Method for making polysilazanes

Details Method for making polysilazanes Method for making polysilazanes

C - Chemistry, Metallurgy

08

G

261/1, 402/10

C08G 77/62 (2006.01) C04B 35/00 (2006.01) C04B 35/589 (2006.01) C07F 7/10 (2006.01)

Patent

CA 1256632

- 36 - ABSTRACT A method of preparing silazane polymers, with 3 or more repeating units, of the general formula -[((CH3)2N)eSi(R)a(R'HN)fHc(NR')g]- and a (CH3)2NH byproduct group where R is hydrogen, an alkyl group having 1-6 carbon atoms or an aryl group having 6-12 carbon atoms, a=0, or 1, b=2-4, C=0-2, d=0 or 1, e=0-2, f=0-2, g=1-3 and a+c+e+f+g=4 for the polymer units; and R' is hydrogen or methyl, whereby the silazane polymer is substantially free of halide impuriites, and wherein this method comprises: transaminating an aminosilane of the general formula (R)a((CH3)2N)bHcSi where R is defined as above and a+b+c=4 with an amine of the general formula (CH3)dNH3-d whereby d is defined as above and the amine has a molecular weight lower than 45 all in the presence of an acid catalyst or the ammonium salt of the acid and thereafter condensing to form the polymer. D-15023

531217

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