Chemische Fabrik Stockhausen Gmbh

Stockhausen Gmbh & Co Kg

Miroslav Chmelir

Kurt Dahmen

Josef Pauen

Helmut Klimmek

Dolf Stockhausen

Eduard Barthell

Manfred Kaussen

Rudolf Nowak

Alois Kunschner

Anthony Capelle

The invention relates to a process for producing water-soluble or water-swellable polymer products from acrylic acid and/or acrylic acid derivatives partially or completely neutralized with nitrogen compounds and with exceedingly low levels of residual monomers, which process is characterized by subsequent heating of the polymer product at temperatures of from 120 to 240&#xb0; C. The polymers produced accordingly are suitable for use as flocculants, dispersants and absorbers.

Method for producing water-soluble or water-swellable polymerizates with a very low residual monomer content, products produced according to this method and the use thereof

The invention relates to a process for producing water-soluble or water-swellable polymer products with low levels of residual monomers using acrylic acid and/or acrylic acid derivatives, which process is characterized by adding a nitrogen compound to the monomer solution to be polymerized and subsequent heating of the polymer product at temperatures of from 120 to 240&deg; C. The polymers produced accordingly are suitable for use as flocculants, dispersants and absorbents.

Method for producing synthetic polymerizates with a very low residual monomer content, products produced according to this method and the use thereof

The invention relates to a method for producing water-soluble or water-swellable polymerizates with a low residual monomer content from acrylic acid and/or acrylic acid derivatives. The method is characterized by the addition of a nitrogen compound to the monomer solution to be polymerized, an in that the polymerizate is subsequently heated at temperature of 120 to 240&deg; C. The polymerizates produced according to the inventive method are suitable as flocculants, dispersants and absorbers.

Method for producing synthetic polymerizates with very low residual monomer content

Cross-linked synthetic polymers having a porous structure, a high

A process for the production of absorbing agents for water, aqueous solutions and body liquids consisting of at least two components A and B, whereby component A comprises a water-swellable, synthetic polymer or copolymer and component B comprises a natural or synthetic polymeric compound which at normal temperature is a pourable powder and is partially soluble or insoluble in water. Component B is added to component A in dry or partially swollen form during component A's production process after a monomer conversion of at least 30%, preferably at least 60% is attained, and is then mixed with the polymer gel of component A and subsequently dried. The invention further relates to the use of the absorbing agent for the absorption and/or retention of water and/or aqueous solutions, in particular of aqueous body liquids, such as urine or blood, in absorbent expendable products for hygienic, surgical and other medical purposes, such as diapers, tampons, and sanitary napkins; for the absorption and/or retention of water and/or aqueous solutions and subsequent controlled release of water and/or the substances dissolved in the aqueous medium to other bodies, as well as for drying gases and/or liquids, preferably organic liquids and solvents which are not miscible in water.

Process for the production of absorbing material with an improved

The present invention relates to an absorbing and swelling agent for water, aqueous solutions and body liquids, which consists of a mixture of at least two components, whereby component A is at least a water-swellable, synthetic polymer or copolymer cross-linked with a polyfunctional compound, and component B is at least a polysaccharide selected from the group consisting of galactomannans or polygalactomannans, as well as galactomannan derivatives or mixtures thereof with other natural or synthetic polymers which at normal temperature are present as pourable powders or as fibrous materials and are only partially soluble or insoluble in water. The invention further relates to the use of said absorber for the production of hygienic articles, for medical purposes, and for soil conditioning,

Polymer-based swelling and absorbing agents with an improved

The invention relates to a process for the production of absorbers for water, aqueous solutions and body liquids, the absorbers consisting of at least two components A and B, whereby component A is at least a water-swellable synthetic polymer or copolymer, and component B is at least a natural or synthetic compound being present at normal temperature as a pourable powder which is highly or at least partially soluble, in water, or as a liquid. The present invention is characterized by the fact that component B is added in the form of a powder, a liquid or as a solution to component A during the end phase of the production process thereof after a polymer reaction degree of 90%, preferably 95% is attained, that is is mixed with the polymer gel of component A and, in order to obtain a powdery, pourable end product, is dried, if necessary, and ground. The invention further relates to the use of said absorbers for the absorption and/or retention of water and/or aqueous solutions and for the subsequent controlled release of water and the substances contained in the swollen polymer gel and soluble in the aqueous medium (component B) to other bodies, preferably to plants, as nutrients for various cultures, and in the controlled dosage of nutrients and drugs.

