一种生产多峰乙烯聚合物的方法以及由其制备的薄膜

Multimodal ethylene copolymers were prepared by a three-step polymerization method and a Ziegler-Natta catalyst, which solved the problems of insufficient hardness and poor processability of multimodal ethylene polymers in recycling. This resulted in a multimodal ethylene polymer with a balance of high hardness and toughness, suitable for film manufacturing.

CN117480191BActive Publication Date: 2026-07-17BOREALIS AG

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BOREALIS AG
Filing Date
2022-06-10
Publication Date
2026-07-17

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Abstract

生产多峰乙烯聚合物的方法包括以下步骤:(i)在齐格勒‑纳塔聚合催化剂存在下,在第一聚合步骤中聚合乙烯,以制备熔体流动速率MFR2为100至300g / 10min(ISO 1133‑1,在190℃,2.16kg负载下)的第一乙烯均聚物(PE1);(ii)在第一乙烯均聚物的存在下,在第二聚合步骤中聚合乙烯,以制备包含第一乙烯均聚物和第二乙烯均聚物的第一乙烯聚合物混合物(PEM1),第一乙烯聚合物混合物的熔体流动速率MFR2为200至1000g / 10min,并且其中第一乙烯均聚物(PE1)的MFR2低于第一乙烯聚合物混合物(PEM1)的MFR2;和(iii)在第一乙烯聚合物混合物的存在下,在第三聚合步骤中使乙烯和至少一种α‑烯烃共聚单体共聚,以制备包含第一乙烯聚合物混合物和第三乙烯共聚物(PE3)的第二乙烯聚合物混合物(PEM2),第二乙烯聚合物混合物的密度为937至950kg / m3(ISO 1183‑2),熔体流动速率MFR5为0.1至5.0g / 10min(ISO 1133‑1,在190℃,5kg负载下)。
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