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Polyethylene copolymers containing vinyl-terminated macromonomers as comonomers

An ethylene copolymer and vinyl-terminated technology, applied in the field of olefin polymerization, can solve the problem of low catalyst productivity

Inactive Publication Date: 2017-10-17
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst productivity is very low (0.95-1.14 g / mmol Ti / hr)

Method used

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  • Polyethylene copolymers containing vinyl-terminated macromonomers as comonomers
  • Polyethylene copolymers containing vinyl-terminated macromonomers as comonomers
  • Polyethylene copolymers containing vinyl-terminated macromonomers as comonomers

Examples

Experimental program
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Effect test

preparation example Construction

[0211] In a preferred embodiment, the present invention relates to a process for the preparation of the ethylene / macromonomer copolymers described herein, said process comprising:

[0212] (i) polymerizing propylene in a first polymerization zone under conditions sufficient to produce a propylene macromonomer comprising at least 50% ethylenic unsaturation based on total unsaturated olefin chain ends; and

[0213] (ii) at least a portion of the propylene macromonomer is mixed with ethylene and C 3 -C 12 An optional additional monomer of an alpha-olefin in a second polymerization zone separate from said first polymerization zone under conditions sufficient to polymerize said monomer and macromonomer to produce an ethylene / macromonomer copolymer down contact.

[0214] As described above, the contents of the first reactor zone are transferred into the second reactor zone and become part of the reaction medium in the second reactor zone. The catalyst system employed in the first...

Embodiment 1-5

[0356] The polyethylene copolymers in Examples 1-5 were prepared in a continuous stirred tank reactor system with two reactors arranged in series. The first reactor is 0.5 liter and the second reactor is 1 liter. Both reactors were stainless steel autoclave reactors and were fitted with stirrers, water cooling / steam heating elements with temperature controls and pressure controls. Solvent and comonomer were first purified by passing through a 3-column purification system. The purification system consisted of an Oxiclear column (model #RGP-R1-500 from Labclear) followed by 5A and 3A molecular sieve columns. The purification column was regenerated periodically whenever there was evidence of reduced polymerization activity. Both 3A and 5A molecular sieve columns were internally regenerated under nitrogen atmosphere at set temperatures of 260°C and 315°C, respectively. Molecular sieve material was purchased from Aldrich. Oxiclear columns were regenerated at the original factor...

Embodiment 1

[0364] Ethylene copolymer prepared in embodiment 1 and Exceed TM A Van Gurp-Palmen plot comparing PE 2018, Exceed PE1018 and LD071-LR is shown in figure 2 middle. Exceeded TM Polyethylene 1018 ("Exceed PE 1018"), a mLLDPE available from ExxonMobil Chemical Company (Houston, Texas) has a MI of 1.0 dg / min, and 0.918 g / cm3 Density. Exceeded TM Polyethylene 2018 ("Exceed PE 2018"), a mLLDPE available from ExxonMobil Chemical Company (Houston, Texas) has an MI of 2.0 dg / min and 0.918 g / cm 3 Density. Both Exceed 2018 and Exceed 1018 are linear polymers with short chain branching. Polyethylene LD071.LR TM is an LDPE available from ExxonMobil Chemical Company (Houston, Texas) with an MI of 0.70 dg / min and 0.924 g / cm 3 Density. The phase angle of Example 1 is smaller than that of LD071.LR. LD071.LR has a high degree of long chain branching.

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Abstract

This invention relates to polyethylene copolymers comprising ethylene and vinyl terminated macromonomers. The polyethylene copolymers are achieved by copolymerization of ethylene and vinyl terminated macromonomers in a polymerization reactor, particularly in high yields and with a wide range of VTM molecular weights, that can be made at commercial rates.

Description

[0001] Inventor: Peijun Jiang [0002] Cross References to Related Applications [0003] This application claims the benefit of Provisional Application No. 61 / 758,611, filed January 30, 2013, and EP 13160934.9, filed March 25, 2013. technical field [0004] This invention relates to the polymerization of olefins, in particular to the preparation of polymers similar to linear low density polyethylene (LLDPE) and the like. Background technique [0005] Linear low density polyethylene (LLDPE) resins represent a very large and significant segment of the worldwide polyethylene (PE) blown and cast film market. These resins are synthesized by copolymerizing ethylene with an alpha-olefin comonomer such as 1-butene, 1-hexene or 1-octene. This results in an ethylene / α-olefin copolymer with many short chain branches (SCB) along the polymer backbone. The incorporation of 1-butene, 1-hexene or 1-octene comonomers resulted in ethyl (2 carbons), butyl (4 carbons) or hexyl (6 carbons) br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F2/00
CPCC08F290/042
Inventor 江培军
Owner EXXONMOBIL CHEM PAT INC
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