Rugged optical fibre - filament coated with hexa:methyl di:silazane di:methyl polysiloxane filled di:methyl polysiloxane and silicone methyl polymerAn optical fibre is quartz glass surrounded by an optically effective polymer envelope of several layers, namely an innermost layer of a hexamethyl disi...
A1 Abstract: Prepn. of new phosphorylated N-(triorganosilyl)- amides of formula (R1O)(R2Y)P(X)-NH-SiR3R4R5 (I) comprises reacting phosphoric acid diester amides (or mono- or di-thio analogues) of formula (R1O)(R2Y)P(X)NH2 (II) with hexa-organo-disilazones of formula NH(SiR3...
Hexa:methyl-di:silazane prepn. from tri:methyl-chloro-silane - and ammonia, with sepn. of ammonium chloride formed by centrifugingHexamethyl-disilazane is prepd. by reacting trimethylchlorosilane with gaseous ammonia, hexamethyl-disilazane being used as solvent. The ammonium chloride formed during ...
Organic chromium cpds. derived from hexa:methyl-di:silazane - and chromium chloride, with ligand incorporation, used in polymerisation catalyst prepn.Organic Cr cpds. claimed have formula Cr N(SiMe3)2 nLL', (I), (in which each L and L' is a 4-18C cyclic or acyclic ether, tert. 6-...
Olefin polymerisation catalyst prepn. - by activating carrier impregnated with organic chromium cpd., e.g. derived from hexa:methyl di:silazaneOlefin polymerisation catalyst is prepd. by applying a Cr cpd. (I) on a carrier having specific surface 50-900 m2/g and average pore dia. (2 x ...
From the HO-terminated polyesters, polyesters with high molecular weight were synthesized by a chain-extending reaction with octamethylcyclotetrasilazane (OMCT) or hexaphenylcyclotrisilazane (HPCT) as chain-extenders. Gel permeation chromatography (GPC) characterization shows that the M n of chain-...
Protection of hydroxy-gps. using hexa:methyl:di-silazane - by reaction in presence of cation exchanger and small amts. of waterPrepn. of hydrocarbons contg. C-OSiMe3 units comprises reaction of aliphatic- or aromatic-bound C-OH gps. with hexamethyl disilazane in the presence of an acid ...
Hexa:methyl-di:silazane prepn. from tri:methyl-chloro-silane - and ammonia, with sepn. of ammonium chloride formed by centrifugingHexamethyl-disilazane is prepd. by reacting trimethylchlorosilane with gaseous ammonia, hexamethyl-disilazane being used as solvent. The ammonium chloride formed during ...
High yield prodn. of silylated prim. or sec. amine(s) - by solventless reaction of amine(s) with hexa:methyl:di:silazane in presence of specified amt. of waterPrepn. of silylated prim. or sec. amines is by reaction of amines of b.pt. above 50 deg.C with hexamethyldisilazane in ...
Organic isocyanate cpds. prepd. from prim. amine(s) - by reaction with carbon di:oxide and hexa:methyl:di:silazane with an acid catalystOrganic isocyanates are prepd. by reacting (1-6C) prim. amine with carbon dioxide and hexamethyldisilazane in the presence of an acid catalyst at 40-200...