摘要:
Process for the production of paper, board and cardboard by draining a paper stock with sheet formation in the presence of a retention aid system comprising (i) at least one polymer comprising vinylamine units, in the form of the free bases, of the salts and/or in quaternized form, as the sole cationic polymer, (ii) at least one linear, anionic polymer having a molar mass Mw of at least 1 million and/or at least one branched, anionic, water-soluble polymer and/or bentonite and/or silica gel and (iii) at least one particulate, anionic, crosslinked, organic polymer having a mean particle diameter of at least 1 μm and an intrinsic viscosity of less than 3 dl/g, and use of the retention aid system comprising the components (i), (ii) and (iii) as an additive in the production of paper, board and cardboard.
摘要:
Process for the production of paper, board and cardboard by draining a paper stock with sheet formation in the presence of a retention aid system comprising (i) at least one polymer comprising vinylamine units, in the form of the free bases, of the salts and/or in quaternized form, as the sole cationic polymer, (ii) at least one linear, anionic polymer having a molar mass Mw of at least 1 million and/or at least one branched, anionic, water-soluble polymer and/or bentonite and/or silica gel and (iii) at least one particulate, anionic, crosslinked, organic polymer having a mean particle diameter of at least 1 μm and an intrinsic viscosity of less than 3 dl/g, and use of the retention aid system comprising the components (i), (ii) and (iii) as an additive in the production of paper, board and cardboard.
摘要:
Paper, board and cardboard are produced by adding (i) at least one retention aid and (ii) ionic, water-insoluble, uncrosslinked, organic microparticles which have an average particle size of less than 500 nm and a content of polymerized ionic monomers of less than 1% by weight or water-insoluble, uncrosslinked, organic microparticles having an average particle size of less than 500 nm and a content of polymerized ionic monomers of not more than 10% by weight, which are obtainable by polymerizing the monomers in the presence of silica, waterglass, bentonite and/or mixtures thereof, to a paper stock and draining the paper stock over a wire.
摘要:
A process for the production of a multilayer fiber web from cellulose fibers by separately feeding at least two different fiber suspensions and water into a multilayer headbox, in which they are separated by separating elements from one another and from water and, after leaving the nozzle mouth of the headbox, reach an apparatus on which a web is formed, the water being transported in such a way that, after emerging from the nozzle mouth, it reaches the web-forming apparatus in the form of a layer between two layers of fiber suspensions and thus counteracts mixing of the different fiber suspensions, wherein, for improving the retention, drainage and formation, at least one retention aid and/or at least one drainage aid are metered into the fiber suspensions and/or into the water fed in.
摘要:
Biocidal multilayered system, characterized in that it comprises at least the following layers: —an anionic or cationic carrier, preferably cellulose as anionic carrier, —on this carrier alternating polymeric cationic and anionic layers starting with a layer having a charge opposite to that of the carrier, —wherein at least one layer is hydrophobically modified.
摘要:
Aqueous dispersions of polymers which obtained by free radical suspension polymerization or free radical miniemulsion polymerization of ethylenically unsaturated monomers in an oil-in-water emulsion whose disperse phase comprises at least one fluorescent dye dissolved in at least one ethylenically unsaturated monomer and has an average particle diameter of at least 1μm, in the presence of at least one surface-active compound and at least 0.5% by weight, based on the monomers, of at least one hydrophobic, nonpolymerizable, organic compound, of a hydrophobic polymer of at least one C2- to C6-olefin having a molar mass Mw of up to 10000, of a siloxane having a molar mass Mw of up to 5000 and/or polystyrene having a molar mass Mw of up to 10000, and of the powders obtainable from these polymer dispersions in each case by drying and comprising at least one fluorescent dye for marking of materials.
摘要:
The use of solid materials based on synthetic polymers and/or biopolymers (A) in natural gas and mineral oil extraction technology. The solid materials are produced by solubilizing at least one synthetic polymer and/or biopolymer (A), or at least one synthetic polymer and/or biopolymer (A) and at least one additive (B), in at least one substantially anhydrous chaotropic liquid (C). The solution or dispersion (AC) or (ABC) is contacted with a liquid (D1) which is miscible with the chaotropic liquid (C), but in which at least the synthetic polymer and/or the biopolymer (A) are substantially insoluble, resulting in a phase (E). The chaotropic liquid (C) is removed from phase (E) to result in a gel (G), which is impregnated with a liquid (D2). The two liquids (D1) and (D2) are removed from the gel (G) by evaporating, producing a solid material based on synthetic polymer and/or biopolymer (A).
摘要:
The invention relates to polymer scaffolds suitable for producing artificial tissues, in particular polysaccharide scaffolds, to processes for their preparation, to their use for producing artificial tissues, and to artificial tissues produced on the basis of such polymer scaffolds.
摘要:
The use of solid materials based on synthetic polymers and/or biopolymers (A) in natural gas and mineral oil extraction technology. The solid materials are produced by solubilizing at least one synthetic polymer and/or biopolymer (A), or at least one synthetic polymer and/or biopolymer (A) and at least one additive (B), in at least one substantially anhydrous chaotropic liquid (C). The solution or dispersion (AC) or (ABC) is contacted with a liquid (D1) which is miscible with the chaotropic liquid (C), but in which at least the synthetic polymer and/or the biopolymer (A) are substantially insoluble, resulting in a phase (E). The chaotropic liquid (C) is removed from phase (E) to result in a gel (G), which is impregnated with a liquid (D2). The two liquids (D1) and (D2) are removed from the gel (G) by evaporating, producing a solid material based on synthetic polymer and/or biopolymer (A).
摘要:
Method for determining the size concentration, the particle size and the particle size distribution of natural and/or synthetic sizes in a paper stock by staining a sample of the particles (Ti) of the size with a fluorescent dye, light being radiated into the sample of fluorescent or fluorescently stained particles and scattered light and/or fluorescent light from the sample being recorded and evaluated, and use of this method for determining the particle size distribution of reactive size particles in the paper stock or in the white water of paper machines during papermaking.