Co-extrudable adhesives with good age-down resistance

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 123/04 (2006.01) B32B 7/12 (2006.01) C09J 123/08 (2006.01) C09J 123/16 (2006.01) C09J 151/06 (2006.01)

Patent

CA 2213863

Co-extrudable adhesive compositions which have excellent adhesion, and which bond well to ionomers, even after long aging, are formed by blending polyethylene with a very low density of 0.86 to 0.91 with polyethylene having a density of 0.91 to 0.935, together with a hydrocarbon elastomer. Acid grafting of any of the component is preferably present. More than an insubstantial amount of polyethylene with higher density than 0.935 is deleterious to initial or age-down peel strength of the adhesive ionomer bond, and is not part of the adhesive composition.

Ces compositions adhésives co-extrudables, qui possèdent une excellente adhérence et qui se lient bien au ionomères, même après un vieillissement important, sont fabriqués par mélange du polyéthylène de très basse densité, de 0,86 à 0,91, avec du polyéthylène ayant une densité comprise entre 0,91 et 0,935, et avec un élastomère de carbure d'hydrogène. Le greffage acide de n'importe lequel des composants est de préférence prévu. La présence de polyéthylène de densité supérieure à 0,935 en quantité non négligeable est défavorable à la résistance au décollage initial ou dû au vieillissement de la liaison adhésive de l'ionomère et ne fait pas partie de la composition adhésive.

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