| 摘要 |
The invention provides pressure-sensitive adhesive compositions comprising (a) a linear or multiarm styrene-isoprene-styrene block copolymer containing at least two styrene-isoprene arms having overall absolute arm weight average molecular weight in the range from 33,000 to 100,000, polystyrene content in the range from 18 to 30%w, and polystyrene block weight average molecular weight in the range from 11,000 to 20,000, (b) a styrene-isoprene diblock copolymer having weight average molecular weight in the range from 33,000 to 100,000, polystyrene content in the range from 18 to 30%w, and polystyrene block weight average molecular weight in the range from 11,000 to 20,000, and (c) a styrene-isoprene diblock copolymer having weight average molecular weight in the range from 20,000 to 40,000, polystyrene content in the range from 10 to 25%w and polystyrene block weight average molecular weight in the range from 4000 to 7000, wherein the weight ratio (a):(b) is in the range from 1:4 to 1:1 and the weight ratio (a+b):(c) is in the range from 1:1 to 1:4; a process for preparing such a composition; pressure-sensitive adhesive laminae, e.g. tapes, patches or bandages; and a process for preparing such laminae.
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