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Use of catalysts for the metathesis degradation of nitrile rubber

A metathesis reaction, nitrile rubber technology, applied in the new technology field of nitrile rubber degradation, can solve the problems of nitrile rubber instability, solution instability and so on

Inactive Publication Date: 2007-03-28
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] The above-mentioned process for the degradation of nitrile rubber by metathesis and the catalysts used for this purpose have the following disadvantages: the solutions of these catalysts are not stable, especially in the presence of oxygen in the air, therefore, fresh catalyst must always be replenished
[0031] However, our studies show that this Piers(I) catalyst does not degrade NBR in NBR metathesis, but specifically causes the gelation of NBR
This makes nitrile rubber unstable

Method used

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  • Use of catalysts for the metathesis degradation of nitrile rubber
  • Use of catalysts for the metathesis degradation of nitrile rubber
  • Use of catalysts for the metathesis degradation of nitrile rubber

Examples

Experimental program
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Embodiment Construction

[0119] The synthesis of the catalyst used in the present invention

[0120] Tetrafluoroboric acid [dichloro(1,3-di-yldihydroimidazolylidene)(tricyclohexylphosphine-carbene)ruthenium] (2) in B2;

[0121] [dichloro(1,3-two-yl dihydroimidazolyl) (tricyclohexylphosphine-carbene) ruthenium in B3] [boric acid tetrakis(3,5-tetrafluoromethylphenyl)] (3 )

[0122] Tetrafluoroboric acid [dichloro(4,5-dibutyl-1,3-dihydroimidazolylidene)(tricyclohexylphosphine-carbene)ruthenium] in B8 (6)

[0123] B1 carbonation (carbido) (dichloro) -1,3-two-base dihydroimidazole groups (tricyclohexylphosphine) Ruthenium(1)

[0124]

[0125] (1,3-Dihydroimidazolyl) (PCy 3 ) Cl 2 Ru=CHPh (0.42 g; 0.5 mmol) and diethyltrans-3-methylene-1,2-cyclopropanedicarboxylate (0.10 g; 0.5 mmol) were placed in a 25 ml Schlenk vessel. Under nitrogen protective gas, dry CH was then added 2 Cl 2 (5 mL) and the resulting reddish brown solution was stirred for 12 hours. The solvent was removed from the resu...

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Abstract

A novel process for producing degradation of nitrile rubbers by metathesis reaction in the presence of a ruthenium- or osmium-based catalyst containing an optionally substituted imidazolidine ligand and a carbene ligand containing a phosphonium radical.

Description

technical field [0001] The present invention relates to a new process for degrading nitrile rubber by metathesis reaction using ruthenium-based or osmium-based catalysts. Background technique [0002] Hydrogenated nitrile rubber, also abbreviated "HNBR", is obtained by hydrogenating nitrile rubber, which is abbreviated "NBR". [0003] For the purposes of the present invention, the term nitrile rubber means a copolymer of at least one unsaturated nitrile and at least one conjugated diene and possibly further comonomers. [0004] Hydrogenated nitrile rubber is a specialty rubber with very good heat resistance, outstanding ozone and chemical resistance and excellent oil resistance. [0005] The above mentioned physical and chemical properties of HNBR are correlated with its very good mechanical properties, especially very high wear resistance. Therefore, HNBR has been found to have very wide applications in many fields. For example, HNBR is used as seals, rubber hoses, belts...

Claims

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Application Information

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IPC IPC(8): C08F8/50C08F236/12C08F8/04C08F4/42
CPCB01J31/2278B01J2231/543C08C19/02B01J2531/825B01J31/2273C08C19/08B01J31/2265B01J2531/821
Inventor W·奥布雷希特J·M·米勒O·努伊肯H·伯克L·梅卡L·特里斯奇科瓦
Owner LANXESS DEUTDCHLAND GMBH