Idemitsu Kosan Company, Limited

Masami Takasaki

Meishi Tanaka

Masashi Nakamura

Kazuhiro Teshima

Hisao Anzai

Akihito Abe

Chisato Endo

Mitsuo Hashimoto

Toshiyuki Takyu

Masaru Inoue

Shinho Shiho

The present invention is related to a process oil using as a raw material a deasphalted oil obtained by deasphalting a vacuum residual oil of a crude oil and a manufacturing method of the process oil, the process oil having properties of: The present invention is also related to a process oil and a manufacturing method of the process oil, the process oil obtained by mixing: an extract obtained by deasphalting and solvent-extracting a vacuum residual oil of a crude oil; and a lubricant base oil having a polycyclic aromatics (PCA) content of less than 3 mass %, and having properties of:

Process oil, process for production of deasphalted oil, process for production of extract, and process for production of process oil

A process oil which satisfies the requirements of (a) a content of a polycyclic aromatic compound of less than 3% by weight, (b) a content of an aromatic hydrocarbon of 18% by weight or more, (c) a content of a polar compound ranging from 11 to 25% by weight, (d) a kinematic viscosity at 100&deg; C. ranging from 10 to 70 mm /s, and (e) a flash point of 210&deg; C. or more.

Process oil, process for producing the same and rubber composition

The processing oil contains polycyclic aromatic hydrocarbon, which is a substance known to be toxic to the human body, in an amount of less than 3 wt. % and an aromatic hydrocarbon in an amount of 25 wt. % or more, and has a kinematic viscosity at 100&deg; C. of 10-30 mm /s, a density of 0.870-970 g/cm , and a 5 vol. % recovery temperature of 370-530&deg; C. The processing oil exhibits excellent performance which has conventionally been obtained. The processing oil can be produced by a method in which oil mixture comprising an extract obtained through extraction from mineral oil by use of a polar solvent in an amount of 40-97 vol. % and lubricating base oil in an amount of 3-60 vol. % is subjected to extraction treatment by use of a polar solvent.

Processing oil and method for producing the same

Process oil which satisfies requirements that a content of a polycyclic aromatic compound is less than 3% by weight, a content of an aromatic hydrocarbon is 18% by weight or more, a content of a polar compound is between 11 and 25% by weight, a kinematic viscosity at 100&deg; C. is between 10 and 70 mm /s, and a flash point is 210&deg; C. or more.

A gypsum composition comprising: (A) a lightweight spherical gypsum and (B) at least one binder selected from the group consisting of a water-soluble organic polymer, a water-dispersible organic polymer, a water-soluble inorganic compound, a water-dispersion medium colloid-forming inorganic compound, a water-hardenable compound and a mixture thereof. This gypsum composition provides a gypsum mold which is lightweight and, at the same time, has great mechanical strength.

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Sodegaura, Japan

Masami Takasaki