Process for the production of water-absorbing polymer material with

The invention concerns a method of preparing homopolymers or copolymers that are water-soluble or swell up in water and have a low residual monomer content by treating them with at least one compound that can react with the monomer's double bond. The homopolymer or copolymer in the swollen form and in the form of a gel or in the form of a solution is treated with a compound, such as for example ammonia, an ammonium salt, an alkylamine and/or one of their salts or a hydroxylamine and/or their salts, that can react with the monomer's double bond and contains nitrogen or with a compound, such as a hydrogen halide, an acetoacetate, or a malonate, that contains an active hydrogen atom, or with a compound, such as bromosuccinimide, pyridinium bromide, or dioxane perbromide, that contains bromine and allows bromine to attach to the double bond, or with a compound, such as a permanganate, a bichromate, a chromate, selenium dioxide, or ozone, that can oxidize the double bond, or with a compound, such as an alkali sulfite or ammonium sulfite, an alkali or ammonium hydrogen sulfite or disulfite, or a thio compound, that contains sulphur, subsequent to which the resulting polymer gel or polymer solution is dried at an elevated temperature.

Method of preparing polymers with a low residual content of monomers

The present invention relates to an apparatus for the continuous production of polymers and copolymers of water-soluble monomers particularly acrylic acid and/or methacrylic acid, optionally with additional comonomers, by the polymerization of an aqueous monomer solution that is introduced into the trough that is formed by an endless conveyor belt. The trough-like shape of the conveyor belt changes continuously into an extended flat profile during the polymerization process; starting from the side edges and working towards the center of the trough formed by the conveyor belt, the resulting polymer gel strand is released continuously during the transition of the curved trough-like shape of the conveyor belt into the extended, flat form.

Apparatus for the continuous production of polymers and copolymers of

The present invention relates to a process and an apparatus for the continuous production of polymers and copolymers of water-soluble monomers particularly arcylic acid and/or methacrylic acid, optionally with additional comonomers, by the polymerization of an aqueous monomer solution that is introduced into the trough that is formed by an endless conveyor belt. The trough-like shape of the conveyor belt changes continuously into an extended flat profile during the polymerization process; starting from the side edges and working towards the center of the trough formed by the conveyor belt, the resulting polymer gel strand is released continuously during the transition of the curved trough-like shape of the conveyor belt into the extended, flat form.

Process for the continuous production of polymers and copolymers of

The invention relates to copolymers of esters of acrylic acid or methacrylic acid with unbranched alcohols that contain at least 16 C atoms, and maleic anhydride, and also the use of these copolymers as crystallization inhibitors in paraffin-bearing crude oils.

Copolymers of n-alkyl acrylates and maleic anhydride and their use as

A process for the finish dressing of leathers dressed by a mineral or a combined method, by treatment with an aqueous solution of water soluble polymer dressing substances that are polymers of unsaturated monomers that contain sulfonic groups. These polymers contain, if necessary, additional basic units that do not affect the water solubility, these being derived from the comonomers that can be copolymerized with the monomers that contain the sulfonic groups and which do not contain phosphorus.

Process for finish dressing minerally dressed leathers or those dressed

An absorption material is produced by applying directly to a support in the presence of liquid an absorbent which is at least partially water-softened, and drying to remove the liquid so as to leave the absorbent directly on the support. The support may be fibrous or particulate like sawdust or it may be a textile sheet or paper. The absorbent may be an acrylic based polymer. Because the absorbent directly contacts the support the product has increased absorptive capacity and is stronger, making it especially useful as a diaper, tampon, sanitary napkin, surgical dressing, battery separator and/or filter for cigarette smoke or for liquids.

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Krefeld, Germany

Miroslav Chmelir