| 摘要 |
PROBLEM TO BE SOLVED: To provide a pull-open cap or an integrated cap of pull-open cap and a hinge cap which has the pull-open property, is not deformed even when heated for 30-45 minutes at 100-130 deg.C, is not degraded in the weld strength of a pull-ring part, and is 60 deg.C or over in heat distortion temperature. SOLUTION: A pull-open cap or an integrated cap of the pull-open cap with a hinge cap is obtained by injection-molding the resin composition where 35-60 pts.wt. hydrogenated styrene-butadiene rubber of 3-6 g/10 min. in melt flow rate (230 deg.C, 21.18 N) is blended to 100 pts.wt. of propylene-ethylene block copolymer resin with not less than 20 wt.% in xylene extraction at 25 deg.C of 3-100 g/10 min. in melt flow rate (230 deg.C, 21.18 N). |
