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Method for producing modified polymer rubber
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A technology of active polymer and polymer, applied in the field of producing modified polymer rubber with excellent impact elasticity, can solve the problems of unsatisfactory, copolymer without impact elasticity, etc.
Inactive Publication Date: 2011-12-14
SUMITOMO CHEM CO LTD
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However, the copolymer has a problem that automobile tires comprising the copolymer are not satisfactory from the viewpoint of fuel cost saving because the copolymer does not have sufficient impact elasticity
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Embodiment 1
[0059] A 20 liter internal volume stainless steel polymerization reactor was washed, dried, and then purged with dry nitrogen. 1405 g of 1,3-butadiene, 395 g of styrene, 328 g of tetrahydrofuran, 10.2 kg of hexane and 12.8 mmol of n-butyllithium (n-hexane solution) were charged to the reactor. Polymerization was carried out at 65° C. under stirring for 3 hr, whereby a polymerization mixture was obtained.
[0060] 1.70 g (2.76 mmol) of 1,3,5-tris(3-trimethoxysilylpropyl) isocyanurate was added to the obtained polymerization mixture, and the obtained mixture was reacted at 65° C. for 30 min while stirring.
[0061] To the resulting reaction mixture was added 10 ml of methanol, and the resulting mixture was further stirred at 65° C. for 5 min, whereby a reaction mixture was obtained.
[0062] The resulting reaction mixture was taken out and mixed with 10 g of 2,6-di-tert-butyl-p-cresol (SUMILIZERBHT, manufactured by Sumitomo Chemical Co., Ltd.), after which most of the hexane wa...
Embodiment 2
[0064] Repeat Example 1 to obtain a modified polymer rubber, but (i) change the amount of n-butyllithium (n-hexane solution) to 11.3 mmol, (ii) add 0.039 g (0.23 mmol) tetrachloro Silica coupling agent, and (iii) 2.70 g (4.39 mmol) of 1,3,5-tris(3-trimethoxysilylpropyl)isocyanurate were added 15 min after the addition of silicon tetrachloride.
Embodiment 3
[0066] Repeat Example 1 to obtain a modified polymer rubber, but (i) change the amount of n-butyllithium (n-hexane solution) to 12.0 mmol, (ii) add 0.041 g (0.24 mmol) tetrachloro Silica, and (iii) 1.43 g (2.33 mmol) of 1,3,5-tris(3-trimethoxysilylpropyl)isocyanurate were added 15 min after the addition of silicon tetrachloride.
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Abstract
A method for producing modified polymer rubber, comprising the steps of: (1) making a conjugated diene monomer or its combination with an aromatic vinyl monomer, in a hydrocarbon solvent, in an alkali metal catalyst or specified In the presence of an alkali metal compound, carry out polymerization to form an active polymer with an alkali metal end group; and (2) couple the resulting active polymer with an alkali metal end group to a prescribed isocyanurate compound or to a prescribed The combination of reagents is carried out in a hydrocarbon solvent.
Description
technical field [0001] The present invention relates to a method for producing modified polymer rubbers having excellent impact elasticity. The modified polymer rubber produced according to the method is very suitable for the production of automobile tires with excellent fuel cost saving properties. Background technique [0002] Styrene-butadiene copolymers produced by the emulsion polymerization method are known as rubbers for the manufacture of automobile tires. However, the copolymer has a problem that an automobile tire comprising the copolymer is not satisfactory from the viewpoint of fuel cost saving because the copolymer does not have sufficient impact elasticity. [0003] In order to produce rubber with excellent impact elasticity, JP 60-72907A discloses a production method comprising, in a hydrocarbon solvent, using an organolithium compound as an initiator, and using a Lewis base such as an ether as a microstructure control agent, A step of copolymerizing butadie...
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