Abstract: Disclosed is a polymerizable composition comprising Component (a): a polythiocarbonate polythiol, Component (b): an episulfide compound, and optionally Component (c): an organic compound having a functional group that is reactive to the episulfide compound. The polymerizable composition can be cured to provide a polythioether having excellent optical properties (a high refractive index and a high Abbe's number) as well as excellent mechanical properties (a high bending distortion and a high glass transition temperature) and thus exhibiting excellent properties as an optical material.

Abstract: Disclosed is a polythiocarbonate poly(thio)epoxide in which a hydrogen atom in a mercapto group of a polythiocarbonate polythiol is substituted with a (thio)epoxy-containing group. By using this compound as a starting material, there can be obtained a polythioether or a sulfur-containing polyether having, in addition to excellent optical properties (a high refractive index and a high Abbe's number), excellent mechanical properties (a high bending distortion) and a high glass transition temperature.

Abstract: Disclosed is a polythiourethane having a high refractive index and low dispersion which is obtained through a reaction between a polythiol component containing one or more polythiocarbonate polythiol (preferably one having a —(CO—S—R—S)— structure (wherein R represents a divalent hydrocarbon group) and a number average molecular weight of 200-2,500) and a polyisocyanate component containing a polyisocyanate and/or a polyisothiocyanate. This polythiourethane is useful for plastic lenses, prisms, optical fibers, substrates for information recording, colored filters, infrared absorbing filters and the like.

Abstract: Disclosed is a polythiocarbonate polythiol including repeating units represented by the chemical formula (I): in which formula (I), R represents a divalent hydrocarbon group, which hydrocarbon group may have at least one substituent which does not take part in a reaction with the polyisocyante component and the carbon chain in the hydrocarbon group may include at least one member selected from hetero atoms and an —OCO— group, and the polythiocarbonate polythiol has a number average molecular weight of 200 to 2500.

Abstract: Disclosed is a polythiourethane having a high refractive index and low dispersion which is obtained through a reaction between a polythiol component containing one or more polythiocarbonate polythiol (preferably one having a —(CO—S—R—S)— structure (wherein R represents a divalent hydrocarbon group) and a number average molecular weight of 200-2,500) and a polyisocyanate component containing a polyisocyanate and/or a polyisothiocyanate. This polythiourethane is useful for plastic lenses, prisms, optical fibers, substrates for information recording, colored filters, infrared absorbing filters and the like.

Abstract: A liquid polyethercarbonatediol compound, useful for producing a thermoplastic polyurethane having excellent weathering resistance, softness and stretchability, comprises a reaction product of (1) a carbonate-ester compound with (2) a polyetherdiol compound having, in the molecular structure thereof, structural units of -RO-(a) and structural units of —(CH2)—O-(b) and/or —CH2CH(CH3)—O-(c), in which reaction product, average molecular numbers n and m of the structural units (b) and (c), per mole of the structural units (a) satisfy the requirements: O?n?5, O?m?5 and 1<(n+m)?5.

Abstract: Disclosed is a polythiocarbonate polythiol including repeating units represented by the chemical formula (I): in which formula (I), R represents a divalent hydrocarbon group, which hydrocarbon group may have at least one substituent which does not take part in a reaction with the polyisocyante component and the carbon chain in the hydrocarbon group may include at least one member selected from hetero atoms and an —OCO— group, and the polythiocarbonate polythiol has a number average molecular weight of 200 to 2500.

Abstract: The present invention relates to a polyol mixture containing (1) 10 to 97% by weight of a crystalline polyester polyol produced by an aliphatic dicarboxylic acid and an aliphatic diol as main components, (2) 0 to 45% by weight of a polyester polyol produced by an aromatic polycarboxylic acid and an aliphatic polyol as main components, and (3) 3 to 45% by weight of a polycarbonate polyol, and a reactive hot melt composition obtained by reacting the polyol mixture and the polyisocyanate, and a molded product using the reactive hot melt composition.