Lift-off tape and process

Claim 1

The process of applying an adhesive film to an application surface which comprises: a. selecting a normally nontacky and normally nonelastomeric adhesive film consisting essentially of thermoplastic and elastomeric A-B block copolymers wherein the A-blocks are thermoplastic and possess a number average molecular weight of at least about 6,000 and the B-blocks are elastomeric and possess a number average molecular weight in the range of about 45,000-180,000, and 20-120 parts per one hundred parts by weight of the block copolymers of normally solid resins adapted to associate principally with the thermoplastic A-blocks of said copolymers; said A-blocks constituting about 5-50 percent by weight of the block copolymer and being derived from styrene or styrene homologues said B-blocks being derived from conjugated dienes or lower alkenes, said film exhibiting a plastic state at low elongations and an elastomeric state at high elongations and being convertible from a normally nontacky and nonelastomeric plastic state to a tacky elastomeric state by subjecting said film to substantial stress to cause it to pass through its plastic state and become tacky and elastomeric; b. subjecting a portion of said film to substantial stress to cause it to pass through its plastic state and become tacky and elastomeric; and c. pressing the resulting tacky and elastomeric portion of said film into adhering contact with said surface.