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US 5,210,058 AGranted
Method for preparing organic silazane polymers and method for preparing ceramics from the polymers
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYoshihumi Takeda, Akira Hayashida, Toshinobu Ishihara
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Abstract
An organic silazane polymer is prepared by reacting ammonia gas with a mixture of a trihalosilane and a monohalosilane, for example, methyltrichlorosilane and trimethylchlorosilane in an organic solvent to form a silazane compound, and heating the silazane compound at 200 to 350.degree. C. for polymerization. By melting, shaping, infusibilizing, and firing the silazane polymer, there is obtained a ceramic material.
Claims10
A method for preparing an organic silazane polymer comprising the steps of:
- reacting ammonia gas at a temperature of from -20.degree. to 150.degree. C. with a mixture of 10 to 45 mol % of an organic silicon compound of the general formula (I):
- R.sup.1 SiX.sub.3 (I)
- wherein R.sup.1 is selected from the group consisting of a hydrogen, methyl, ethyl, phenyl and vinyl, and X is chlorine or bromine and 90 to 55 mol % of another organic silicon compound of the general formula (II):
- R.sup.2 R.sup.3 R.sup.4 SiX (II)
- wherein R.sup.2, R.sup.3 and R.sup.4 are independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl and vinyl, and X is chlorine or bromine in an organic solvent to form a silazane compound, and
- heating the silazane compound at a temperature of 200.degree. to 350.degree. C. for 1 hour to 5 hours in the absence of packing to polymerize the silazane compound.
3 more elements
Dependencies are inferred from the claim text.