Abstract: The invention provides a process for water-proofing gypsum materials which comprises adding, to a pulverulent gypsum plaster composition containing from 10 to 90% by weight of gypsum based on the total weight of the composition, a mixture ofa) from 1.0 to 15% by weight, based on the total weight of the composition, of one or more dispersion powders redispersible in water and based on vinyl acetate copolymers with ethylene and/or vinyl esters of C.sub.5 -C.sub.15 -monocarboxylic acids, styrene copolymers with acrylic esters of alcohols having from 1 to 18 carbon atoms, vinyl chloride copolymers with ethylene and/or vinyl esters of C.sub.2 -C.sub.15 monocarboxylic acids, andb) from 0.05 to 5.0% by weight, based on the total weight of the composition, of one or more thixotropic additives from the group consisting of polyacrylic acids and their salts, smectites, bentonites, carboxymethylcelluloses and melamine-formaldehyde condensates.

Abstract: The present invention relates to crosslinkable compositions are described, containing(1) organosilicon compounds which have radicals containing aliphatic carbon-carbon multiple bonds, and(2) organosilicon compounds having Si-bonded hydrogen atoms, or(3) organosilicon compounds where radicals with aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms are present in the same compound,(4) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic multiple bond, and(5) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperature, of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.4, R.sup.5 and R.sup.6 are identical or different and are a hydrogen atom or a monovalent, substituted or unsubstituted hydrocarbon radical having 1 to 12 carbon atoms per radical,R.sup.

Abstract: Aqueous emulsions comprising(1) an organopolysiloxane with SiC-attached vinyl groups in the terminal units,(2) an organopolysiloxane with at least 3 Si-attached hydrogen atoms,(3) a catalyst promoting the addition of Si-attached hydrogen to aliphatic multiple bonds,(4) an organosilicon adhesion promoter,(5) a silicone resin,(6) an emulsifier and(7) water.

Abstract: 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.

Abstract: Organosilicon compounds containing furanyl groups which contain units of the formula ##EQU1## in which R is identical or different and is a hydrogen atom or monovalent, SiC-bonded, aliphatically saturated, optionally substituted hydrocarbon radical, which can be interrupted by oxygen atoms,R.sup.1 is identical or different and is an optionally substituted hydrocarbon radical having 1 to 8 carbon atoms, which can be interrupted by 1 to 3 oxygen atoms.A is identical or different and is an SiC-bonded furanyl radical of the formula ##STR1## where R.sup.2 has the meaning given above for the radical R and R.sup.3 is a divalent hydrocarbon radical having 2 to 30 carbon atoms, which can contain one or more groups, chosen from the group consisting of ##STR2## a is 0, 1, 2 or 3, b is 0, 1 or 2 andc is 0, 1 or 2,with the proviso that the sum a+b+c is less than or equal to 3 and the organosilicon compound contains at least one radical A per molecule.

Abstract: The present invention provides crosslinkable compositions comprising(A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds,(B) an organosilicon compound having Si-bonded hydrogen atoms,(C) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bond, and optionally(D) an agent which retards the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperatureand to the use of the crosslinkable compositions for producing coatings which repel tacky substances.The present invention also relates to organosilicon compounds having Si-bonded hydrogen atoms, and to a process for their preparation.

Abstract: The invention relates to a process for the silylation of very finely divided inorganic oxides, in which the very finely divided inorganic oxides are treated with at least one silylating agent which is relatively nonvolatile in the temperature range of the overall process, with the proviso that the relatively nonvolatile silylating agent is admixed with the very finely divided inorganic oxides as a liquid, in the form of a very finely atomized aerosol. Furthermore, the invention relates to a highly apolar, pyrogenic silica prepared by this process.

Abstract: A process for the production of a microporous body having heat insulation properties by(a) mixing of(I) 0.5%-60% by weight of at least one compound selected from the group consisting of magnesium carbonate/calcium carbonate, and magnesium carbonate/calcium hydroxide(II) 5%-95% by weight of highly dispersed SiO.sub.2 with a content of 0%-20% by weight of Al.sub.2 O.sub.3 (based on the SiO.sub.2 employed);(III) 0%-60% by weight of an opacifying agent having at least one absorption maximum in the wavelength range of 1.5-10 .mu.m; and(IV) 0.1%-10% by weight of an organic fiber selected from the group consisting of cellulose fibers and carbon fibers;(b) compressing the mixture prepared to form a shaped article; and(c) heating the shaped article under oxidizing conditions produced at a temperature between 750.degree. C. to 950.degree. C. to oxidize the organic fibers and to produce the microporous body.

