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Hydrogenated copolymers from non-substituted and substituted conjugated dienes

A technology of hydrogenated copolymer and conjugated diene used in the production of engine mounts

Inactive Publication Date: 2005-11-09
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also there is no suggestion of any technological characteristics which would make the product suitable for an intended use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation of the copolymers according to the invention can be carried out both batchwise and continuously. The preparation of the random copolymer and its hydrogenation can be carried out without isolating the random copolymer from the polymer solution prior to hydrogenation. Hydrogenation can also take place in the same reactor in which the polymerization is carried out.

[0026] It is of course possible to blend the resulting random hydrogenated copolymer with other rubbers such as natural rubber, with known synthetic rubbers such as polybutadiene, styrene / butadiene rubber, butyl rubber, ethylene / propylene rubber (EPM and EPDM), hydrogenated nitrile rubber, polychloroprene rubber, nitrile rubber, ethylene / vinyl acetate copolymer and chlorinated or chlorosulfonated polyethylene blends.

[0027] The ratios in which the rubbers are mixed separately with one another can easily be determined by preliminary experiments and depend on the subsequent intended use of the...

Embodiment

[0030] 1. Preparation of Butadiene / Isoprene Random Copolymer Using Nd Catalyst

[0031] The preparation of butadiene / isoprene random copolymers was carried out in a 1.7 liter steel autoclave using the following basic recipe, using a prefabricated neodymium-based catalyst in the polymerization:

[0032] Cyclohexane 600g

[0033] Monomer mixture containing butadiene and isoprene 100g

[0034] DIBAH 2.5mmol / 100g monomer

[0035] Prefabricated neodymium catalyst 0.25mmol / 100g monomer

[0036] The preformation of the neodymium catalyst was carried out at a concentration of 0.1 M (based on neodymium) in cyclohexane under argon in a Schlenk vessel. During prefabrication, the individual catalyst components were combined at room temperature in the following order: cyclohexane, diisobutylaluminum hydride, branched chain alkane carboxylate neodymium (neodymium versatate) and ethylaluminum sesquichloride (molar ratio: n DIBAH / n Nd / n Cl =10:1:2). The preformed catalysts were store...

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PUM

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Abstract

The random, hydrogenated copolymers according to the present invention of unsubstituted conjugated dienes and substituted conjugated dienes, having a glass transition temperature of <=-60 DEG C, an enthalpy of fusion of <=100 J / g and a content of residual double bonds in the range from 0 to 80%, are suitable for the production of rubber moldings of all kinds which have good resistance to ageing and high resilience at low temperatures. In particular, various tire components and industrial rubber articles may be mentioned as rubber moldings. The copolymers are also suitable for the rubber modification of brittle thermoplastics.

Description

technical field [0001] The present invention relates to randomly hydrogenated copolymers of unsubstituted conjugated dienes and substituted conjugated dienes having a low glass transition temperature and low melting enthalpy, prepared by hydrogenating the corresponding unhydrogenated copolymers in a conventional manner . The inventive random hydrogenated copolymers containing unsubstituted and substituted dienes are very resistant to aging and have high resilience even at low temperatures. Therefore, they are very suitable for the production of various rubber moldings that require excellent aging resistance and excellent resilience at low temperatures. They are particularly suitable, for example, for the production of engine mounts, since they do not harden even under high-frequency stress due to their low glass transition temperature, and for the production of tire sidewalls, where a combination of good aging resistance is required , good co-vulcanization behavior and high ...

Claims

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Application Information

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IPC IPC(8): C08C19/02
CPCC08C19/02
Inventor C·施泰尔W·奥布雷希特U·宗德尔曼G·西尔维斯特
Owner LANXESS DEUTDCHLAND GMBH
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