Polypropylene-based hot-melt adhesive

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 123/10 (2006.01) C09J 151/06 (2006.01)

Patent

CA 2160345

An adhesive composition comprising a melt blend of: (a) 50-95 % by weight of polypropylene that has been grafted with 0-5 %, especially at least 0.1 % by weight, of at least one ethylenically-unsaturated carboxylic acid or anhydride, or derivative thereof; and (b) 5-50 % by weight of at least one copolymer of ethylene and at least one comonomer selected from carbon monoxide, vinyl acetate, alkyl acrylates, alkyl methacrylates, in which the alkyl group has 1-4 carbon atoms, acrylic acid and methacrylic acid, and ethylene/propylene/diene copolymers, said copolymer having been grafted with 0-5 % by weight of at least one ethylenically-unsaturated carboxylic acid or anhydride, or derivative thereof. The adhesive composition has a melt viscosity suitable for use as a hot melt adhesive.

Composition adhésive comportant un mélange fondu: (a) de 50 à 95 % en poids de polypropylène ayant reçu une greffe de 0 à 5 % en poids, et notamment d'au moins 0,1 % en poids, d'au moins un anhydride ou un acide carboxylique éthyléniquement insaturé, ou de son dérivé; et (b) de 5 à 50 % en poids d'au moins un copolymère d'éthylène et d'au moins un comonomère sélectionné parmi le monoxyde de carbone, l'acétate de vinyle, les acrylates d'alkyle, les méthacrylates d'alkyle, où le groupe alkyle possède de 1 à 4 atomes de carbone, l'acide acrylique et l'acide méthacrylique, et de copolymères d'éthylène/propylène/diène, ledit copolymère ayant reçu une greffe de 0 à 5 % en poids d'au moins un anhydride ou un acide carboxylique éthyléniquement insaturé, ou de son dérivé. Cette composition adhésive présente une viscosité à chaud telle qu'elle est utilisable comme colle thermofusible.

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