Pressure sensitive adhesive composition and pressure...

A - Human Necessities – 61 – K

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A61K 47/32 (2006.01) A61K 9/70 (2006.01) A61K 47/06 (2006.01) A61L 15/58 (2006.01) C09J 109/00 (2006.01) C09J 123/22 (2006.01) C09J 153/02 (2006.01)

Patent

CA 2753052

A pressure sensitive adhesive composition comprising, as a rubber component solid at ordinary temperature, from 10% by mass or more to less than 50% by mass of polyisoprene, from more than 50% by mass to 90% by mass or less of a styrene- isoprene- styrene block copolymer and 0 to 30% by mass of polyisobutylene, and further comprising, per 100 parts by mass of the solid rubber component, 1 to 30 parts by mass of polyisobutylene liquid at ordinary temperature, 50 to 120 parts by mass of a tackifier, and 1 to 40 parts by mass of a plasticizer liquid at ordinary temperature; and a pressure sensitive adhesive tape comprising a base material and the above-described pressure sensitive adhesive composition provided on the base material.

La présente invention concerne une composition adhésive qui contient, en tant que composant de caoutchouc qui est dans un état solide à température ambiante, 10 % en masse ou plus mais moins de 50 % en masse d'un polyisoprène, plus de 50 % en masse mais 90 % en masse ou moins d'un copolymère séquencé de styrène-isoprène-styrène, et 0 à 30 % en masse de polyisobutylène. La composition adhésive contient 1 à 30 parties en masse d'un polyisobutylène qui est dans un état liquide à température ambiante, 50 à 120 parties en masse d'un tackifiant et 1 à 40 parties en masse d'un plastifiant qui est dans un état liquide à température ambiante, pour 100 parties en masse du composant de caoutchouc qui est dans un état solide à température ambiante. L'invention a également pour objet un ruban adhésif où une couche de la composition adhésive est formée sur une base.

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