Process for the preparation of poly(disilyl)silazane polymers and the polymers therefrom
Patent 4340619 Issued on July 20, 1982. Estimated Expiration Date: 
January 15, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 15, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3738906 3853567 3882210 3892583 Process for preparing layers of silicon carbide on a silicon substrate Method of forming a silicon carbide article Method of producing dense sintered silicon carbide body from polycarbosilanes Process for producing corrosion-, heat- and oxidation-resistant shaped article Patent #: 4267211 InventorAssigneeApplicationNo. 06/225274 filed on 01/15/1981US Classes:427/228, Coating decomposed to form carbide or coating carbonized264/29.2, Filaments264/29.5, With carbonizing, then adding carbonizable material and recarbonizing264/29.6, In specific atmosphere (except vacuum or air)427/387, Silicon compound containing coating428/408, SELF-SUSTAINING CARBON MASS OR LAYER WITH IMPREGNANT OR OTHER LAYER428/447, As siloxane, silicone or silane521/154, Cellular product derived from silicon containing reactant521/919, SINTERED PRODUCT528/31, Silicon reactant contains a silicon-to-hydrogen bond528/32, Silicon reactant contains an ethylenically unsaturated group528/33, Silicon reactant contains two or more silicon atoms528/36, Silicon reactant contains at least one halogen atom bonded to a carbon atom which carbon atom is not an acyl halide carbon atom528/38Silicon reactant contains an amine nitrogen atomExaminersPrimary: Smith, John D.Assistant: Page, Thurman K. Attorney, Agent or FirmInternational ClassesC08G 77/00 (20060101)C08G 77/62 (20060101) C08L 83/16 (20060101) C08L 83/00 (20060101) C01B 31/00 (20060101) C01B 31/36 (20060101) C04B 35/571 (20060101) C04B 35/565 (20060101) AbstractWhat is disclosed is a process for preparing R'3 SiNH-containing silazane polymers by contacting and reacting chlorine-containing disilanes with {R'3 Si}2 NH where R' is vinyl, hydrogen, an alkyl radical of 1-3 carbon atoms or the phenyl group. The silazane polymers are useful as chemical intermediates to produce silicon-containing chemical compounds. They are also useful in the formation of silicon carbide-containing ceramic materials.Field of SearchSilicon reactant contains a silicon-to-hydrogen bondSilicon reactant contains an ethylenically unsaturated group Silicon reactant contains two or more silicon atoms Silicon reactant contains at least one halogen atom bonded to a carbon atom which carbon atom is not an acyl halide carbon atom | |
