Method for increasing diene conversion in EPDM type polymerizations

A monomer and polymer technology, applied in the field of polymer composition, can solve the problems of high diene content and high production cost, and achieve the effect of high propylene content

Inactive Publication Date: 2001-04-18
EXXON CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of this method is the high level of unreacted diene due to the addition of diene in the second stage reaction with low catalyst concentration
Higher levels of diene lead to higher production costs and problems when vulcanizing polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1 (Experiment 173A)

[0108] Polymerization was carried out in series reactors with dimethylsilylene bis(indenyl) hafnium dimethyl [μ-(CH 3 ) 2 Si(indenyl) 2 Hf(CH 3 ) 2 ], CatA made a 51:49 blend of EPDM terpolymer in R1 and EP copolymer in R2, the catalyst was tetrakis(pentafluorophenyl)boronic acid N,N-dimethylanilinium salt [ DMAH + B - (pfp) 4 ], activated by Cocat1. The catalyst components were activated by dissolving in dry toluene in a 1 / 1 molar ratio and then transferred to vessels for metering to the reactor. Reactor conditions and feed rates are shown in Table 1. Activated catalyst entered R1 only, and catalyst efficiency was calculated by dividing the total polymerization rate by the Cat A feed rate. A monomer mixture (3 L / h) of ethylene, propylene, and 5-ethylidene-2-norbornene (ENB) in hexane solvent was fed to the first reactor, but only ethylene and propylene were fed to the second reactor . The polymers produced in the first and seco...

Embodiment 2

[0109] Example 2 (Experiment 185A)

[0110] Similar to Example 1, the polymerization was carried out in a series of reactors using CatA and Cocat1 to make a 25:75 blend of EPDM / EP polymers. The polymers produced in the first and second reactors also had a similar ethylene composition, but a much lower total ethylene content (15.6% in R1 and 13.3% in R2). Diene conversion in the first reactor was 10.7%, producing a polymer with 5.2% ENB content, but even though no more ENB was added in R2, 20.2% of the remaining ENB was converted in R2 A blend containing 3.5% ENB was obtained for an overall conversion of ENB of 28.7%. This shows that the use of cascade reactors can increase ENB conversion by 168%.

Embodiment 3

[0111] Example 3 (Experiment 185B)

[0112] Similar to Example 2, the polymerization was carried out in a series of reactors using CatA and Cocat1 to make a 25:75 blend of EPDM / EP polymers. The polymers produced in the first and second reactors also had similar ethylene compositions but lower total ethylene content (16.9% in R1 and 15.7% in R2). In this experiment, the total incorporation of diene was higher. Diene conversion in the first reactor was 10.9%, producing a polymer with 6.7% ENB content, but even though no more ENB was added in R2, 21.7% of the remaining ENB was converted in R2 A total blend containing 4.7% ENB was obtained for an overall conversion of ENB of 30.2%. This shows that the ENB conversion can be increased by 177% using cascade reactors.

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Abstract

The present invention relates to the use in multi-stage reactors selected from ethylene, C 3 -C 8 Monomers of alpha-olefins and non-conjugated dienes Process for preparing polymer compositions such as EPDM compositions. In particular, the present invention relates to a method for increasing the conversion rate of diene monomer by using multi-stage reactors and metallocene catalyst system when preparing the above polymer composition.

Description

Background of the invention [0001] The present invention relates to the use in multi-stage reactors selected from ethylene, C 3 -C 8 Monomers of alpha-olefins and non-conjugated dienes Process for preparing polymer compositions such as ethylene propylene terpolymer (EPDM) compositions. In particular, the present invention relates to the use of multi-stage reactors and metallocene catalyst systems to increase the conversion of diene monomers in the preparation of the above polymer compositions. [0002] EPDM is a terpolymer or a polymer composed of three different types of monomers. The monomers for making EPDM are: 1) ethylene, 2) propylene or some other higher alpha-olefin, and 3) non-conjugated dienes. Ethylene and propylene monomers provide a saturated backbone which is interrupted by the introduction of non-conjugated diene monomers which provide unsaturation in the EPDM chain. The presence of unsaturated groups is necessary for vulcanization or crosslinking of EPDM to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/01C08F2/06C08F4/60C08F4/6192C08F4/659C08F4/6592C08F10/00C08F210/06C08F210/16C08F210/18C08F297/08
CPCC08F4/65908C08F210/18C08F4/65927C08F4/65912C08F210/16C08F210/06C08F10/00C08F2/001C08F2/06C08F2500/17C08F2500/03C08F2500/08C08F2500/15C08F210/14C08F2500/25C08F4/63908C08F4/63912C08F4/63927
Inventor B·A·哈灵顿C·考兹维斯S·达塔B·J·福里J·F·小沃尔泽D·J·克罗泽
Owner EXXON CHEM PAT INC
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