Dynamit Nobel Aktiengesellschaft

Huels Aktiengesellschaft

Huels Troisdorf Ag

Jurgen Amort

Heinz Nestler

Horst Hanisch

Claus-Dietrich Seiler

Hendrikus Van Der Maas

Ute Klapdor

Hans-Joachim Vahlensieck

Manfred Ohlinger

Helmut Jakusch

Paul Deigner

Gunther Bernhardt

Margret Haas

Heinz Kragl

Otto Ambros

Hans P Suerken

Eduard Schonafinger

Hans-Joachim Kotzsch

Hermann Peeters

Fritz Englander

Leo Hans Plankl

Hans-Peter Suerken

The present invention is in the preparation of methacrylic or acryloxyalkylalkoxysilanes by the reaction at a temperature of from 80.degree. and 130.degree. C. of an alkali (meth) acrylate with a halogen alkylalkoxysilane in the presence of a quaternary ammonium salt which has long-chin alkyl moieties, in which the sum of all carbon atoms is between 10 and 40 as a phase-transfer catalyst. In the new procedure no solvents need to be used. The yields are better than 95%.

Method for the preparation of organosilanes containing methacryloxy or

Organosilanes comprising methacryloxy groups or acryloxy groups are stabilized with a mixture consisting of at least one N,N'-di-substituted-p-phenylenediamine and at least one substituted phenol, which yields products with high purity and high yields.

Process for stabilizing organosilanes containing methacryloxy or

Disclosed is a casting resin of reduced viscosity based on methacrylic acid esters with a high content of aluminum hydroxide as filler containing a mixture of at least one organosilicon compound with a functional group, at least one silicic acid ester, and at least one organic metallic acid compound of metals of Groups IVB and/or VB of the Periodic Table of the Elements. The functional group of the organosilicon compound is ethylenically unsaturated and bound to the silicon atom either directly or by alkylene groups. The casting resins of the invention have improved working qualities. Plastic objects and moldings manufactured from these resins have decidedly improved use properties.

Aluminum hydroxide filled casting resins on a basis of methacrylic acid

Disclosed is a process for the performance of organic reactions in the liquid phase wherein silicone oils are used as the reaction medium. These silicone oils have no functional groups, are liquid at room temperature and have viscosities between 40 and 20,000 cs. at 25.degree. C. The obtained reaction products are very pure and generally do not require additional purifying operations.

Method for performing organic reactions in silicone oils

The present invention is in the modification of starch by silanes and is performed by bringing the starch into intimate contact with the hydrolyzates of the silanes in the presence of alkali aluminates or alkali hydroxides. Preferably this is done in the aqueous solution of the silane hydrolyzate, in which case the additives can be used either in aqueous solution or in solid form. The aluminate or alkali hydroxide is present at least in such an amount that 0.4 mol of aluminate will be present for each mole of silane. The modification is possible not only with alkyl alkoxysilanes, but also with organofunctional alkoxysilanes. The starch modified with the silanes has better practical properties than corresponding unmodified starch and can be used, for example, for the hydrophobation and oleophobation of cellulosic material.

Method for the modification of starch in an aqueous medium

A method for the modification of starch by silanes wherein the starch and silane are contacted in an organic solvent in the presence of a metallic acid ester of a metal of groups IVB or VB of the Periodic Table of the elements. The resulting suspension is stirred. The subsequently separated starch exhibits better working characteristics than the corresponding unmodified starch.

Method for the modification of starch in the presence of solvents

A process for the preparation of a halogen silane and an aromatic compound having at least one --C.dbd.O-- of ##STR1## group, while simultaneously effecting cleavage of a siloxane by contacting a compound having at least one aromatically bound mono and/or dihalogen methylene group or an aromatic compound having a mono-, di and or trihalogen methyl group of the formula ##STR2## wherein the aromatic moiety can be optionally otherwise substituted, with a siloxane of the formula ##STR3## wherein each R moiety is independently selected from the group consisting of halogen, alkyl, alkenyl and O-SiR.sub.3, wherein such R moiety is halogen, alkyl or alkenyl, wherein at least two of the R moieties can, together with the silicon atom to which they are attached, form a ring, at an elevated temperature in the presence of a catalytic amount of a metal or a metal compound, which metal is of the sub-group of elements or of the 5th principal group of the periodic system of the elements, together with a proton donor, or in the presence of a catalytic amount of an oxygen acid.

Method of cleaving siloxanes

An iron oxide pigment having a coating of a silane of the formula

Iron oxide magnetic pigments for the production of magnetic coatings

A laminate comprising an inorganic oxidic or metallic surface and a polymer, the laminate having in the region of the interface between inorganic oxidic or metallic surface and the polymer a silane having a capped function group; the use of silanes having capped functional groups as adhesivizing agents especially for use between organic polymers and substances having inorganic oxidic and/or metallic surfaces. Also disclosed is the surface of an inorganic oxidic or metallic surface resistive to corrosion by applying thereto a silane having a capped functional group.

Use of silanes having capped functional groups as adhesivizing agents

Method of preparing phthalide by hydrogenolysis of 3-chlorophthalide in the presence of a nobel metal catalyst, wherein hydrogenolysis is carried out in the absence of HCl acceptor. The phthalide which is produced is a valuable chemical intermediate for the manufacture of dyes, plant protecting agents and pharmaceuticals.

Method of preparing phthalide

A sulfurous organosilicon compound of the general formula ##STR1## IN WHICH R represents a C.sub.1-4 alkyl, a cycloalkyl, a C.sub.1-4 alkyloxyalkyl or a phenyl radical,

Sulfurous organic silicon compounds, a process for their preparation,

A nitrogen group containing silane of the formula ##STR1## where R is a C.sub.1 -C.sub.4 alkyl group which can contain an oxygen or sulfur atom in the chain, R' is a C.sub.1-4 alkyl radical or hydrogen, A is a bivalent, saturated, branched or unbranched hydrocarbon radical having 2 to 4 carbon atoms in the chain and B is a bivalent, saturated, branched or unbranched hydrocarbon radical having 1 to 10 carbon atoms in the chain; the use of such compounds in an adhesive composition containing an organic polyaddition or polycondensation polymer as an adhesivizing agent.

Organofunctional silicon compounds as adhesivizers for organic binding

An improvement in a process for the impregnation of masonry with an alcoholic or benzine solution of an alkyltrialkoxysilane or a partial condensation product thereof which improvement involves including in the alcoholic or benzine solution an organofunctional silane having a basic organo group or an alcoholate of silicon, a metal of an element selected from the group consisting of the First Main Group of the Periodic System, a metal of the Second Main Group of the Periodic System, a metal of the Fourth Sub-Group of the Periodic System, and a metal of the Fifth Sub-Group of the Periodic System; an improved composition for the impregnation of masonry comprising a mixture of an alkyltrialkoxysilane or a partial condensation product thereof and an organofunctional silane having a basic organo group or an alcoholate of an element selected from the group consisting of silicon, a metal of the First Main Group of the Periodic System, a metal of the Second Main Group, a metal of the Fourth Sub-Group of the Periodic System and a metal of the Fifth Sub-Group of the Periodic System.

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Troisdorf-Sieglar, Germany

Jurgen Amort