Thermoset adhesive films
View Patent ↗This invention is a film adhesive prepared from an adhesive composition comprising a polymer system, a film forming rubber compound, and curing agents for the polymeric system. The polymer system comprises a base polymer and electron donor and electron acceptor functionality.
1. A rubbery film adhesive prepared from materials consisting essentially of:
a rubbery polymer prepared from acrylic, vinyl, or conjugated diene monomers, substituted with both pendant electron donor and pendant electron acceptor functionality, and having a weight average molecular weight in the range of 300,000 to 1,500,000, and
a free radial initiator;
characterized in that the film adhesive can be cured within two minutes at a temperature below 300° C.
2. The film adhesive according to claim 1 in which the rubbery polymers are acrylics, styrene-acrytic copolymers, or acrylonitrile-butadiene copolymers, or combinations of those.
3. The film adhesive according to claim 1 further comprising a vinyl ether selected from the group consisting of bis[4-(vinyloxy)-butyl]terephthalate, bis[4-(vinyloxy)butyl](4-methyl-1,3-phenylene)-biscarbamate, bis[4-(vinyloxy) butyl]1,6-hexanediylbiscarbamate, 4-(vinyloxy)-butyl stearate, and bis[4-(vinyloxy) butyl)](methylenedi-4,1-phenylene)-biscarbamate.