Abstract: The invention provides a method of increasing the elasticity of moisture-cured elastomers, which comprises adding to alkoxy-cross linking one-component compositions comprising an alkoxysilane-terminated polymer (A) containing end groups of the formula (1) -A-Si(R)a(CH3)3-a??(1) a silane (B), of the general formula (2) X—CH2—Si(R)2(CH3)??(2) where A is a divalent hydrocarbon radical, R is a methoxy or ethoxy group, X is a group R?O—, R?NH—, R?—O—CO—NH, R?—NH—CO—NH— or halogen, R? is hydrogen, an optionally halogen-substituted C1-18 hydrocarbon radical or a radical R?—O—CO— or R?—NH—CO, R? is an optionally halogen-substituted C1-8 hydrocarbon radical, and a is 1, 2 or 3.

Abstract: Crosslinkable compositions prepared from (A) organopolysiloxanes containing alkenyl groups, of the general formula MVia Tb Dc DVid Me ??(I) where Mvi is a unit of the formula R1R2SiO1/2, T is a unit of the formula RSiO3/2, D is a unit of the formula R2SiO, Dvi is a unit of the formula R1RSiO, and M is a unit of the formula R3SiO1/2, R are monovalent, SiC-bonded, optionally substituted C1-18 hydrocarbon radicals free from aliphatic unsaturation, and R1 are monovalent, SiC-bonded C2-8 hydrocarbon radicals having a terminal aliphatic carbon-carbon double bond, a is on average 2.5 to 8, b is on average a-2, c is on average 41 to 1000, d is on average 0 to 4, and e is on average 0 to 2, with the proviso that a-2 Mvi units are attached directly to T units, (B) organosilicon compounds having Si-bonded hydrogen atoms, and (C) catalysts which promote the addition of Si-bonded hydrogen to aliphatic double bonds, have exceptional utility as abhesive coatings.

Abstract: A composition preparable using polymer components (1) (A1) polyorganosiloxanes comprising T and optionally M units and/or (A2) polyorganosiloxanes comprising Q and optionally M units, with the proviso that per molecule there are 0.01% to 3.0% by weight of Si-bonded radicals OR1, and also, optionally, one or more vinyl chloride-hydroxypropyl acrylate copolymers, vinyl acetate-ethylene copolymers, polyvinyl chloride, polyamides, polyesters, acrylate-polyester copolymers, polyamide-polyester copolymers, vinyl acetate-polyester copolymers, or monomeric (meth)acrylates, the (meth)acrylates copolymerized with silanes containing Si-bonded (meth)acrylate groups, (2) silane(s) R3xSi(OR2)4-x, and (3) crosslinked silicone particles composed of a single molecule which have an average diameter of 5 to 200 nm, are useful for forming coatings which bond well to substrates, exhibit low friction, and are dirt repellant.

Abstract: The invention relates to silicone rubber compositions which contain inorganic filler which is selected from metal oxides and silicon oxides and silicon-metal mixed oxides, and milled mineral fibers.

Abstract: Oil-in-water emulsions which contain (i) 100 parts by weight of a polydimethylsiloxane (P) having aminoalkyl groups and having an amine number of at least 0.1 meq/g of polydimethylsiloxane (P), composed of units of the general formula I R1aR2bSiO(4-a-b/2)??(I), in which R2 are aminoalkyl radials of the formula II —R3—NR4R5,??(II), (ii) protonating agent, (iii) water and (iv) not more than 5 parts by weight of emulsifier, are stable and provide for improved water repellency of porous and nonporous, absorptive and non-absorptive substrates treated therewith.

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: The invention relates to a process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the general formulae 1 and/or 2 RSi???(1), ?Si???(2), at least one unit of the general formula 3 R2Si???(3), and optionally units of the general formula 4 R3Si—??(4) in which silane(s) of the general formulae 1a and 2a RSiX3??(1a), SiX4??(2a), and 3a R2SiX2??(3a), and optionally silane of the general formula 4a R3SiX??(4a), where R is hydrocarbyl and X is halo, are reacted with elemental metal, the addition of the reactants being such that the silane of the general formula 3a in the reaction with elemental metal contains at most 2 mol % of silane which is selected from silanes of the general formulae 1a and 2a, and to the organopolysilanes obtainable by the process.

