Pressure sensitive adhesive

A pressure sensitive adhesive composition comprising a mixture of a solid rubber and a liquid rubber, the weight ratio of said solid rubber to said liquid rubber being from about 1:0.5 to about 1:7, said liquid rubber being selected from the group consisting of liquid isoprene, liquid isoprene-styrene, liquid butadiene-styrene, liquid carboxy terminated isoprene, liquid hydroxyl terminated isoprene, liquid hydrogenated isoprene, liquid isoprene butadiene, liquid polybutadiene, liquid depolymerized natural rubber, liquid carboxyl terminated isoprene-styrene, liquid hydroxyl terminated isoprene-styrene, liquid hydrogenated butadiene, liquid styrene-ethylene-butylene and liquid styrene-ethylene-propylene, said solid rubber comprises a block polymer having at least two polymer blocks A and at least one polymer block B, each block A is a thermoplastic styrene polymer block, the total block A content being from about 5 to about 50 percent by weight of the block polymer, B is an elastomeric polymer selected from the group consisting of isoprene, butadiene, ethylene-butylene, and ethylene-propylene and a reinforcing resin being compatible with block A and incompatible with block B of the block polymer, wherein said amount of said reinforcing resin content being from about 3% to about 20% be weight of the total weight of said solid and said liquid rubber.

A pressure sensitive adhesive composition comprising a mixture of a solid rubber and liquid rubber, the weight ratio of said solid rubber to said liquid rubber being from about 1:0.5 to about 1:7 wherein said liquid rubber having a number average molecular weight between about 10,000 to about 75,000 and being compatible with said solid rubber, said liquid rubber being selected from the group consisting of liquid isoprene, liquid isoprene-styrene, liquid butadiene-styrene, liquid hydroxyl terminated isoprene, liquid hydrogenated isoprene, liquid isoprene butadiene, liquid polybutadiene, liquid depolymerized natural rubber, liquid hydroxyl terminated isoprene-styrene, liquid hydrogenated butadiene, liquid styrene-ethylene-butylene ethylene-butylene and liquid styrene-ethylene-propylene, wherein said liquid rubber has a viscosity of between about 300 to about 15,000 poises at 38.degree. C.

A pressure sensitive adhesive composition comprising a mixture of a solid rubber and liquid rubber, the weight ratio of said solid rubber to said liquid rubber being from about 1:0.5 to about 1:7 wherein said liquid rubber is a thermoplastic liquid rubber having a number average molecular weight between about 10,000 to about 75,000 and being compatible with said solid rubber wherein said solid rubber is neoprene.