Abstract: A method for producing a polymer nanocomposite, includes: after expanding an interlayer space of a layered inorganic compound using an organic onium salt, immobilizing a radical polymerization initiator having a group represented by formula (1) on an interlayer surface of the layered inorganic compound via a covalent bond; and carrying out surface-initiated radical polymerization in a monomer from the immobilized radical polymerization initiator. Preferably, in the radical polymerization initiator having the group represented by the general formula (1), at least one of X1 to X3 in the formula is a chlorine atom, or R1 in the formula is a C1-25 alkylene group or a C2-25 alkenylene group optionally interrupted by an oxygen atom or an ester group and optionally substituted by a phenyl group: R1 represents a C1-25 alkylene group, a C2-25 alkenylene group, a C5-8 cycloalkylene group, or a C6-12 arylene group.

Abstract: The present invention provides a method of producing 2,4,6-tris(hydroxyphenyl)-1,3,5-triazine compound in which no rapid solidification or the like occurs and generation of by-products is suppressed, thereby enabling to reduce decrease in the yield. Particularly, the present invention is a method of producing 2,4,6-tris(hydroxyphenyl)-1,3,5-triazine compound represented by the following Formula (1): wherein the reaction between cyanuric halide compound represented by the following Formula (2): and hydroxyphenyl compound represented by the following Formula (3): is carried out by using, as the reaction solvent, a solvent containing sulfolane as the main component in the presence of a Lewis acid at an amount of 0.3 to 0.

Abstract: Disclosed is an optical film or optical sheet which is used for a polarizing plate using iodine as a dye or a liquid crystal display device using the polarizing plate. The optical film or optical sheet is made from a resin containing a triazine compound represented by general formula (1). [In the formula, R1 represents a linear or branched alkyl group having 1-12 carbon atoms, a cycloalkyl group having 3-8 carbon atoms, an alkenyl group having 3-8 carbon atoms, an aryl group having 6-18 carbon atoms, an alkylaryl group having 7-18 carbon atoms, or an arylalkyl group having 7-18 carbon atoms; and R2 represents an alkyl group having 1-8 carbon atoms or an alkenyl group having 3-8 carbon atoms.

Abstract: The present invention provides piperazine pyrophosphate represented by chemical formula (I) which has a sodium content of 10 ppm or lower and a process of producing the same. The piperazine pyrophosphate has high purity and provides a flame retardant composition exhibiting excellent flame retardancy. The process includes dehydration condensation of piperazine diphosphate and is able to produce the piperazine pyrophosphate at low cost.

Abstract: The present invention provides piperazine pyrophosphate represented by chemical formula (I) which has a sodium content of 10 ppm or lower and a process of producing the same. The piperazine pyrophosphate has high purity and provides a flame retardant composition exhibiting excellent flame retardancy. The process includes dehydration condensation of piperazine diphosphate and is able to produce the piperazine pyrophosphate at low cost.

Abstract: A flame-retardant resin composition is disclosed. The composition comprises (A) 100 parts by weight of a synthetic resin, (B) 0.5 to 30 parts by weight of a phosphoric ester flame retardant, (C) 0.005 to 5 parts by weight of an organic phosphoric ester metal salt and (D) 0.05 to 5 parts by weight of an anti-dripping agent.

Abstract: The process for producing a low acid value phosphoric ester of the present invention is characterized by comprising treating a phosphoric ester having an acid value with an organic ortho-acid ester. The phosphoric ester preferably has a specific structure. The organic ortho-acid ester is preferably an ester of orthoformic acid, orthoacetic acid or orthopropionic acid with an alkyl group having 1 to 4 carbon atoms.