Abstract:
To provide a polycarbonate resin composition having a high Abbe's number, high strength and excellent stainability.Disclosed is a polycarbonate resin composition prepared by blending a polycarbonate resin (A) prepared by forming carbonate bonds in tricyclo[5.2.1.02,6]decanedimethanol with a diester or phosgene, and a weight-averaged molecular weight (Mw) of the polycarbonate resin (A) being equal to or more than 25,000, and a polycarbonate resin (B) prepared by reacting 2,2-bis(4-hydroxyphenyl)propane and phosgene, and weight-averaged molecular weight (Mw) of the polycarbonate resin (B) being equal to or more than 30,000, wherein a ratio thereof, 100×(A)/((A)+(B)), is from 1 to 99% by weight.
Abstract:
To provide a thermoplastic polymer composition excellent in molding.Disclosed is a thermoplastic polymer composition comprising A) a polycarbonate copolymer which is produced according to a melt method without adding any quencher, which comprises constitution units of (1) and (2), B) a mold release which is a partial ester formed of a C10-20 monovalent fatty acid and glycerol, and C) a hindered phenol antioxidant.
Abstract:
The present invention relates to a polycarbonate resin composition which comprises a polycarbonate resin having the repeating unit that is represented by the following general formula (1) and a hydroxyl group at terminal thereof and has the concentration of the terminal hydroxyl group of 1000 ppm or more.
Abstract:
Disclosed is an optical lens which can be produced by injection molding on an industrial scale and which has a high refractive index, a low Abbe's number, a low birefringence index, a high transparency and a high glass transition temperature. The optical lens can be produced by injection molding of a polycarbonate resin (preferably having a reduced viscosity of 0.2 dl/g or higher and a glass transition temperature of 120 to 160° C.), wherein the polycarbonate resin is produced by reacting a diol component comprising 99 to 51 mol % of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene and 1 to 49 mol % of bisphenol A with a carbonate diester. It becomes possible to produce an optical lens preferably having a refractive index of 1.60 to 1.65, an Abbe's number of 30 or smaller, a birefringence index of 300 nm or lower and an all light transmittance of 85.0% or higher.
Abstract:
Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.
Abstract:
The present invention provides a polycarbonate resin containing a structural unit represented by general formula (I). In formula (I), R's independently represent a halogen atom, an alkyl group having 1-9 carbon atoms, an aryl group having 6-12 carbon atoms, an alkenyl group having 2-5 carbon atoms, an alkoxy group having 1-5 carbon atoms, or an aralkyl group having 7-17 carbon atoms; n's independently mean the number of R's which substitute on the benzene ring and independently represent an integer of 0-4; Y represents an alkylene group having 1-4 carbon atoms; and p represents an integer of 0-4.
Abstract:
To provide a polycarbonate resin composition excellent in low-birefringence and environment resistance properties to be used for optical materials such as lenses, films or sheets.Disclosed is a polycarbonate resin composition comprising a polycarbonate resin (A) prepared by forming carbonate bonds in a dihydroxy compound represented by formula (1) with a diester carbonate, and a polycarbonate resin (B) prepared by forming carbonate bonds in 2,2-bis(4-hydroxyphenyl)propane with a diester carbonate or phosgene. In the formula, R1 and R2 each independently represent a hydrogen atom or methyl.
Abstract:
A tire (2) for a motorcycle includes a tread (4). The tread (4) has a center region (18), a pair of shoulder regions (20) and a pair of middle regions (22). In straight running, the center region (18) mainly comes in contact with a road surface. In cornering, the shoulder region (20) mainly comes in contact with a road surface. A modulus (Mm) of a rubber composition in the middle regions (22) is lower than a modulus (Mc) in the center region (18) and is higher than a modulus (Ms) in the shoulder regions (20). A ratio ((Mc−Mm)/(Mm−Ms)) is equal to or higher than 1/3 and is equal to or lower than 3/1. A ratio (Wm/W) is equal to or higher than 0.3 and is equal to or lower than 0.8. A ratio (Wc/W) is equal to or higher than 0.1 and is equal to or lower than 0.4. A ratio (Ws/W) is equal to or higher than 0.1 and is equal to or lower than 0.4.
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. The processes include those in which: an aromatic/aliphatic copolycarbonate having a nitrogen content of 9 ppm or lower is produced from an aliphatic dihydroxy compound having a nitrogen content of 10 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having an iron content of 1 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having a content of aldehyde groups and/or formyl groups of 100 ppm or lower; an aromatic/aliphatic copolycarbonate is produced by subjecting an aromatic dihydroxy compound and an aliphatic dihydroxy compound having a content of free chlorine of 5 ppm or lower to polycondensation with heating and melting; and an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound which has a melt Hazen unit of 40 or smaller after having been maintained at 260° C. for 5 hours in the air.
Abstract:
Process and apparatus for producing a photopolymer plate having relief images thereon. Successive portions of a continuous length of a protective film material are travelled in a horizontal elongated plane defined by a pair of parallel and spaced guide rollers. A layer of liquid photosensitive material is applied to a length of the horizontal web of the protective film material. A length of backing material is then laminated onto the upper surface of the layer to form an assembly. The assembly is moved by the protective film material into a relief exposure station for the exposure of the lower surface of the layer through an image-bearing transparency and the protective film material to an actinic radiation. The laminated portion of the backing material is separated from the remaining continuous web of the backing material. The image-bearing transparency is fed to the relief exposure station by a continuous length of another film material. After exposure, the protective film material is peeled off from the lower surface of the exposed layer, which is then delivered to a washing-out section wherein the unhardened non-exposed portions of the layer are washed out to form relief images on the backing material. Major components of the apparatus are plurality of rollers for driving and/or guiding the protective film material, backing material and transparency-conveying film material. The apparatus is thus simplified in construction.