Abstract: Compositions comprising (A) an organosilicon compound of the formula Ra(R1O)bR2cSiO(4-a-b-c)/2 ??(I) in which R2 independently denotes a monovalent, SiC-bonded, optionally substituted, aliphatic cyclic or aliphatic branched hydrocarbon radical having at least 3 carbon atoms, R, and R1 are hydrogen or hydrocarbon radicals, the sum a+b+c?3, the organosilicon compound has at least one unit of the formula (I) with c other than 0, and in at least 50% of all of the units of the formula (I) in the organosilicon compound the sum a+b+c is 2; at least one additive (B) selected from (B1) filler particles and/or (B2) organopolysiloxane resin(s) and optionally (C) an organosilicon compound which has units of the formula (III), R5g(R6O)hSiO(4-g-h)/2 where R5 and R6 are hydrogen or a hydrocarbon radical, g+h?3 and in at least 50% of the units (III), g+h=2, are highly effective and long lasting defoamers.

Abstract: The invention relates to a paper composite material with repulp-resistant adhesive coating, consisting of a paper carrier and an adhesive layer, characterized in that an intermediate coat of a dispersion polymer film containing a protective colloid and/or an emulsifying agent and with a glass transition temperature Tg of ?20° to 40° is applied between the paper carrier and the adhesive coating. The invention also relates to a method for the production of paper composite material with repulp-resistant adhesive coating.

Abstract: One component vulcanizable silicone elastomer compositions contain at least one organosilicon compound bearing a plurality of hydrolyzable groups, optionally one or more crosslinkers bearing hydrolyzable groups, and a catalyst system comprising a tin compound bearing a sulphonic acid, sulfonic acid amide, or sulfonic acid ester group, and a basic nitrogen compound. Storage stable compositions capable of vulcanizing to clear or translucent moldings are produced.

Abstract: Organosilicon compounds containing isocyanate groups and composed of units (Ia) Ra(R1O)bXcSiO(4-a-b-c)/2, ??(Ia) are prepared by heating organosilicon compounds composed of units (Ib) Ra(R1O)bYcSiO(4-a-b-c)/2, ??(Ib) where X is an SiC- or SiOC-bonded radical of the formula (IIa) —(O)g—Z—NCO, ??(IIa) Y is an SiC- or SiOC-bonded radical of the formula (IIb) —(O)g—Z—NH—C(O)OR2 (IIb), g is 0 or 1, Z is a hydrocarbon spacer, R, R1 and R2 are optionally substituted hydrocarbon radicals, with the proviso that the organosilicon compounds of formula (Ib) possess a halide content of not more than 10,000 ppm by weight.

Abstract: Hydrophilic siloxane copolymers are prepared by (a) reacting organopolysiloxanes having at least one Si-bonded hydrogen atom with substantially linear oligomeric or polymeric compounds of formula R1-(A-CnH2n)m-A1-H??(I) where R1 is a monovalent optionally substituted, hydrosilylatable hydrocarbyl radical, A is a bivalent polar organic radical selected from —O—, —C(O)—O—, —O—C(O)—, —O—C(O)—O—, —C(O)—NH—, —NH—C(O)—, urethane radicals and urea radicals, A1 is a bivalent polar organic radical selected from —O—, —NH— and —NR?—, n is an integer from 1 to 20, and m is zero or a positive integer, (b) reacting the resulting intermediate with organic compounds which have two or more isocyanate groups, in the presence of further organic compounds (6) reactive toward isocyanate groups and containing at least one tertiary amine group, and (c) quaternizing the amino-group-containing intermediate from step (b) with an alkylating agent (8), with the proviso that the water content of the compounds (1) and (2) is lower than

Abstract: Cable components of silicone elastomer contain glass fibers having an average length of at least 1 m. The cable components retain substantial strength when exposed to heat or fire.

Abstract: The invention provides a process for preparing linear organopolysiloxanes (P) having diorganosiloxy units and Si—H groups, in which, in a first step, diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of the monochlorosilanes (B) or dichlorosilanes (C) containing Si—H groups, are reacted with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, the SiCl groups still present in the partial hydrolyzate (T) are removed by treating with water to form hydrochloric acid, and a hydrolyzate (H) containing the organopolysiloxanes (P) is obtained.

