Abstract:
A process and device for producing finely divided liquid-liquid formulations comprise (a) a screen with at least one inlet nozzle and a screen with at least one outlet nozzle, a static mixer being located in the space between the screens, into which additional energy is mechanically introduced, if necessary, or (b) a screen with at least one inlet nozzle and a baffle plate, a static mixer being located, if necessary, in the space between the screen and the baffle plate, and/or energy being mechanically introduced therein.
Abstract:
The invention relates to a paper sizing agent comprising a stable aqueous dispersion of a reactive sizing agent, 5 to 100 % by weight, with regard to the reactive sizing agent, of an essentially linear nitrogen-containing polymer with at least 3 mmol/g of basic nitrogen atoms, and 1 to 50 % by weight of cationic starch with a degree of substitution of at least 0.05. The paper sizing agent exhibits a good sizing effect and has a constant viscosity.
Abstract:
The invention relates to fine-particle, cationic polymer dispersions that can be obtained by emulsion polymerisation of ethylenically unsaturated mon omers in an aqueous solution of a cationic pre-polymer as a dispersant. Firs t, a cationic pre-polymer is produced by the polymerisation of: a) between 1 0 and 45 wt. % of at least one (meth)acrylic acid ester comprising an amino group and/or a quarternary ammonium group, and/or a (meth)acrylic amide, car rying an amino group and/or a quaternary ammonium group, b) between 40 and 8 5 wt. % of at least one optionally substituted styrol, c) between 0 and 20 w t. % of acrylic nitrile or methacrylic nitrile, d) between 1 and 15 wt. % of at least one ethylenically unsaturated carboxylic acid or an ethylenically unsaturated carboxylic acid anhydride, and e) between 0 and 20 wt. % of at l east one non-ionic, ethylenically unsaturated monomer different from the mon omers (b) and (c), the sum of (a) + (b) + (c) + (d) + (e) amounting to 100 w t. %, in a solution polymerisation in an organic solvent that can be mixed w ith water. The solution of the pre-polymer produced in this way is diluted w ith water, and then an emulsion polymerisation of a monomer mixture of: i) b etween 30 and 80 wt. % of acrylic nitrile and/or methacrylic nitrile, ii) be tween 5 and 50 wt. % of at least one C1 to C4 alkyl acrylate or at least one C1 to C4 alkyl methacrylate, iii) between 5 and 50 wt. % of at least one C6 to C14 alkyl acrylate or at least one C6 to C14 alkyl methacrylate, and iv) between 0 and 20 wt. % of a non-ionic monomer diferent from the monomers (i ), (ii) und (iii), the sum of (i) + (ii) + (iii) + (iv) amounting to 100 wt. %, is carried out in the aqueous solution of the pre-polymer, in the presen ce of water-soluble polymerisation inhibitors. The invention also relates to the use of the fine-particle cationic polymer dispersions obtained in this way as materials and surface sizing agents for paper, paperboard and cardboa rd.
Abstract:
Aqueous alkenylsuccinic anhydride-containing polymer dispersions which are obtainable by miniemulsion polymerization of hydrophobic monoethylenically unsaturated monomers in the presence of alkenylsuccinic anhydrides, processes for the preparation of such polymer dispersions by polymerizing hydrophobic monomers by a miniemulsion polymerization method in the presence of at least one alkenylsuccinic anhydride and, if appropriate, an alkyldiketene, and use of the resulting aqueous alkenylsuccinic anhydride-containing polymer dispersions as engine and surface sizes for paper and for imparting water repellency to leather, natural and/or synthetic fibers and textiles.
Abstract:
Process for producing finely divided liquid-liquid formulations and apparatus for producing the same, comprising a) a baffle having at least one inlet nozzle and a baffle having at least one outlet nozzle, the nozzles being arranged axially with respect to one another, a static mixer being located in the space between the baffles, and there being, additionally, if appropriate, mechanical introduction of energy, or b) a baffle having at least one inlet nozzle and an impingement plate, there being, if appropriate, in the space between the baffle and the impingement plate a static mixer and/or mechanical introduction of energy.
Abstract:
Finely divided, starch-containing polymer dispersions which are obtainable by free radical emulsion copolymerization of (a) from 25 to 50% by weight of at least one optionally substituted styrene, methyl methacrylate, acrylonitrile and/or methacrylonitrile, (b) from 1 to 49% by weight of at least one C1-C4-alkyl acrylate and/or one C2-C4-alkyl methacrylate, (c) from 1 to 49% by weight of at least one C5-C22-alkyl acrylate and/or one C5-C22-alkyl methacrylate and (d) from 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer and (e) from 15 to 40% by weight of a degradable starch which has a molar mass Mw of from 1000 to 65 000 the sum (a)+(b)+(c)+(d)+(e) being 100% and being based on the total solids content, in the presence of redox initiators and at least 0.01% by weight, based on the monomers used, of at least one polymerization regulator, processes for the preparation of the finely divided, starch-containing polymer dispersions by emulsion polymerization of the monomers (a), (b), (c) and (d) with redox initiators in the presence of (e) degraded starch and at least 0.01% by weight, based on the monomers used, of at least one polymerization regulator, and use of the finely divided, starch-containing polymer dispersions as sizes for paper, board and cardboard.
Abstract:
The invention relates to a paper sizing agent comprising a stable aqueous dispersion of a reactive sizing agent, 5 to 100 % by weight, with regard to the reactive sizing agent, of an essentially linear nitrogen-containing polymer with at least 3 mmol/g of basic nitrogen atoms, and 1 to 50 % by weight of cationic starch with a degree of substitution of at least 0.05. The paper sizing agent exhibits a good sizing effect and has a constant viscosity.
Abstract:
A paper size which comprises a stable aqueous dispersion of a reactive size, from 5 to 100% by weight, based on the reactive size, of a substantially linear nitrogen-comprising polymer having at least 3 mmol/g of basic nitrogen atoms, and from 1 to 50% by weight of cationic starch having a degree of substitution of at least 0.05 is described. The paper size has a good sizing effect and a stable viscosity.
Abstract:
The invention relates to aqueous polymer dispersions containing alkenyl succinic acid anhydrides. Said polymer dispersions can be obtained by miniemulsion polymerisation of hydrophobic monoethylenically unsaturated monomers in the presence of alkenyl succinic acid anhydrides. The invention also relates to methods for producing such polymer dispersions by polymerisi ng hydrophobic monomers according to a miniemulsion polymerisation in the presence of at least one alkenyl succinic acid anhydride, and optionally one alkyl diketene. The invention further relates to the use of the aqueous polymer dispersions containing alkenyl succinic acid anhydrides obtained in this way, as pulp and surface sizing agents for paper, and for hydrophobing leather, natural and/or synthetic fibres, and textiles.
Abstract:
Aqueous alkenylsuccinic anhydride-containing polymer dispersions which are obtainable by miniemulsion polymerization of hydrophobic monoethylenically unsaturated monomers in the presence of alkenylsuccinic anhydrides, processes for the preparation of such polymer dispersions by polymerizing hydrophobic monomers by a miniemulsion polymerization method in the presence of at least one alkenylsuccinic anhydride and, if appropriate, an alkyldiketene, and use of the resulting aqueous alkenylsuccinic anhydride-containing polymer dispersions as engine and surface sizes for paper and for imparting water repellency to leather, natural and/or synthetic fibers and textiles.