Tonen Corporation

Toa Nenryo Kogyo Kabushiki Kaisha

Clariant Finance (bvi) Limited

Yuuji Tashiro

Takeshi Isoda

Osamu Funayama

Mikiro Arai

Hiroyuki Aoki

Yasuo Shimizu

Tadashi Suzuki

Toshio Katahata

Kiyoshi Sato

Toshihide Kishi

Tomoko Aoki

Hayato Nishii

Tomohiro Kato

Genshiro Nishimura

Mutsuo Haino

Ichiro Kohshi

Masaaki Ichiyama

Hiroshihi Kaya

Takayuki Date

Rika Takatsu

Kouji Okuda

A method for sealing a fine groove with a siliceous material, characterized as comprising applying a solution of a perhydropolysilazane having a weight average molecular weight in the range of 3,000 to 20,000 in terms of polystyrene to a substrate having at least one groove having a width of 0.2 &mgr;m or less at its deepest portion and having a ratio of the corresponding depth to the width of 2 or more, to thereby fill and seal the groove with the perhydropolysilazane, and then heating the perhydropolysilazane in an atmosphere containing water vapor to thereby convert the perhydropolysilazane to a siliceous material.

Method for sealing fine groove with siliceous material and substrate having siliceous coating formed thereon

Polyorganosiloxazanes and process for the preparation thereof

A stabilized polysilazane obtained by reacting an inorganic polysilazane having a number average molecular weight of about 100 to about 100,000 with an alcohol, an organic acid, an ester, a ketone, an aldehyde, a mercaptan, or an alkysilazane preferably at a molar ratio of from 50/50 to 99.99/0.01 is described.

Modified polysilazane and process for preparation thereof

A thermoplastic silicon-containing polymer, which may be a precursor of SiC, and which can be transformed to a thermosetting polymer by copolymerizing it with a thermosetting perhydropolysilazane or polyborosilazane.

Thermosetting copolymers, silicon carbide-based fiber and processes 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

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 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

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Iruma, Japan

Yuuji Tashiro