摘要:
Linear organopolysiloxanediols are prepared by continuously introducing cyclic organopolysiloxanes, water in an amount of at least 14 mols per gram atom of silicon contained in the cyclic organopolysiloxanes used and water-soluble acid into a recirculating reactor and thereafter separating the aqueous phase from the organopolysiloxanediols more or less immediately after the reaction mixture exits from the recirculating reactor.
摘要:
The invention relates to self-adhesive thermally crosslinkable 1-component silicone compositions which contain the components defined in claim 1 (A) diorganopolysiloxane, (B) filler which is selected from filler (B1) having a specific surface area of at least 50 m2/g, aluminum hydroxide (B2) and mixtures thereof, (C) organohydrogenpolysiloxanes, (D) organosilcon compound having a vinyl radical, epoxy group, acroyloyloxy or methacryloyloxy group and hydrolyzable groups and (E) hydrosilylation catalyst or peroxide crosslinking agent, the Mooney viscosity of the silicone compositions, determined at 25° C. according to DIN 53523 Part 3, being 20 to 200.
摘要:
In a process, according to the invention hydridic silanes such as H.sub.2 SiCl.sub.2 or SiH.sub.4 and oligomeric hydridic silanes containing up to 5 silicon atoms are admixed with a hydrocarbon stabilizer. The hydrocarbon may have functional groups selected from among carboxylic ester, aldehyde, keto, ether, thioether, tertiary amino, epoxy and cyano groups and halogen atoms.
摘要:
Di- and trialkylsilanes of the formulaR.sub.a R.sup.1 R.sup.2.sub.b SiX.sub.c (I),which comprises reacting mono- and dialkylsilanes of the formulaR.sup.1 R.sup.2.sub.b SiH.sub.a X.sub.c (II),with alkenes A having at least 4 carbon atoms, which alkenes are unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups, in the presence of a transition metal catalyst and a hydrocarbon as activator, which hydrocarbon has at least one functional group selected from among aldehyde, keto and epoxy groups or halogen atoms, where in the above formulae (I) and (II),R is a branched or cyclic hydrocarbon radical having at least 4 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups,R.sup.1 is an alkyl radical having at least 2 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups,R.sup.2 is a hydrocarbon radical having at least 2 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine, or bromine atoms or cyano groups,X is a fluorine, chlorine or bromine atom or an alkoxy radical having from 1 to 18 carbon atoms, which radical is unsubstituted or substituted by fluorine, chlorine or bromine atoms or cyano groups,a is 1 or 2,b is 0 or 1 andc is 1 or 2.
摘要翻译:包括式R 1 R 1 R 2 b Si X c(I)的二 - 和三烷基硅烷,其包括使式R 1 R 2 b SiHa X c(II)的单烷氧基硅烷和二烷基硅烷与具有至少4个碳原子的烯烃A反应,该烯烃是未取代的或被氟,氯或溴原子或氰基 在过渡金属催化剂和烃作为活化剂的存在下,该烃具有至少一个选自醛,酮和环氧基或卤素原子的官能团,其中在上式(I)和(II)中, R是具有至少4个碳原子的支链或环状烃基,该基团是未取代的或被氟,氯或溴原子或氰基取代,R 1是具有至少2个碳原子的烷基,该基团是未取代或取代的 通过氟,氯或溴原子或氰基,R 2是具有至少2个碳原子的烃基,该基团是未取代的或被氟,氯或溴取代 原子或氰基,X是氟,氯或溴原子或具有1至18个碳原子的烷氧基,该基团是未取代的或被氟,氯或溴原子或氰基取代的基团,a是1或2, b为0或1,c为1或2。
摘要:
A process for the continuous production of organopolysiloxane compositions which vulcanize at elevated temperature and have a viscosity of at least 500 Pa·s at 25° C., involves mixing and homogenizing high-viscosity organopolysiloxanes and crosslinking additives in a kneading cascade having at least two kneading chambers arranged in series proximate one another, containing two axially parallel kneading tools which can be driven in the same or opposite directions, and which are connected to one another by means of openings transverse to the axes of the kneading tools, with the first kneading chamber having a feed opening and the last kneading chamber having a discharge opening, and the temperature in the kneading chambers containing crosslinking additives being not more than 95° C.
摘要:
A process for the preparation of di- and trialkylsilanes of the general formula (I) RaR1bSiXc (I), in which mono- or dialkylsilanes of the general formula (II) R1bSiHaXc (II) are reacted with alkenes A which have at least 3 carbon atoms and are optionally substituted by fluorine, chlorine or bromine atoms or cyano groups, in the presence of a transition metal catalyst and a trihalogenosilane of the general formula (III) R2SiY3 (III) as an activator, wherein, in the above general formulae (I) to (III), R is a branched or cyclic hydrocarbon radical having at least 3 carbon atoms, optionally substituted by fluorine, chlorine, or bromine, or cyano groups, R1 is an alkyl radical optionally substituted by fluorine, chlorine, or bromine, or cyano groups, R2 is a hydrogen atom, or an alkyl radical optionally substituted by fluorine, chlorine, or bromine, or cyano groups, X is fluorine, chlorine, or bromine, or an alkoxy radical having 1 to 18 carbon atoms optionally substituted by fluorine, chlorine, or bromine, or cyano groups, Y is fluorine, chlorine or bromine, a is 1 or 2, b is 1 or 2, and c is 1 or 2.