Hydrogenated diene block copolymer and composition comprising the same

  • US 5,306,779 A
  • Filed: 09/01/1992
  • Issued: 04/26/1994
  • Est. Priority Date: 05/19/1989
  • Status: Expired due to Term
First Claim
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1. A hydrogenated diene block copolymer having a polystyrene-reduced number-average molecular weight of 50,000-600,000 which is a hydrogenation product of an (A)-(B) block copolymer in which (A) means an alkenyl aromatic compound polymer block and (B) means an alkenyl aromatic compound-conjugated diene random copolymer block wherein the vinyl content of the conjugated diene portion is 15-60%, an (A)-(B)-(C) block copolymer in which (A) and (B) are as defined above and (C) means an alkenyl aromatic compound-conjugated diene copolymer tapered block wherein the proportion of the alkenyl aromatic compound increases gradually, or an (A)-(B)-(A) block copolymer in which (A) and (B) are as defined above, in which block copolymer(1) the weight proportion of the alkenyl aromatic compound/the conjugated diene is 5/95 to 60/40, and(2) the content of the bound alkenyl aromatic compound in at least one block (A) is at least 3% by weight and the total of the bound alkenyl aromatic compound contents in the two block (A)'"'"'s or the block (A) and the block (C) is 3-50% by weight based on the total monomers, and in which hydrogenation product at least 80% of the double bond unsaturations of the conjugated diene portion is saturated by the hydrogenation.

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