(US20160229974) 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.
(JP2017071802) PROBLEM TO BE SOLVED: To provide a method for producing an extruded foamed polystyrene resin sheet having flame resistance and heat insulating property usable for housing material applications and excellent heat resistance and also excellent recyclability.SOLUTION: In a method of producing an extruded foamed polystyrene resin sheet, a composite flame retardant composed of 2,2-bis[4-(dibromo-2-methylpropoxy)-3,5-dibromophenyl]propane (A), 2,2-bis[4-(dibromopropoxy)-3,5-dibromophenyl]propane (B) and brominated isocyanurate (C) is used, a blended ratio of the component (A) in the composite flame retardant is in a specific range, a blending ratio (weight ratio) of the component (B) and the component (C) is in a specific range, a specific amount of the composite flame retardant is blended with 100 pts.wt. of the polystyrene resin, and a specific amount of the brominated isocyanurate (C) is blended with 100 pts.wt. of the polystyrene resin.SELECTED DRAWING: None
(JP5885792) PROBLEM TO BE SOLVED: To provide foamable polystyrene resin particles which are small in foaming variation during preliminary foaming, allow the prolongation of storable period, and can provide a good foam-molded article even if they are stored for a long period of time.SOLUTION: The foamable polystyrene resin particles are obtained by incorporating a foaming agent into polystyrene resin particles produced through a melt-kneading process, and have a stuck water content in the range of 0.05-0.45 mass% and include a metal oxide within the range of 0.1-10.0 mass%.
(JP2017048343) PROBLEM TO BE SOLVED: To provide a foam polystyrene resin molded part excellent in foamability, mechanical strength, hardness, antistatic properties, heat resistance and fire retardancy and free from the generation of squeak noise, and a method for producing the same.SOLUTION: Provided is foam polystyrene resin grains having rubber and sodium silicate and/or silicone on the surfaces, and also provided is a foam polystyrene resin molded part. Also provided is a method for producing foam polystyrene resin grains where rubbery latex is mixed with sodium silicate and/or silicone to prepare a rubby latex mixture, and foam polystyrene resin grains are coated with the rubby latex mixture. Also provided is a method for producing a foam polystyrene resin molded part where polystyrene resin grains are pre-foamed to foam polystyrene resin grains, hot molding is performed to form a foam polystyrene resin molded part, sodium silicate and/or silicone is mixed to rubby latex to prepare a rubby latex mixture, and the foam polystyrene resin molded part is coated with the rubby latex mixture.SELECTED DRAWING: None
(KR101372295) The present invention provides a light diffusing plate in a monolayer structure using a light diffusing polystyrene resin composition containing a polystyrene resin, a light diffusing agent, a fluorescent whitening agent, and a UV absorbing agent. The light diffusing plate in the monolayer structure of the present invention reduces expenses due to expensive resins in existing methods, reduces the production cost by simplifying production processes, and secures optical matter properties to be applied to a lighting protection cover, a sign, and direct type BLU including LCD or LED TVs. [Reference numerals] (AA) Polystyrene resin + Light diffusing agent + Fluorescent whitening agent + UV absorbing agent
(JP2015155489) PROBLEM TO BE SOLVED: To provide a polystyrene resin foam containing a brominated butadiene polymer as a flame retardant, having a high level of flame retardancy and a sufficient oxygen index. SOLUTION: Provided is a polystyrene resin foam containing a flame retardant. The flame retardant includes a brominated butadiene polymer and tetrabromobisphenol A-bis(2,3-dibromopropyl ether). The foam further contains a polyalkylbenzene as a flame-retarding auxiliary. COPYRIGHT: (C)2015,JPO&INPIT
(US8946365) A low z-average molecular weight, high softening point polystyrene resin having a narrow molecular weight distribution, as well as methods of making and using the same, are provided. The use of an inert solvent and/or the order of addition of reactants during polymerization may contribute to the unique properties of the final homopolymeric resin. The polystyrene resin can be partially or fully hydrogenated and may have particular use as a tackifying agent in a variety of hot melt adhesive and rubber compositions.
(JP2016191027) PROBLEM TO BE SOLVED: To provide a polystyrene resin foam plate more excellent in fusibility and processability.SOLUTION: In a polystyrene resin foam plate 1, the ratio (E/E) of a tensile elastic modulus (E) at 100°C to a tensile elastic modulus (E) at 23°C is 0.15-0.3, and the thickness is 3-10 mm. In the polystyrene resin foam plate 1, preferably, an extrapolation glass transition initiation temperature (T) measured based on JIS K7121 is 90°C or higher and below 100°C, and an extrapolation glass transition finishing temperature (T) is 100°C or higher and below 120°C.SELECTED DRAWING: Figure 1
(JP2016056271) PROBLEM TO BE SOLVED: To provide a novel foam polystyrene resin molding that is excellent in foaming properties, mechanical strength, hardness, antistatic properties, heat resistance, and flame retardancy and causes no squeak noise, and a method for producing the same.MEANS OF SELECTION: A foam polystyrene resin particle has, on its surface, rubber and melamine cyanurate.SELECTED DRAWING: None