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:
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 carbamatoorganosilanes (S) of the general formula (7) in which a haloorganosilane (S1) of the general formula (8) X—R2—SiR3(3-x)(OR4)x (8) is reacted with a metal cyanate (MOCN) and an alcohol (A) of the general formula (9) R1OH (9) in the presence of at least one aprotic solvent (L), where R1, R3 and R4 are each an unsubstituted or halogen-substituted hydrocarbyl radical having 1-10 carbon atoms, R2 is a divalent unsubstituted or halogen-substituted hydrocarbyl radical which has 1-10 carbon atoms and may be interrupted by nonadjacent oxygen atoms, X is a halogen atom, and x is a value of 0, 1, 2 or 3, where the removal of the solid metal halides formed as by-products and of any solid metal cyanate residues still present is preceded by distillative removal of at least 50% of the solvent (L).
Abstract:
The invention relates to a method for producing silicon compounds (A) having hydrocarbon oxy-groups that have at least one unit of the general formula (1) HmSi (OR)n (OR′) oR″pX4-m-n-o-p (1) by conversion of silicon compounds (B) having at least one unit of the general formula (2) Hm+nSi(OR′)oR″pX4-m-n-o-p (2), having an alcohol of the general formula (3) ROH (3) in the presence of a catalyst (K) that is on a carrier material bonded metal selected from Ni, Pd, Pt, wherein per mol formed group OR, at maximum 1 liter of solvent is used and wherein R, R′, R″, X, m, n, o and p have the meanings listed in claim 1.
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.
Abstract:
The invention relates to organopolysiloxane compounds which can be stored subject to the exclusion of moisture, can be cross-linked by cleaving of alcohols to form elastomers when moisture gains access at room temperature and are based on (A) polydiorganosiloxanes with organyloxy groups, optionally (B) organyloxy functional cross-linkers with at least three organyloxy groups, and optionally (C) condensation catalysts, characterised in that they contain at least one (D) compound selected from the compounds (D.sub.a) to (D.sub.f) given in claim 1.
Abstract:
The invention relates to aliphatically unsaturated organosilicon compounds having 2 to 17 silicon atoms, to processes for their preparation and to their use in crosslinkable organopolysiloxane compositions, especially in compositions which can be crosslinked peroxidically or by hydrosilylation.
Abstract:
The description relates to novel organo(poly)siloxanes of the general formula (I): (R.sup.1 O).sub.a HSiR.sub.2-a O[SiR .sub.2 O].sub.n SiR.sub.2 R.sup.2, in which R and R.sup.2 are the same or different and represent a monovalent, possibly substituted hydrocarbon radical; R.sup.1 is the same or different and represents a monovalent, possibly substituted hydrocarbon radical; n is a whole number of at least 2; and a is 1 or 2. The organo(poly)siloxanes are used as additives in materials which can be cross-linked to form organopolysiloxane elastomers.