Borealis Gmbh

Ami Agrolinz Melamine International Gmbh

Borealis Ag

Agrolinz Melamin Gmbh

Pcd Polymere Gesellschaft M.b.h.

Borealis Agrolinz Melamine Gmbh

Pcd Polymere Ges. M.b.h.

Hartmut Bucka

Achim Hesse

Norbert Reichelt

Manfred Raetzsch

Ulf Panzer

Gerhard Coufal

Frank Schröder

Ferdinand Koglgruber

Matthias Stolp

Hans-Joachim Radusch

Steffen Pfeiffer

René Dicke

Reiner Mehnert

Martin Burger

Frank Meister

Bernd Riedel

Christoph Neumüller

Manfred Rätzsch

Markus Machherndl

Hermann Heinemann

Dirk Leistner

Sascha Kaltenbacher

Konrad Buehler

Manfred R Atzsch

Markus Grossalber

Faramarz Bairamijamal

Christian Fürst

Ina Sigmund

Johannes Fellner

Peter Weiss

Paul Toplack

Christian Fuerst

Guenter Tappeiner

Peter Breiteneder

Alisa Mujkanovic

The invention relates to a thermoplastic processible aminoplast resin, a method for its production and a fine fiber non-woven material as textile area of fibers from aminoplast resins, in particular duroplastic triazine resins, which have an average fiber diameter of 0.1 to 100 &#x3bc;m and between 1 and 1000 branching arms and between 1 and 300 branching points per square millimeter. The invention also relates to a method for production of duroplastic fine fiber non-woven material in which a melt of melamine resin is pressed through spinning nozzles and blown by the escaping hot air to fine fibers, the fine fibers are separated from the air stream and deposited to a non-woven material consisting of a tangled layer, a treatment with a media causing cross-linking and a neutralization step follows, and the fine fibers are glued to a non-woven material in a subsequent thermal after-treatment, whereat the thermal after-treatment comprises two steps.

Thermoplastically processible aminoplastic resin, thermoset microfibre non-wovens, and process and plant for their production

The invention relates to a method for treating triazine-containing water of a melamine plant. The method is characterized in that the water containing ionic and non-ionic triazines in a dissolved form is fed to at least one membrane filtration unit, the water is separated into an ionic triazine-rich fraction and a non-ionic triazine-rich fraction in the membrane filtration unit, whereupon the ionic triazine-rich fraction is discharged and the non-ionic triazine-rich fraction is redirected into the melamine plant. The inventive method allows a great portion of the melamine contained in the triazine-containing water to be redirected into the process while the yield is increased along the entire melamine process. Furthermore, the need for fresh water in the wet part of the melamine plant is decreased. The disclosed method can be carried out continuously and in liquid phase.

Method for the treatment of triazine-containing water of a melamine plant

The invention relates to a method and a device for producing melamine by means of the thermal conversion of urea. The invention is characterized in that: a) urea is reacted to form melamine at least partially under reaction conditions wherein an educt, an intermediate and/or an end product are present in a supercritical state; and b) the mixture consisting of at least one educt, an intermediate and/or an end product essentially forms a homogeneous phase and all educts, intermediates, and/or end products are in a complete solution. The single-phase reaction results in an especially efficient reaction.

Method and device for producing melamine in a single-phase tubular reactor

A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH. In the second stage, the off-gases are contacted with a fresh urea melt.

Process for purifying off-gases of a melamine plant

The invention relates to products, especially moulding materials of polymers containing triazine segments and consisting of mixtures of meltable 4&#x2013;18 ring oligotriazine ethers which are soluble in highly polar solvents, and in which the triazine rings are predominantly linked by alkylene diamino groups. Said moulding materials can contain up to 50 mass % of other reactive polymers such as ethylene copolymers, maleic acid anhydride copolymers, modified maleic acid anhydride copolymers, poly(meth)acrylates, polyamides, polyester and/or polyurethanes, up to 75 mass % of filling materials and/or reinforcing fibres, and up to 2 mass % of stabilisers, UV absorbers and/or auxiliary agents. The moulding materials of polymers containing triazine segments can be processed by means of conventional fusion methods and can be used as hot-melt adhesives and for producing plates, tubes, profiles, injection moulded parts, fibres, coatings and foamed material.

Products, especially moulding materials of polymers containing triazine segments, method for the production thereof and uses of the same

A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.

