Mitsubishi Chemical Corporation

Nitto-denko Corporation

Other

Mitsubishi Engineering-plastics Corporation

Tomohiko Tanaka

Makoto Nakamura

Hiroshi Nakano

Nao Murakami

Michiaki Fuji

Takashi Shimizu

Minako Akita

Shingo Namiki

Masashi Yokogi

Haruo Sasaki

Toshiyuki Iida

Kazuki Uwada

Haruo Ohmura

Tadashi Kojima

Atsushi Kasai

Masato Ando

Asami Kakiuchi

Koichi Sagisaka

Etuji Asano

Sigeru Tanaka

Takao Kuno

Hisanori Mori

The present invention aims to provide a polycarbonate resin composition having impact resistance at high levels in good balance, a production method thereof, and a molded body of the polycarbonate resin composition. The present invention relates to a polycarbonate resin composition containing a polycarbonate resin (A) having a constitution unit derived from a compound represented by formula (1) and polyrotaxane (B), a production method thereof, and a molded body of the resin composition: 

Polycarbonate resin composition and molded body thereof

Disclosed herein is a process for producing a transparent film, including the step of stretching a film in at least one direction under a condition(s) that satisfies an expression (5):200%/min&#x2264;[stretching speed(strain rate)]&#x2264;1,200%/min&#x2003;&#x2003;(5),wherein the film comprises a polycarbonate resin containing at least a constitutional unit derived from a dihydroxy compound (A) that has a bonded structure represented by a structural formula (1): in which no hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).

Polycarbonate resin film, and transparent film and process for producing the same

The present invention aims at providing a polycarbonate resin composition having excellent transparency and possessing high levels of biogenic substance content rate, heat resistance, wet heat resistance and impact resistance in a balanced manner, a production method thereof, and a molded body of the polycarbonate resin composition. The present invention is a polycarbonate resin composition including a polycarbonate resin (A) containing a constitutional unit derived from a compound represented by the following formula (1), and an aromatic polycarbonate resin (B), a production method thereof, and a molded body of the resin composition: 

Polycarbonate resin composition, method for producing same, and molded object

A polycarbonate resin film of the present invention is formed from a polycarbonate resin which contains at least a constitutional unit derived from a dihydroxy compound having a bonded structure represented by the following structural formula (1) and satisfies the following expression (2) when subjected to a tensile test at a standard stretching temperature for the polycarbonate resin and at a pulling speed (strain rate) of 1,000%/min.[Chem. 1]CH&#x2014;O&#x2003;&#x2003;(1)(No hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).)0.9&#x2266;[(lower yield stress in tension)/(upper yield stress in tension)]&#x2266;1&#x2003;&#x2003;(2).

The present invention provides a retardation film web having sufficient reversed wavelength dispersion characteristics and favorable for film lamination according to a roll-to-roll system. A retardation film web of the present invention includes a polycarbonate resin or a polyester carbonate resin, an orientation angle &#x3b8; which is an angle between a slow axis and a width direction satisfies the following formula (I), and a ratio of an in-plane retardation R450 measured at a wavelength of 450 nm to an in-plane retardation R550 measured at a wavelength of 550 nm satisfies the following formula (II):38&#xb0;&#x2266;&#x3b8;&#x2266;52&#xb0;&#x2003;&#x2003;(I)R450/R550&#x3c;1&#x2003;&#x2003;(II).

Retardation film web, circularly polarizing plate and organic EL panel

The problem to be solved by the present invention is to provide a polycarbonate copolymer containing a plant-derived raw material, which is excellent in the mechanical strength and heat-resistant and assured of small refractive index, large Abbe number, small birefringence and excellent transparency. The present invention provides a polycarbonate copolymer containing a constitutional unit derived from a dihydroxy compound represented by the following formula (1) and a constitutional unit derived from an alicyclic dihydroxy compound, wherein the Abbe number is 50 or more and the 5% thermal reduction temperature is 340&#xb0; C. or more; and a method of producing this polycarbonate copolymer by reacting a dihydroxy compound represented by the following formula (1) and an alicyclic hydroxy compound with a carbonic acid diester in the presence of a polymerization catalyst. 

Polycarbonate copolymer and method of producing the same

The polycarbonate resin of the present invention comprises a structural unit derived from a dihydroxy compound represented by a specific formula (1), a structural unit derived from a dihydroxy compound represented by a specific formula (2), and a structural unit derived from a dihydroxy compound represented by any one of specific formulae (3) to (6), wherein the content of structural units derived from dihydroxy compounds represented by the specific formulae (3) to (6) is within a specific range based on the total of structural units derived from dihydroxy compounds in the polycarbonate resin.

