Acrylic structural adhesive having improved t-peel strength

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 4/06 (2006.01) C08F 279/00 (2006.01) C08F 283/00 (2006.01) C08F 287/00 (2006.01) C08F 290/04 (2006.01) C09J 151/00 (2006.01)

Patent

CA 2481589

Epoxy-modified, two-part acrylic structural adhesives characterized by improved T-peel strength are disclosed. These adhesives are not inhibited by oxygen. Representative embodiments include 2-part acrylic structural adhesives comprising,in a first package from about 10 to about 90 percent by weight of at least one methacrylate selected from C3-C10 alkyl monosubstituted-, C1-C6 alkyl disubstituted-, C1-C4 alkyl trisubstituted, and Cl-C4 alkyl tetra- substituted cyclohexyl methacrylate. The ring substituents are prefereably in the 3, 4, and/or 5 ring position, and linear or branched C4-C10 branched alkyl methacrylates; from about 10 to about 80 percent by weight of a toughener, and an adhesion promotor; and in a second package, a bonding activator, and optional epoxy resin.

L'invention concerne des adhésifs structurels acryliques en deux parties modifiés par un époxy qui se caractérisent par une force de détachement T. Ces adhésifs ne sont pas inhibés par oxygène. Dans des modes de réalisation représentatifs, des adhésifs structurels acryliques en deux parties comportent, dans un premier paquet entre environ 10 % et environ 90 % en poids d'au moins un méthacrylate sélectionné parmi méthacrylate cyclohéxyle alkyle C¿3-?C¿10? monosubstitué-, alkyle C¿1?-C¿6? disubstitué-, alkyle C¿1?-C¿4? trisubstitué, et alkyle C¿l?-C¿4? tetrasubstitué. Les substituants de cycle sont de préférence en position de cycle 3, 4, et/ou 5, et des méthacrylates alkyle ramifié C¿4?-C¿10 ?linéaires ou ramifiés. Ces adhésifs comportent également entre environ 10 % et environ 80 % en poids d'un promoteur de résistance et d'adhésion dans le premier paquet, et un activateur de liaison et éventuellement une résine époxy dans un second paquet.

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