| http://www.w3.org/ns/prov#value | - It is prepared by reacting a halogen-terminated organosilicon compound of the general formula (2): (R1O)(3-p)(R2)pSi???R3???Sm???R4???X???(2) wherein R1, R2, R3, R4, m and p are as defined above, X is a halogen atom, with an anhydrous alkali metal sulfide or anhydrous alkali metal polysulfide of the general formula (3): M2Sr???(3) wherein M is an alkali metal and r is a positive number of 1 to 4 o
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