Acrylic copolymer, acrylic pressure-sensitive adhesive...

C - Chemistry – Metallurgy – 08 – F

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C08F 290/04 (2006.01) C08F 293/00 (2006.01) C08G 81/00 (2006.01) C09J 7/02 (2006.01) C09J 133/04 (2006.01) C09J 153/00 (2006.01) C09J 155/00 (2006.01)

Patent

CA 2369599

An acrylic copolymer having polymer segments differing in polarity and glass transition point. The combination of these polymer segments differing in polarity and glass transition point can be easily regulated, and the copolymer has a high degree of freedom of design. It is usable in a wide range of applications. The acrylic copolymer is obtained by copolymerizing (a) an alkyl (meth)acrylate having a C1-14 alkyl group, (b) an olefin (co)polymer terminated by a radical-polymerizable unsaturated double bond, and (c) a polymer terminated by a radical-polymerizable unsaturated double bond and having a number-average molecular weight of 2,000 to 30,000 and a glass transition temperature of 30~C or higher, and comprises a backbone polymer consisting mainly of units of the alkyl (meth)acrylate (a) and, grafted to the backbone, polymeric branches which have low polarity and differ in glass transition point.

Ce copolymère acrylique possède des segments polymères dont la polarité et le point de transition vitreuse diffèrent, la combinaison de tels segments polymères pouvant être facilement régulée. Ce copolymère possède un degré élevé de liberté de conception et on peut l'utiliser dans un large éventail d'applications. On obtient ce copolymère acrylique en copolymérisant (a) un (méth)acrylate d'alkyle possédant un groupe alkyle C¿1-14?, (b) un (co)polymère oléfinique terminé par une double liaison insaturée, à polymérisation radicalaire, et (c) un polymère terminé par une double liaison insaturée à polymérisation radicalaire, comprenant un poids moléculaire moyen en nombre compris entre 2000 et 30000 et une température de transition vitreuse de l'ordre de 30 ·C ou plus. Ce copolymère acrylique comprend également un polymère à squelette linéaire, composé principalement d'unités du (méth)acrylate d'alkyle, sur le squelette duquel on a greffé des ramifications polymériques possédant une faible polarité et différant quant à leur point de transition vitreuse.

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