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Process for synthesis of ethylene polymers

A polymer and process technology used in the synthesis of ultra-high molecular weight polyethylene

Inactive Publication Date: 2014-09-17
RELIANCE INDUSTRIES LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is a challenge to synthesize DUHMWPE in a simple and efficient manner

Method used

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  • Process for synthesis of ethylene polymers
  • Process for synthesis of ethylene polymers
  • Process for synthesis of ethylene polymers

Examples

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[0089] 1) Optimal catalyst concentration under operating conditions

[0090] A 1.0 dm3 reactor was charged with 500 cm3 of Vaso containing the desired amount of P-MAO and catalyst, resulting in a molar ratio of about 100 to 200. The initial reactor temperature was approximately 25°C and stirring was maintained at 500 rpm. The reactor was then pressurized with 2 bar of ethylene to replenish the consumed ethylene and keep the pressure constant. Aggregation kinetics were monitored over time. figure 1 The respective temperature curves can be seen in . These examples are aimed at achieving an optimized catalyst concentration under operating conditions, keeping the polymerization temperature rise below 45°C, and preventing fusion between polymer molecules. The experiment was also used to freeze the polymerization time to achieve the desired molecular weight. Under normal circumstances, traditional comparison experiments are carried out under 0 ℃-10 ℃ of temperature and ethylen...

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Abstract

The present invention relates to a non-cryogenic process for the large scale synthesis of disentangled ultra high molecular weight polyethylene (DUHMWPE) polymers. The process comprises of the following steps: a. mixing FI catalyst of formula I with a hydrocarbon solvent containing poly-methyl aluminoxane (P-MAO) co- catalyst in a vessel under stirring before polymerization or directly in the polymerization vessel at a temperature ranging between 25 DEG C and 29 DEG C under a dry Nitrogen atmosphere; and lower concentration of co-catalyst resulting in the associated benefits as described earlier in the claims and descriptions. b. pressurizing ethylene in the polymerization vessel and polymerizing ethylene in a solution or a suspension, continuously or batch wise, in one or more stages at a temperature is in the range of 30 DEG C to 50 DEG C.

Description

field of invention [0001] This invention relates to the synthesis of polyethylene. [0002] In particular, the present invention relates to the synthesis of disentangled ultra-high molecular weight polyethylene (DUHMWPE). Background technique [0003] Ultra-high molecular weight polyethylene (UHMWPE) is a type of polyolefin consisting of extremely long polyethylene chains whose strength is determined primarily by the length of each individual molecule (chain). The van der Waals bonds between molecules are relatively weak for each atom that overlaps between molecules, but because the molecules are very long, large overlaps can exist, increasing the ability to carry large shear forces from molecule to molecule. Each chain is connected to other chains with so many van der Waals bonds that the overall intermolecular strength is high. [0004] Polar groups present in most polymers readily bind water. UHMWPE is not easy to absorb water, because there are no polar groups in UHMW...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/64
CPCC08F4/76C08F10/02C08F4/64048C08F110/02C08F2500/01C08F2500/17
Inventor K·R·萨尔马A·B·马图尔R·扎斯拉S·帕德马纳班沙希坎特V·帕特尔
Owner RELIANCE INDUSTRIES LIMITED
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