The present invention provides a resin suitable for use in rotational molding having an environmental stress crack resistance of greater than 1000 hours. The resin has a density from 0.937 to 0.942 g/cm3, a melt index I2 determined according to ASTM D 1238 (2.16 kg 190°C - I2) from 4.0 to 7.0 g/10min, an I21 determined according to ASTM D 1238 (21.6 kg 190°C - I21) from 160 to 200 g/10 min, an I21/I2 from 30 to 40 and a terminal vinyl unsaturation greater than 0.06, per 1000 carbon atoms; and a primary structure parameter (PSP2) of from 4 to 7, and an overall Mw/Mn from 2.7 to 3.5 comprising from 2 to 5 weight % of one or more C4-8 alpha olefin comonomers.
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机译：本发明提供了一种适用于滚塑的树脂，其耐环境应力开裂性大于1000小时。树脂的密度为0.937至0.942 g / cm 3 ，熔融指数I 2 根据ASTM D 1238（2.16 kg 190°C-I 2 ）从4.0到7.0 g / 10min，I 21 从ASTM D 1238（21.6 kg 190°C-I 21 ）从160降低到每1000个碳原子200 g / 10分钟，I 21 / I 2 为30至40，末端乙烯基不饱和度大于0.06;初级结构参数（PSP2）为4至7，总Mw / Mn为2.7至3.5，其中包含2至5重量％的一种或多种C 4 - 8 < / sub>α-烯烃共聚单体。
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