Adhesive compositions based on blends of grafted...

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 123/08 (2006.01) B32B 27/12 (2006.01) B32B 27/32 (2006.01) C08L 23/00 (2006.01) C08L 23/04 (2006.01) C08L 25/02 (2006.01) C09J 7/02 (2006.01) C09J 123/04 (2006.01) C09J 123/26 (2006.01) C09J 151/06 (2006.01) C09J 153/00 (2006.01)

Patent

CA 2330101

The invention relates to adhesive compositions having a modified polyethylene; an unmodified polyethylene of a certain density and a styrene-based elastomer. The styrene-based elastomer is present in a weight percentage of 10 to 45 wt. percent relative to the total weight of the elastomer plus the modified and unmodified polyethylenes. The adhesive composition is particularly useful in multilayer composite structures having polypropylene as one substrate and having bonded thereto a polyethylene or a layer which is made from an ethylene copolmer such as an ethylene/acid copolymer or an ethylene acid ionomer. In addition, the adhesive composition is particularly useful in multilayer structures having five layers wherein a single adhesive composition is needed as layer two and four and the other structural layers are, for example, polyethylene/nylon/polypropylene or similar structures which would heretofore require two different polyolefin base adhesives.

L'invention concerne des compositions adhésives comportant un polyéthylène modifié; un polyéthylène non modifié d'une certaine densité et un élastomère à base de styrène. L'élastomère à base de styrène est présent à raison de 10 à 45 % en poids par rapport au poids total de l'élastomère, additionné des polyéthylènes modifié et non modifié. La composition adhésive est particulièrement utile dans les structures composites multicouche comportant un polypropylène comme substrat et un polyéthylène lié à ce substrat ou une couche constituée d'un copolymère d'éthylène tel qu'un copolymère éthylène/acide ou un ionomère éthylène acide. En outre, la composition adhésive est particulièrement utile dans les structures multicouche à cinq couches, dans lesquelles une seul composition adhésive est nécessaire pour les couches deux et quatre, les autres couches structurelles étant, par exemple, du polyéthylène/nylon/polypropylène ou des structures similaires qui nécessitaient, jusqu'à présent, deux adhésifs à base de polyoléfines différents.

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