MODIFIED POLYSILOXANES, RUBBER COMPOSITIONS AND TIRE TREAD RUBBER COMPOSITIONS CONTAINING THE SAME, AND REACTIVE PLASTICIZER

摘要

Polysiloxanes having siloxane structures of general formulae (1) and (2) or (1) and (3), wherein R<1> is C1-C6 alkyl or C1-C21 acyl; R<2> is C2-C4 alkylene; R<3> is a monovalent hydrocarbon group; a is 1 to 200; b is 1 to 200; c is 1 to 200; t is 2 or 3; and s is 1 to 100. A siloxane-base reactive plasticizer having in the molecule both at least one plasticizing moiety selected from among organic groups having an ester linkage and aliphatic and aromatic hydrocarbon groups and at least one reactive group selected from among alkoxysilyl groups and acyloxysilyl groups, the plasticizing moiety accounting for at least 50 wt.% of the plasticizer.