EP0434428A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method for manufacturing a hafnium-containing silazane polymer and a method for manufacturing a ceramic from said polymer
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1990-12-20
•
Granted: —
•
Expires: 2010-12-20
Abstract
Abstract A hafnium-containing silazane polymer is obtained through a polymerization reaction of which the reactants are (A) a halide of an organic silicon compound; (B) a hafnium compound having a general formula [I]: HfX₄ [I] wherein X is chlorine or bromine; and (C) a disilazane having a general formula [II]: wherein R₁, R₂ and R₃ are hydrogen, methyl, ethyl, phenyl or vinyl, and can be the same or different from each other.
Inventors
- 👤 Yoshihumi Takeda
- 👤 Akira Hayashida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C08; C08G; C08G77/00; C08G77/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A method for manufacturing a hafnium-containing silazane polymer characterized by obtaining a hafnium-containing silazane polymer through a polymerization reaction of which the reactants are (A) a halide of an organic silicon compound; (B) a hafnium compound having a general formula [I]: wherein X is chlorine or bromine; and (C) a disilazane having a general formula [II]: wherein R₁, R₂ and R₃ are hydrogen, methyl, ethyl, phenyl or vinyl, and can be the same or different from each other.
Claim 2
Dependent Claim
18 words
A method of Claim 1 wherein the reactants (A), (B) and (C) are kept in a waterless atmosphere.
Claim 3
Dependent Claim
21 words
A method of Claim 1 wherein the reactants (A), (B) and (C) are reacted at a temperature between 25°C and 350°C.
Claim 4
Independent Claim
103 words
A method for manufacturing a ceramic from a hafnium-containing silazane polymer manufactured through a polymerization reaction of which the reactants are (A) a halide of an organic silicon compound; (B) a hafnium compound having a general formula [I]: wherein X is chlorine or bromine; and (C) a disilazane having a general formula [II]: wherein R₁, R₂ and R₃ are hydrogen, methyl, ethyl, phenyl or vinyl, and can be the same or different from each other; said ceramic manufacturing method characterized by comprising the steps of: fusing said hafnium-containing silazane polymer; shaping the fused polymer; infusibilizing the shaped polymer; and baking the infusibilized polymer.
Claim 5
Dependent Claim
14 words
A ceramic article based on Si-Hf-C-N composition made by the method of Claim 4.
Claim 6
Dependent Claim
14 words
A ceramic article based on Si-Hf-C-N-O composition made by the method of Claim 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.