| 摘要 |
A method of hydrogenating a block copolymer, which comprises passing a solution of an aromatic vinyl/conjugated diene block copolymer together with hydrogen gas through a fixed-bed reactor packed with a hydrogenation catalyst comprising a platinum group metal deposited on an inorganic support to convert the unsaturated bonds in the aromatic ring blocks and conjugated diene blocks of the block copolymer into saturated bonds through hydrogenation, wherein (1) the block copolymer has a number-average molecular weight of 40,000 to 450,000, (2) the conjugated diene blocks in the block copolymer have a number-average molecular weight of 30,000 or higher, (3) the concentration of the block copolymer in its solution is 5 to 30 wt.%, and (4) the fixed catalyst bed has a temperature of 150 to 250 DEG C. |
