China Petroleum & Chemical Corporation

Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation

Honghong Huang

Shijun Zhang

Meifang Guo

Luqiang Yu

Jinliang Qiao

Liangshi Wang

Jianjun Yin

Kai Xu

Tao Liu

Qiang Li

Peng Guo

Meng Xu

Zhichao Yang

Wenbo Song

Hua Yin

Jingbo Shao

Liying Zhang

Huijie Hu

Yiqing Bai

Mingfu Lyu

Hui Quan

Dali Gao

Liqiu Chu

Hongwei Shi

Yihui Xu

Xiaomeng Zhang

Hao Zou

Yaohui Xu

Mu Dong

Yun Lyu

Jianye Liu

Yujing Tang

Qingquan Yang

Wenjun Wei

Huan Xu

Liping Hou

Peiqian Yu

Jianfang Sheng

Ruxian Li

Disclosed herein are a polypropylene with narrow molecular weight distribution and a process for preparing the same in a reactor using a Ziegler-Natta catalyst.

Polypropylene with narrow molecular weight distribution range and processes for preparation thereof

A polyethylene composition comprising an ethylene/&#x3b1;-olefin copolymerized linear low density polyethylene, wherein the polyethylene composition has a Mw of from 100,000 g/mol to 200,000 g/mol, a Mw/Mn of from 4.0 to 9.0, a Mz/Mw of from 4.0 to 7.0, and a Mz+1/Mw of from 4.5 to 13.5, is provided. A film formed of the polyethylene composition is also provided.

Polyethylene compositions and films formed therefrom

The present invention provides a process for preparing high melt strength propylene polymer by direct polymerization, comprising that a propylene polymer with wide molecular weight distribution and containing 'very high molecular weight fraction' can be prepared by controlling the species and ratios of the external electron donors in the Ziegler-Natta catalyst system at different reaction stages according to the requirement for different molecular weight fractions in the different propylene polymerization stage of the series operation, and said polymer has excellent mechanical properties, especially with very high melt strength. The present invention also provides a propylene homopolymer with high melt strength, comprising the following features: (1) the MFR is 0.2-10 g/10 min at 230&#xb0; C. with a load of 2.16 kg; (2) the molecular weight distribution M/Mis 6-20; (3) the content of the fraction with a molecular weight higher than 5,000,000 is higher than or equal to 0.8 wt %; (4) M/Mis higher than or equal to 70. Said homopolymer can be used in the preparation of foam products, thermoforming products, biaxial stretching films, blown films and blow-molded products.

Propylene homopolymer having high melt strength and preparation method thereof

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Beijing, China

Honghong Huang