| 摘要 |
Hot melt adhesive compositions, comprising (a) a radial multiarmed block copolymer (AB)nX, wherein A is a block predominantly derived from a monovinylaromatic compound, B is a block predominantly derived from butadiene and which optionally has been partially or completely hydrogenated, X is the residue of a multifunctional coupling agent, n is in the range of from 3 to 6, (b) a linear block copolymer AB, the components (a)+(b) being present in an amount of 100 parts by weight, (c) a tackifying resin, which is compatible with the blocks B, in an amount of from 100 to 500 parts by weight, (d) a plasticizer in an amount of from 100 to 300 parts by weight, (e) an antioxidant-UV stabiliser in an amount from 0.1 to 5 parts by weight, characterised in that the content of bound monovinylaromatic monomer in the block copolymers is at least 20%, the vinyl content in the polymerised butadiene is at least 25%, the diblock content, relative to the weight of components (a) and (b) is in the range of from 6 to 25%, the diblock has an apparent molecular weight in the range of from 70,000 to 100,000 and the radial multiarmed block copolymer has an apparent molecular weight in the range of from 200,000 to 500,000, and disposable articles and pressure sensitive labels derived from them.
|
