Mitsubishi Chemical Corporation

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Engineering-plastics Corporation

Kenji Tsuruhara

Masaaki Miyamoto

Yoshihito Asao

Kyoko Higashino

Ryuuji Uchimura

Kazuyuki Takahashi

Tomonari Yokoyama

Atsushi Oohashi

Masanori Yamamoto

Tatsuya Hitomi

Michio Nakata

Ryouhei Nishihara

Tetsurou Nobuyasu

Katsumi Adachi

Takayuki Yoshida

Masashi Yokogi

Shin-ichi Sato

Tadashi Nishimura

Hiroki Shibata

Kei Uchiyama

Rie Konishi

Kazuo Hirowatari

Sora Tomita

Shinichi Sato

Yoshiaki Ohtani

Yuichi Yayama

Yukie Nakashima

A bisphenol composition including 95% or more by mass of a bisphenol, wherein a bisphenol represented by the following general formula (II) in the bisphenol composition constitutes 150 mass ppm or more, and the bisphenol composition has a methanol dissolution color (Hazen color number) of 2 or less, In formula (II), X denotes a single bond, —CRR—, —O—, —CO—, —S—, —SO—, or —SO—, Rand Rindependently denote a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and Rand Rmay be bonded to each other to form a ring. A method for producing a polycarbonate resin using the bisphenol composition is also described.

Bisphenol composition and polycarbonate resin

To provide a polycarbonate resin composition excellent in surface hardness and impact strength. A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the requirements:

Polycarbonate resin composition, method for producing same and molded article of this resin composition

To provide a polycarbonate resin composition excellent in the surface hardness, the heat resistance, the moldability and the flame retardancy. A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements:

To provide a polycarbonate resin composition having improved flame retardancy and moldability. A polycarbonate resin having a ratio of the melt viscosity &#x3b7;measured at 300&#xb0; C. at a shear rate of 10 secto the melt viscosity &#x3b7;measured at 300&#xb0; C. at a shear rate of 1000 sec(&#x3b7;/&#x3b7;) of at least 3 and at most 8, a branch parameter G=[&#x3b7;]/[&#x3b7;]lin of at least 0.80 and at most 0.94, and a pencil hardness of at least HB.

Polycarbonate resin, composition of said resin, and molded article of said resin

A rotor structure comprising magnets for suppressing the leakage of a magnetic flux between the side faces of the adjacent claw-like magnetic poles and metal holding members each of which covers the magnets together with the claw-like magnetic pole and radiates heat transmitted to the claw-like magnetic pole at the time of power generation. Therefore, the quantity of heat radiated to the peripheral portions of the magnets is increased and the coolability of the magnets can be greatly improved.

Rotor structure

A rotor has plural reinforcing bodies each approximately formed in a U-shape having wing portions arranged in both side portions of an attaching portion of a flat plate shape, and disposed such that the attaching portion faces to each of inner circumferential wall surfaces of claw-shaped magnetic poles and the wing portions are located on both sides of the claw-shaped magnetic poles in the circumferential direction; and plural magnets each fixedly attached to both wing portions of each of the reinforcing bodies and disposed on both sides of the claw-shaped magnetic poles in the circumferential direction, for reducing leaked magnetic flux between the claw-shaped magnetic poles adjacent to each other, wherein a multidegree of freedom vibrating system composed of the claw-shaped magnetic poles and the reinforcing bodies fixedly attaching the magnets thereto is constructed by attaching each of the reinforcing bodies in a state in which at least one portion of the attaching portion is fixedly attached to the inner circumferential wall surfaces of each of the claw-shaped magnetic poles.

Rotor for an alternator

Polycarbonate resin

Car AC generator

An alternating current generator has a cooling function for a vehicle and includes a front bracket and a rear bracket with annular recessed portions that form a peripheral cooling chamber. A cooling cover is provided on the rear bracket. The cooling cover and the rear bracket form a rear cooling chamber. The peripheral cooling chamber and the rear cooling chamber are connected together through a connecting hole provided in the rear bracket. The front and rear brackets also form a parts housing chamber for receiving electric parts. The parts housing chamber is isolated from the peripheral and rear cooling chambers so as not to accommodate the fluid.

Alternating current generator for vehicle

In order to simplify the structure of a cooling function section utilizing a cooling fluid, a front bracket and a bowl-shaped rear bracket having a flange portion projecting outward from its opening portion are joined in a format resembling hands closed in prayer to form a parts housing chamber, and an airtight cooling chamber utilizing the cooling fluid is formed between the rear bracket and the cooling cover by placing an opening portion of the cooling cover and the flange portion of the rear bracket one upon the other.

Liquid cooled brushless generator for vehicles

There is provided a polycarbonate resin with a reduced volatile chlorine content in which the amount of a chlorinous matter as volatilized from the resin when the resin is heated at 280.degree. C. for 30 minutes and then allowed to stand at room temperature for 3 days is 30 ppb or lower as calculated in terms of the amount of Cl atom. There is also provided a process for producing a polycarbonate resin using phosgene as a raw material, the improvement comprising using phosgene having a chlorine concentration of up to 1,000 ppb as the raw material thereby to provide the resin with a reduced volatile chlorine content.

Polycarbonate resin with a reduced volatile chlorine content and process

Disclosed are a method for producing a polyamide resin which comprises the steps of extracting with water a polyamide resin obtained by polymerizing caprolactam in the presence of water; condensing the extracted aqueous solution containing unreacted caprolactam and its low polymerized materials; and polymerizing the condensate by adding an additional amount of caprolactam, the improvement wherein (a) among the low polymerized materials of caprolactam, a cyclic dimer is supplied to a polymerization reactor after subjecting it to ring-opening reaction to give a chain structure material in an amount of 15% by weight or more based on the total amount of the cyclic dimer, or (a') a condensate obtained by condensing said aqueous solution until reaching a water partial pressure of 10 kg/cm.sup.2 G or more and a temperature of 230.degree. C. or higher is supplied to a polymerization reactor, and then (b) said additional amount of caprolactam is added to the polymerization reactor, and the procedures are repeatedly carried out.

Method for producing polyamide resin from caprolactam

A random copolymerized polyamide resin is prepared by reacting a lactam of the formula (I): ##STR1## wherein R.sup.1 is a C.sub.2-11 alkylene group optionally substituted with a substituent having 1 to 6 carbon atoms, with a hexamethylenediamine-adipic acid salt while concentrating the aqueous solution of the salt to a concentration of at least 70% by weight and while maintaining a uniform reaction phase at all times by controlling the pressure over and the temperature of the reaction medium such that the hexamethylenediamine-adipic acid salt does not precipitate, said pressure being up to not greater than 2 kg/cm.sup.2 .multidot.G and said temperature being up to not greater than 150.degree. C., and then mixing in the solution of the lactam of formula (I) thereby effecting copolymerization and forming a polyamide resin having a relative viscosity measured by the sulfuric acid solution method (1% at 25.degree. C.) of 1.5 to 8.0.

Growing community of inventors

Kitakyushu, Japan

Kenji Tsuruhara