METHOD FOR MAKING POLYSILAZANES

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,...

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Bibliographische Detailangaben
Hauptverfasser:	KANNER, BERNARD, KING, ROSWELL E., III, HOPPER, STEVEN P, SCHILLING, CURTIS L., JR
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS REFRACTORIES SLAG THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	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