Adhesive blends comprising hydrophilic and hydrophobic...

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 133/00 (2006.01) B32B 7/12 (2006.01) C09J 7/02 (2006.01) C09J 153/00 (2006.01) C09J 153/02 (2006.01)

Patent

CA 2415386

An adhesive blend is comprised of a hydrophilic pressure sensitive adhesive comprising the polymerization product of (a) about 15 to about 85 parts by weight of an (meth)acrylate ester monomer wherein the (meth)acrylate ester monomer, when polymerized, has a glass transition temperature (Tg) of less than about 10.ordm.C; (b) about 85 to about 15 parts by weight of a hydroplhilic acidic comonomer; and (c) at least about 10 parts based on 100 parts of the sum of components (a) + (b) of a non-reactive plasticizing agent and a hydrophobic pressure sensitive adhesive comprising an elastomer or thermplastic elastomer including styrene block copolymers (e.g., linear, radial, tapered, star) consisting of copolymerized styrene and isoprene, butadiene or ethylene-butlene; polyisoprene; polybutadiene; polyisobutylene; butyl rubber; styrene-butadiene rubber; natural rubber; and poly-.alpha.- olefins (e.g., polyhexene, polyoctene and propylene-hexene).

L'invention concerne un mélange d'adhésifs constitué d'un adhésif autocollant hydrophile comprenant un produit de polymérisation a) d'environ 15 à 85 parts en poids d'un monomère d'ester (méth)acrylique qui, lorsqu'il est polymérisé, présente une température (T¿g?) de transition vitreuse inférieure à environ 10.ordm. C, b) d'environ 85 à 15 parts en poids d'un comonomère acide hydrophile, et c) au moins environ 10 parts sur la base de 100 parts de la somme des composants (a) + (b) d'un agent de plastifiant non réactif; et un adhésif autocollant hydrophobe comprenant un élastomère ou un élastomère thermoplastique constitué de copolymères séquencés styrène (par exemple, linéaires, radiaux, coniques, en étoile) qui comprennent du styrène copolymérisé et de l'isoprène, du butadiène ou de l'éthylène-butylène, du polyisoprène, du polybutadiène, du polyisobutylène, du caoutchouc butyle, du caoutchouc styrène-butadiène, du caoutchouc naturel, et des polyoléfines .alpha. (par exemple, du polyhexène, du polyoctène et du propylène-hexène).

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