A resin composition for injection molding comprising (I) 70-90 wt. parts of a propylene polymer resin having a MFR of at least 30 g/10 min. but smaller than 200 g/10 min. as measured at 230°C according to ASTM D-1238, (II) 5-25 wt. parts of an ethylene-α-olefin copolymer having a melt strength (MS160) of larger than 50 mN but not larger than 300 mN as measured at 160°C, and (III) 5-25 wt. parts of an olefin polymer resin having a density of at least 850 kg/m3 but not larger than 930 kg/m3 as measured according to JIS K6760, and a melt strength (MS160) of smaller than 30 mN as measured at 160°C, wherein the sum of (I), (II) and (III) is 100 wt. parts. This resin composition gives an injection molded article exhibiting enhanced impact strength at a low temperature and having no or minimized flow marks on the surface thereof.
一种用于注塑成型的
树脂组合物,包括:(I) 70-90 重量份的
丙烯聚合物
树脂,根据 ASTM D-1238 标准,在 230°C 时测得的 MFR 至少为 30 克/10 分钟,但小于 200 克/10 分钟;(II) 5-25 重量份的
乙烯-α-烯烃共聚物,在 160°C 时测得的熔体强度(MS160)大于 50 毫牛顿,但不大于 300 毫牛顿;以及 (III) 5-25 重量份的烯烃聚合物
树脂,根据 JIS K6760 标准,其密度至少为 850 千克/立方米,但不大于 930 千克/立方米,且熔体强度(MS160)大于 50 毫牛顿,但不大于 300 毫牛顿。(III) 5-25 重量份的烯烃聚合物
树脂,根据 JIS K6760 测量,其密度至少为 850 kg/m3,但不大于 930 kg/m3,160°C 时的熔体强度 (MS160) 小于 30 mN,其中 (I)、(II) 和 (III) 的总和为 100 重量份。这种
树脂组合物可以生产出在低温下冲击强度更高的注塑成型品,其表面没有流痕或流痕最小。