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Vulcanizable polymer composition comprising a low molecular weight optionally hydrogenated nitrile rubber

A technology of nitrile rubber and composition, applied in the direction of organic compound/hydride/coordination complex catalyst, chemical/physical process, physical/chemical process catalyst, etc., can solve the loss of products, no document discloses effective methods, long-term Completion time etc.

Inactive Publication Date: 2012-05-30
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is not even a document disclosing an efficient method for isolating this very low molecular weight rubber
Due to this low molecular weight rubber, the use of standard separation techniques such as coagulation with alcohols (methanol, isopropanol, ethanol, etc.) Completion time

Method used

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  • Vulcanizable polymer composition comprising a low molecular weight optionally hydrogenated nitrile rubber
  • Vulcanizable polymer composition comprising a low molecular weight optionally hydrogenated nitrile rubber
  • Vulcanizable polymer composition comprising a low molecular weight optionally hydrogenated nitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0371] Preparation of Curable Polymer Compositions

[0372] A curable polymer composition is prepared by mixing together the essential ingredients, namely a low molecular weight optionally hydrogenated nitrile rubber (i) and at least one crosslinking agent (ii), and optionally a filler (iii ) and optionally other auxiliary compounds (iv), suitably at elevated temperature in the range from 25°C to 200°C. Optionally, typical mixing times are no more than one hour and mixing times in the range of 2 to 30 minutes are usually suitable. If the curable polymer composition is prepared without solvent or recovered from solution, the mixing may suitably be carried out in an internal mixer, such as an internal mixer or a Haake or Brabender mini mixer. The two-roll mill mixer also provides good dispersion of additives in the elastomer. An extruder also provides good mixing and enables shorter mixing times. Also, due in part to the viscosity of the optionally hydrogenated nitrile rubber...

preparation example

[0379] Concentration of cement 15% by weight

[0380] Co-Olefin 1-Hexene

[0381] Co-olefin concentration 4phr

[0382] Metathesis catalyst: 1,3-bis-(2,4,6-trimethylphenyl)-2-imidazolidinylidene) (tricyclohexylphosphine)-(phenylmethylene)ruthenium dichloride (th Second Generation Grubbs Catalyst (NGG)) (Materia Inc., USA).

[0383] Hydrogenation catalyst Tris-(triphenylphosphine)rhodium chloride (Wilkinson's catalyst) (Umicore AG, Germany).

[0384] Catalyst dosages are shown in Tables 1, 2 and 3.

[0385] Solvent Monochlorobenzene (MCB)

[0386] (Comparison #1) A statistical butadiene-acrylonitrile copolymer having an acrylonitrile content of 34 mol% and a Mooney viscosity (ML(1+4) at 100°C) of 29 MU. (LANXESS Germany GmbH, Germany).

[0387] (Comparative #2) A statistical butadiene-acrylonitrile copolymer having an acrylonitrile content of 34 mol% and a Mooney viscosity (ML(1+4) at 100°C) of 35 MU. (LANXESS Germany GmbH, Germany).

[0388] *"Cement concentration"...

example 1-4

[0391] 75g of Dissolve in 500 g of monochlorobenzene in a 1 L container. When the nitrile rubber is completely dissolved, add 4phr of 1-hexene into the container, and stir the solution for 2h until 1,3-bis-(2,4,6-trimethylphenyl)-2-imidazolidinylidene) (Tricyclohexylphosphine)-(phenylmethylene)ruthenium dichloride was dissolved in 20 mL of MCB and added to the 1 L vessel. The reaction mixture was allowed to react while stirring at a temperature of 22 °C for 12 h. After the end of the set time allotment, the solution was subjected to GPC analysis.

[0392] Table 1:

[0393]

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Abstract

The present invention relates to vulcanizable polymer compositions comprising a very low molecular weight optionally hydrogenated nitrile rubber, at least one cross-linking agent, optionally at least one filler and optionally one or more further auxiliary products for rubbers, a process for preparing such vulcanizable polymer compositions, furtheron a process for vulcanizing such polymer compositions and the resulting vulcanizate, preferably as a shaped article.

Description

technical field [0001] The present invention relates to a curable polymer composition comprising at least one very low molecular weight optionally hydrogenated nitrile rubber, at least one crosslinking agent, optionally at least one filler, and optionally Other auxiliary products for rubber compounds, a method for curing such polymer compositions and vulcanizates obtained by curing the curable polymer compositions. Background technique [0002] Nitrile rubber, commonly referred to as "NBR", is used as a starting material for the production of hydrogenated nitrile rubber (commonly referred to as "HBNR"). Nitrile rubber is a copolymer of at least one unsaturated nitrile, at least one conjugated diene and optionally other copolymerizable comonomers. HNBR is typically prepared by selective hydrogenation of NBR. The degree of hydrogenation of the copolymerized diene units generally ranges from 50% to 100%. [0003] NBR and HNBR are specialty rubbers with attractive property pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C08C19/02C08C19/08C08L9/02C08L15/00C08K5/14
CPCC08L9/02C08L15/005Y10T428/1352C08C19/02C08K5/14B01J31/22
Inventor 马蒂亚斯·佐德曼克里斯托弗·昂格尤利娅·玛丽亚·米勒托马斯·柯尼希凯文·库尔巴巴
Owner LANXESS DEUTDCHLAND GMBH