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Multi-reactor solution polymerization, polyethylene and polyethylene films

A polyethylene and reactor technology, applied in the multi-reactor solution polymerization, polyethylene and polyethylene film fields, can solve problems such as undisclosed or expected problems

Active Publication Date: 2022-07-29
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this publication fails to disclose or anticipate the advantages achievable by feeding fresh monomer (and optionally fresh catalyst) into the third reactor

Method used

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  • Multi-reactor solution polymerization, polyethylene and polyethylene films
  • Multi-reactor solution polymerization, polyethylene and polyethylene films
  • Multi-reactor solution polymerization, polyethylene and polyethylene films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A

[0428] Embodiment A. A polyethylene product composition comprising:

[0429] 35 to 75 wt% of the first polyethylene having a density of 0.875 to 0.916 g / cm 3 , melt index I 2 0.1 to 5dg / min and molecular weight distribution M w / M n ethylene copolymers of 1.6 to 2.4;

[0430] 10 to 40 wt % of a second polyethylene selected from the group consisting of a density of 0.945 to 0.975 g / cm 3 , melt index I 2 1.0 to 20 dg / min and molecular weight distribution M w / M n An ethylene copolymer or ethylene homopolymer of 1.6 to 2.4; and

[0431] 10 to 40 wt% of a third polyethylene having a density of 0.880 to 0.936 g / cm 3 , melt index I 2 0.1 to 100 dg / min and molecular weight distribution M w / M n greater than the molecular weight distribution M of the first or second ethylene polymer component w / M n ethylene copolymer;

[0432] The density of the polyethylene product composition is less than or equal to 0.939 g / cm 3 , melt index I 2 From 0.1 to 10 dg / min, with a unimod...

Embodiment approach LL

[0472] Embodiment LL. A film layer comprising the ethylene polymer composition of Embodiment A.

[0473] Implementation MM. The film layer of Embodiment LL, wherein the film has a machine direction (MD) 1% secant modulus > 170 MPa.

[0474] Implementation NN. The film layer of Embodiment LL or MM, wherein the film has a dart impact strength > 500 g / mil.

[0475] Embodiment OO. The film layer of Embodiment LL, MM, or NN, wherein the film has a seal initiation temperature (SIT) < 105°C.

[0476] Embodiment PP. The film layer of embodiment LL, MM, NN, or OO, wherein the film has a slow puncture resistance value > 65 J / mm.

Embodiment approach QQ

[0477] Implementation QQ. The film layer of Embodiment LL, MM, NN, OO, or PP, wherein the film has a machine direction (MD) tear of > 250 g / mil.

[0478] Implementation RR. The film layer of Embodiment LL, MM, NN, OO, PP, or QQ, wherein the film has a machine direction (MD) tensile strength at break > 40 MPa.

[0479] Implementation SS. The film layer of Embodiment LL, MM, NN, OO, PP, QQ, or RR, wherein the film has a haze < 14%.

[0480] Implementation TT. A film layer with dart impact strength ≥ 600 g / mil, MD 1% secant modulus ≥ 170 MPa, slow puncture value ≥ 65 J / mm, machine direction (MD) tear ≥ 250 g / mil , and the sealing initiation temperature (SIT)≤105℃.

[0481] Embodiment UU. The film layer of Embodiment TT, wherein the film has a MD tensile strength at break > 40 MPa.

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Abstract

The present disclosure relates to a continuous solution three-reactor polymerization process. Process solvent, ethylene, optional comonomer, optional hydrogen, and a single site catalyst system are injected into the first and second reactors configured in parallel with each other. The third reactor receives effluent from the first reactor, the second reactor, or a combination of the first and second reactors. Fresh monomer is fed into the third reactor for further polymerization and to obtain the final polyethylene product.

Description

technical field [0001] Disclosed herein is a polymerization process utilizing at least three reactors, wherein two reactors are configured in parallel. Ethylene monomer was fed into each of the three reactors. Using this method, new multimodal polyethylene compositions are obtained while achieving process efficiency improvements. Background technique [0002] Solution polymerization processes are generally carried out at temperatures above the melting point of the ethylene homopolymer or copolymer product produced. In a typical solution polymerization process, the catalyst components, solvent, monomers and hydrogen are fed under pressure to one or more reactors. [0003] For ethylene polymerization or ethylene copolymerization, reactor temperatures may range from about 80°C to about 300°C, while pressures typically range from about 3 to about 45 MPag. The produced ethylene homopolymer or copolymer remains dissolved in the solvent under reactor conditions. The residence t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08F210/16C08L23/04C08L23/08
CPCC08F4/65908C08F4/65912C08F2420/04C08J2423/06C08L2205/025C08J5/18C08J2323/08C08J2423/08C08L23/0815C08L2203/16C08L2205/03C08F210/16C08F2/001C08F110/02C08F2500/03C08F210/14C08F2500/06C08F2500/12C08F2500/10C08F2500/17C08F4/6592C08L23/06C08F10/02C08F210/02C08F2/01C08F2/04C08J2323/06C08L2205/02C08L2207/062C08L2207/064C08L2207/066C08L2308/00C08L2314/06C08F2500/07C08F2500/08C08F4/76
Inventor X.王N.卡泽米S.布朗L.范阿塞尔唐克S.萨洛蒙斯
Owner NOVA CHEM (INT) SA
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