Sumitomo Seika Chemicals Co., Ltd.

Kao Corporation

Makoto Katou

Toru Ido

Shinji Kobayashi

Nobutaka Fujimoto

Yukio Noda

Shigeki Hamamoto

Susumu Fujinami

Tomohisa Hirata

Takuaki Harada

Masaki Teramoto

Kazuyuki Miura

Kimie Sannomiya

Masahiro Gotou

Makiko Kawano

Yutaka Hamano

Tohru Ido

A water-soluble metal working oil agent which can be prevented from being scattered in the form of mists for a long period when used for the cutting processing, grinding processing and the like of metallic materials is provided. A method for producing the water-soluble metal working oil agent is described. The water-soluble metal working oil agent includes a polyalkylene oxide having a weight average molecular weight of 100,000 to 1,000,000 and water.

Water-soluble metal working oil agent

A method for producing a medium-molecular weight polyalkylene oxide having a viscosity-average molecular weight of from 100,000 to 2,500,000, including heat-treating a polyalkylene oxide having a viscosity-average molecular weight of 3,000,000 or more at a temperature of from 30&#xb0; to 70&#xb0; C. in an aliphatic hydrocarbon solvent having a dissolved oxygen concentration of 0.5 mg/L or more, in the presence of a radical initiator in an amount of from 0.001 to 1 part by mass, based on 100 parts by mass of the polyalkylene oxide, and thereafter adding an antioxidant to a mixture in an amount of from 0.001 to 5 parts by mass, based on 100 parts by mass of the polyalkylene oxide to remove the solvent. According to the method of the present invention, a medium-molecular weight polyalkylene oxide having a viscosity-average molecular weight of from 100,000 to 2,500,000 which has excellent storage stability can be industrially obtained without subjecting to a gamma-ray irradiation treatment.

Method for producing medium-molecular-weight polyalkyleneoxide

A lower face of a base body () includes a wave-like corrugated surface portion () of which cross-section in a direction perpendicular to a predetermined direction along which cleaning is performed with a cleaning device body () in a planar view is wave-shaped as having a ridge portion () and a valley portion () arranged alternately and continuously. The valley portion () of the wave-like corrugated surface portion () includes an oblique valley portion () of which end part is opened to a side portion of the base body () facing to the predetermined direction as being extended obliquely against the predetermined direction to obliquely guide objects such as dust to be stuck to a cleaning sheet () in accordance with wiping of the surface to be cleaned.

Cleaning device

According to a process for production of alkylene oxide polymers offered by the present invention, an alkylene oxide is subjected to a polymerization reaction under presence of a catalyst in a solvent containing an aliphatic hydrocarbon having from five to seven carbon atoms and a branched structure. The aliphatic hydrocarbon is provided preferably by 2-methyl pentane, 3-methyl pentane, 2,3-dimethyl pentane, 2,4-dimethyl pentane, etc. The alkylene oxide is provided preferably by ethylene oxides and/or propylene oxides.

Process for production of alkyllene oxide polymers

Growing community of inventors

Tokyo, Japan

Makoto Katou