Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Horst Scholze

Helmut Schmidt

Gerhard Tunker

Helmut Patzelt

Alfred Kaiser

Milan A Koutecky

Ivan V Bakardjiev

A lacquer system which essentially comprises a silicic acid heteropolyconsate, a flake-shaped or lamellar filler, a solvent and, if appropriate a conventional synthetic resin for lacquers is suitable for producing anti-corrosion coatings, especially on glass surfaces.

Lacquer, and process for producing anti-corrosion coatings

A lacquer system which essentially comprises a silicic acid heteropolyconsate, a flake-shaped or lamellar filler, a solvent and, if appropriate, a conventional synthetic resin for lacquers is suitable for producing anti-corrosion coatings, especially on glass surfaces.

Membranes based on silicic acid heteropolycondensates are produced by hydrolytic polycondensation of at least one silicic acid derivative in the presence of water and, if appropriate, a condensation catalyst, the polycondensation being carried out at the surface of a support, which supports the resulting membrane. The reactants can be fed to the surface of the support via the gas phase or via one or more liquid phases.

Membranes based on silicic acid heteropolycondensates and a process for

A method of heat-sealing substrates, particularly glass to glass or glass to other materials, which comprises using as a heat-sealing medium a silicic acid heteropolycondensate prepared by hydrolysis and polycondensation of at least one organosilane and at least one component selected from the group consisting of silicon-functional silanes, substantially involatile oxides soluble in the reaction medium, or compounds convertible thereto, and organofunctional silanes. The heat-sealing bonds obtained are strong, durable and moisture resistant, the excellent moisture resistance being of special benefit in the heat-sealing of glass substrates.

Method of heat-sealing substrates

Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.

Method of preparation of porous membranes and adsorbents

A process for the production of silicic acid heteropolycondensates wherein at least one substituted silane; at least one functional silane; at least one hydrolysable silicic acid derivative and optionally at least one substantially involatile oxide soluble in the reaction medium, or a compound convertible thereto, are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The heteropolycondensates prepared by this process are useful in the preparation of coatings for substrates, which coated substrates are useful as supports in the culture of living cells.

Process for the production of silicic acid heteropolycondensates useful

A process for the production of silicic acid heteropolycondensates, wherein at least one hydrolysable silicic acid derivative; at least one substituted silane; optionally at least one functional silane and/or optionally at least one substantially involatile oxide soluble in the reaction medium or at least one compound forming a substantially involatile oxide are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The polycondensates are useful in the production of membranes and adsorbents.

A process for disintegrating material containing alkali-alkali earth silie for yielding alkali silicate or alkali carbonate solutions and materials having a large specific surface is characterized in that a material containing silicate is crushed and subsequently is treated in an autoclave at a temperature in excess of 100.degree. C, preferably in excess of 130.degree. C, with a solution containing alkali carbonate.

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Wurzburg, Germany

Horst Scholze