Abstract: Organofunctional silanes are prepared in high yield by electrochemically reacting a silane bearing a halo or alkoxy group with a hydrocarbon bearing a halo or alkoxy group in an undivided electrolysis cell with no or minimal complexing agent present.

Abstract: The invention relates to a method for the production of hydroxyalkyl polysiloxanes of general formula (V) (SiO4/2)k(R12SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q[O1/2SiR32—(CR42)b—OH]5[O1/2H]t (V), wherein organosiloxanes of general formula (VI) (SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q[O1/2H]r(VI) containing silanol are made to react with compounds having at least one unit of general formula (IV) [O—(CR42)b—SiR32]n—(IV).

Abstract: The invention relates to a method for producing isocyanato-organosilane of general formula (I) R2R3R4Si—R1—N═C═O. According to said method, gaseous carbamato-organosilane of general formula (II) R2R3R4Si—R1—NH—CO—OR (II), wherein R represents a monovalent C1-C10 alkyl radical, R1 represents a bivalent C1-C6 hydrocarbon radical and R2, R3 and R4 respectively represent a methyl, ethyl, n-propyl, i-propyl, methoxy, ethoxy, n-propoxy or i-propoxy radical, is heated in the presence of a heterogeneous catalyst.

Abstract: The invention relates to a method for the production of hydroxyalkyl polysiloxanes of general formula (V) (SiO4/2)k(R12SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q[O1/2SiR3213 (CR42)b—OH]s[O1/2H]t (V), wherein organosiloxanes of general formula (VI) (SiO4/2)k(R1SiO3/2)m(R12SiO2/2)p(R13SiO1/2)q[O1/2H]r(VI) containing silanol are made to react with compounds having at least one unit of general formula (IV) [O—(CR42)—SiR32]n— (IV).

Abstract: The invention relates to a method for producing isocyanato-organosilane of general formula (I) R2R3R4Si—R1—N═C═O. According to said method, gaseous carbamato-organosilane of general formula (II) R2R3R4Si—R1—NH—CO—OR (II), wherein R represents a monovatlent C1-C10 alkyl radical, R1 represents a bivalent C1-C6 hydrocarbon radical and R2, R3 and R4 respectively represent a methyl, ethyl, n-propyl, i-propyl, methoxy, ethoxy, n-propoxy or i-propoxy radical, is heated in the presence of a heterogeneous catalyst.

Abstract: The invention relates to a one-step process for the preparation of acryloyl group-containing liquid-crystalline monomers of the general formula (1) (Z—Y1—A2—Y2—)mM(—O—A1-acrylate)n  (1) in which mesogenic alcohols of the general formula (2) (Z—Y1—A2—Y2—)mM(OH)n  (2) are reacted with esters of 3-chloropropionic acid of the general formula (3) ClPr—A1—X  (3) with elimination of HCl, where acrylate is an acrylate radical, ClPr is a 3-chloropropionate radical, A1 are identical or different alkyl chain spacers having 2-20 carbon atoms, in which the carbon chain may be interrupted by non-adjacent ether, thioether, or imino groups, A2 are radicals A1 or single chemical bonds, M is a mesogenic group, X is a leaving group, Z are alkyl radicals or crosslinkable groups, Y1 and Y2, independently of one another, are a single chemical bond, —O—, —S—, —O—CO—, —CO

Abstract: An optically anisotropic film obtained from a mixture comprising a polymer and a liquid crystal compound, wherein retardation of the optically anisotropic film at 80° C., 60° C. or 0° C. measured from a normal direction is 20-97%, 20-99% or 101-150%, respectively, of retardation at 30° C., and an absolute value of a deviation in retardation by said liquid crystal compound is not greater than 6% when the optically anisotropic film is held at 30% for 200 hours, has the temperature dependence in accordance with the temperature dependence of retardation of a liquid crystal display cell, and a small variation of retardation by the liquid crystal compound with the lapse of time, and thus is suitable for use in a liquid crystal display apparatus.