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    CHLORINE-CONTAINING SILAZANE POLYMERS, PROCESS FOR THEIR PREPARATION, CERAMIC MATERIALS CONTAINING SILICON NITRIDE WHICH CAN BE PREPARED FROM THEM, AND THEIR PREPARATION
    13.
    发明专利
    CHLORINE-CONTAINING SILAZANE POLYMERS, PROCESS FOR THEIR PREPARATION, CERAMIC MATERIALS CONTAINING SILICON NITRIDE WHICH CAN BE PREPARED FROM THEM, AND THEIR PREPARATION 未知

    公开(公告)号：CA2004404A1

    公开(公告)日：1990-06-03

    申请号：CA2004404

    申请日：1989-12-01

    Applicant: HOECHST AG

    Inventor： VAAHS TILO ,  PEUCKERT MARCELLUS ,  BRUCK MARTIN

    IPC: C04B35/58 ,  C04B35/589 ,  C08G77/48 ,  C08G77/60 ,  C08G77/62 ,  D01F9/10 ,  C01B33/00 ,  C04B35/14

    Abstract: HOE 88/F 343 Chlorine-containing silazane polymers, process for their preparation, ceramic materials containing silicon nitride which can be prepared from them, and their preparation The invention relates to novel chlorine-containing silazane polymers, to their preparation, their further processing to ceramic material containing silicon nitride, and this material itself. In order to prepare the chlorine-containing silazane polymers, oligosilazanes of the formula (I) in which a > 0, b 2 0 and n is about 2 to about 12, are reacted with at least one of the chlorosilanes Cl2R4Si-CH2-CH2-SiR4Cl2, Cl3Si-CH2-CH2-SiR5Cl2, R5SiCl3 or R7SiHCl2 at 30.degree.C to 300.degree.C, where, independently of one another, R1 and R2 = H, C1-C6-alkyl or C2-C6-alkenyl, R3, R4, R5, R6 and R7 = C1-C6-alkyl or C2-C6-alkenyl and where if b = 0 the reaction with R7SiHCl2, if R7 = C1-C6-alkyl and none of the other chlorosilanes is present, is to be excluded. The chlorine-containing silazane polymers according to the invention can be converted by reaction with ammonia into polysilazanes, which in their turn can be pyrolysed to form ceramic materials containing silicon nitride.

    POLYSUBSTITUTED OLIGOSILAZANES AND PROCESS FOR THEIR PREPARATION
    14.
    发明专利
    POLYSUBSTITUTED OLIGOSILAZANES AND PROCESS FOR THEIR PREPARATION 未知

    公开(公告)号：CA2004402A1

    公开(公告)日：1990-06-03

    申请号：CA2004402

    申请日：1989-12-01

    Applicant: HOECHST AG

    Inventor： VAAHS TILO

    IPC: C01B21/068 ,  C07F7/10 ,  C08G77/48 ,  C08G77/62

    Abstract: Polysubstituted oligosilazanes and process for their preparation The invention relates to novel polysubstituted oligosilazanes and to a process for their preparation. The process comprises reacting excess ammonia with a starting material containing at least one of the two components (I) R1R2SiCl2 and (II) Cl2R3Si-CH2CH2-SiR3Cl2 and at least one of the two components (III) R4SiCl3 and (IV) Cl3Si-CH2CH2-SiR5Cl2, at -70 to +100.degree.C, where the radicals independently of one another have the following meanings: R1, R2, R4 = H, C1-C6 alkyl or C2-C6 alkenyl and R3, R5 = C1-C6 alkyl or C2-C6 alkenyl, and the molar percentage of (I) or (II) or a mixture thereof in the starting material is 30 to 99%, and where the reaction of a mixture containing only (I) and (III) with ammonia shall be excluded. The oligosilazanes according to the invention can be converted into polymeric chlorosilazanes by means of a further reaction with chlorosilanes, and said polymeric chlorosilazanes can in turn be converted initially into polysilazanes and then into ceramic materials containing silicon nitride.

    POLYMERIC HYDRIDOCHLOROSILAZANES, PROCESS FOR THEIR PREPARATION, CERAMIC MATERIALS CONTAINING SILICON NITRIDE WHICH CAN BE MANUFACTURED THEREFROM, AND THEIR MANUFACTURE
    15.
    发明专利
    POLYMERIC HYDRIDOCHLOROSILAZANES, PROCESS FOR THEIR PREPARATION, CERAMIC MATERIALS CONTAINING SILICON NITRIDE WHICH CAN BE MANUFACTURED THEREFROM, AND THEIR MANUFACTURE 未知

    公开(公告)号：CA2004399A1

    公开(公告)日：1990-06-03

    申请号：CA2004399

    申请日：1989-12-01

    Applicant: HOECHST AG

    Inventor： VAAHS TILO ,  GERDAU THOMAS ,  KLEINER HANS-JERG ,  PEUCKERT MARCELLUS ,  BRUCK MARTIN

    IPC: C04B35/58 ,  C04B35/589 ,  C08G77/48 ,  C08G77/62 ,  D01F9/10 ,  C08G77/54 ,  C04B35/14

    Abstract: HOE 88/F 340 Polymeric hydridochlorosilazanes, process for their preparation, ceramic materials containing silicon nitride which can be manufactured therefrom, and their manufacture The invention relates to novel polymeric hydridochlorosilazanes, to their preparation, to their processing to form ceramic materials containing silicon nitride, and to said materials themselves. The polymeric hydridochlorosilazanes are prepared by reacting oligohydridoorganosilazanes of the general formula (R1SiHNH)n, in which n is about 3 to about 12, with at least one of the chlorosilanes R2SiHCl2, R3SiCl3, Cl2R4Si-CH2CH2-SiR4Cl2 or Cl3Si-CH2CH2-SiR5Cl2 at 30.degree.C to 300.degree.C, where the radicals independently of one another have the following meanings: R1 = a C1-C6 alkyl or C2-C6 alkenyl group, R2 = a C2-C6 alkenyl group if R2SiHCl2 is reacted with the oligosilazanes by itself, or R2 = a C1-C6 alkyl or C2-C6 alkenyl group if R2SiHCl2 is reacted with the oligosilazanes as a mixture with other chlorosilanes, and R3, R4, R5 = a C1-C6 alkyl or C2-C6 alkenyl group, and where R3SiCl3 is used only as a mixture with at least one of the other chorosilanes (containing R2, R4 or R5). The polymeric hydridochlorosilazanes according to the invention can be converted into polysilazanes by reaction with ammonia, and these in turn can be pyrolyzed to form ceramic materials containing silicon nitride.

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