Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-09-30
1999-04-06
Mullis, Jeffrey C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 98, 525 99, C08L 5302
Patent
active
058919570
ABSTRACT:
A pressure sensitive adhesive composition for skin adhesion and bandage applications which comprises (a) 100 parts by weight of a styrene-isoprene-styrene triblock or multiarm copolymer which has a coupling efficiency of 20 to 50%, an overall absolute arm molecular weight of 33,000 to 100,000, a polystyrene content of 18 to 30%, and a polystyrene block weight average molecular weight of 11,000 to 20,000, and (b) from 100 to 400 parts by weight of a styrene-isoprene diblock copolymer which has an overall absolute molecular weight of 20,000 to 40,000, a polystyrene content of 10 to 25%, and a polystyrene block weight average molecular weight of 4000 to 7000.
REFERENCES:
patent: 4080348 (1978-03-01), Korpman
patent: 4136071 (1979-01-01), Korpman
patent: 5039750 (1991-08-01), Miller et al.
patent: 5274036 (1993-12-01), Korpman et al.
patent: 5462538 (1995-10-01), Korpman
European Search Report of 3 Feb. 1998.
Hansen David Romme
Korpman Ralf
Haas Donald F.
Mullis Jeffrey C.
Shell Oil Company
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