Basf Aktiengesellschaft

Gerold Schreyer

Franz Haas

Gerhard Welzel

Richard Bung

Gerhard Janisch

Karl Gans

The surfaces of particulate adsorbents are consolidated by a process in which the adsorbent is impregnated with a cationic aqueous polymer solution and then treated with an anionic aqueous dispersion of a polymer having a softening point of from 60.degree. to 150.degree. C. and the materials are dried together.

Consolidation of the surfaces of particulate adsorbents

An apparatus for the preparation of bonding fibers, especially for the production of nonwovens by a wet-lay process, wherein a polymer dispersion, containing an anionic or nonionic dispersant, and an aqueous solution, containing a dissolved cationic precipitant, are combined to cause fiber formation from precipitated polymer particles, which apparatus includes a feed funnel spaced above the bottom of a homogenization vessel with both a nozzle for introducing the polymer dispersion and a metering device for the precipitant, which are so arranged and aimed into the funnel that in co-operation with a stirrer a vortex is produced in a column of liquid in the feed funnel, and fibers are formed and broken up while passing through a turbulence chamber, located at the bottom of the funnel, and a gap into a homogenization chamber.

Apparatus for the preparation of bonding fibers from polymer dispersions

A process for consolidating the surface of a granular adsorbent, wherein thermoplastic crosslinkable bonding fibers are applied from aqueous suspension, the water taken up by the adsorbent is evaporated off and the bonding fibers adhering to the surface of the adsorbent are crosslinked by heating. The adsorbent thus treated has virtually the same adsorption and desorption properties as the untreated adsorbent, but exhibits substantially improved abrasion resistance.

Consolidating the surface of a granular adsorbent

A process for consolidating the surface of a granular adsorbent, wherein a water-containing adsorbent, which has taken up 25-70% by weight of the maximum possible amount of water, is heated to a temperature at which the water taken up evaporates, and is at the same time treated with an aqueous dispersion of a self-crosslinking copolymer, and the adsorbent thus coated is heated to a temperature at which the copolymer crosslinks. The coated adsorbent has virtually the same adsorption and desorption properties as the untreated adsorbent, but in contrast exhibits substantially improved abrasion resistance.

A process for the repeatable production of shaped particles of various geometries from polymer dispersions, melts or solutions, wherein first particles are expelled by means of a rotating disk and are introduced while still liquid, in a radially outward direction, into a liquid precipitant or fixant film and the particles are thereby coagulated or fixed and also given an additional structure and are transported away from the point of introduction.

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Ludwigshafen, Germany

Gerold Schreyer