Patent ID: 7579385

Claim:
Dried porous crumbs of a hydrogenated block copolymer which is obtained by hydrogenating a block copolymer comprising (a) at least one polymer block composed mainly of aromatic vinyl monomer units and (b) at least one polymer block composed mainly of conjugated diene monomer units, said hydrogenated block copolymer having a molecular weight of 70,000 or more, said dried porous crumbs having a water content of 1% by weight or less and having an oil-absorbing capability of 1.0 or more, as determined by a method comprising immersing 10 g of the dried porous crumbs in 1 liter or more of a paraffin process oil at 25° C. under atmospheric pressure for 1 minute, taking out the resultant oil-containing porous crumbs from the oil, introducing the crumbs into a centrifugal separator and treating the oil-containing porous crumbs under 1,000 G for 3 minutes to thereby separate the oil adhering to the crumbs from the crumbs, taking out the crumbs from the centrifugal separator, measuring the weight of the crumbs and calculating the oil-absorbing capability of the dried porous crumbs by the following formula: Oil-absorbing capability={(the weight of the oil-containing porous crumbs after the centrifugation)−(the weight of the dried porous crumbs before the immersion in the oil)}/(the weight of the dried porous crumbs before the immersion in the oil), and said dried porous crumbs having an average pore diameter of from 9.7 to 20 μm.