A resin composition includes a modified poly(phenylene ether) compound having a carbon-carbon unsaturated double bond at a molecular end, a maleimide compound having two or more N-substituted maleimide groups in the molecule, and a styrene-based polymer having a weight-average molecular weight less than 10,000.

The present application relates to a retardation film including a composition or a cured product thereof, the composition comprising: an acrylate-based resin having a glass transition temperature (Tg) of 120° C.; or more; a retardation adjusting agent comprising a styrene monomer; and a triazine-based birefringence adjusting agent, in which the triazine-based birefringence adjusting agent is included in an amount of more than 5 parts by weight and 15 parts by weight or less, based on 100 parts by weight of the acrylate-based resin; a polarizing plate comprising the same, and a liquid crystal display device comprising the same.

Provided is a polymer composition having sufficient heat resistance and optical characteristics. Disclosed is a polymer composition comprising a polymer containing a monomer unit having a ring structure, wherein the polymer composition is, for instance, polymer composition A containing a polymer of a monomer having a ring structure, and when a flat plate of 120 mm×100 mm×3.0 mm in thickness is molded from the polymer composition under the following injection molding conditions of: (1) using a non-vent-type injection molding machine; (2) using a cold runner mold; (3) having a cylinder temperature of 260° C.; and (4) having a ratio of an injection volume of the injection molding machine to a molded product volume of 4.5, a difference between a monomer content in the flat plate obtained at a cooling time of 5 min and a monomer content in the flat plate obtained at a cooling time of 1 min is 1000 ppm by mass or more and 12000 ppm by mass or less.

Provided is a polymer composition having sufficient heat resistance and optical characteristics. Disclosed is a polymer composition comprising a polymer containing a monomer unit having a ring structure, wherein the polymer composition is, for instance, polymer composition A containing a polymer of a monomer having a ring structure, and when a flat plate of 120 mm×100 mm×3.0 mm in thickness is molded from the polymer composition under the following injection molding conditions of: (1) using a non-vent-type injection molding machine; (2) using a cold runner mold; (3) having a cylinder temperature of 260° C.; and (4) having a ratio of an injection volume of the injection molding machine to a molded product volume of 4.5, a difference between a monomer content in the flat plate obtained at a cooling time of 5 min and a monomer content in the flat plate obtained at a cooling time of 1 min is 1000 ppm by mass or more and 12000 ppm by mass or less.

Provided is a method for manufacturing a methacrylic resin composition having excellent surface processability and displaying excellent preservability of formed surface processing. A method for manufacturing a methacrylic resin composition, wherein the methacrylic resin composition comprises two or more types of methacrylic resins that each have a structural unit (X) having the same type of cyclic structure-containing main chain, the methacrylic resin composition has a Vicat softening temperature of 120° C. to 160° C., methanol-soluble content is contained in an amount of 5 mass % or less relative to 100 mass %, in total, of the methanol-soluble content and methanol-insoluble content, comprising mixing a low molecular weight component and a high molecular weight component.

Provided is a method for manufacturing a methacrylic resin composition having excellent surface processability and displaying excellent preservability of formed surface processing. A method for manufacturing a methacrylic resin composition, wherein the methacrylic resin composition comprises two or more types of methacrylic resins that each have a structural unit (X) having the same type of cyclic structure-containing main chain, the methacrylic resin composition has a Vicat softening temperature of 120° C. to 160° C., methanol-soluble content is contained in an amount of 5 mass % or less relative to 100 mass %, in total, of the methanol-soluble content and methanol-insoluble content, comprising mixing a low molecular weight component and a high molecular weight component.

An interdental cleaning tool (1) that includes a base (10) that has a shaft (20) shaped to be capable of being inserted between teeth, the base (10) being formed from a composite material that contains a synthetic resin, a reinforcement containing glass, and a copolymer having, as structural units, a polyolefin and an anhydride of an unsaturated carboxylic acid.

A polyamide resin composition contains a polyamide resin and an inorganic filler. 90 mass % or more of polyamide 66 is contained relative to 100 mass % of the polyamide resin. The inorganic filler content is ≥30 mass % relative to 100 mass % of the composition. The composition has a solidifying point of ≥210° C. The composition has a spiral flow value of ≥60 cm when the inorganic filler content is ≥30 mass % and <40 mass %, ≥40 cm when the content is ≥40 mass % and ≤50 mass %, and ≥20 cm when the content is >50 mass % and ≤70 mass %. The composition has a strain of ≤3.8% in a 1000-hour tensile creep test under 120° C. and 60 MPa. The composition has a formic acid relative viscosity (VR) of 30<VR<40.

A polyamide resin composition contains a polyamide resin and an inorganic filler. 90 mass % or more of polyamide 66 is contained relative to 100 mass % of the polyamide resin. The inorganic filler content is ≥30 mass % relative to 100 mass % of the composition. The composition has a solidifying point of ≥210° C. The composition has a spiral flow value of ≥60 cm when the inorganic filler content is ≥30 mass % and <40 mass %, ≥40 cm when the content is ≥40 mass % and ≤50 mass %, and ≥20 cm when the content is >50 mass % and ≤70 mass %. The composition has a strain of ≤3.8% in a 1000-hour tensile creep test under 120° C. and 60 MPa. The composition has a formic acid relative viscosity (VR) of 30<VR<40.

Provided is a thermoplastic resin composition excellent in heat resistance, transparency, appearance after shaping, and weather resistance, and in which coloring is suppressed during shaping processing. The thermoplastic resin composition of the present invention includes a copolymer (P1), and an antioxidant (O) represented by General Formula (1), in which the thermoplastic resin composition contains 80% by mass or more of the copolymer (P1) with respect to a total mass of the thermoplastic resin composition, and the copolymer (P1) includes 80 mol % or more of a repeating unit (A) derived from methyl (meth)acrylate (a), 2 mol % or more and 7 mol % or less of a repeating unit (B) derived from (meth)acrylic acid (b), and 0.001 mol % or more and 0.15 mol % or less of a repeating unit (C) having a glutaric anhydride structure. ##STR00001## [in Formula (1), R.sup.1 and R.sup.1′ each independently represent one or a plurality of alkyl groups having 1 to 8 carbon atoms substituted at an arbitrary position on a phenyl group]