n the first set of brackets makes up about 70 to 20 percent by weight of the copolymer, and b is a number such that the "soft segment within the second set of brackets makes up about 30 to 80 percent by weight of the copolymer, said adhesive having the epoxy resin present in an amount of about 5 to about 50 weight percent and the copolymer present in an amount of about 50 to 95 weight percent of