Th. Goldschmidt Ag

Gerd Rossmy

Gotz Koerner

Hans-Joachim Kollmeier

Hans-Ferdi Fink

Burghard Gruning

Rolf-Dieter Langenhagen

Ulrich Holtschmidt

Peter Zaske

Christian Weitemeyer

Helmut Lammerting

Gunter Schmidt

Otto Klocker

Hermann Hoffmann

Herwig Fritsch

Goetz Koerner

Werner Lidy

Gert Kunzel

Koerner, Gotz

Dieter Borner

Heinz Theile

Silicic acid or silica particles having initially surface-located hydroxyl groups are modified by replacing at least partially the hydroxyl groups by an organic group to impart the particles with emulsion-breaking and foam-destroying properties. Processes for preparing the modified particles are also disclosed.

Silica or silicic acid particles whose surface located hydroxyl groups

Particles less than 100 .mu.m in size and modified by hydrophilic and hydrophobic groups wherein the hydrophilic and hydrophobic groups are distributed anisotropically on the surface of the modified particles. Processes for the preparation of such particles and the use of such particles as surface active products, especially for stabilizing or destablizing emulsions and foams as well as for tertiary oil recovery.

Particles, modified at their surface by hydrophilic and hydrophobic

An aqueous composition for coating substrates which contains polymeric organic film formers containing a deaerating effective amount of a linear polymer having at least five side groups, each of which contains a silicon atom which is linked by way of a divalent hydrocarbon group to the polymer, each silicon atom carrying at least one R.sup.1 group of formula

Material for deaerating coating systems

A method for easily degrading wastes consisting of the reaction products of organic materials containing isocyanate groups and specifically foamed polyurethane wastes by comminuting the waste and reacting it with alkylene oxide at 120.degree. C. to 200.degree. C. and removing the unreacted alkylene oxide. The products obtained are homogeneous liquids which can be added to polyols for reaction with isocyanates to form foamed polyurethanes.

Process for easily degrading waste consisting of the reaction products

In the disclosed process of producing resilient open-celled, cross-linked polyurethane foams, by foaming polyol, polyisocyanate, catalyst and blowing agent, the foaming is effected in the presence of a cross-linker which is a saturated or unsaturated, aliphatic, cycloaliphatic, heteroaliphatic or arylaliphatic crystalline polyhydroxy compound having at least 3 hydroxy groups. The crystalline polyhydroxy compound is insoluble or only slightly soluble in the polyol to be foamed and melts within the temperature range of about 60.degree.-160.degree. C. The amount of crystalline polyhydroxy compound to be used corresponds to about 0.1-5.0 hydroxy equivalent weights per 1 hydroxy equivalent weight of the polyol to be foamed.

Process of producing cross-linked urethane-group comprising foams of

This invention relates to an emulsion-breaking composition comprising about 70 to 99.8% by weight of at least one silicon-free demulsifier, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate, the polyoxyalkylene blocks of which have a molecular weight of about 500 to 4000 and are composed of polyoxyethylene and polyoxypropylene blocks in a weight ratio of 40 to 60 to 100:0, and the polysiloxane blocks of which contain 3 to 50 silicon atoms per block. The invention also includes a process for breaking emulsions using the novel emulsion-breaking composition.

Use of demulsifying mixtures for breaking petroleum emulsions

A method for hydrolysis and condensation of alkyl/aryl-trichlorosilanes wherein the chlorosilanes are dissolved in liquid hydrogen chloride and the solution is hydrolized at a pressure of 15 to 80 atmospheres and at a temperature of -17.degree. to +47.degree. C. and water is present in an amount of 0.165 to 0.465 moles per chlorine atom attached to a silicon atom. After condensation, the reaction product is freed from hydrochloric acid and unhydrolyzed silanes. Also disclosed are new chlorosilanes prepared by the process of the invention.

