Hoechst Aktiengesellschaft

Peter Eckardt

Franz J Voetz

Walter Dursch

Shaped articles made from expanded minerals, otained by using a mineral binder system composed either of calcium aluminate and aluminum phosphate or of waterglass and a catalyst to consolidate an expanded mineral which has been rendered hydrophobic and wherein the expanded mineral is rendered hydrophobic by means of an organosiloxane.

Shaped articles made from expanded minerals

An inorganic, phosphate-containing cellular material is manufactured from Portland cement, polyphosphoric acid and an expanding agent acting in an acidic medium. There may be added furthermore aluminous cement, oxides of calcium, zinc, aluminum, iron, hydroxides of aluminum and iron, fillers and reinforcing agents. By intense intermixing of the starting products a mixture is prepared which has an equivalent ratio of (Al+Mg+CA+Fe) to phosphate of 0.8:1 to 3.0:1. The mixture foams, is charged to a mold, heated if necessary to a temperature of 80.degree. C., and after completed exothermal reaction hardened under heat.

Inorganic cellular material and process for the manufacture thereof

Shaped articles made from expanded minerals obtained by treating a mixture of a hydrophobized expanded mineral and a calcium aluminate with an aqueous solution of aluminum phosphate, and subsequently consolidating it under the action of pressure and heat; the expanded mineral having been hydrophobized with a hydrophobizing agent consisting substantially of

A process is described for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230.degree. C and a filament titer of approximately 3 to 15 dtex. To this spun bond, a chemical binder is applied in the form of an aqueous dispersion which is dried at approximately 120.degree. to 220.degree. C. The dispersion consists of

Article and process for the manufacture of a carrier web

Limpid solutions suitable for making filaments and sheets of mostly aromatic polyamides are obtained by precondensation of the initial materials up to a conversion rate of from 80 to 98% in a solvent, neutralization with ammonia, separation of the insoluble ammonium halide, addition of an inorganic base, evacuation of the ammonia set free, subsequent after condensation and neutralization of the hydrogen halide newly formed. The spinning solutions prepared according to this process are stable and limpid and are excellently suitable for the preparation of shaped articles.

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Hofheim am Taunus, Germany

Peter Eckardt