ADHESIVE STRIP THAT CAN BE ACTIVATED BY HEAT AND IS BASED ON NITRILE RUBBER AND POLYVINYL BUTYRAL FOR STICKING TOGETHER ELECTRONIC COMPONENTS AND STRIP CONDUCTORS
Heat-activable adhesive tape for producing and further processing flexible conductor tracks, with an adhesive composed at least of a. an acrylonitrile-butadiene copolymer, with a weight fraction of 40% to 80% by weight, b. a polyvinyl acetal, with a weight fraction of 2% to 30% by weight, c. an epoxy resin, with a weight fraction of 10% to 50% by weight, and d. a hardener, the epoxide groups being chemically crosslinked with the hardener at high temperatures.
1 . Heat-activable adhesive tape for producing and further processing flexible conductor tracks, with an adhesive composed at least of
a. an acrylonitrile-butadiene copolymer, with a weight fraction of 40% to 80% by weight,
b. a polyvinyl acetal, with a weight fraction of 2% to 30% by weight,
c. an epoxy resin, with a weight fraction of 10% to 50% by weight, and
d. a hardener.
2 . The heat-activable adhesive tape of claim 1 , wherein the polyvinyl acetal is polyvinyl butyral.
3 . The heat-activable adhesive tape of claim 1 , wherein the acrylonitrile-butadiene copolymer is at least partly hydrogenated.
4 . The heat-activable adhesive tape of claim 1 , wherein the acrylonitrile content of the acrylonitrile-butadiene rubber is 15% to 50% by weight.
5 . The heat-activable adhesive tape of claim 1 , wherein the adhesive comprises more than one epoxy resin.
6 . The heat-activable adhesive tape of claim 1 , wherein the adhesive comprises one or more of tackifying resins, accelerators, dyes, carbon black and metal powders.
7 . The heat-activable adhesive tape of claim 1 , wherein the adhesive crosslinks at temperatures above 150° C.
8 . The heat-activable adhesive tape of claim 1 wherein the adhesive further comprises additional elastomers.
9 . A method for bonding flexible printed conductor tracks which comprises bonding said flexible printed conductor tracks with the heat-activable adhesive tape of claim 1 .
10 . A method for bonding an article to polyimide, which comprises bonding said article to said polyamide with the heat-activable adhesive tape of claim 1 .