A method for manufacturing a nitrile butadiene rubber includes: subjecting a material composition containing water, butadiene, acrylonitrile, an emulsifying agent, an initiator, and a molecular weight regulator to an emulsion polymerization reaction, so as to form an emulsion; and adding a reactive antioxidant and a non-reactive antioxidant to the emulsion to form a mixture, followed by subjecting the mixture to a coagulation process, so as to form the nitrile butadiene rubber.

A polycarbonate resin composition comprising a polycarbonate resin and 0.001 to 1 parts by weight of an NR type (R represents an alkyl group) hindered amine-based optical stabilizer per 100 parts by weight of the polycarbonate resin, wherein the polycarbonate resin comprises 40 mol % or more of a recurring unit (A) represented by the following formula and satisfies the following formulas (i) to (v), and the resin composition has excellent heat resistance, a low water absorption coefficient and high transparency, and suppresses deterioration during long-term use: (i) a metal compound comprising a negative ion represented by the following formula (B) and a positive ion constituted by a metal is used as a polymerization catalyst in an amount of 110.sup.9 to 110.sup.5 molar equivalent relative to the total diol compounds used for polymerization; (ii) the specific viscosity measured with a methylene chloride solution at 20 C. is 0.23 to 0.60; (iii) the glass transition temperature is 100 C. to 160 C.; (iv) the saturated water absorption coefficient is 2.5% or less; and (v) the relationship between the glass transition temperature (Tg C.) and the saturated water absorption coefficient (Wa %) satisfies the following formula (I):

2.5TW value=Tg0.04Wa(I) wherein R.sup.1 is an alkylene group, a cycloalkylene group, or an arylalkylene group which has 1 to 22 carbon atoms and may be linear or branched.

##STR00001##

A polycarbonate resin composition comprising a polycarbonate resin and 0.001 to 1 parts by weight of an NR type (R represents an alkyl group) hindered amine-based optical stabilizer per 100 parts by weight of the polycarbonate resin, wherein the polycarbonate resin comprises 40 mol % or more of a recurring unit (A) represented by the following formula and satisfies the following formulas (i) to (v), and the resin composition has excellent heat resistance, a low water absorption coefficient and high transparency, and suppresses deterioration during long-term use: (i) a metal compound comprising a negative ion represented by the following formula (B) and a positive ion constituted by a metal is used as a polymerization catalyst in an amount of 110.sup.9 to 110.sup.5 molar equivalent relative to the total diol compounds used for polymerization; (ii) the specific viscosity measured with a methylene chloride solution at 20 C. is 0.23 to 0.60; (iii) the glass transition temperature is 100 C. to 160 C.; (iv) the saturated water absorption coefficient is 2.5% or less; and (v) the relationship between the glass transition temperature (Tg C.) and the saturated water absorption coefficient (Wa %) satisfies the following formula (I):

2.5TW value=Tg0.04Wa(I) wherein R.sup.1 is an alkylene group, a cycloalkylene group, or an arylalkylene group which has 1 to 22 carbon atoms and may be linear or branched.

##STR00001##

An embodiment of the present invention provides a moisture-absorbing material including, in the following order, a moisture-permeable polymer layer, a moisture-absorbing layer having a porous structure and including amorphous silica, a water-soluble resin, a moisture-absorbing agent, and at least one selected from plasticizers and resins having a glass transition temperature of 50 C. or lower, and a moisture-proof layer.

A power transmission belt having a conductive rubber mixture, which has a resistivity of less than 6.0 M, wherein the conductive composition includes a base rubber, 25 to 250 phr of non-conductive carbon black as a filler and up to 5 phr of graphene as a conductive filler. The incorporation of a combination of a non-conductive carbon black filler and graphene into the rubber mixture allows for the replacement of conductive carbon black, which is conventionally used to procure conductive properties to rubber, but which has the disadvantage that it is comparatively expensive, especially in the quantities needed to confer conductive properties to the rubber mixture.

A power transmission belt having a conductive rubber mixture, which has a resistivity of less than 6.0 M, wherein the conductive composition includes a base rubber, 25 to 250 phr of non-conductive carbon black as a filler and up to 5 phr of graphene as a conductive filler. The incorporation of a combination of a non-conductive carbon black filler and graphene into the rubber mixture allows for the replacement of conductive carbon black, which is conventionally used to procure conductive properties to rubber, but which has the disadvantage that it is comparatively expensive, especially in the quantities needed to confer conductive properties to the rubber mixture.

Provided are a plasticizer composition and a resin composition, and a preparation method thereof, wherein the present invention may provide a plasticizer, which may improve physical properties, such as plasticizing efficiency, migration, tensile strength, elongation rate, stress resistance, and light resistance, required for a sheet formulation when used as a plasticizer of a resin composition, by improving poor physical properties that have been ascribed to structural limitations, and a resin composition including the plasticizer.

Provided are a plasticizer composition and a resin composition, and a preparation method thereof, wherein the present invention may provide a plasticizer, which may improve physical properties, such as plasticizing efficiency, migration, tensile strength, elongation rate, stress resistance, and light resistance, required for a sheet formulation when used as a plasticizer of a resin composition, by improving poor physical properties that have been ascribed to structural limitations, and a resin composition including the plasticizer.

Provided are a plasticizer composition and a resin composition, and a preparation method thereof, wherein the present invention may provide a plasticizer, which may improve physical properties, such as plasticizing efficiency, migration, tensile strength, elongation rate, stress resistance, and light resistance, required for a sheet formulation when used as a plasticizer of a resin composition, by improving poor physical properties that have been ascribed to structural limitations, and a resin composition including the plasticizer.

Provided are a plasticizer composition and a resin composition, and a preparation method thereof, wherein the present invention may provide a plasticizer, which may improve physical properties, such as plasticizing efficiency, migration, tensile strength, elongation rate, stress resistance, and light resistance, required for a sheet formulation when used as a plasticizer of a resin composition, by improving poor physical properties that have been ascribed to structural limitations, and a resin composition including the plasticizer.