Process for the production of melamine

A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NHto give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled to a temperature which is 1-50&#xb0; C., preferably 1-30&#xb0; C., above the melting point of the melamine, which is dependent on the prevailing NHpressure. Introduction of NHin countercurrent drives out the COformed, after which the melamine melt is worked up in any appropriate way.

Method for the production of melamine

A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH , introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.

Method for producing melamine

Modified polypropylenes of improved processability

Structurally isomeric poly(alkyl ethylenes) with H and Y structures, polymeric bridging segments and a Y index of 2&times;10 to 8&times;10 (kJ/mole/degree), have decreased instability in the melt and more advantageous processing properties. The structurally isomeric poly(alkyl ethylenes) with H and Y structures are synthesized by an irradiating method, a melt reaction method or a solid phase reaction method by reacting poly(alkyl ethylenes) with 0.05 to 5% by weight of monofunctional, difunctional and polyfunctional monomers, optionally in the presence of peroxides. The structurally isomeric poly(alkyl ethylenes) are suitable for producing films, sheets, panels, coatings, pipes, hollow objects and foams.

Structural isomers of poly (alkyl ethylenes)

Thermoplastic elastomers of good dyeability and high strength and elasticity, the incorporated elastomeric particles of which have and average particle diameter of 0.05 to 5 &mgr;m. The thermoplastic elastomers are formed according to a method in which mixtures of propylene homopolymers and/or propylene copolymers, elastomeric C,C,olefin copolymers and/or terpolymers and C,to C,diacrylates, C,to C,diallyl compounds, C,to C,dimethacrylates, C,to C,divinyl compounds, C,to C,acrylate esters of polyalcohols, C,to C,methacrylate esters of polyalcohols and/or C,C,triallyl compounds are added to a melt. The thermoplastic elastomers, as well as mixtures of the thermoplastic elastomers with conventional polyolefins, are suitable for use in the vehicle industry, in the domestic appliances industry, in the construction industry and in medical technology.

Thermoplastic elastomers of good dyeability and high strength and elasticity as well as impact-resistant polymer blends produced therefrom

Thermoplastic elastomers of high strength, high elasticity and good dyeability, the incorporated elastomeric particles of which have an average particle diameter of 0.05 to 5 &mgr;m, from propylene homopolymers and/or propylene copolymers, elastomeric C,to C,olefin copolymers and/or terpolymers and multifunctional, unsaturated monomers are formed by a method, for which mixtures of propylene homopolymers and/or propylene copolymers, elastomeric C,to C,olefin copolymers and/or terpolymers and readily volatile C,to C,dienes are reacted in the melt. The thermoplastic elastomers, as well as mixtures with conventional polyolefins, are suitable for use in the vehicle industry, in the domestic appliances industry, in the building sector and in medical technology.

Thermoplastic elastomers of high strength and elasticity and of good dyeability and polymer blends of high strength produced therefrom

Polyolefin foam materials of high dimensional stability at elevated temperatures are produced from modified polypropylenes and unmodified polypropylenes. The modified polypropylenes used are produced by mixing polypropylene particles with thermally decomposing free radical-forming agents, absorbing readily volatile bifunctional monomers and heating and melting the mixture. Areas of application for the polyolefin foam materials of high dimensional stability at elevated temperatures are the packaging sector, motor vehicle parts, sports and leisure equipment, industrial applications, as well as applications in the building sector.

Polyolefin foam materials of high dimensional stability at elevated temperatures

Modified polypropylenes of improved processability are produced by a continuous method by absorptively charging polypropylene particles at 20&deg; to 120&deg; C. with a gas mixture, which contains oxygen and bifunctional, unsaturated monomers, and melting the mixture. The modified polypropylenes of improved processability as well as mixtures with unmodified polypropylenes are suitable for the production of films, sheets, fibers, panels, coatings, pipes, hollow objects and foamed materials.

Segmented polyolefins, which are produced by the reaction of mixtures of powdery polyolefins and polyolefin granulates with unsaturated monomers in the presence of thermally decomposing free radical-forming agents in continuous mixers in two consecutive reaction steps in the solid phase, a reaction step in a solid phase/melt transition phase and a melt homogenizing step, have a high strength and tenacity. The segmented polyolefins, as well as mixtures with conventional polyolefins, are suitable for the production of films, sheets, fibers, panels, coatings, pipes, hollow objects and foams.

Segmented polyolefins

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Eggendorf, Austria

Hartmut Bucka