Patent ID: 6172157
Filing Date: 2001-01-09
Classification: C08K,C08L

Abstract:
A rubber composition prepared by blending 15 to 85 parts by weight of silica per 100 parts by weight of a rubber component comprising a natural rubber and/or diene base synthetic rubber and 1 to 15% by weight of a dispersion-improving agent based on the amount of said silica, wherein the dispersion-improving agent is a compound selected from the group consisting of silicone oils represented by formulae (IV) to (VII): ##STR41##wherein R.sup.5 represents an alkyl group or a phenyl group; 1.ltoreq.m+n.ltoreq.200 and n/(m+n).gtoreq.0.15; X.sup.1 represents an amino group or an N-substituted amino group represented by --R.sup.1 NR.sup.2 R.sup.3 or --R.sup.1 NHR.sup.4 NR.sup.2 R.sup.3 ; R.sup.1 and R.sup.4 represent --(CH.sub.2).sub.n -- (provided that n is 1, 2 or 3); R.sup.2 and R.sup.3 may be the same or different and represent a hydrogen atom, an alkyl group having 1 to 36 carbon atoms or a phenyl group; m and n represent the total number of the respective structural units and include a continuous one (block structure) and one disposed at random (random structure), ##STR42##wherein R.sup.6 represents an alkyl group or a phenyl group; 1.ltoreq.p+q.ltoreq.200 and q/(p+q).gtoreq.0.15; X.sup.2 represents a fatty acid ester group represented by --OCOR.sup.7 ; R.sup.7 represents an alkyl group or an alkenyl group each of which has 1 to 36 carbon atoms; p and q represent the total number of the respective structural units and include a continuous one (block structure) and one disposed at random (random structure), ##STR43##wherein R.sup.8 represents an alkyl group or a phenyl group; 1.ltoreq.r+s.ltoreq.200 and r/(r+s).gtoreq.0.15; X.sup.3 represents an epoxy-containing group represented by ##STR44##r and s represent the total number of the respective structural units and include a continuous one (block structure) and one disposed at random (random structure), ##STR45##wherein R.sup.9 represents an alkyl group or a phenyl group; 1.ltoreq.t+u.ltoreq.200 and u/(t+u).gtoreq.0.15; X.sup.4 represents an alkoxyl group; t and u represent the total number of the respective structural units and include a continuous one (block structure) and one disposed at random (random structure).