Abstract: There is provided a heat ray absorbing lamp cover that exhibits excellent transparency and antifogging property to light sources that causes less temperature rise of a cover due to lamp irradiation, such as an LED light source and a semiconductor laser. The heat ray absorbing lamp cover has an average visible light transmittance of 75% or more, an average near-infrared light transmittance of 75% or less, and a haze of 3.0% or less.

Abstract: There is provided a heat ray absorbing lamp cover that exhibits excellent transparency and antifogging property to light sources that causes less temperature rise of a cover due to lamp irradiation, such as an LED light source and a semiconductor laser. The heat ray absorbing lamp cover has an average visible light transmittance of 75% or more, an average near-infrared light transmittance of 75% or less, and a haze of 3.0% or less.

Abstract: A method for producing a methacrylic polymer composition, which comprises a first polymerization step wherein a raw material composition A comprising a raw material monomer A containing no less than 50% by weight of methyl methacrylate, a polymerization initiator A, and a chain transfer agent A is supplied into a first complete mixing type reactor through a supply port of the reactor; and a second polymerization step wherein a raw material composition B comprising a raw material monomer B containing no less than 50% by weight of methyl methacrylate, a polymerization initiator B, and a chain transfer agent B, and the intermediate composition withdrawn in the first polymerization step are supplied into a second complete mixing type reactor through a supply port of the reactor.

Abstract: Provided is a methacrylic resin composition which comprises a copolymer produced by polymerizing monomer components including methyl methacrylate and an acrylic acid ester, wherein the contents of methyl methacrylate and the acrylic acid ester are 95.5% by weight or more and 4.5% by weight or less, respectively. A solution of the methacrylic resin composition in chloroform having a concentration of 0.5 g/50 ml has a reduced viscosity of 40 to 50 ml/g at 25° C., and the triad syndiotacticity in a methyl methacrylate unit chain is 47 to 51%. The resin composition is useful for injection molding.

Abstract: A method for producing a methacrylic polymer composition, which comprises a first polymerization step wherein a raw material composition A comprising a raw material monomer A containing no less than 50% by weight of methyl methacrylate, a polymerization initiator A, and a chain transfer agent A is supplied into a first complete mixing type reactor through a supply port of the reactor, and the raw material composition A is subjected to a continuous bulk polymerization in the first complete mixing type reactor, and a resulting intermediate composition is withdrawn through an effluent port of the first complete mixing type reactor; and a second polymerization step wherein a raw material composition B comprising a raw material monomer B containing no less than 50% by weight of methyl methacrylate, a polymerization initiator B, and a chain transfer agent B, and the intermediate composition withdrawn in the first polymerization step are supplied into a second complete mixing type reactor through a supply port of

Abstract: The use of a methacrylic resin composition for hot plate welding, wherein the methacrylic resin composition contains a polymer obtained by polymerization of monomers consisting mainly of methyl methacrylate, and at least one additive selected from the group consisting of fatty acid amides, fatty acid alkyl esters, fatty acid glycerides and aliphatic alcohols.

Abstract: The use of a methacrylic resin composition for hot plate welding, wherein the methacrylic resin composition contains a polymer obtained by polymerization of monomers consisting mainly of methyl methacrylate, the polymer having a viscosity-average molecular weight of 150000-250000.

Abstract: The use of a methacrylic resin composition for hot plate welding, wherein the methacrylic resin composition contains a polymer obtained by bulk polymerization of monomers consisting mainly of methyl methacrylate.