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Hydrogenated vinyl-polybutadienes

a technology of vinyl polybutadienes and polybutadienes, which is applied in the direction of special tyres, transportation and packaging, tyre parts, etc., can solve the problems of low elasticity of products at lower temperatures, affecting the physical properties of tires or tire components, and affecting the elasticity of products

Inactive Publication Date: 2005-09-08
ARLANXEO DEUT GMBH
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  • Claims
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Problems solved by technology

The hydrogenated vinyl-polybutadienes described are distinguished by high ozone resistance but have the disadvantage that the elasticity of the products at lower temperatures leaves something to be desired owing to their relatively high glass transition temperatures and enthalpies of fusion.
The hydrogenated polymers described therein have a high degree of crystallization with good mechanical properties and good resistance to heat and weathering, but they have the disadvantage that their elasticity leaves something to be desired especially at low temperatures owing to their highly crystalline nature.
For the application of such hydrogenated polymers, for example in the manufacture of tires or tire components, such molecular weights, or the Mooney viscosities associated therewith, are too low to obtain tires or tire components having good physical properties.

Method used

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  • Hydrogenated vinyl-polybutadienes
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Preparation of Vinyl-Polybutadienes as Starting Materials for the Hydrogenation

[0053] The polymerization of butadiene is carried out using n-butyllithium as the polymerization catalyst and cyclohexane as the solvent. The vinyl contents are adjusted by adding tetramethylethylenediamine (TMEDA) and tert.-butoxy-ethoxyethane (BEE) and by varying the polymerization temperature. The variations made and the effect on the vinyl content are summarized in Table 2 (TMEDA) and Table 3 (BEE).

[0054] The polymerizations were carried out in a 1.7-litre steel reactor. To that end, the empty reactor was filled to ⅔ with dry cyclohexane, under protecting gas. Butadiene was then metered in and a butadiene concentration of from 12 to 13 wt. % in cyclohexane was established. The randomizer TMEDA or BEE was then added, the vinyl content being controlled by varying the molar ratio of randomizer / BuLi (see Tables 2 and 3). After addition of the randomizer, BuLi was added in a concentration of from 1 to 2...

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Abstract

The hydrogenated vinyl-polybutadienes according to the present invention have degrees of hydrogenation of from 20 to 100%, Mooney viscosities in the range of from 10 to 150 Mooney units (ML 1+4 / 100° C.), glass transition temperatures (Tg) of ≦−57° C. and enthalpies of fusion (ΔH) of ≦30 J / g and having a microstructure with a) from 0 to 44 wt. % 1,2-vinyl-butadiene units of the formula b) from 20 to 64 wt. % 1,2-butylene units of the formula c) from 0 to 60 wt. % 1,4-butenylene units of the formula and d) from 0 to 60 wt. % 1,4-butylene units of the formula are outstandingly suitable for the production of rubber molded bodies of any kind, especially for the production of industrial rubber articles and of tires and tire components. The rubber molded bodies produced from the hydrogenated vinyl-polybutadienes according to the present invention have good resistance to ageing and good elasticity at low temperatures.

Description

FIELD OF THE INVENTION [0001] The present invention provides hydrogenated vinyl-polybutadienes having degrees of hydrogenation of from 20 to 100%, which are prepared by hydrogenation of vinyl-polybutadienes in a known manner. The hydrogenated vinyl-polybutadienes according to the present invention are distinguished by low glass transition temperatures and low enthalpies of fusion. The hydrogenated vinyl-poly-butadienes according to the present invention are highly resistant to ageing and have high elasticity even at low temperatures. They are therefore suitable for the production of rubber molded bodies of any kind, such as industrial rubber articles as well as tires and tire components, in which good resistance to ageing and good elasticity at low temperatures are required, as well as for the rubber modification of thermoplastics and duroplastics. BACKGROUND OF THE INVENTION [0002] Hydrogenated polybutadienes having a high vinyl content of from 85 to 100% are known from European Pa...

Claims

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Application Information

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IPC IPC(8): B60C1/00C08C19/02
CPCC08C19/02B60C1/00
Inventor STERE, CRISTINAOBBRECHT, WERNER
Owner ARLANXEO DEUT GMBH
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