Adhesives with improved rivet properties and laminates using...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 133/06 (2006.01) B32B 7/12 (2006.01) C09J 133/02 (2006.01) C09J 133/14 (2006.01) C09J 135/00 (2006.01) C09J 139/06 (2006.01)

Patent

CA 2345267

Acrylate copolymer pressure-sensitive adhesive constructions are described which provide excellent retention of rivet properties. Tenting around rivets is minimized even after undergoing thermal aging while in contact with additive rich films like PVC. This is achieved by the inclusion of a synergistic amount of an N-vinyl lactam monomer and acid monomer with the bulk of the monomers being an alkyl acrylate save and/or methacrylate esters. A concomitant increase in cohesive strength is also achieved which affords good removal characteristics. The use of appropriate adhesive blends is further disclosed which allows retention of these features while also improving cold temperature properties.

L'invention concerne des structures réalisées grâce à des adhésifs autocollants à base de copolymère d'acrylate qui maintiennent remarquablement bien les propriétés des rivets. Le soulèvement en tente autour des rivets est réduit au minimum, même après un vieillissement thermique favorisé par le contact avec des films riches en additifs tels que le PVC. On obtient ces résultats grâce à l'inclusion d'une quantité synergique d'un monomère N-vinyle lactame et d'un monomère acide, le gros des monomères étant constitué d'un acrylate d'alkyle et/ou d'esters de méthacrylate. Parallèlement, on obtient une meilleure force de cohésion, ce qui offre de bonnes caractéristiques d'enlèvement. L'invention se rapporte aussi à l'utilisation de mélanges d'adhésifs appropriés qui permettent la conservation de ces paramètres tout en améliorant les propriétés à basse température.

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