Abstract:
The invention relates to a method for hydrolyzing hydrolyzable metallic salts, the metallic salts being reacted with emulsions of a) water and b) an inert liquid.
Abstract:
New organopolysiloxane masses cross-linkable into elastomers by radical formation containing (1) high-viscosity diorganopolysiloxanes with a value equal to at least 3000 Nm, (2) low-viscosity vinyl-containing organopolysiloxanes having 20 to 1.10.sup.6 mPa.multidot.s at 25.degree. C. consisting of siloxane units (M units) having the formulae R.sup.1 R.sub.2 SiO.sub.1/2 and/or R.sub.3 SiO.sub.1/2, of siloxane units (D units) having the formulae R.sup.1 RSiO and/or R.sub.2 SiO and optionally HRSiO, and of siloxane units (T or Q units) having the formulas RSiO.sub.3/2 and/or R.sub.1 SiO.sub.3/2 and/or SiO.sub.2, in which R stands for a monovalent, possibly substituted hydrocarbon residue with 1 to 18 hydrocarbon atoms and R.sub.1 stands for a vinyl residue, provided that the organopolysiloxanes contain at least 1.0% by weight Si-bound vinyl groups; as well as (3) fillers.
Abstract:
The present invention relates to the organopolysiloxanes having the formula[R.sup.1 Si(OSiR.sup.2.sub.2 X).sub.2 OSiR.sup.2.sub.2 O.sub.1/2 ].sub.a [R.sub.3 SiO.sub.1/2 ].sub.b [R.sub.2 SiO].sub.c [RSiO.sub.3/2 ].sub.d [SiO.sub.2 ].sub.e (1),whereR is optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon radicals,R.sup.1 is an optionally substituted C.sub.6 - to C.sub.15 -hydrocarbon radical having at least one phenyl ring,R.sup.2 is a C.sub.1 - to C.sub.3 -hydrocarbon radical,X is a hydrogen atom or an organic or organosilicon functional group bonded via a divalent, optionally substituted C.sub.2 - to C.sub.15 -hydrocarbon radical, with one or more methylene units of the hydrocarbon radical being able to be replaced by oxygen atoms bonded on both sides to carbon atoms,a is an integer of at least 1 andb, c, d and e are each 0 or a positive integer, and the sum of a, b, c, d and e is at least 3, and the process for the preparation thereof.
Abstract translation:本发明涉及具有式[R1Si(OSiR22X)2OSiR22O1 / 2] a [R3SiO1 / 2] b [R2SiO] c [RSiO3 / 2] d [SiO2] e(1)的有机聚硅氧烷,其中R是任选取代的C1 至C 18烃基,R 1为具有至少一个苯环的任选取代的C 6至C 15 - 烃基,R 2为C 1至C 3烃基,X为氢原子或有机或有机硅官能团键合 通过二价,任选取代的C 2 -C 15烃基与烃基的一个或多个亚甲基能够被两侧键合在碳原子上的氧原子代替,a是至少为1的整数,b ,c,d和e各自为0或正整数,a,b,c,d和e之和为3以上。
Abstract:
Solid alkali metal salts of organosilanols and/or their hydrolysis/condensation products are prepared by hydrolysis of organosilanes in water and in the presence of a basic alkali metal salt. The products contain predominately methyl and ethyl organic groups, and C4 or higher hydrocarbon groups as well. The solid salts effectively hydrophobe building materials, while being easily mixed with water.
Abstract:
Polydiorganosiloxanes of the general formula R1—(OSiR2)nOH (I) are prepared by reacting hexaorganocyclotrisiloxanes of the formula (R2SiO)3 (II) with alcohols of the formula R1—OH (III) where each R is the same or different and is a monovalent, optionally substituted hydrocarbon radical, R1 is a monovalent, optionally substituted hydrocarbon radical and n is an integer of at least 3, in the presence of a carbonate salt as a catalyst.