Polycarbonate resin and transparent film comprising the same

The present invention relates to a polycarbonate resin composition, comprising: a polycarbonate resin containing a structural unit derived from a dihydroxy compound having a moiety represented by the following formula (1) [provided that a case where the moiety represented by formula (1) is a moiety constituting &#x2014;CH&#x2014;O&#x2014;H is excluded]; and an elastomer composed of a core&#x2022;shell structure, wherein a core layer of the elastomer is at least one member selected from the group consisting of an alkyl (meth)acrylate and a (meth)acrylic acid, and a polycarbonate resin molded article obtained by molding the polycarbonate resin composition:CH&#x2014;O&#x2003;&#x2003;(1).

Polycarbonate resin composition and molded article thereof

The present invention relates to a polycarbonate resin composition, comprising: a polycarbonate resin containing a structural unit derived from a dihydroxy compound having a moiety represented by the following formula (1) [provided that a case where the moiety represented by formula (1) is a moiety constituting &#x2014;CH&#x2014;O&#x2014;H is excluded]; and an elastomer composed of a core&#x25cf;shell structure, wherein a core layer of the elastomer is composed of a butadiene-styrene copolymer, and a polycarbonate resin molded article obtained by molding the polycarbonate resin composition:CH&#x2014;O&#x2003;&#x2003;(1).

The polycarbonate resin of the invention includes a first structural unit derived from a dihydroxy compound represented by a general formula (1), a second structural unit derived from a dihydroxy compound represented by a general formula (2), and a third structural unit derived from at least one dihydroxy compound selected from the group consisting of a dihydroxy compound represented by a general formula (3), a dihydroxy compound represented by a general formula (4), a dihydroxy compound represented by a general formula (5), and a dihydroxy compound represented by a general formula (6), and in which the first structural unit derived from a dihydroxy compound represented by the general formula (1) accounts for 18% by mole or more of the polycarbonate resin. The above general formulae (1) to (6) are described in the specification of the present application.

Polycarbonate resin and transparent film formed therefrom

A subject for the invention relates to processes for producing a polycarbonate containing a plant-derived starting material and to molded articles thereof, the polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, low birefringence, and excellent transparency. The invention relates to a process for producing a polycarbonate which includes a step in which one or more dihydroxy compounds including a dihydroxy compound having at least one linking group &#x2014;CH&#x2014;O&#x2014; in the molecule thereof are reacted with a carbonic acid diester in the presence of a polymerization catalyst, wherein the dihydroxy compound having at least one linking group &#x2014;CH&#x2014;O&#x2014; in the molecule thereof has a formic acid content lower than 20 ppm. The invention further relates to a molded article constituted of a polycarbonate or a composition of the polycarbonate, the polycarbonate being a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one linking group &#x2014;CH&#x2014;O&#x2014; in the molecule thereof and has an Abbe number of 50 or larger and a 5% weight loss temperature of 340&#xb0; C. or higher.

Processes for producing polycarbonate and molded polycarbonate articles

To provide a polyester resin particularly useful in application to optical films, etc. A polyester resin which is an alicyclic polyester comprising dicarboxylic acid units and diol units, characterized by the following (1) to (4):

Polyester resin, polyester resin composition, and sheet, film and hollow molded container obtained therefrom

Trays for carrying magnetic heads for magnetic disks are provided, such as magnetic-head carrying trays which are less apt to cause electrical damage due to electrostatic discharge, an excess flow of contact current, etc. or physicochemical damage such as particle detachment, contamination with ions, etc. The trays for carrying magnetic heads for magnetic disks are trays obtained by molding a conductive thermoplastic resin composition containing a conductive loading material, e.g., a conductive filler, and have a surface resistance of from 10 to 10 &OHgr;.

Tray for conveying magnetic head for magnetic disk

A thermoplastic resin composition comprising (a) a polyphenylene sulfide resin, (b) a polyphenylene ether resin, (c) a specific organophosphorus compound, and (d) a basic compound is disclosed. The composition exhibits improved compatibility between resinous components (a) and (b) and therefore provides a molded article having high mechanical strength and excellent appearance.

Growing community of inventors

Fukuoka, Japan

Tomohiko Tanaka