Hodogaya Chemical Co., Ltd.

Mitsubishi Steel Mfg. Co., Ltd.

Mitsubishi Seiko Kabushiki Kaisha

Yoshihiko Abe

Sueo Kanno

Jun Watanabe

Atsushi Takesue

Hideyuki Otsuka

Kanae Hiraishi

Toshitaka Kaneshiki

Tadayoshi Haneda

Satoshi Maeda

Makoto Suzuki

Yuichi Hane

Toshiyuki Endo

Kanae Otsuka

Shunsuke Saitoh

Isao Okabe

Atsushi Shirota

Ryoji Hattori

A process for producing a charge control agent comprising an azo-based iron complex salt compound as an effective component, comprises: The ironization reaction of the monoazo compound is carried out while pH is kept at 7.0 to 8.0. Since the above azo-based iron complex salt compound having high purity can be obtained at a high yield, it can be used as a charge control agent directly and a special purification step can be eliminated, thereby making it possible to greatly cut the production cost.

Process for producing a charge control agent

A method for selectively separating 2,6-dichlorotoluene from a mixture of dichlorotoluene isomers by means of a zeolite adsorber, characterized in that a zeolite selected from the group consisting of ZSM-5 zeolite, ZSM-8 zeolite, ZSM-11 zeolite, ZSM-21 zeolite, ZSM-35 zeolite, Zeta-1 zeolite, Zeta-3 zeolite and TPZ-3 zeolite, is used as the adsorber to selectively separate 2,6-dichlorotoluene as a non-adsorbed component.

Method for adsorptive separation of dichlorotoluenes

Para-chlorotoluene is prepared selectively at high yield by nuclear chlorination of toluene, in the presence of a Lewis acid catalyst, and a co-catalyst comprising at least one compound selected from the group consisting of phenoxthine derivatives and highly chlorinated phenoxthine derivatives obtained by chlorinating said phenoxthine derivatives at higher degree, said phenoxthine derivatives being represented by the general formula of: ##STR1## wherein R represents methyl group or groups at the position-1 and/or position-3,

Process for the nuclear chlorination of toluene

As a material for bit legs, cutters, bearings and ring seals in a bit for drilling igneous rock steel is used which consists essentially in weight % of:

Materials for a bit

Hardened machined parts are manufactured from rolled or forged steel which consists essentially of 0.05 to 0.15 wt % of C, up to 0.50 wt % of Si, up to 1.5 wt % of Mn, 0.30 to 1.0 wt % of Cr, 0.50 to 1.0 wt % of Mo, one or more of elements selected from the group consisting of 0.10 to 0.40 wt % of V, 0.03 to 0.20 wt % of Ti, 0.03 to 0.20 wt % of Nb and 0.0005 to 0.0050 wt % of B, the balance being Fe, in the following steps: cooling the steel in air from 900.degree. C to 1,000.degree. C; machining the cooled steel; and subjecting the machined steel to a nitriding treatment at 500.degree. to 650.degree. C for 2 to 8 hours.

Method for manufacturing hardened machined parts

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Tokyo, Japan

Yoshihiko Abe