A chloroprene rubber composition containing 100 parts by mass of a chloroprene-based rubber, 0.5 to 5.0 parts by mass of a sulfur-based compound represented by General Formula (1) below, and more than 0 parts by mass and 2.0 parts by mass or less of a xanthogen disulfide compound represented by General Formula (2) below.

##STR00001##

[In the formula, R.sup.1 represents a hydrogen atom, a hydroxyl group, or an alkyl group having 1 to 8 carbon atoms, and R.sup.2 and R.sup.3 each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.]

##STR00002##

[In the formula, R.sup.4 and R.sup.5 each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.]

A two-component adhesive includes agent A containing an epoxy resin and agent B containing a polymer having a crosslinkable silicon group and an epoxy resin curing agent, wherein agent A and/or agent B contain(s) a core-shell rubber particle, and a condensation catalyst for the crosslinkable silicon group. Another adhesive contains an epoxy resin, a core-shell rubber particle, a polymer having a crosslinkable silicon group, an epoxy resin curing agent, and a condensation catalyst for the crosslinkable silicon group, wherein a cured product of the adhesive has a breaking strength (tensile strength at rupture) of 5 MPa or more and an elongation at break (elongation at rupture) of 30% or more, and has storage elastic moduli at 1 Hz in tensile mode of 100 to 1000 MPa at 20° C. and 50 to 1000 MPa at 80° C.

A two-component adhesive includes agent A containing an epoxy resin and agent B containing a polymer having a crosslinkable silicon group and an epoxy resin curing agent, wherein agent A and/or agent B contain(s) a core-shell rubber particle, and a condensation catalyst for the crosslinkable silicon group. Another adhesive contains an epoxy resin, a core-shell rubber particle, a polymer having a crosslinkable silicon group, an epoxy resin curing agent, and a condensation catalyst for the crosslinkable silicon group, wherein a cured product of the adhesive has a breaking strength (tensile strength at rupture) of 5 MPa or more and an elongation at break (elongation at rupture) of 30% or more, and has storage elastic moduli at 1 Hz in tensile mode of 100 to 1000 MPa at 20° C. and 50 to 1000 MPa at 80° C.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

A power transmission belt includes a belt body at least portion of which is made of a rubber composition containing a rubber component, cellulose-based fine fibers, and cotton powder.

A power transmission belt includes a belt body at least portion of which is made of a rubber composition containing a rubber component, cellulose-based fine fibers, and cotton powder.

A rubber composition, by which a vulcanizate having excellent vulcanization speed, abrasion resistance and low temperature rise can be obtained, is provided. A rubber composition including 100 parts by mass of a chloroprene-based rubber, 20 to 80 parts by mass of silica, 1 part by mass or more and less than 20 parts by mass of a hydrate, and 0.3 to 1.4 parts by mass of an organic peroxide, wherein the rubber composition includes 0.5 to 15 parts by mass of a silane coupling agent having a double bond in a structure of the silane coupling agent with respect to 100 parts by mass of the silica.

A rubber composition, by which a vulcanizate having excellent vulcanization speed, abrasion resistance and low temperature rise can be obtained, is provided. A rubber composition including 100 parts by mass of a chloroprene-based rubber, 20 to 80 parts by mass of silica, 1 part by mass or more and less than 20 parts by mass of a hydrate, and 0.3 to 1.4 parts by mass of an organic peroxide, wherein the rubber composition includes 0.5 to 15 parts by mass of a silane coupling agent having a double bond in a structure of the silane coupling agent with respect to 100 parts by mass of the silica.

A rubber composition, by which a vulcanizate having excellent vulcanization speed, abrasion resistance and low temperature rise can be obtained, is provided. A rubber composition including 100 parts by mass of a chloroprene-based rubber, 20 to 80 parts by mass of silica, 1 part by mass or more and less than 20 parts by mass of a hydrate, and 0.3 to 1.4 parts by mass of an organic peroxide, wherein the rubber composition includes 0.5 to 15 parts by mass of a silane coupling agent having a double bond in a structure of the silane coupling agent with respect to 100 parts by mass of the silica.