Abstract: A compound which satisfies requirements for the annealing property and the lubricating property simultaneously and a process for producing the compound are provided. The compound is an alkylacetal compound represented by the following general formula (1) or (2). In the general formulae, R1 and R2 represent hydrocarbon groups, R3 to R8 represent hydrogen atom or hydrocarbon groups, i and j represent integers satisfying the relation that the sum of the integers is 8 to 98, and k represents 0 or 1.

Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Abstract: A compound which satisfies requirements for the annealing property and the lubricating property simultaneously and a process for producing the compound are provided. The compound is an alkylacetal compound represented by the following general formula (1) or (2). In the general formulae, R1 and R2 represent hydrocarbon groups, R3 to R8 represent hydrogen atom or hydrocarbon groups, i and j represent integers satisfying the relation that the sum of the integers is 8 to 98, and k represents 0 or 1.

Abstract: A compound which satisfies requirements for the annealing property and the lubricating property simultaneously and a process for producing the compound are provided. The compound is an alkylacetal compound represented by the following general formula (1) or (2). In the general formulae, R1 and R2 represent hydrocarbon groups, R3 to R8 represent hydrogen atom or hydrocarbon groups, i and j represent integers satisfying the relation that the sum of the integers is 8 to 98, and k represents 0 or 1.

Abstract: A compound which satisfies requirements for the annealing property and the lubricating property simultaneously and a process for producing the compound are provided. The compound is an alkylacetal compound represented by the following general formula (1) or (2). In the general formulae, R1 and R2 represent hydrocarbon groups, R3 to R8 represent hydrogen atom or hydrocarbon groups, i and j represent integers satisfying the relation that the sum of the integers is 8 to 98, and k represents 0 or 1.

Abstract: Processes for producing polycarbonate by solid phase polymerization which simplify the crytallization to be conducted prior to the solid phase polymerization to thereby permit further shortening in the treatment time. A process for producing polycarbonate is characterized in that an amorphous polycarbonate prepolymer prepared by transesterification of aromatic dihydroxy compound with a diester of carbonic acid is prepolymerized in a solid phase under an atmosphere containing gaseous swollen solvent while the prepolymer is kept in a fluid state. Another process for producing polycarbonate is characterized in that a mixture comprising an amorphous polycarbonate prepolymer prepared by transesterification of an aromatic dihydroxy compound with a diester of carbonic acid and a polycarbonate prepolymer which has undergone crystallization is prepolymerized in a solid phase under an atmosphere containing a gaseous swollen solvent.

Abstract: According to this invention, the prior art problem that relatively many steps and a long time are required for obtaining a high quality polycarbonate of a high molecular weight by a solid phase polymerization method has been solved by subjecting a polycarbonate oligomer to swollen solid phase polymerization under an atmosphere containing a swelling solvent gas or subjecting a polycarbonate oligomer to poor solvent solid phase polymerization under a stream of a poor solvent gas.

Abstract: Provided is a method for producing a granular polycarbonate prepolymer for solid-phase polymerization, comprising dissolving a polycarbonate prepolymer in a solvent under heat, then crystallizing it by cooling, and shaping it. The grains of the granular prepolymer hardly fuse together in polymerization, and the granular prepolymer is suitable for high-speed solid-phase polymerization to give polycarbonate.

Abstract: There are disclosed a process for producing a polycarbonate through transesterification which comprises using, as a polymerization catalyst, (1) a combination of a nitrogen-containing organic basic compound and a quaternary phosphonium salt, (2) a tetraarylphosphonium salt having a specific chemical structure, or (3) a quaternary phosphonium salt having a specific chemical structure and containing a branched alkyl group; and a process for producing a polycarbonate which comprises the steps of preparing a polycarbonate prepoplymer by preliminary polymerization and thereafter polymerizing the resultant prepolymer in a state of a solid phase by the use of a quaternary phosphonium salt as a catalyst.By using any of these processes it is made possible to produce, in extremely high efficiency, a high-quality polycarbonate being excellent in appearance, heat resistance, hydrolysis resistance and the like.

Abstract: The present invention relates to a process for inexpensively and effectively recovering a high-purity organic acid, according to which a crude organic acid is subjected to extraction treatment with an organic solvent to obtain an organic solvent extract containing an organic acid; the organic solvent extract is mixed with a high-pressure gas to precipitate and separate impurities thereby obtaining a solution containing a high-purity organic acid; and the organic acid is separated from the solution to obtain a high-purity organic acid.