Abstract: The present invention discloses a polycarbonate resin composition and molded article thereof with excellent flame resistance, no problem with clouding, and excellent haze properties and color tone values. The flame retardant polycarbonate resin composition wherein (B) a metal salt of an organic sulfonic acid and (C) a compound with inclusion capability are contained in (A) a polycarbonate resin, and a flame retardant for a polycarbonate resin comprising an inclusion compound in which (B) a metal salt of an organic sulfonic acid is enclosed by (C) a compound with inclusion capability.

Abstract: The present invention discloses a polycarbonate resin composition and molded article thereof with excellent flame resistance, no problem with clouding, and excellent haze properties and color tone values. The flame retardant polycarbonate resin composition wherein (B) a metal salt of an organic sulfonic acid and (C) a compound with inclusion capability are contained in (A) a polycarbonate resin, and a flame retardant for a polycarbonate resin comprising an inclusion compound in which (B) a metal salt of an organic sulfonic acid is enclosed by (C) a compound with inclusion capability.

Abstract: A polycarbonate copolymer which comprises 30 to 70 mol % of a structural unit comprising a bisphenyl fluorene structure and 70 to 30 mol % of a structural unit comprising tricyclo [5.2.1.02.6] decanedimethanol and causes little occurrence of a birefringence even when extrusion, injection molding or stretch processing is conducted and a process for producing the same.

Abstract: A polycarbonate copolymer which comprises 30 to 70 mol % of a structural unit comprising a bisphenyl fluorene structure and 70 to 30 mol % of a structural unit comprising tricyclo [5.2.1.02,6] decanedimethanol and causes little occurrence of birefringence even when extrusion, injection molding or stretch processing is conducted and a process for producing the same.

Abstract: A polycarbonate resin with a polystyrene-converted weight average molecular weight (Mw) of 20,000 to 200,000 obtained by forming a carbonate bond from a dihydroxy compound represented by the general formula (1), a dihydroxy compound represented by the general formula (2) and bis(hydroxyphenyl) methane and a carbonic acid diester or phosgene, having higher stiffness and better balance of mechanical properties than conventional aromatic polycarbonate resin to be derived from 2,2-bis(4-hydroxyphenyl)propane.

Abstract: A polycarbonate resin composition obtained by blending a polycarbonate resin (A) obtained by forming a carbonate bond from 95 to 5 mol % of a dihydroxy compound having a fluorene structure represented by the general formula (1) and 5 to 95 mol % of a dihydroxy compound having a dimethanol structure represented by the general formula (2) and a carbonic diester and a polycarbonate resin (B) obtained by forming a carbonate bond from bisphenol A and a carbonic acid diester or phosgene in a ratio of (100×(A)/((A)+(B))=1 to 99% by weight and a polarizing sheet used the same.

Abstract: A polycarbonate resin composition obtained by blending a polycarbonate resin (A) obtained by forming a carbonate bond from 95 to 5 mol % of a dihydroxy compound having a fluorene structure represented by the general formula (1) and 5 to 95 mol % of a dihydroxy compound having a dimethanol structure represented by the general formula (2) and a carbonic diester and a polycarbonate resin (B) obtained by forming a carbonate bond from bisphenol A and a carbonic acid diester or phosgene in a ratio of (100×(A)/((A)+(B))=1 to 99% by weight and a polarizing sheet used the same.

Abstract: A polycarbonate resin with a polystyrene-converted weight average molecular weight (Mw) of 20,000 to 200,000 obtained by forming a carbonate bond from a dihydroxy compound represented by the general formula (1), a dihydroxy compound represented by the general formula (2) and bis(hydroxyphenyl) methane and a carbonic acid diester or phosgene, having higher stiffness and better balance of mechanical properties than conventional aromatic polycarbonate resin to be derived from 2,2-bis(4-hydroxyphenyl)propane.

Abstract: A process for producing a polycarbonate resin which comprises performing melt polycondensation of pentacyclopentadecanedimethanol or pentacyclopentadecanedimethanol and diol with carbonic acid diester in the presence of a catalyst containing at least one compound selected from the group consisting of zinc compounds, tin compounds, lead compounds, zirconium compounds and hafnium compounds.

Abstract: A process for producing a polycarbonate resin which comprises performing melt polycondensation of pentacyclopentadecanedimethanol or pentacyclopentadecanedimethanol and diol with carbonic acid diester in the presence of a catalyst containing at least one compound selected from the group consisting of zinc compounds, tin compounds, lead compounds, zirconium compounds and hafnium compounds.

