Abstract:
The invention relates to finely divided starch-containing polymer dispersions, which can be obtained by the radically initiated emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein the ethylenically unsaturated monomers used are (a) 30 to 60% by weight of at least one optionally substituted styrol, (b) 1 to 60% by weight of at least one acrylic acid-C1-C12-alkyl ester and/or methacrylic acid-C1-C12-alkyl ester, (c) 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, and the starch used is (d) 15 to 40% by weight of at least one degraded starch having a molar mass Mw of 1000 to 65000 g/mol, wherein the sum (a) + (b) + (c) + (d) = 100% and relates to the total solid matter content, and wherein the polymerization is carried out in the presence of at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator. The invention further relates to a method for producing the finely divided starch-containing polymer dispersions by means of the emulsion polymerization of monomers (a), (b) and (c) using redox initiators in the presence of (d) degraded starch and at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator, and to the use of the finely divided starch-containing polymer dispersions as a sizing agent for paper, paperboard and cardboard.
Abstract:
AKD cellulosic composition obtainable by flowing a stream of a cellulosic suspension through a shearing device and in which a molten alkyl ketene dimer (AKD) is metered in to the stream of cellulosic suspension in or prior to the shearing device. The AKD cellulosic composition is particularly suitable in the manufacture of sized paper and paperboard.
Abstract:
A finely divided, starch-containing polymer dispersion which is obtainable by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein (a) from 0 to less than 40% by weight of at least one optionally substituted styrene, (b) from greater than 60 to 100% by weight of at least one C1-C12-alkyl acrylate and/or C1-C12-alkyl methacrylate, (c) from 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, are used as the ethylenically unsaturated monomers, the sum (a) + (b) + (c) being 100% and being based on the active monomer content and (d) from 15 to 40% by weight of at least one degraded starch which has a molar mass Mw of from 1000 to 65 000 g/mol, based on the total weight of solids content of components (a) + (b) + (c) + (d), are used as the starch, and the polymerization being carried out in the presence of at least 0.01% by weight, based on the monomers used, of at least one terpene containing chain-transfer agent, and in which the polymer dispersion optionally comprises an aluminium compound. The use of the finely divided, starch-containing polymer dispersions as sizes for paper, board and cardboard is also claimed.
Abstract:
dispersão de polímero aquosa, processo para preparação de uma dispersão de polímero aquosa, e, uso de uma dispersão de polímero aquosa a invenção refere-se a uma dispersão de polímero aquosa contendo amido finamente dividido, que é obtenível pela polimerização de emulsão de radical livre de monômeros etilenicamente insaturados na presença de pelo menos um iniciador de redox e amido, em que os monômeros etilenicamente insaturados compreendem (a) de 30 a 65% em peso de acrilonitrila e/ou metacrilonitrila, (b) de 35 a 60% em peso de pelo menos um acrilato de alquila c1-c12 e/ou pelo menos um metacrilato de alquila c1-c12, (c) de 0 a 35% em peso de pelo menos um outro monômero copolimerizável etilenicamente insaturado, em que a soma de (a), (b) e (c) totaliza 100%, e em que a dispersão de polímero aquosa compreende (d) de 10 a 55% em peso de um amido de tapioca iônico, em que o peso de (d) é com base nos sólidos totais de componentes (a), (b), (c) e (d) da dispersão de polímero aquosa. a invenção também se refere a um processo para a fabricação das dispersões de polímero aquosas contendo amido finamente dividido e também para o uso do dito amido finamente dividido contendo dispersões de polímero aquosas como uma cola para papel, cartão e papelão.
