摘要:
Polyurethane is present as a solid phase in a liquid polyorganosiloxane, preferably being formed therein by mixing a polyhydroxy-containing material with the polysiloxane followed by addition of a polyisocyanate. If the polyorganosiloxane contains hydroxyl groups it can be chemically bonded to the polyurethane. The composition can be cured to solid plastic masses of superior properties by adding a curing agent for the polysiloxane.
摘要:
A process for the preparation of an equilibrated acyloxy-containing organopolysiloxane comprising reacting at a temperature of up to 135.degree. C. a chlorosilane of the formulaR.sub.a R'.sub.b SiCl.sub.(4-a-b)whereina=0, 1, 2 or 3b=0, 1, 2 or 3, anda+b is at most 3,or a partial hydrolysis product thereof, with at least one organosiloxane containing the units[R.sub.2 R"--SiO.sub.178 ] [RR"--SiO] [R"--SiO.sub.3/2 ] [SiO.sub.2 ]whereinR and R' each independently is hydrogen or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms, andR" is hydrogen, chlorine, hydroxyl, or an optionally halogen or cyano-substituted monovalent hydrocarbon radical with up to 18 C atoms,in the presence of a proton acid siloxane-equilibration catalyst, and at least about 1.1 times the molar amount of a monobasic carboxylic acid based on the silicon-bonded chlorine atom, the number of all the Si--Cl groups in the reactants exceeding the number of all the Si--OH groups.
摘要:
In a polysiloxane molding composition which can be cured to give flame-repellent products, comprising(a) a diorganopolysiloxane of the formula ##EQU1## in which n is 1.9 to 2.05, andR.sup.1 is an alkyl, alkenyl and/or or aryl radical with 1-8 C-atoms,(b) finely divided TiO.sub.2 with a surface area, measured by the BET method, greater than 20 m.sup.2 /g and a particle size less than 0.5 .mu.m,(d) platinum and/or one of its sulphur-free compounds, and(e) a curing agent,the improvement which comprises about 0.05 to 10% by weight of (a) to (e) of nitrogen compound of the formula ##STR1## in which R is H, phenyl, alkyl with 1-6 C-atoms, tolyl, nitrile, --NHR.sup.2, --CH.sub.2 OR.sup.2, --CH.sub.2 COOR.sup.2, --C(.dbd.NH)NHR.sup.2, --CO--NH--R.sup.2 or (R.sup.1).sub.2 C--,R.sub.2.sup.1 is H, alkyl with 1-6 C-atoms, Si(CH.sub.3).sub.3 -- or R,R.sup.2 is H or --CO--R, andZ is NH, O or NR,or a salt thereof. Articles molded therefrom and then cured are of enhanced flame-repellency.
摘要:
A co-grafted polymer comprising units of organopolysiloxanes with OH functional groups, polyesters and vinyl monomers, polymeric units of the vinyl monomers being linked to the organopolysiloxane and polyester units, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.
摘要:
A textile pile-stabilizing impregnating agent comprising a colloidal suspension of silicic acid having SiO.sub.2 units and organosilsesquioxanes having units of the formula RSiO.sub.3/2 wherein R is an alkyl or aryl radical with up to 7 carbon atoms. It is produced by adding a silane of the formula RSi(OR').sub.3, together with a silane of the formula Si(OR').sub.4, wherein R is an alkyl or aryl radical with up to 7 carbon atoms, and R' is a hydrogen atom or an alkyl radical with 1 to 4 carbon atoms, to a mixture of water and a surface-active agent containing a buffer, the amount of silanes added being about 5 to 22% of the total weight of the addition plus mixture.
摘要:
A graft copolymer comprising (I) as a first polymeric moiety an organopolysiloxane with OH functional groups, (II) as a second polymeric moiety a polyester-urethane and, (III) units of vinyl monomers, units of the first and second polymeric moieties being linked via vinyl polymer bridges, all these units having been polymerized in the presence of mixtures of the first and second polymeric moieties, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.
摘要:
A process for converting the low-boiling constituents formed in the preparation of methylchlorosilane to the Muller-Rochow process and which consist essentially of tetramethylsilane, dimethylmonochlorosilane and 2-methylbut-2-ene into a product mixture consisting essentially of trimethylchlorosilane, dimethylchlorosilane and C.sub.2 -.sub.20 alkyldimethylchlorosilanes or C.sub.6-10 -aryldimethylchlorosilanes, comprising contacting the low-boiling product mixture with AlCl.sub.3, AlOCl and/or AlBr.sub.3, together with hydrogen chloride, in the liquid phase at about 40.degree. to +25.degree. C. The mixture prior to conversion may be contacted with HCl and either ZnCl.sub.2 or active charcoal and/or an olefin may be added thereto.
摘要:
In the addition of an unsaturated compound into a silane of the formulaR.sub.1 R.sub.2 SiXHwhereinX is Cl or Br, andR.sub.1 and R.sub.2 each independently is an alkyl, aryl or aralkyl radical with up to 20 C atoms, or an alkenyl or alkinyl radical with up to 12 C atoms,the improvement which comprises effecting the addition reaction in the presence of at least one of aluminum chloride, aluminum bromide, aluminum oxychloride and aluminum oxybromide.
摘要翻译:在将不饱和化合物加入式R 1 R 2 SiXH的硅烷中,其中X是Cl或Br,并且R 1和R 2各自独立地是具有至多20个C原子的烷基,芳基或芳烷基,或具有上述的链烯基或炔基 至12 C原子,其改进包括在氯化铝,溴化铝,氯氧化铝和氧化铝铝中的至少一种的存在下进行加成反应。
摘要:
In the preparation of catalytic copper with an average particle size between about 0.1 and 100 microns and a copper-I oxide content of about 3 to 100% by oxidation of a Cu powder, the improvement which comprises carrying out the oxidation with oxygen at a reduced partial pressure compared with that of air, the resulting catalyst being of enhanced catalytic activity especially for the reaction of hydrocarbon chlorides with silicon for the production of organochlorosilanes (Rochow synthesis) wherein the desired material is produced in higher yield and greater selectivity.
摘要:
A process for the preparation of a perfluoroalkanesulphonic acid ester of the formulaC.sub.n F.sub.2n+1 SO.sub.3 Si R.sup.1 R.sup.2 R.sup.3comprising reacting a silane of the formulaR.sup.1 R.sup.2 R.sup.3 R.sup.4 Siwith a perfluoroalkanesulphonic acid of the formulaC.sub.n F.sub.2n+1 SO.sub.3 HwhereinR.sup.1, R.sup.2 and R.sup.3 each independently is alkyl with 1 to 6 carbon atoms,R.sup.4 is methyl, andn is from 1 to 12.Compounds wherein the total number of carbon atoms in Cn, R.sup.1, R.sup.2 and R.sup.3 is at least 6 are new and especially useful as silylating agents in organic cyntheses.
摘要翻译:一种制备式C n F 2n + 1 SO 3 Si R 1 R 2 R 3的全氟烷基磺酸酯的方法,包括使式R 1 R 2 R 3 R 4 Si的硅烷与式C n F 2n + 1 SO 3 H的全氟烷基磺酸反应,其中R 1,R 2和R 3各自独立地为具有1至6个碳原子的烷基 原子,R 4为甲基,n为1至12. Cn,R 1,R 2和R 3中的碳原子总数至少为6的化合物是新的,并且特别用作有机核苷酸中的甲硅烷化剂。