Abstract: A method for the extraction of organic pollutants from contaminated soils without further contaminating the soil with organic solvents comprises the step of mixing aqueous solutions of cyclodextrins or their derivatives with the contaminated soil.

Abstract: The present invention relates to oxygen-containing chlorophosphazenes containing organosilicon radicals, in particular those of the formulaZ-PCl.sub.2 =N(-PCl.sub.2 =N).sub.n -PCl.sub.2 O (I)in whichZ is an organosilicon radical bonded to phosphorus via oxygen andn is from 0 to 6, processes for their preparation and their use in processes for the condensation and/or equilibration of organosilicon compounds.

Abstract: Disclosed are organopolysiloxane preparations containing: A) units of the formula (I): (R.sup.1 O).sub.a SiHR.sup.2.sub.2-a O1/2, in which R.sup.1 and R.sup.2, which may be the same or different, are each, independently of each other, an optionally substituted monovalent hydrocarbon group and a is 1 or 2, B) siloxane units which can be cross-linked by irradiating and, optionally, C) siloxane units acting as photo-initiators. These preparations are useful for the production of coatings.

Abstract: In the method for coating substrate surfaces which are not water-absorbent, the substrate surfaces are coated with an aqueous composition which comprises an aqueous solution, dispersion and/or emulsion of film-forming substances and water-repellent substances, in which the coating can be removed by treatment with water. The method is also suitable for coating porous, water-absorbent substrates if the substrates are treated with a water-repellent prior to coating with the aqueous composition.

Abstract: Sealing compositions containing dispersions of polymers of ethylenically unsaturated monomers comprising(a) polymers of ethylenically unsaturated monomers,(b) 0.1 to 5% by weight of branched organopolysiloxanes, based on the total weight of the sealing compositions,(c) dispersing agent,(d) filler and(e) water.

Abstract: The invention relates to pollutant-resistant compositions containing organopolysiloxanes. They are used for producing impermeable walls and similar ground seals introduced into the earth. This pollutant-resistant organopolysiloxane-containing composition comprises(A) a salt of organic or inorganic acid and organopolysiloxane which has SiC-attached radicals containing basic nitrogen in amounts of at least 0.5% by weight of basic nitrogen, based on the weight of this organopolysiloxane,(B) organosilicon compound containing basic nitrogen in amounts of from 0 to 0.5% by weight, based on the weight of this organosilicon compound,(C) swellable clay minerals and(D) hydraulic binder.

Abstract: Process for the preparation of an organopolysiloxane resin, which comprisesin a first stage reacting at least one silane of the formulaR.sub.a Si(OR.sup.1).sub.4-a (I)in which a has a value of 0, 1, 2 or 3, R and R.sup.1 are monovalent organic radicals which may be the same or different and/or a partial hydrolyzate thereof, with the proviso that at least one silane of formula (I), where a is 0 or 1 and/or a partial hydrolyzate thereof is employed, and optionally an organo(poly)siloxane with water in the presence of a poly-protic acid and optionally other substances, subsequently partly neutralizing the acid by addition of a base and then distilling off at least some of the compound R.sup.1 OH formed,in a second stage reacting the homogeneous reaction mass resulting from the first stage in the presence of a base and a water-insoluble organic solvent and distilling off the water and the compound R.sup.

Abstract: A crosslinkable composition comprising (A) an organopolysiloxane which has at least one monovalent SiC-bonded radical containing primary and/or secondary amino groups, and (B) a crosslinking component selected from an alkoxysilane and/or siloxane which contains at least one carboxylic acid anhydride group. The crosslinkable composition and/or the resultant organopolysiloxane compound obtained from the reaction of organopolysiloxane (A) and crosslinking component (B) can be used to treat organic fibers and textile structures produced therefrom.

Abstract: Compositions for the impregnation of mineral building materials, which comprise(A) salts of organic or inorganic acids and an organopolysiloxane siloxane or mixture of organopolysiloxanes containing SiC-bonded radicals containing basic nitrogen, in amounts of at least 0.5% by weight, based on the weight of the organopolysiloxane, optionally(B) an organosilicon compound containing basic nitrogen, in amounts of 0 to 0.5% by weight, based on the weight of the organosilicon compound, and(C) a fluorine-containing organic or organosilicon compound.

Abstract: The invention relates to the preparation of a graft copolymer latex of core/shell dispersion particles having improved phase binding between core and shell in a two-stage emulsion polymerization process, hydroperoxide groups being produced at the particle surface of the grafting base prior to grafting by hydrogen peroxide treatment.