Process for the hydrolysis and condensation of

A process for the production of high resilience, open celled polyurethane foams which do not shrink in storage using conventional and readily available polyisocyanates and polyoxyalkylene polyols wherein from 0.01 to 2.0 g/100 g of polyol of specific siloxane components are added to the foaming charge. Foams produced by the process are also disclosed.

Process for the production of high resilience polyurethane foams and

This invention relates to a process for preparing polysiloxane-polyoxyalkylene block copolymerizates at whose polysiloxane block are laterally bonded at least two polyoxyalkylene blocks, and which contain at least two structural units having the formula ##STR1## WHEREIN R.sup.1 is an alkylene group, R.sup.2 is a monovalent hydrocarbon group and/or a trialkylsilyloxy group, OR.sup.6 is a polyoxyalkylene block derived from an alcohol R.sup.6 OH, and p = 1 or 2, which comprises adding onto polysiloxanes with SiH groups silanes having the formula ##STR2## WHEREIN R.sup.3 is an alkenyl group and X a halogen or an alkoxy group, and reacting this intermediate product with a polyoxyalkylene monool. The invention also relates to novel compounds produced by the process.

Process for preparing polysiloxane-polyoxyalkylene mixed block

In the disclosed process of producing resilient open-celled, cross-linked polyurethane foams, by foaming polyol, a polyisocyanate, catalyst and blowing agent, the foaming is effected in the presence of a cross-linker which is a saturated or unsaturated, aliphatic, cycloaliphatic, heteroaliphatic or arylaliphatic crystalline polyhydroxy compound having at least three hydroxy groups. The crystalline polyhydroxy compound is insoluble or only slightly soluble in the polyl to be foamed and melts within the temperature range of about 60 - 160.degree. C. The amount of crystalline polyhydroxy compound to be used corresponds to about 0.1 - 5.0 hydroxy equivalent weights per 1 hydroxy equivalent weight of the polyol to be foamed. Additionally, a compound that breaks down the association of water molecules can be added.

A process for the preparation of polyetherurethane foams is disclosed, wherein polyether alcohol and polyisocyanate are foamed in the presence of water or low-boiling propellant and polyalkyleneglycol-polysiloxane mixed block polymer foam stabilizer. In accordance with the invention, the mixed block polymer foam stabilizer has the general formula ##STR1## wherein M IS UNIFORM OR APPROXIMATELY UNIFORM WITHIN EACH SILOXANE BLOCK OF EACH MOLECULE AND STANDS FOR 5 OR 6;

Process of preparing polyetherurethane foams

A method is disclosed for preparing equilibrated organopolysiloxane mixtures having organosulfonic acid groups attached to silicon atoms by reacting organopolysiloxanes with organosulfonic acids and simultaneously removing the water formed from the reaction mixture. The compounds thus prepared are used for a variety of industrial purposes.

Process for preparing equilibrated organopolysiloxane mixtures with

Block copolymers of linear or branched, polyorganosiloxanes and organic polymers are prepared by reacting at least approximately equilibrated polyorganosiloxanes having reactive silyl end groups with terminally organoalkalifunctional organic polymers.

Process for the production of polyorganosiloxane block copolymers

A method for the preparation of organopolysiloxane-polyether copolymers where the polysiloxane blocks are linked to the polyether blocks through SiOC linkages is disclosed wherein a mixture of organo halogen silanes and organopolysiloxanes are equilibrated using a novel mixed catalyst of a hydrogen halide acid and a peralkylated acid amide. The process produces copolymers having improved shelf life which produce polyurethane foams having excellent stability and other advantages.

Process for the preparation of organopolysiloxane-polyether copolymers

The invention relates to a process for the preparation of at least substantially equilibrated organopolysiloxane mixtures with silyl halide groupings through redistribution of siloxane and silyl halide groupings in the process of equilibrating catalysts, if necessary at elevated temperatures.

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Haltern-Lavesum, Germany

Gerd Rossmy