| 摘要 |
A block copolymer composition comprising: (a) 100 parts by weight of a linear block copolymer comprising two polystyrene endblocks and one poly(conjugated diene) midblock, which block copolymer is obtained via a coupling reaction using a diglycidyloxy coupling agent and which block copolymer has a styrene content in the range of from 10 to 50% by weight based on the total weight of block copolymer and an apparent molecular weight in the range of from 100,000 to 400,000; and (b) 0.1 to 2 parts by weight of a stabilizer package consisting of: (b1) 6-(4-hydroxy-3,5-di-t-butylanilino)-2,4-bis-octylthio-1,3,5-triazine, and (b2) a tris-(nonylated phenyl) phosphite, in a weight ratio b1/b2 in the range of from 0.5 to 0.1. The block copolymer composition can be suitably applied in hot melt adhesive compositions. A process for preparing the block copolymer composition comprising the subsequent steps of preparing lithium terminated styrene-conjugated diene diblock copolymer chains, coupling these polymer chains by adding the diglycidyloxy coupling agent, adding the stabilizer package and recovering the block copolymer composition.
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