Abstract: The stabilized organopolysiloxanes which comprise thiodiglycolic esters of the formula ##STR1## in which R.sup.1 can be identical or different monovalent, unsubstituted or halogen-substituted C.sub.1 -C.sub.18 -hydrocarbon radicals,x and y, independently of one another, are each integers from 1 to 10 andn is an integer from 1 to 5.The stabilized organopolysiloxane oils are suitable for use as heat and power transfer media.

Abstract: The present invention relates to siloxane copolymers containing alkenyl groups and a process for their preparation. The siloxane copolymers of the present invention can be used in cross-linkable compositions for the production of coatings which repel tacky substances, an example of which would include coatings for release papers or films.

Abstract: Graft copolymers having improved phase binding between the graft base and the grafted-on polymer, are prepared from:a) a grafted-on polymer phase containing one or more monomers from the group consisting of (meth)acrylates of alcohols having 1 to 10 carbon atoms, vinyl esters of saturated aliphatic carboxylic acids having 2 to 10 carbon atoms, olefins, vinyl halides, styrene and styrene derivatives, andb) a peroxy group-containing copolymer phase containing from 0.01 to 20% by weight of an olefinically unsaturated peroxy compound of the general formula I or II ##STR1## where R.sup.1 is a chemical bond or a linear or branched alkyl chain having 1 to 10 carbon atoms or a cycloalkyl group having 3 to 10 carbon atoms, R.sup.2 and R.sup.3 are an alkyl group having 1 to 4 carbon atoms, R.sup.4 is an alkyl group or an alkyl-substituted phenyl group having 3 to 12 carbon atoms, and R.sup.5 is a cycloalkyl group having 3 to 12 carbon atoms, and from 80 to 99.

Abstract: A process for the condensation and/or equilibration of organosilicon compounds in the presence of oxygen-containing phosphazenes, in particular those of the formulaY--PCl.sub.2 .dbd.N(--PCl.sub.2 .dbd.N).sub.n --PCl.sub.2 O(I),in whichY represents a chlorine atom or the hydroxyl group andn represents 0 or an integer from 1 to 8, and/or condensation products thereof.

Abstract: The invention relates to a process for continuously hydrophobicizing pyrogenic, finely divided silica, in which the waste gases are fed back to a mixing chamber upstream of the SiO.sub.2 reaction flame.

Abstract: The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous reaction of the resulting distillation residue with acetic acid, pure diketene and acetic anhydride being separated off by means of the two-stage distillation. In the stabilization of the distillation residue with acetic acid, reutilizable acetic acid, which contains acetone with or without acetic anhydride, is recovered.

Abstract: The present invention provides compositions which are based on diorganopolysiloxanes that crosslink to give elastomers containing no toxic curing catalysts, e.g., tin catalysts. These elastomers have a high tensile strength and are suitable for use as coatings.

Abstract: A process for preparing an organopolysiloxane resin, which comprises reacting in a first stage at least one silane of the formulaR.sub.a Si(OR.sup.1).sub.4-a (I)in which a is 0, 1, 2 or 3, R is a monovalent organic radical, and/or a partial hydrolyzate thereof, with the proviso that at least one silane of formula (I) in which a is equal to 0 or 1, and/or a partial hydrolyzate thereof, is employed, and, if appropriate, an organo(poly) siloxane with water in the presence of acid and, if appropriate, other substances, in a second stage reacting the reaction mixture obtained from the first stage in the presence of base and, if appropriate, other substances, and in a third stage adding with stirring, the reaction mixture obtained in the second stage into water, and if appropriate mixed with additives.

Abstract: In the process, a copper/rhodium catalyst impregnated with 0.1 to 10.0% by weight, based on the total weight of active charcoal catalyst support and active components, of a water-soluble phosphonium halide is employed for the preparation of trichloroelethylene from perchloroethylene and hydrogen.

Abstract: A laminating and coating adhesive based on an aqueous dispersion of(1) a copolymer of a vinyl ester, and/or an acrylic acid ester, and/or a further monomer and an ethylenically-unsaturated functional group-containing monomer having from 3 to 18 carbon atoms and hydroxy and carbonyl groups as functional groups, such as a monocarboxylic acid or dicarboxylic acid and/or N-methylol-(meth)-acrylamide,(2) an epoxy compound, and(3) an amine hardener.The adhesive gives a laminate bond with especially high resistance to peeling even in the case of thermal stress and/or in the presence of water.