The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced.

The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced.

The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced.

A nanofiber for an air filter and a method for manufacturing the same are proposed. The nanofiber may include a styrene-(meth)acrylate-acrylonitrile random copolymer having a zwitterionic functional group in a side chain. The nanofiber can greatly enhance the bonding of particulate matter (PM) particles with the surface of a polymer by having a high dipole moment derived from the zwitterionic functional group, thereby providing high efficiency of filtration (>99.9%) of the PM particles. Furthermore, the nanofiber can be very usefully used as a core material for air purifier filters and vehicle air purification filters by having low airflow resistance and excellent antibacterial properties.

A nanofiber for an air filter and a method for manufacturing the same are proposed. The nanofiber may include a styrene-(meth)acrylate-acrylonitrile random copolymer having a zwitterionic functional group in a side chain. The nanofiber can greatly enhance the bonding of particulate matter (PM) particles with the surface of a polymer by having a high dipole moment derived from the zwitterionic functional group, thereby providing high efficiency of filtration (>99.9%) of the PM particles. Furthermore, the nanofiber can be very usefully used as a core material for air purifier filters and vehicle air purification filters by having low airflow resistance and excellent antibacterial properties.

A thermoplastic resin composition includes 7% to 64% by mass of rubber-containing graft copolymer (A), 2% to 35% by mass of thermoplastic elastomer (B), 0.5% to 90% by mass of polycarbonate-based resins (C), and 0.5% to 20% by mass of inorganic compound (D) having volume average particle diameter (MV) of 1 to 200 μm (where a total of (A), (B), (C), and (D) (hereafter referred to as “total of a component (A) to a component (D)”) is 100% by mass). The rubber-containing graft copolymer (A) is a graft copolymer in which 35 to 80 parts by mass of rubber-like polymer selected from diene-based rubber, acrylic rubber, and ethylene-based rubber is graft-polymerized with 20 to 65 parts by mass of vinyl-based monomer mixture containing an aromatic-vinyl-based monomer and a vinyl-cyanide-based monomer (where a total of the rubber-like polymer and the vinyl-based monomer mixture is 100% by mass).

Processes for producing filled polyol compositions, such as polymer polyol compositions. The processes include reacting a polymerizable composition in the presence of a composition comprising a base polyol and an amine antioxidant, in which the amine antioxidant comprises a secondary diarylamine, a primary aromatic amide, a triazole, or a combination thereof.

Processes for producing filled polyol compositions, such as polymer polyol compositions. The processes include reacting a polymerizable composition in the presence of a composition comprising a base polyol and an amine antioxidant, in which the amine antioxidant comprises a secondary diarylamine, a primary aromatic amide, a triazole, or a combination thereof.

A toner comprising a toner particle comprising a binder resin, wherein the binder resin comprises a resin A and a resin B, in a differential scanning calorimetric measurement, a peak top temperature of the largest endothermic peak is present within a specific temperature range and an endothermic amount of an endothermic peak derived from the resin A is 30 to 70 J/g per 1 g of the toner, a ratio of content of the resin A in the toner particle is 60.0 to 90.0 mass %, the resin A comprises 40.0 to 70.0 mass % of a monomer unit (a) represented by formula (1) below, and the resin B comprises 5.0 to 30.0 mass % of a monomer unit (b) represented by formula (2) below:

##STR00001## in formulae (1) and (2), R.sup.1 and R.sup.2 denote a hydrogen atom or a methyl group, n and m denote a specific integer.

A toner comprising a toner particle comprising a binder resin, wherein the binder resin comprises a resin A and a resin B, in a differential scanning calorimetric measurement, a peak top temperature of the largest endothermic peak is present within a specific temperature range and an endothermic amount of an endothermic peak derived from the resin A is 30 to 70 J/g per 1 g of the toner, a ratio of content of the resin A in the toner particle is 60.0 to 90.0 mass %, the resin A comprises 40.0 to 70.0 mass % of a monomer unit (a) represented by formula (1) below, and the resin B comprises 5.0 to 30.0 mass % of a monomer unit (b) represented by formula (2) below:

##STR00001## in formulae (1) and (2), R.sup.1 and R.sup.2 denote a hydrogen atom or a methyl group, n and m denote a specific integer.