Abstract: In foamable polystyrene resin particles that are obtained by granulating a polystyrene resin containing a flame retardant and a foaming agent, the flame retardant has a bromine atom in a molecule, contains less than 70% by mass of bromine, has a benzene ring in a molecule, and has a 5% by mass decomposition temperature in a range of from 200° C. to 300° C. the flame retardant is the sole source of bromine in the foamable polystyrene resin particles, a ratio (B:A) between (A) a by mass of the flame retardant contained in the total foamable polystyrene resin particles and (B) a % by mass of the flame retardant contained in the surface of the resin particles is in a range of from 0.8:1 to 1.2:1, and the amount of the flame retardant added is in a range of from 0.5% by mass to 5.0% by mass, based on 100 parts by mass of the resin fraction in the foamable polystyrene resin particles.

Abstract: Provided is a foamed acrylic-resin object, in which a heat-resistant temperature in thermomechanical analysis is 170° C. or higher, and the number of bubbles respectively having a major diameter of 2 mm or greater is 2.0 or less per area of 10 cm×10 cm.

Abstract: In foamable polystyrene resin particles that are obtained by granulating a polystyrene resin containing a flame retardant and a foaming agent, the flame retardant has a bromine atom in a molecule, contains less than 70% by mass of bromine, has a benzene ring in a molecule, and has a 5% by mass decomposition temperature in a range of from 200° C. to 300° C. the flame retardant is the sole source of bromine in the foamable polystyrene resin particles, a ratio (B:A) between (A) a by mass of the flame retardant contained in the total foamable polystyrene resin particles and (B) a % by mass of the flame retardant contained in the surface of the resin particles is in a range of from 0.8:1 to 1.2:1, and the amount of the flame retardant added is in a range of from 0.5% by mass to 5.0% by mass, based on 100 parts by mass of the resin fraction in the foamable polystyrene resin particles.

Abstract: In foamable polystyrene resin particles that are obtained by granulating a polystyrene resin containing a flame retardant and a foaming agent, the flame retardant has a bromine atom in a molecule, contains less than 70% by mass of bromine, has a benzene ring in a molecule, and has a 5% by mass decomposition temperature in a range of from 200° C. to 300° C., the flame retardant is the sole source of bromine in the foamable polystyrene resin particles, a ratio (B/A) between (A) a % by mass of the flame retardant contained in the total foamable polystyrene resin particles and (B) a % by mass of the flame retardant contained in the surface of the resin particles is in a range of from 0.8/1 to 1.2/1, and the amount of the flame retardant added is in a range of from 0.5% by mass to 5.0% by mass, based on 100 parts by mass of the resin fraction in the foamable polystyrene resin particles.

Abstract: There are provided expandable polystyrene resin particles formed by granulating a polystyrene resin containing an expanding agent, wherein the weight-average molecular weight Mw of the polystyrene resin is in the range of 120,000 to 270,000, and the expanding agent contains, as an essential component, pentane at a proportion of 3 to 8 parts by mass based on 100 parts by mass of the polystyrene resin, while the composition of the pentane is in the range of isopentane:normal pentane=10:90 to 80:20 by mass ratio. These expandable polystyrene resin particles can utilize a recycled raw material, and can produce a molded foam product having sufficient mechanical strength, while the expandable polystyrene resin particles have a long bead life and excellent low pressure moldability.

Abstract: In foamable polystyrene resin particles that are obtained by granulating a polystyrene resin containing a flame retardant and a foaming agent, the flame retardant has a bromine atom in a molecule, contains less than 70% by mass of bromine, has a benzene ring in a molecule, and has a 5% by mass decomposition temperature in a range of from 200° C. to 300° C., and a ratio (B/A) between (A) the amount of the flame retardant contained in the total foamable polystyrene resin particles and (B) the amount of the flame retardant contained in the surface of the resin particles is in a range of from 0.8 to 1.2. By pre-foaming the foamable polystyrene resin particles and then foaming the particles in a mold, a polystyrene resin foam-molded article having flame retardancy is obtained.

Abstract: There are provided expandable polystyrene resin particles formed by granulating a polystyrene resin containing an expanding agent, wherein the weight-average molecular weight Mw of the polystyrene resin is in the range of 120,000 to 270,000, and the expanding agent contains, as an essential component, pentane at a proportion of 3 to 8 parts by mass based on 100 parts by mass of the polystyrene resin, while the composition of the pentane is in the range of isopentane:normal pentane=10:90 to 80:20 by mass ratio. These expandable polystyrene resin particles can utilize a recycled raw material, and can produce a molded foam product having sufficient mechanical strength, while the expandable polystyrene resin particles have a long bead life and excellent low pressure moldability.

Abstract: The present invention provides a foamed sheet for a reflector which can be transformed to a reflector having a desired shape by thermoforming. A foamed sheet A for a reflector of the present invention is characterized by being a foamed sheet for a reflector including a polypropylene-based resin foamed sheet 1 which has an average cell diameter of from 50 to 650 ?m and at least one surface which is an uneven surface 12 formed by cells 11 located in the vicinity of the surface, and a polypropylene-based resin non-foamed sheet 3 integrally laminated on the polypropylene-based resin foamed sheet 1 in conformity with the uneven surface 12 and having an uneven surface 31, wherein the foamed sheet A for a reflector contains an inorganic filler in an amount of from 50 to 200 g/m2, the whole or part of the inorganic filler is contained in the polypropylene-based resin foamed sheet 1, a refractive index of an inorganic filler 2 differs by 1.