A rubber composition contains a rubber component containing at least one selected from the group consisting of an isoprene rubber, a butadiene rubber, and a styrene-butadiene copolymer rubber, and a compound (1) represented by the following general formula (1). By using the rubber composition, it is possible to produce a rubber product having an excellent balance between a low strain hysteresis loss and a high strain hysteresis loss.

##STR00001##

[R.sup.1 and R.sup.2 in the general formula (1) each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 5 to 20 carbon atoms.]

A rubber composition contains a rubber component containing at least one selected from the group consisting of an isoprene rubber, a butadiene rubber, and a styrene-butadiene copolymer rubber, and a compound (1) represented by the following general formula (1). By using the rubber composition, it is possible to produce a rubber product having an excellent balance between a low strain hysteresis loss and a high strain hysteresis loss.

##STR00001##

[R.sup.1 and R.sup.2 in the general formula (1) each independently represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 5 to 20 carbon atoms.]

Described are hydrosilylation-curable polyorganosiloxane compositions containing sulfur, including hydrosilylation-curable polyorganosiloxane prepolymers and hydrosilylation-cured polyorganosiloxane polymer products made therefrom, as well as methods of preparing and using the same, devices comprising or prepared from the same, and sulfur-functional organosiloxanes useful therein.

A therapeutic or exercise putty includes a boronated silicone elastomer serving as the base ingredient and copper sulfate, zinc sulfate, copper oxide, zinc oxide or zinc pyrithione as a secondary ingredient mixed with the base putty or in combination with an antistatic ingredient. The inclusion of any one of the aforementioned secondary ingredients or the antistatic ingredient will reduce the risk of transmission of or infection from viruses, bacteria and microbial pathogens in or on the surface of the putty when the putty is used for hand rehabilitation or exercise by patients.

A therapeutic or exercise putty includes a boronated silicone elastomer serving as the base ingredient and copper sulfate, zinc sulfate, copper oxide, zinc oxide or zinc pyrithione as a secondary ingredient mixed with the base putty or in combination with an antistatic ingredient. The inclusion of any one of the aforementioned secondary ingredients or the antistatic ingredient will reduce the risk of transmission of or infection from viruses, bacteria and microbial pathogens in or on the surface of the putty when the putty is used for hand rehabilitation or exercise by patients.

Provided is a polycarbonate resin composition having excellent impact strength, molding residence stability, and dry heat resistance and that maintains high total light transmittance while suppressing light transmittance in a specific ultraviolet region, that is, harmful wavelengths near 420 nm. The polycarbonate resin composition of the present disclosure includes 0.1-1.5 mass part of an additive (B) per 100 mass parts of a polycarbonate resin (A) having a viscosity average molecular weight of 21,000-26,000 and includes 0.2 mass part or more of an ultraviolet absorber (B1) having a benzotriazole skeleton represented by formula 1 as the additive (B): In formula 1, R.sup.1-R.sup.5 each independently represent any of a hydrogen atom, a C1-20 hydrocarbon group, and a hydroxyl group, and the hydrocarbon group(s) may include an oxygen-containing group; R.sup.6-R.sup.9 each independently represent any of a hydrogen atom or a sulfur-containing group represented by R—S—, and at least one of R.sup.6-R.sup.9 is a sulfur-containing group represented by R—S—; and R is a C1-24 hydrocarbon group or a C6-24 aromatic group in which a hydrogen atom may be substituted by a C1-18 alkyl group.

Provided is a polycarbonate resin composition having excellent impact strength, molding residence stability, and dry heat resistance and that maintains high total light transmittance while suppressing light transmittance in a specific ultraviolet region, that is, harmful wavelengths near 420 nm. The polycarbonate resin composition of the present disclosure includes 0.1-1.5 mass part of an additive (B) per 100 mass parts of a polycarbonate resin (A) having a viscosity average molecular weight of 21,000-26,000 and includes 0.2 mass part or more of an ultraviolet absorber (B1) having a benzotriazole skeleton represented by formula 1 as the additive (B): In formula 1, R.sup.1-R.sup.5 each independently represent any of a hydrogen atom, a C1-20 hydrocarbon group, and a hydroxyl group, and the hydrocarbon group(s) may include an oxygen-containing group; R.sup.6-R.sup.9 each independently represent any of a hydrogen atom or a sulfur-containing group represented by R—S—, and at least one of R.sup.6-R.sup.9 is a sulfur-containing group represented by R—S—; and R is a C1-24 hydrocarbon group or a C6-24 aromatic group in which a hydrogen atom may be substituted by a C1-18 alkyl group.

Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a divalent metal-containing substituted-mercaptobenzimidazolate salt. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a divalent metal-containing substituted-mercaptobenzimidazolate salt. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

A cross-linkable nitrile rubber composition including a highly saturated nitrile rubber (A) containing α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, a master batch (B) containing an ethylene-vinyl acetate copolymer (b1) having a melt flow rate measured under a load of 21.18N at 190° C. of 0.5 to 1000 g/10 min. and containing vinyl acetate monomer units in a ratio of 5 to 50 wt % and an organic staple fiber (b2) having an average fiber length of 0.1 to 12 mm, and a cross-linking agent (C), wherein a ratio of the ethylene-vinyl acetate copolymer (b1) and the organic staple fiber (b2) in the master batch (B) is, in terms of a weight ratio of “ethylene-vinyl acetate copolymer (b1):organic staple fiber (b2)”, 30:70 to 80:20 is provided.