Abstract: 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 ?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.

Abstract: 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 ?m and between 1 and 1000 branching arms and between 1 and 300 branching points per square millimetre. 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a method for producing duroplastic fine-fiber non-wovens, characterized in that: a) melts of reactive three-dimensionally cross-linkable, non-linear prepolymers are extruded by nozzles; b) the exiting melts are blown by means of hot air to form fine fibers; c) the fine fibers are separated by the flow of air and deposited to form a non-woven comprised of a fine-fiber weave; d) the non-woven is subsequently compacted, and; e) the non-woven is treated with a medium that initiates a three-dimensional cross-linking, and the fine fibers in the non-woven are inherently bonded and/or hardened in a subsequent thermal post-hardening. This enables duroplastic fine-fiber non-wovens to be economically produced that have both a high flame retardant effect as well as a high thermal protection, sound insulation and filtering capacity.

Abstract: 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.

Abstract: 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 NH3. In the second stage, the off-gases are contacted with a fresh urea melt.

Abstract: 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.

Abstract: The invention relates to a method for synthesizing a liquid melamine resin, wherein: a) melamine, at least one aldehyde and at least one alcohol are fed to at least one first reactor operated continuously, in particular at least one agitated tank operated continuously and are reacted together, b) the reaction product that is obtained is fed to a solid-liquid phase separation device, c) a solids-rich phase that has been produced in the solid-liquid phase separation is fed back to at least one first reactor, and d) a phase devoid of solids that has been produced in the solid-liquid phase separation is subjected to additional processing steps. The invention thus provides an efficient continuous direct synthesis method for a liquid melamine resin.

Abstract: The invention relates to products, especially moulding materials of polymers containing triazine segments and consisting of mixtures of meltable 4–18 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.

Abstract: The invention relates to a direct synthesis method for producing etherified melamine resin condensates having average molar masses of 500 to 50,000. The method is characterized by the fact that a) an etherified melamine resin precondensate is produced in an alcoholic solution in a first reaction step; b) the etherified melamine resin precondensate is concentrated in an alcoholic solution in at least one condensation step, C4 to C18 alcohols, diols of type HO—R—OH, and/or tetravalent alcohols that are based on erythritol being added to the melamine resin precondensate during and/or following the concentration process; c) the concentrated melamine resin precondensate is reacted by means of a mixer, especially a kneader, in a second reaction step.

Abstract: An aminoplast molding compound comprised of mixtures consisting of meltable 20 to 1000-ring polytriazine ethers, in which the triazine rings are primarily linked by binding links of the —NH—CHR2—O—R4—O—CHR2—NH— and —NH—CHR2—NH— type, whereby: R2?H, C1-C7-alkyl; R4?C2-C18-alkylene, —CH(CH3)—CH2—<SB>C2-C12—<SB>-alkylene-O—CH2—CH(CH3)—, —CH(CH3)—CH2—O—<SB>C2-C12—<SB>-arylene-O—CH2—CH(CH3)—, —[CH2—CH2—O—CH2—CH2]n—, —[CH2—CH(CH3)—O—CH2—CH(CH3)]n—, —[—O—CH2—CH2—CH2—CH2—]n—, —[(CH2)2-8—O—CO—<SB>C6-C14—<SB>-arylene-CO—O—(CH2)2-8—]n—, —[(CH2)2-8—O—CO—<SB>C2-C12—<SB>-alkylene-CO—O—(CH2)2-8—]n—, wherein n=1 to 200.

Abstract: Disclosed is acetylated wood which has an acetyl group content of 3 to 30 percent by weight and can be produced by reacting wood products with isopropenyl acetate at temperatures of 50 to 125° C. in the present of 0.02 to 2 percent by weight of acid catalyst, the percentage being in relation to the used isopropenyl acetate. The reaction with isopropenyl acetate can take place in a liquid phase or gas phase. The acetylated wood produced according to said method is suitable for wood products requiring high dimensional stability and extended natural durability.

Abstract: A method for curing aminoplasts, during which layers having layer thicknesses of up to 300 um or filaments and fiber fibrids having a diameter of up to 300 um, which consist of: i) 95 to 99.95% by mass of solvent-free meltable aminoplast polycondensates with molar masses ranging from 1000 to 300000; j) 5 to 0.05% by mass of curing agents, which can be activated by actinic light and which are comprised of acidifiers of the blocked sulfonic acid and/or halogen-substituted triazine derivative and/or onium salt type, and optionally; k) 1 to 20% by mass, with regard to the meltable aminoplast polycondensates, of unmodified and/or modified maleic anhydride copolymers, and/or; i) 0.1 to 5% by mass, with regard to the meltable aminoplast polycondensates, of nanoparticles. The aminoplasts are cured by irradiating them with actinic light at a temperature between the melting point of the aminoplast polycondensate and the thermoinduced decomposition temperature of the light-activatable curing agents.

Abstract: 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 NH3, 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.

Abstract: Compositions for producing aminoplast products by means of melt processing consisting of: A) 95 to 99.9% by mass of solvent-free meltable polycondensates of melamine resins having molar masses ranging from 300 to 300 000; A) from 0.

Abstract: A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH3 to 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° C., preferably 1-30° C., above the melting point of the melamine, which is dependent on the prevailing NH3 pressure. Introduction of NH3 in countercurrent drives out the CO2 formed, after which the melamine melt is worked up in any appropriate way.

Abstract: 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 NH3. In the second stage, the off-gases are contacted with a fresh urea melt.

Abstract: 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 NH3, 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.

Abstract: The invention relates to products, especially moulding materials of polymers containing triazine segments and consisting of mixtures of meltable 4-18 ring oligotriazine ethers which are soluble in highly polar solvents, and in which the triazine rings are predominantly linked by alkylene diamiino 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.