| 摘要 |
A stretch material characterized by(i)comprising 100 parts by mass of a hydrogenated block copolymer which bears two or more vinyl aromatic polymer blocks(A)and one or more conjugated diene polymer blocks(B)with the content of the component(A)ranging from 10 to 40 % by mass and the degree of hydrogenation of the component(B)being 50 % or above and has a number−average molecular weight of 50,000 to 140,000,0 to 120 parts by mass of a nonaromatic rubber softener,0 to 80 parts by mass of polyethylene exhibiting an MFR of 15g/10 min or above at 190°C under a load of 2.16 kg,and 0 to 40 parts by mass of polystyrene exhibiting an MFR of 5 g/10 min or above at 200°C under a load of 5.00 kg,(ii)exhibiting a residual strain of 15 % or below after 150 % tension test at 25°C,(iii)exhibiting a tensile permanent set of 10 % or below 30 minutes after 100 % extension at 25°C for 120 minutes,(iv)exhibiting a deviation of melt tension of 15 % or below in melt tension test conducted under such temperature conditions as to exhibit an MFR of 5 to 15 g/10 min,and(v)exhibiting a take−up speed at melt fracture of 60 m/min or above in melt tension test conducted under such temperature conditions as to exhibit an MFR of 5 to 15 g/10 min. |
