| 摘要 |
The present invention relates to a hot melt adhesive composition, which is especially suited for use in disposables, and is comprised of: a) 100 parts by weight of a blend of: i) a linear block copolymer of the formula: A-B-A-D and/or A-B-A, wherein A is a vinyl aromatic hydrocarbon polymer block having a weight average molecular weight of from 4000 to 35.000, B is a hydrogenated polydiene polymer block having a weight average molecular weight of from 20.000 to 200.000, D, if present, is a hydrogenated or unhydrogenated polydiene polymer block having a weight average molecular weight of from 3000 to 50.000, wherein the ratio of the molecular weight of D to the molecular weight of B is no more than 0.5 and the copolymer has a vinyl aromatic hydrocarbon content of from 9 to 35 percent by weight; and ii) an unhydrogenated vinyl aromatic hydrocarbon-diene diblock copolymer having a weight average molecular weight of 10.000 to 50.000 and a poly(vinyl aromatic hydrocarbon) content of from 10 to 40 % by weight, wherein the diblock copolymer comprises from 10 to 35 % by weight of the blend, and b) 100 to 275 parts by weight of a tackifying resin which is compatible with the diene blocks, and c) 0 to 80 parts of a plasticizer. The present invention further relates to a specific linear block copolymer of formula A-B-A-D.
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