Toa Nenryo Kogyo Kabushiki Kaisha

Tonen Corporation

Petroleum Energy Center

Tao Nenryo Kogyo K.k.

Mikiro Arai

Takeshi Isoda

Osamu Funayama

Hayato Nishii

Yuuji Tashiro

Tadashi Suzuki

Hiroyuki Aoki

Tomohiro Kato

Toshio Katahata

Kiyoshi Sato

Ichiro Kohshi

Takuji Itoh

Toshiaki Kuribayashi

Hiroshi Kaya

Hironari Ueda

Hitoshi Ohenoki

Genshiro Nishimura

Masaaki Ichiyama

Mutsuo Haino

Kouichi Yasuda

Hiroshihi Kaya

Atsuro Takazawa

Tamio Ishiyama

The invention provides a fluid composition for a fluid coupling, which is excellent in viscosity stability and torque stability, and comprises a polyorganosiloxane base oil having a viscosity of 3,000-500,000 mm.sup.2 /sec at 25.degree. C. and at least one 5-membered heterocyclic compound incorporated in a proportion of 0.01-3.0 wt. % based on the total weight of the composition, said 5-membered heterocyclic compound being selected from the group consisting of thiadiazole derivatives and thiazole derivatives, both, having at least one monovalent group represented by the formula --S.sub.x --R.sup.6 in which R.sup.6 is a saturated or unsaturated monovalent group or atom composed of at least one atom selected from a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom and a sulfur atom, and x is a number of 1 or greater.

Fluid composition for fluid coupling

Novel polysiloxazanes comprising [SiH.sub.2).sub.n NH-- and [SiH.sub.2).sub.m O-- as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with a Lewis base, with ammonia and water vapor or oxygen. From the polysiloxazane, novel silicon oxynitride shapes can be produced and the silicon oxynitride shapes are essentially composed of silicon, nitride (5 mol % or more) and oxygen (5 mol % or more).

Polysiloxazanes, silicon oxynitride fibers and processes for producing

A molded body formed of a silicon nitride-based ceramic containing Si and N and optionally O, C and/or a metal. The ceramic is formed from a polysilazane. A molded body may be a composite body which is composed of a matrix of the ceramic and a reinforcing material such as powder or fiber embedded within the matrix or which is composed of ceramic powder bound with a binder formed of the silicon nitride-based ceramic.

Molded articles formed of silicon nitride based ceramic and process for

A shaped body is disclosed which comprises substantially amorphous, silicon nitride-based ceramic containing Si, N and B as essential components and O, C and H as optional components in amounts providing the following atomic ratios:

Boron-containing, silicon nitride-based ceramic shaped body

Novel polysiloxazanes comprising --SiH.sub.2).sub.n NH] and --SiH.sub.2).sub.m O] as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with a Lewis base, with ammonia and water vapor or oxygen. From the polysiloxazane, novel silicon oxynitride shapes can be produced and the silicon oxynitride shapes are essentially composed of silicon, nitride (5 mol % or more) and oxygen (5 mol % or more).

Silicon nitride based ceramic fibers containing Si, N, O and at least one metal M in amounts providing the atomic ratios N/Si of 0.3 to 3, O/Si of 0.0001 to 15 and M/Si of 0.001 to 5 and exhibiting an X-ray small angle scattering such that the ratio of the intensity of the small angle scattering of the fibers to that of air is 1 to 20. The ceramic fibers are produced by spinning of a polymetallosilazane into fibers and calcining the spun fibers and are useful as reinforcing fibers for composite artices having a metal or resin matrix.

Silicon nitride based ceramic fibers, process of preparing same and

Disclosed is a polyborosilazane having a B/Si atomic ratio of 0.01 to 3 and a number-average molecular weight of about 200 to about 500,000 which can be pyrolyzed to give ceramics. The polyborosilazane is produced by reacting a polysilazane having a number-average molecular weight of about 100 to about 50,000 with a boron compound.

Polyborosilazane and process for producing same

A novel, reformed polysilazane obtained by reacting a polysilazane with a compound selected from ammonia, primary and secondary amines, hydrazine and mono-, di- and tri-substituted hydrazines to cross-link the polysilazane with the compound serving as a cross-linking agent or to link the compound to the polysilazane.

Reformed polysilazane and method of producing same

Novel polysiloxazanes comprising --SiH.sub.2).sub.n NH-- and --SiH.sub.2).sub.m O-- as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with a Lewis base, with ammonia and water vapor or oxygen. From the polysiloxazane, novel silicon oxynitride shapes can be produced and the silicon oxynitride shapes are essentially composed of silicon, nitride (5 mols % or more) and oxygen (5 mol % or more).

A novel, reformed, inorganic polysilazane which is liquid or solid at room temperature and soluble in o-xylene at room temperature and which has (a) a number-average molecular weight of 200-500,000, (b) contents of Si, N and H of 50-70% by weight, 20-34% by weight and 5-9% by weight, respectively; and (c) --SiH.sub.2 -- and --SiH.sub.3 groups, the molar ratio of the --SiH.sub.2 -- groups to the --SiH.sub.3 groups being 2.0:1 to 8.4:1. The reformed polysilazane is obtained by reaction of a solution of a polysilazane in an organic base-containing solvent to polycondense the polysilazane.

Reformed, inorganic polysilazane

A novel polymetalosilazane having a metal/silicon atomic ratio of from 0.001 to 3 and a number average molecular weight of about 200 to 500,000 is prepared by a process comprising: reacting a polysilazane having a number average molecular weight of about 100 to 500,000, which has a skelton consisting substantially of units ##STR1## at least one R being hydrogen, with a metal alkoxide in which the metal is selected from metals of the groups IIA and III to V of the Periodic Table.

Polymetalosilazane and process for preparing same

Novel polysiloxazanes comprising [(SiH.sub.2).sub.n NH] and [(SiH.sub.2).sub.m O] as the main repeating units are provided. The polysiloxazanes are produced by reacting a dihalosilane or an adduct thereof with a Lewis base, with ammonia and water vapor or oxygen. From the polysiloxazane, novel silicon oxynitride shapes can be produced and the silicon oxynitride shapes are essentially composed of silicon, nitride (5 mol % or more) and oxygen (5 mol % or more).

Processes for producing polysiloxazanes and silicon oxynitride fibers

Reformed, inorganic polysilazane and method of producing same

Novel primarily chain inorganic polysilazanes of average molecular weight of 690 to 2000 are prepared from novel adducts of a halosilane and a base by reacting the adducts with ammonia in unreactive solvents. Silicon nitride is prepared by heating the polysilazanes at 1000.degree. to 1600.degree. C., preferably below 1300.degree. C., most preferably 1000.degree. to 1100.degree. C.

Inorganic polysilazane and method of producing the same

Silicon nitride fibers having a carbon content of 5 weight percent or less have high heat insulating properties and favorable mechanical properties and are useful as heat resistant, highly insulating materials or reinforcing agents for composite materials, particularly in the aerospace industry. Such high purity silicon nitride fibers are produced by spinning a solution of perhydropolysilazanes, an inert solvent and a spinning agent into fibers, preferably continuous fibers, and firing the spun fibers at 800.degree. to 1300.degree. C. in an inert atmosphere to form silicon nitride fibers of high purity.

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Iruma, Japan

Mikiro Arai