{HEAD ~ A rubbery copolymer} of butadiene, styrene and {TAIL ~ acrylonitrile}, if desired, with a tensile strength of about 50 to about 100 psig containing a minor amount of styrene, particularly in combination with selective tackifier resins 
{ HEAD ~ A rubbery copolymer } of butadiene , styrene and { TAIL ~ acrylonitrile } , if desired , with a tensile strength of about 50 to about 100 psig containing a minor amount of styrene , particularly in combination with selective tackifier resins
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