Abstract:
A process for the preparation of organopolysiloxanes which contain at least one unit of the formula (R.sup.1 O).sub.3-m R.sub.m SiO.sub.1/2 (I) in which R is identical or different and is a hydrogen atom or monovalent, optionally substituted hydrocarbon radical, R.sup.1 is identical or different and is a monovalent, optionally substituted hydrocarbon radical having 1 to 8 carbon atoms and m is 0, 1 or 2, which comprises, in a 1st step, reacting organosilicon compounds (1) which contain at least one Si-bonded hydroxyl group with at least one silane (2) of the formula (R.sup.1 O).sub.4-m SiR.sub.m (II) and/or partial hydrolysates thereof, in which R, R.sup.1 and m have the above mentioned meaning, in the presence of a fluoride salt (3), and, optionally, in a 2nd step, when the reaction has ended, adding component (4) which can bond fluoride ions.
Abstract:
A process for preparing organo(poly)siloxanes of the formulaR.sup.1 R.sub.2 Si(OSiR.sub.2).sub.m (OSiR.sub.2).sub.n OHwhich comprises reacting a hexaorganocyclotrisiloxane of the formula(R.sub.2 SiO).sub.3with a sil(ox)anol of the formulaR.sup.1 R.sub.2 Si(OSiR.sub.2).sub.m OHin the presence of a catalyst which contains fluoride ions, in which R is the same or different and represents a monovalent, optionally substituted hydrocarbon radical, R.sup.1 represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical, m is 0 or an integer of at least 1 and n is an integer of at least 3.An alkali metal fluoride or an alkali metal fluoride bonded to a support material is preferably used as the catalyst in the process of this invention.
Abstract translation:制备式R 1 R 2 Si(OSiR 2)m(OSiR 2)n OH的有机(聚)硅氧烷的方法,其包括使式(R 2 SiO)3的六有机基三硅氧烷与式R 1 R 2 Si(OSiR 2)m OH的硅(ox) 存在含有氟离子的催化剂,其中R相同或不同并且表示一价的任选取代的烃基,R 1表示氢原子或一价,任选取代的烃基,m为0或至少为整数 1,n为3以上的整数。作为本发明方法中的催化剂,优选使用与载体材料结合的碱金属氟化物或碱金属氟化物。
Abstract:
Organosilanolate powders having a low cation to silicon ratio provide superior hydrophobing ability. The powders may be prepared on an industrial scale by hydrolysis of a silane with a basic salt solution, adding an inert organic solvent, and removing gaseous or alcoholic hydrolysis products by evaporation or distillation, precipitating the organosilanolate as a fine powder.
Abstract:
The invention provides a process for preparing silylorganoamines of the general formula (1) R′3-nR1nSi—R2—NR3—R4—SiR″3-mR5m (1) by reacting (aminoorganyl)silanes of the general formula (2), H—NR3—R4—SiR″3-mR5m (2) with (haloorganyl)silanes of the general formula (3) R′3-nR1nSi—R2—X (3), where R′, R″, R1, R2, R3, R4, R5, X, m and n are each defined as per claim 1, said reaction comprising the following steps: a) reacting the (haloorganyl)silane of the general formula (3) and the (aminoorganyl)silane of the general formula (2) at a temperature of 0 to 250° C. to form, as well as the silylorganoamine of the general formula (1), the ammonium halide of the (aminoorganyl)silane of the general formula (2) as a by-product, b) adding a base (B), which results in complete or partial ester interchange, in which the (aminoorganyl)silane of the general formula (2) is released again and forms the halide of the base (B), the halide of the base (B) being liquid at temperatures of at most 200° C., and c) removing the liquid halide formed from the base (B).
Abstract:
The invention concerns polysiloxane compounds which contain the following components: 1. organopolysiloxane with at least two aliphatic double bonds in the molecule; 2 organopolysiloxane with at least two Si—H groups in the molecule; 3. noble metal catalyst; and 4. hydrophilic modifier of general formula (I) [H2C═CH—A1—(A2)m—X]nB (I), in which A1, A2, X, B, m and n have the meanings given in claim 1. The polysiloxane compounds are stable during storage and are used as dental casting compounds.