SILANE COUPLING AGENT COMPOSITION COMPRISING SILANE COMPOUND AND PROTEIN MODIFYING AGENT, AND RUBBER COMPOSITION COMPRISING THE SAME

[Problem to be solved] [0002] To provide a rubber composition which suppresses poor mixing or poor dispersion from occurring between an organic polymer material derived from natural rubber and an inorganic material such as silica and exhibits excellent viscoelastic properties, and a silane coupling agent composition used in the same. [0003] [Means to Solve the Problem] [0004] A silane coupling agent composition comprising a silane compound represented by Formula (1): wherein R, R, and R each independently represents a hydrocarbon group optionally containing an oxygen atom or a nitrogen atom, or a hydrogen atom; L represents a hydrocarbon group optionally containing at least one hetero atom selected from the group consisting of nitrogen, oxygen, and sulfur; a is an integer of 0 or 1; b is an integer of 0 or 1; c is each independently an integer of 0 or 1; d is each independently an integer of 0 or 1; e is an integer from 0 to 5; R, R, R, and R represent a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbon atoms, or one of R or R and R or R may form a cross-linked structure represented by -(CH)-; and f is an integer from 1 to 5; R, R, R and R represent a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbon atoms, or one of R or R and R or R may form a cross-linked structure represented by -(CH)-; and g is an integer from 1 to 5; R is a hydrogen atom, a methyl group or an alkyl group having 2 to 8 carbons, and R is a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbons, where R and R bond to each other to form a double bond, and R, R, and R are a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbons or R and R bond to each other to form a double bond, and R, R, and R are a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbons; or R and R may bond to each other to form a 4 to 9 membered alicyclic hydrocarbon, where R and R bond to each other to form a double bond, and R, R, and R are a hydrogen atom, a methyl group or an alkyl group having 2 to 10 carbons; and a protein modifying agent.