Abstract: In the process, used sulfuric acid which contains, as minor constituents, methylsulfuric acid, dimethyl ether, methanol, aliphatic and olefinic hydrocarbons, chlorinated hydrocarbons and oligomeric siloxanes, in a first step;(1) used sulfuric acid is diluted by introducing steam and optionally by adding liquid water to a concentration of at most 55% by weight sulfuric acid and is heated to boiling at a maximum of 135.degree. C. and in a second step;(2) the sulfuric acid from the first step is reacted with an oxidizing agent at a temperature of from 20.degree. C. to 130.degree. C.

Abstract: A method for the multiple filling and emptying of a receptacle with pourable product having low bulk density. The method comprises the following features:a) providing a flexible and air-permeable fabric container with at least one access port as a receptacle;b) filling the fabric container with product by applying a negative pressure to the fabric container and sucking the product through an opened access port into the fabric container, until a predetermined filling weight is reached, and closing the access port;c) emptying the fabric container, by connecting an access port to a discharge device and opening the access port and sucking the product into a conduit system or a reservoir until the fabric container is evacuated and has folded up; andd) closing the access port.

Abstract: Coating compositions based on water-redispersible powders comprising water-soluble polymer and organosilicon compounds, wherein the organosilicon compounds comprise at least one low molecular weight organosilicon compound having a viscosity of not more than 5,000 mm.sup.2 /s at 25.degree. C. and at least one high molecular weight organopolysiloxane resin which has a viscosity of at least 100,000 mm.sup.2 /s at 25.degree. C. or is solid at room temperature.

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 whichR 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 andm 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: The invention relates to a process for preparing organosilanes which contain at least one Si-bonded hydrogen in the presence of a phosphonium catalyst, the phosphonium catalyst itself and also a process for its preparation.

Abstract: This invention covers the use of cross-linkable redispersible dispersion powders based on vinyl ester copolymers or (meth)acrylic acid ester copolymers as binders for the dry binding of fibre materials.

Abstract: 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.

Abstract: The present invention relates to organopolysiloxane-containing compositions which are self-dispersing in water, their preparation and their use. The compositions of the present invention are suitable for all uses where organosilicon compounds, especially in water-diluted form, can be employed. Such uses include uses as water repellant agents on building materials.

Abstract: The invention relates to organopolysiloxane compositions that when crosslinked form electroconductive elastomers. The elastomers are formed via an addition crosslinking method and contain 11% to 30% by weight with respect to the total composition of carbon fibers having a 0.1 to 10 mm average length. The compositions are suitable for producing injection molded articles.

Abstract: The invention relates to a process for the preparation of microencapsulated flakes or powders by drying aqueous mixtures containing (a) one or more water-emulsifiable, non-thermoplastic compounds which have a higher boiling point than water and (b) at least one water-soluble, film-forming polymer, in which the content of component (a) is up to about 95% by weight, based on the dry weight of components (a) and (b), with the proviso that the water-soluble, film-forming polymer has a flocculation point of from 20.degree. to 98.degree. C. or the flocculation point is adjusted to from 20.degree. to 98.degree. C. with the aid of additives, and drying is carried out by thin-layer drying in a temperature range above the flocculation point.

Abstract: In the process of the present invention, crude oil is extracted from crude oil-containing deposits with the aid of an emulsion containing the components(A) 100 parts by weight of organopolysiloxane(B) 10 to 100 parts by weight of surfactant and(C) water.

Abstract: Water-repellent plaster compositions comprising the constituents(A) 100 parts by weight of gypsum plaster,(B) from 0.05 to 50 parts by weight of oxide or hydroxide of alkali or alkaline earth metals or a mixture thereof, and(C) from 0.05 to 20 parts by weight of an organopolysiloxane which has hydroxyl and/or alkoxy groups bonded to silicon atoms.