Rubber composition, production method therefor and tire
a technology of composition and rubber, which is applied in the direction of tyre parts, special tyres, transportation and packaging, etc., can solve the problems of less likely to be uniformly dispersed and coagulation of silica particles, and achieve the effect of suppressing the increase in increasing and controlling the dispersibility of silica
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synthesis example 1
of Conjugated Diene Polymer; Synthesis of Conjugated Diene Polymer (A)
[0140]Firstly, in an autoclave reactor having an internal volume of 5 liters in which the atmosphere was replaced with nitrogen, 2,750 g of cyclohexane as a solvent, 50 g of tetrahydrofuran as an adjuster for adjusting the vinyl bond content, and 125 g of styrene and 375 g of 1,3-butadiene as monomers were charged. After adjusting the temperature in the reactor to 10° C., a cyclohexane solution containing 5.8 mmol of n-butyllithium as a polymerization initiator was added thereto to initiate polymerization. The polymerization was conducted under adiabatic conditions, and the maximum temperature reached 85° C.
[0141]After confirmation that the polymerization conversion reached 99%, the polymerization was further conducted for 5 minutes from the time when the polymerization conversion reached 99%. Thereafter, 10 g was sampled from a reaction solution obtained, namely a polymer solution containing a copolymer (base pol...
synthesis example 2
of Conjugated Diene Polymer; Synthesis of Conjugated Diene Polymer (A)
[0144]A conjugated diene polymer (hereinafter also referred to as “conjugated diene polymer (A2)”) having a hydrocarbyloxysilyl group and a tertiary amino group as specific functional groups at one molecular end was obtained by the same technique as in Synthesis Example 1 of conjugated diene polymer with the exception that 4.96 mmol of 1-[3-(triethoxysilyl)-propyl]-4-methylpiperazine was used as a compound for functional group introduction in place of 4.96 mmol of N,N-bis-(trimethylsilyl)aminopropylmethyldiethoxysilane.
[0145]For the resulting conjugated diene polymer (A2), the bonded styrene content, vinyl bond content, glass transition temperature and Mooney viscosity were measured. The results thereof are shown in Table 2, together with the weight average molecular weight of the polymer before the specific functional group introduction, namely the weight average molecular weight of the base polymer.
synthesis example 3
of Conjugated Diene Polymer; Synthesis of Conjugated Diene Polymer (A)
[0146]A conjugated diene polymer (hereinafter also referred to as “conjugated diene polymer (A3)”) having a hydrocarbyloxysilyl group and a secondary amino group as specific functional groups at one molecular end was obtained by the same technique as in Synthesis Example 1 of Conjugated diene polymer with the exception that 4.96 mmol of 3-(4-trimethylsilyl-1-piperazino)propyltriethoxysilane was used as a compound for functional group introduction in place of 4.96 mmol of N,N-bis-(trimethylsilyl)aminopropylmethyldiethoxysilane.
[0147]For the resulting conjugated diene polymer (A3), the bonded styrene content, vinyl bond content, glass transition temperature and Mooney viscosity were measured. The results thereof are shown in Table 2, together with the weight average molecular weight of the polymer before the specific functional group introduction, namely the weight average molecular weight of the base polymer.
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