Block copolymer composition, hot melt adhesive composition containing it, and process for the preparation thereof

  • US 5,461,095 A
  • Filed: 06/24/1994
  • Issued: 10/24/1995
  • Est. Priority Date: 08/25/1993
  • Status: Expired due to Term
First Claim
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1. 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 by coupling together two lithium terminated diblock copolymer chains, which have been prepared by anionic polymerization in an inert hydrocarbon solvent using a organomonolithium polymerization initiator, by means of a diglycidyloxy coupling agent consisting of at least one diglycidyloxy compound of general formula (I) ##STR6## wherein Ph represents a 1,4-phenylene group, R1 and R2 independently represent hydrogen, an alkoxy group or an alkyl group having 1 to 4 carbon atoms and n is an integer of 0, 1 or 2 with the proviso that the diglycidyloxy compound of n=0 constitutes at least 85% by weight of the total weight of the diglycidyloxy coupling agent,said linear block copolymer having a styrene content in the range of from 10 to 50% by weight based on the total weight of block copolymer and a peak molecular weight in the range of from 100,000 to 400,000;

    (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 of b1/b2 in the range of from 0.5 to 0.1.

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