| 摘要 |
<p>A structurally toughened heat resistant adhesive composition comprising a solution of butadiene-styrene block copolymers in polymerizable acrylate ester monomers. The adhesive composition also contains an adhesion promoter, a cross-linking agent, a free-radical generator and a free-radical accelerator. The adhesive compositions are generally used as two-part systems, and yield bonds with improved heat and solvent resistant properties. The polymerizable acrylate ester monomers may be monofunctional or a combination of mono- and polyfunctional monomers. Among the useful classes of monomers are alkyl and cycloalkyl acrylates, alkyl and cycloalkyl methacrylates, alkoxy acrylates and methacrylates, alkylene diacrylates and dimethacrylates. A few of the preferred monomers are methyl methacrylate, lauryl methacrylate, isobornyl methacrylate, and tetrahydrofurfuryl methacrylate. It is preferred that the butadiene-styrene rubbers be block copolymers with the structures of (A)n(B)m, (ABA)n or (A-B)n, wherein A represents a polystyrene chain and B represents a polybutadiene chain; n and m are integers greater than or equal to one (1) and define the number of repeating units. Additionally, these structures generally contain a functional group at one or both ends of the plymer chain. Suitable functional groups are vinyl, epoxy, carboxy, and mercapto groups.</p> |
