Trisoplast International B.v.

Altalanos Iparfejlesztesi Rt.

Vizepitooipari Troszt

Aannemingsbedrijf Van Der Biggelaar Limburg B.v.

Mta Termeszettudomanyi Kutato Laboratoriumai

Oszkar Libor

Gabor Nagy

Tamas Szekely

Jacobus Cornelis Wammes

Janos Szepvolgyi

Andras Gal

Andras Danko

Rudolf Mester

Kalman Kazareczki

Tibor Muller

Jeno Kiss

Zoltan Saghi

A method for producing a modified smectite or smectite-containing substance including treating a non-activated smectite or substance with a water soluble activating agent and polymer in a two stage process, the first stage including adding 0-3.0% of the activating agent and 0.05-1.0% of the polymer, by weight, and in a second stage adding 0-5.0% of the activating agent 0.3-5% of the polymer, by weight, to the mixture of the first stage, wherein at least a part of the polymer is added as a dry solid and the water in the first stage is at least 20% by weight and at most 50% by weight in the second stage.

Method of producing a modified smectite or smectite-containing substance capable of taking up and releasing water in a reversible manner

The invention relates to a clay-containing mixture or blend capable of forming a moisture resistant gel, which comprises a powdered or ground smectite and/or a smectite-containing natural rock and at least 0.8&#x2013;10% by weight, calculated for the smectite content, of an at least partially water-soluble and/or water swellable polymer and optionally at least 0.5% by weight of a solid activating agent. Such a mixture may also additionally comprise as a diluting agent more than 0.5% by weight of one or more solid inert filler(s); this diluted version is termed in the specification as a blend.

Clay-containing mixture or blend capable of forming a moisture resistant gel, and use of that mixture and blend

Clay-containing mixture and blend capable of forming a moisture

The present invention relates to a method for producing a closing layer which improves the water and nutrient retention of soils, particularly of sandy soils, characterized in that a layer of clay mineral/polymer gel capable of binding and releasing water in a reversible manner is introduced into the soil, preferably 20-60 cm below the soil surface, in such a way that a clay mineral is reacted either before or after or during activation in the presence of water, with 0.5-30% by weight, calculated for the weight of the clay mineral, of one or more water-soluble polymer capable of reacting with the clay mineral, the water content of the resulting gel is adjusted either before or after or during the reaction to a value at which the resistance of medium of the gel is at least three times higher than that of a polymer-free suspension containing the same amount of the clay mineral, if a non-activated clay mineral has been applied as starting substance, the clay mineral is activated with an alkaline activating agent after reacting it with the polymer, and, if desired, further amounts of a water-soluble polymer, one or more water-insoluble swelling xerogel capable of at least 100% water uptake and forming swollen particles less than 1 mm in diameter and/or one or more chemical for agricultural use, preferably a plant nutrient, a fungicidal substance acting against soil-borne fungi and/or a plant growth increasing substance, is added to the gel either before or after or during the reaction with the polymer, and/or, if desired, the gel and the non-reacted polymer molecules are cross-linked with an aldehyde, and finally the thus-formed gel layer is covered with a soil layer.

Method for producing a barrier layer in soil

A method is disclosed for improving the strength and impermeability of soils or engineering structures, which comprises the steps of:

Method for improving the strength and impermeability of soils and

The invention relates to a process for the preparation of clay mineral-containing gels with stabilized structure and reversible water absorption ability. According to the invention an aqueous suspension containing a thixotropic, activated, swelling clay mineral of three-layer structure and/or a swelling chain silicate is treated with a water soluble polymer capable of reacting with the clay mineral and/or chain silicate, the clay mineral:polymer:water ratios are determined at which the resistance of medium of the resulting suspension is at least ten times higher than that of the initial, polymer-free suspension, and then the components are reacted with each other in the pre-determined ratios.

Process for the preparation of clay mineral-containing gels with

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Budapest, Hungary

Oszkar Libor