomer consists of at least one reactive function in the form of an acid group, anhydride or epoxy, whereof the proportion is less than 1 wt. % of the composition. Said composition has advantageous uses, in particular for bonding together substrates selected among aluminum, paper or cardboard, cellophane, films based of polyethylene, polypropylene, polyamide, polyester, polyvinyl chloride (PVC) polyvinylidene chloride (PVDC), polyacrylonitrile (PAN) resins, oriented or not, metal-coated or not, physically or chemically treated or not and films coated with a thin inorganic barrier layer, such as polyester (PET, SiOx or AlOx).

La présente invention se rapporte à une composition adhésive constituée d'au moins un polymère ou copolymère éthylènique, cette composition comprenant au moins un comonomère de type ester d'acides carboxyliques insaturés, et au moins un comonomère fonctionnel, utilisable dans un procédé d'extrusion- couchage pour application sur un support ou dans un procédé d'extrusion- lamination pour coller entre eux plusieurs supports de nature différente ou non, dans une large gamme de température, caractérisée en ce que ladite composition présente une teneur en comonomère(s) de type ester d'acides carboxyliques insaturés, supérieure à 5% en poids et que le comonomère fonctionnel est constitué d'au moins une fonction réactive sous forme d'un groupe acide, anhydride ou époxyde dont le taux est inférieur à 1 % en poids de la composition. Cette composition trouve des applications avantageuses, en particulier pour coller entre eux des substrats choisis parmi l'aluminium, le papier ou carton, la cellophane, les films à base de résines polyéthylène, polypropylène, polyamide, polyester, chlorure de polyvinyle(PVC), chlorure de polyvinylidène(PVDC), polyacrylonitryle (PAN), orientés ou non, métallisés ou non, traités ou non par voie physique ou chimique et les films revêtus d'une fine couche barrière inorganique, tels que le polyester (PET SiOx ou AIOx).

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