Disclosed is 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. Also disclosed is a silane coupling agent composition comprising a silane compound represented by Formula (1):

##STR00001##

wherein each variable is as defined herein.

Disclosed is 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. Also disclosed is a silane coupling agent composition comprising a silane compound represented by Formula (1):

##STR00001##

wherein each variable is as defined herein.

Provided is a polycarbonate-based resin composition including: a polycarbonate-polyorganosiloxane copolymer (A); and at least one kind of compound (B) selected from the group consisting of an antioxidant, a dye, a release agent, a light-diffusing agent, a flame retardant, a UV absorber, a silicone-based compound, an epoxy compound, and a polyether compound, wherein the polycarbonate-polyorganosiloxane copolymer (A) contains a polycarbonate block (A-1) and a polyorganosiloxane block (A-2), and satisfies the following requirements (1) to (3): (1) the content of the polyorganosiloxane block (A-2) is from more than 40 mass % to 70 mass % or less; (2) the copolymer has a viscosity-average molecular weight of from 10,000 to 23,000; and (3) the copolymer contains a specific polycarbonate block as the polycarbonate block (A-1).

Provided is a polycarbonate-based resin composition including: a polycarbonate-polyorganosiloxane copolymer (A); and at least one kind of compound (B) selected from the group consisting of an antioxidant, a dye, a release agent, a light-diffusing agent, a flame retardant, a UV absorber, a silicone-based compound, an epoxy compound, and a polyether compound, wherein the polycarbonate-polyorganosiloxane copolymer (A) contains a polycarbonate block (A-1) and a polyorganosiloxane block (A-2), and satisfies the following requirements (1) to (3): (1) the content of the polyorganosiloxane block (A-2) is from more than 40 mass % to 70 mass % or less; (2) the copolymer has a viscosity-average molecular weight of from 10,000 to 23,000; and (3) the copolymer contains a specific polycarbonate block as the polycarbonate block (A-1).

Provided is a resin composition for electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher, having low loss tangent, and, an electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher. The resin composition for electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher contains a polycarbonate resin, and the polycarbonate resin having a mass ratio of a structural unit represented by formula (1) and a carbonate unit other than the structural unit represented by formula (1) of (33 to 100):(67 to 0), in formula (1), each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or a methyl group, and W.sup.1 represents a single bond or a divalent group.

##STR00001##

Provided is a resin composition for electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher, having low loss tangent, and, an electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher. The resin composition for electronic/electric equipment component used with an electromagnetic wave at a frequency of 1 GHz or higher contains a polycarbonate resin, and the polycarbonate resin having a mass ratio of a structural unit represented by formula (1) and a carbonate unit other than the structural unit represented by formula (1) of (33 to 100):(67 to 0), in formula (1), each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or a methyl group, and W.sup.1 represents a single bond or a divalent group.

##STR00001##

A polymer composition includes a conductive polymer and at least one stretchability and electrical conductivity (STEC) enhancer, wherein a content of the STEC enhancer in the composition is at least about 1 wt. % of the composition.

A polymer composition includes a conductive polymer and at least one stretchability and electrical conductivity (STEC) enhancer, wherein a content of the STEC enhancer in the composition is at least about 1 wt. % of the composition.

A polymer composition includes a conductive polymer and at least one stretchability and electrical conductivity (STEC) enhancer, wherein a content of the STEC enhancer in the composition is at least about 1 wt. % of the composition.

There are disclosed aqueous pigment dispersions containing dispersant-improving-agents, and methods of preparing and using the same.