Abstract: Antimisting additives are used in crosslinkable silicone coating compositions for reducing aerosol formation, the antimisting additives being alkenyl-functional siloxane copolymers prepared by reacting a hydrocarbon containing at least three aliphatic double bonds, and with an organosiloxane (2) having terminal Si-bonded hydrogen atoms in the presence of a hydrosilylation catalyst (3) at a ratio of Si-bonded hydrogen to aliphatic double bonds of from 1.3 to 10, and subsequently reacting the resulting SiH-containing hydrocarbon-siloxane copolymer with an ?,?-dialkenylsiloxane polymer (4) in the presence of a hydrosilylation catalyst (3) at a ratio of aliphatic double bonds to Si-bonded hydrogen of from 1.2 to 10, and optionally, in another step, equilibrating the resulting alkenyl-functional siloxane copolymers with an organopolysiloxane (5).

Abstract: A process for preparing trichloromonosilane, in which silicon particles are reacted with hydrogen chloride in a fluidized bed reactor, wherein the silicon particles used are a silicon dust which is obtained as a waste product in the preparation of defined silicon particle size fractions from lump-form silicon and the silicon dust is introduced directly into the reactor.

Abstract: Storage stability of one-component elastomers prepared from constituents having alkoxysilyl end groups is enhanced by employing bin compounds having a coordination number of 5 or 6 in which tin is coordinately bonded to a P?O group as at least one condensation catalyst.

Abstract: The invention relates to crosslinkable compositions based on organosilicon compounds and having controllable modulus, to a process for their preparation and to their use, said compositions comprising (a) polymers of the formula XnR3-nSi-A-SiR2—(CH2)3NHY??(I) (b) polymers of the structure X1kR53-kSi-A1-SiX1kR53-k??(II) (c) optionally, silanes of the formula R6mSiX24-m??(III) and/or partial hydrolyzates thereof, and (d) optionally, silanes of the formula R4oSiR7pX34-o-p??(IV) and/or partial hydrolyzates thereof, where X, X1 and X3 are OH or a hydrolyzable group, R, R4, R5, and R7 are hydrocarbyl groups, and A is a divalent linking group.

Abstract: The invention relates to compositions based on organosilicon compounds, crosslinkable by condensation reaction, and having controllable modulus, to their preparation and to their use as sealants. The compositions contain as crosslinker(s) at least one organosiloxane containing units of the formula RdXeSiO(4-d-e)/2 ??(I) where R is preferably a hydrocarbon group and X is a hydrolyzable group, d and e are 0 or small whole numbers, with the proviso that the sum of d+e is ?3, from 3 to 15 units of the formula (I) are present per molecule, at least two X radicals are present per molecule and at least one unit of the formula (I) where d=2 and e=0 is present per molecule.

Abstract: A process for preparing amino-functional organopolysiloxanes comprising (i) mixing aminosilanes of the general formula RaQbSi(OR1)4?(a+b), where R and R1 are hydrogen or optionally substituted hydrocarbyl, a is 0, 1 or 2, b is 1, 2 or 3, and a+b is ?3, Q is —R5—[NR6(CH2)n]eN(R6)2, where R5 is a hydrocarbyl diradical and R6 is hydrogen, hydrocarbyl, or acyl, e is 0, 1, 2, 3 or 4, n is 2, 3, 4, 5 or 6, with organosilicon compounds selected from siloxanes comprising units R d ? ( O ? R 1 ) f ? SiO 4 - ( d + f ) 2 ? ? ? and ? ? ? R c ? SiO 4 - c 2 or silanes RcSi(OR1)4?c, where c is 0, 1, 2 or 3, d is 0, 1 or 2, f is 1, 2 or 3, with the proviso that d+f is ?3, basic catalysts selected from alkali metal hydroxides, alcoholates and siloxanolates, and optionally, alcohols H—[O(CHR2)p]mOR3, where R2 and R3 are hydrogen or hydrocarbyl, p is 2, 3 or 4, and m is 0 or an integer from 1 to 100, (ii) reacting by heating to 70-100° C.