| abstract |
A method for producing a modified polymer which can easily introduce an alkoxysilyl group into a main chain structure or into a molecular end of a polymer, a rubber composition using the polymer, and the like are provided. The acid-base properties of a system comprising the polymer obtained by decomposition by oxidative cleavage of a carbon-carbon double bond in the main chain to lower the molecular weight and a trifunctional molecule have been reported having an alkoxysilyl group in the structure as represented by the formula (A), changed so that the system is changed to a basic system when the system is acidic, and that the system is changed into an acidic system, when the system is basic, to combine the decomposed polymer and the trifunctional molecule, thereby introducing the alkoxysilyl group into the main chain. Further, the acid-base properties of a system comprising the polymer obtained by decomposition by oxidative cleavage of a carbon-carbon double bond to lower the molecular weight and a functional molecule having an alkoxysilyl group Group as represented by the formula (a) is changed in the same manner as above to combine the decomposed polymer and the functional molecule, thereby introducing the alkoxysilyl group into a molecular terminal. |