Abstract:
Dispersiones de polímero acuosas, catiónicas, de partículas finas, con partículas dispersadas de unagranulometría (tamaño de partícula) promedio de 5 a 250 nm, las cuales pueden obtenerse mediante polimerizaciónpor emulsión de monómeros etilénicamente insaturados en una solución acuosa de un prepolímero catiónico encalidad de dispersante, caracterizadas porque primero se produce el prepolímero catiónico en presencia deiniciadores de polimerización polimerizando (a) 15 a 40 % en peso de una mezcla de al menos dos (met)acrilatos diferentes que tienen respectivamente ungrupo amino y/o grupo amonio cuaternario, y/o (met)acrilamidas que portan respectivamente un grupo amino y/ogrupo amonio cuaternario, (b) 40 a 85 % en peso de al menos un estireno opcionalmente sustituido, (c) 0,5 a 5 % en peso de al menos un monómero etilénicamente insaturado que contiene grupos ácidos y (d) 0 a 20 % en peso de al menos un monómero etilénicamente insaturado, no iónico, distinto de (b),donde la suma de (a) + (b) + (c) + (d) >= 100 % en peso, en una polimerización en solución en un solvente parcial ototalmente miscible con agua, la solución/dispersión del prepolímero se mezcla luego con agua, y porque acontinuación en la solución acuosa del prepolímero se realiza una polimerización por emulsión en presencia deiniciadores de polimerización de una mezcla de monómeros de (i) 0 a 29 % en peso de al menos un estireno opcionalmente sustituido, (ii) 50 a 100 % en peso de al menos un (met)acrilato de C1 a C18, (iii) 0 a 30 % en peso de al menos un éster vinílico de ácidos carboxílicos de C1-C30 lineales o ramificados y (iv) 0 a 30 % en peso de al menos un monómero etilénicamente insaturado, no iónico, diferente de (i), (ii) y (iii),donde la suma de (i) + (ii) + (iii) + (iv) >= 100 % en peso, y la polimerización en solución y/o polimerización poremulsión se realiza opcionalmente en presencia de 0 a 10 % en peso de al menos un regulador de polimerización.
Abstract:
Una dispersión de polímero finamente dividida que contiene almidón, la cual es obtenible mediante polimerización en emulsión por radicales libres de monómeros etilénicamente insaturados en presencia de al menos una iniciadores redox y almidón, en la cual se utilizan (a) de 15 a 35% en peso de al menos un estireno opcionalmente sustituido, (b) de 65 a 80% en peso de al menos un acrilato de alquilo de C1-C12 y/o metacrilato de alquilo de C1-C12, (c) de 0 a 10% en peso de al menos otro monómero etilénicamente insaturado copolimerizable, como los monómeros etilénicamente insaturados, y la suma de (a) + (b) + (c) es igual a 100% con base en el contenido de monómero activo y se usan (d) de 15 a 40% en peso de al menos un almidón degradado que tiene una masa molar Mw de 1000 a 65 000 g/mol, con base en el peso total del contenido de sólidos de los componentes (a) + (b) + (c) + (d), como el almidón, y la polimerización se lleva a cabo en presencia de al menos 0.01% en peso, con base en los monómeros utilizados, de al menos un agente de transferencia de cadena que contiene terpeno, y en la cual la dispersión de polímero comprende opcionalmente un compuesto de aluminio.
Abstract:
Finely divided, starch-containing polymer dispersions which are obtainable by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, (a) from 30 to 60% by weight of at least one optionally substituted styrene, (b) from 1 to 60% by weight of at least one C1-C12-alkyl acrylate and/or C1-C12-alkyl methacrylate, (c) from 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, being used as ethylenically unsaturated monomers and (d) from 15 to 40% by weight of at least one degraded starch which has a molar mass Mw of from 1000 to 65 000 g/mol being used as the starch, the sum (a)+(b)+(c)+(d) being 100% and being based on the total solids content, and the polymerization being carried out in the presence of at least 0.01% by weight, based on the monomers used, of at least one terpene-containing chain-transfer agent, processes for the preparation of the finely divided, starch-containing polymer dispersions by emulsion polymerization of the monomers (a), (b) and (c) with redox initiators in the presence of (d) degraded starch and at least 0.01% by weight, based on the monomers used, of at least one terpene-containing chain-transfer agent, and use of the finely divided, starch-containing polymer dispersions as sizes for paper, board and cardboard.
Abstract:
The invention relates to finely divided starch-containing polymer dispersions, which can be obtained by the radically initiated emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein the ethylenically unsaturated monomers used are (a) 30 to 60% by weight of at least one optionally substituted styrol, (b) 1 to 60% by weight of at least one acrylic acid-C1-C12-alkyl ester and/or methacrylic acid-C1-C12-alkyl ester, (c) 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, and the starch used is (d) 15 to 40% by weight of at least one degraded starch having a molar mass Mw of 1000 to 65000 g/mol, wherein the sum (a) + (b) + (c) + (d) = 100% and relates to the total solid matter content, and wherein the polymerization is carried out in the presence of at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator. The invention further relates to a method for producing the finely divided starch-containing polymer dispersions by means of the emulsion polymerization of monomers (a), (b) and (c) using redox initiators in the presence of (d) degraded starch and at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator, and to the use of the finely divided starch-containing polymer dispersions as a sizing agent for paper, paperboard and cardboard.