Abstract: An aromatic-aliphatic copolycarbonate and a process for producing the same which comprises polycondensation of an aromatic dihydroxy compound, such as 1,1-bis(4-hydroxyphenyl)cyclohexane, tricyclo(5.2.1.02,6)decanedimethanol, and a carbonic acid diester in a molten state under heating, wherein the carbonic acid diester has a chlorine content of 20 ppm or lower. The copolycarbonate has improved refractive index, balance of dispersion, and photoelastic constant while retaining high impact resistance, high heat resistance, and excellent hue.

Abstract: An aromatic-aliphatic copolycarbonate and a process for producing the same which comprises polycondensation of an aromatic dihydroxy compound, such as 1,1-bis(4-hydroxyphenyl)cyclohexane, tricyclo(5.2.1.02,6)decanedimethanol, and a carbonic acid diester in a molten state under heating, wherein the carbonic acid diester has a chlorine content of 20 ppm or lower. The copolycarbonate has improved refractive index, balance of dispersion, and photoelastic constant while retaining high impact resistance, high heat resistance, and excellent hue.

Abstract: Provided is a polycarbonate resin consisting essentially of structural units of the structure formula (1) and the structure formula (2), wherein a molar ratio of the structure formula (1)/the structure formula (2) is 70/30 to 5/95.

Abstract: A polycarbonate resin obtainable by reaction of pentacyclopentadecane dimethanol, at least one compound selected from the group consisting of tricyclo (5.2.1.02,6) decane dimethanol, cyclohexane-1,4-dimethanol, decalin-2,6-dimethanol and norbornane dimethanol and carbonic acid diester.

Abstract: An aromatic-aliphatic copolycarbonate and a process for producing the same which comprises polycondensation of an aromatic dihydroxy compound, such as 1,1-bis(4-hydroxyphenyl)cyclohexane, tricyclo(5.2.1.02,6)decanedimethanol, and a carbonic acid diester in a molten state under heating, wherein the carbonic acid diester has a chlorine content of 20 ppm or lower. The copolycarbonate has improved refractive index, balance of dispersion, and photoelastic constant while retaining high impact resistance, high heat resistance, and excellent hue.

Abstract: A polycarbonate resin obtainable by reaction of pentacyclopentadecanedimethanol with carbonic acid diester and a polycarbonate resin obtainable by reaction of pentacyclopentadecanedimethanol, an aromatic dihydroxy compound and carbonic acid diester having a low photoelastic constant and a good balance between refractive index and Abbe's number.

Abstract: Processes for producing an aromatic/aliphatic copolycarbonate which has excellent impact resistance, excellent heat resistance, a high Abbe's number, a low photoelastic coefficient, and an excellent color tone.

Abstract: A copolycarbonate resin containing a structural unit derived from bisphenol A and a structural unit derived from 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro?5,5!undecane or a composition comprising the copolycarbonate resin and an aromatic polycarbonate resin containing a structural unit derived from bisphenol A as a main structural unit is mixed with a release agent and/or an antioxidant as required and is injection-molded to obtain an optical molded article such as a plastic lens which is excellent in impact resistance and hue and well balanced between refractive index and dispersion.

Abstract: A process for producing an aliphatic polyester carbonate which comprises reacting (1) an aliphatic dicarboxylic acid compound containing succinic acid as a main component, (2) an aliphatic dihydroxy compound containing 1,4-butanediol as a main component, and (3) (a) a polyhydric alcohol having 3 or more hydroxyl groups in a molecule, (b) a polybasic carboxylic acid compound having 3 or more carboxyl groups in a molecule, or (c) a polybasic carboxylic acid having one or more hydroxyl groups in a molecule to obtain an aliphatic polyester oligomer and reacting the obtained aliphatic polyester oligomer and a carbonate compound, wherein the aliphatic polyester carbonate has a melt tension of 1.5 g or more at 190.degree. C.

Abstract: Provided are an aliphatic polyester carbonate having biodegradability and having a content of carbonate unit of at least 5 mol %, a weight-average molecular weight of at least 100,000, a melt viscosity of 2,000-50,000 poises at 190.degree. C. and under a load of 60 kg and a melting point of 70.degree.-180.degree. C., and a process for producing said aliphatic polyester carbonate which comprises reacting an aliphatic dihydroxy compound with an aliphatic dibasic acid in the presence of an ester exchange catalyst to obtain an oligomer and then reacting the oligomer with a diaryl carbonate in the presence of the ester exchange catalyst. A phosphorus compound may be added to the aliphatic polyester carbonate for the purpose of stabilization.