Abstract:
The present invention relates to microcapsules comprising a capsule core and a capsule wall, obtainable according to a method comprising the radical polymerization of an oil-in-water emulsion comprising the following components: 30 to 90 % by weight relative to the total weight of the monomers of one or more monomers (monomers I) from the group comprising C1-C24-alkyl esters of acrylic and/or methacrylic acid, acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid, 10 to 70 % by weight relative to the total weight of the monomers of one or more ethylenic unsaturated cross-linking agents (monomers II), wherein at least 10 % by weight relative to the total weight of the monomers I, II, and III is a highly branched polymer cross-linking agent, 0 to 30 % by weight relative to the total weight of the monomers (monomer III), different from monomer I, and hydrophobic core material, to a method for the production thereof, and to the use thereof.
Abstract:
Mezcla que contiene (A) al menos un aglutinante hidráulico o latentemente hidráulico, (B) al menos un copolímero que puede obtenerse mediante reacción de (α1) al menos un comonómero etilénicamente insaturado con al menos un grupo funcional seleccionado de grupos COOH, grupos ácido sulfónico, grupos nitrilo, grupos hidroxialquilo y grupos amino o (α2) al menos un (co)polímero de al menos un comonómero etilénicamente insaturado con al menos un grupo funcional seleccionado de grupos COOH, grupos ácido sulfónico, grupos nitrilo, grupos hidroxialquilo y grupos amino con (β) al menos un compuesto oligomérico o polimérico que puede obtenerse mediante reacción de (a) al menos un ácido di- o policarboxílico etilénicamente insaturado o su anhídrido o éster con (b) al menos un alcohol al menos trifuncional y (c) al menos un compuesto de fórmula general I**Fórmula** en la que las variables se definen tal como sigue: R1 se selecciona de alquilo C1-C4, A es igual o distinto y se selecciona de alquileno C2-C6, n se encuentra en el intervalo de 4 a 40, y (d) eventualmente al menos otro compuesto con al menos un grupo COOH o al menos un grupo OH alcohólico por molécula.
Abstract:
The present invention relates to microcapsules comprising a capsule core and a capsule wall, obtainable according to a method comprising the radical polymerization of an oil-in-water emulsion comprising the following components: 30 to 90 % by weight relative to the total weight of the monomers of one or more monomers (monomers I) from the group comprising C-C-alkyl esters of acrylic and/or methacrylic acid, acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid, 10 to 70 % by weight relative to the total weight of the monomers of one or more ethylenic unsaturated cross-linking agents (monomers II), wherein at least 10 % by weight relative to the total weight of the monomers I, II, and III is a highly branched polymer cross-linking agent, 0 to 30 % by weight relative to the total weight of the monomers (monomer III), different from monomer I, and hydrophobic core material, to a method for the production thereof, and to the use thereof.
Abstract:
Geschäumte Polymere zeichnen sich vor allem durch ihre hohe spezifische Oberfläche im Vergleich zu Ihrer Masse aus, weshalb sie in der Lage sind, große Mengen an Flüssigkeiten aufzunehmen. Im Allgemeinen werden solche Materialien auch als „superabsorbierend” bezeichnet. Geschäumte Polymere eignen sich daher unter Anderem hervorragend als Material in Hygieneartikeln zur Aufnahme von Körperflüssigkeiten wie beispielsweise Windeln. Bei dem erfindungsgemäßen Verfahren zur Herstellung eines geschäumten Polymers (gP) werden Abfallreste, die bei der Verarbeitung des geschäumten Polymers (gP) anfallen, in partikulärer Form den Ausgangsmaterialien zugegeben und erneut aufgeschäumt.
Abstract:
The present invention relates to microcapsules comprising a capsule core and a capsule wall, obtainable according to a method comprising the radical polymerization of an oil-in-water emulsion comprising the following components: 30 to 90 % by weight relative to the total weight of the monomers of one or more monomers (monomers I) from the group comprising C
Abstract:
The present invention relates to a process for producing polymer composites suitable for absorbing and storing aqueous liquids and to the polymer composites obtainable by this process. The invention further relates to the use of these polymer composites. The process comprises free-radical polymerization of a monomer composition M which a) 50 to 100% by weight, based on the total amount of monomers A and B, of at least one monomer A having one ethylenic double bond and at least one neutralizable acid group, b) 0 to 50% by weight of optionally one or more comonomers B which are different than the monomers A and have one ethylenic double bond, and c) 0 to 10% by weight, based on the total amount of monomers A and B, of at least one crosslinker C, wherein the polymerization of the monomer composition is performed in an aqueous suspension of a water-insoluble particulate substance S comprising cellulose or lignocellulose, the weight ratio of the monomer composition M to the substance S being in the range from 9:1 to 1:9; and wherein the monomers A used for polymerization are present in the aqueous suspension in neutralized, i.e. anionic, form to an extent of at least 10 mol%, frequently to an extent of at least 20 mol%, particularly to an extent of at least 30 mol% and especially to an extent of at least 35 mol%.
Abstract:
The invention relates to mixtures comprising (A) at least one hydraulic or latent hydraulic binding agent, (B) at least one copolymer obtainable by converting (a1) at least one ethylenic unsaturated comonomer having at least one functional group, selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups, and amino groups, or (a2) at least one (co)polymer of at least one ethylenic unsaturated comonomer having at least one functional group selected from COOH groups, sulfonic acid groups, nitrile groups, hydroxyalkyl groups, and amino groups, having (ß) at least one oligomer or polymer compound obtainable by converting (a) at least one ethylenic unsaturated di- or polycarbolic acid or an anhydride or ester thereof, with (b) at least one at least trifunctional alcohol, and (c) at least one compound of the general formula I wherein the variable are defined as follows: R1 is selected from C1-C4-alkyl and hydrogen, A is identical or different and selected from C2-C6-alkylene, n is in the range of 4 to 40, and (d) optionally at least one further compound having at least one COOH group or at least one alcoholic OH group per molecule.
Abstract:
A process for preparing mechanically stabilized polyazoles, comprising the following steps: I) treating at least one polyazole having at least one amino group in a repeat unit with a solution comprising (i) at least one strong acid and (ii) at least one stabilizing reagent, the total content of stabilizing reagents in the solution being in the range from 0.01 to 30% by weight, II) performing the stabilization reaction directly and/or in a subsequent processing step by heating to a temperature greater than 25°C, using at least one high-functionality polyether as the stabilizing reagent. The polyazoles thus obtainable are notable especially for a high conductivity and a very good mechanical stability. They are therefore especially suitable for applications in fuel cells.