| 摘要 |
<p>Pressure sensitive adhesive composition comprises at least 70 wt.%, preferably 80 wt.% mixture of block copolymers made of a mixture of block copolymer (I), (II), (III), (IV) or (V) and at least an adhesive resin. The amount of the block copolymers (I) is 30-70 wt.%, based on the total amount of block copolymers. The amount of the block copolymers (II)-(V) is 30-70 wt.%, based on the total amount of block copolymers. The molecular weight of the total block copolymer is greater than 130 g/mole. Pressure sensitive adhesive composition comprises at least 70 wt.%, preferably 80 wt.% mixture of block copolymers made of a mixture of block copolymer of formula (A1-B1) (I), (A2-B2-A2) (II), ((A2-B2) n) (III), ((A2-B2) nX) (IV) or ((A2-B2-A2) n) (V) and at least an adhesive resin. The amount of the block copolymers (I) is 30-70 wt.%, based on the total amount of block copolymers. The amount of the block copolymers (II)-(V) is 30-70 wt.%, based on the total amount of block copolymers. The molecular weight of the total block copolymer is greater than 130 g/mole. X : group of coupling reagent; n : 2-10; A2 A1 : polymer block of vinyl aromatic compound, where (a) amount of A2 in (II), (III), (IV) or (V) is 25-40 wt.%, (b) amount of A1 in (I) is 20-40 wt.%, preferably 25-33 wt.% or 13-20 wt.%, and (c) A2-B2 unit exhibits molecular weight of greater than 65000 g/mole; and B2, B1 : polymer block formed from butadiene, mixture of butadiene and isoprene or mixture of butadiene and styrene.</p> |
