Patent application number | Description | Published |
20080202987 | Method for Grading a Particulate Water-Absorbing Resin - Process for classifying a particulate water-absorbing resin using a sieving apparatus at a reduced pressure compared with the ambient pressure and a sieving apparatus for classifying a particulate water-absorbing resin at a reduced pressure compared with the ambient pressure. | 08-28-2008 |
20080214750 | Method for Producing Water-Absorbing Polymers - The invention relates to processes for preparing water absorbing polymers by polymerization of a monomer solution comprising allyl acrylate and/or allyl alcohol, the solution comprising not more than 0.002% by weight of allyl acrylate and/or allyl alcohol, based on acrylic acid, to aqueous monomer solutions for producing water absorbing polymers, to water absorbing polymers, to processes for producing hygiene articles and also to hygiene articles. | 09-04-2008 |
20080227933 | Method For Producing Water-Absorbing Polymers - The invention relates to a process for preparing water-absorbing polymers by polymerizing a monomer solution, wherein the oxygen content of the monomer solution has been reduced by addition of at least one reducing agent before the polymerization. | 09-18-2008 |
20080306209 | Production of a Water-Absorbing Resin to Which a Particulate Additive is Admixed - The invention relates to a process for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and, if appropriate, at least one crosslinker in a reactor, which comprises admixing the reaction mixture with at least one first portion of a particulate additive before the reaction mixture has reached a residence time of 40% of the overall residence time in the reactor and with at least one second portion of a particulate additive when the reaction mixture has reached a residence time of 45% or more of the overall residence time in the reactor, the additive being selected from water-absorbing resin powders, fillers and mixtures thereof, the total solids content of monomer and additive being in the range from 30% to 60% by weight, the amount of additive being in the range from 5% to 50% by weight, based on the monomers, and the weight ratio of the first portion to the second portion of the additive being in the range from 10:1 to 1:5. The resin powder is recycled fine-sized material for example. Not only the residual monomer content, specifically the residual crosslinker content, but also the level of extractables in the water-absorbing resin are reduced by the method of addition described. A high fraction of additives can be incorporated without the properties of the water-absorbing resin obtained being adversely affected. The additives enter a sufficiently firm bond with the resin, so that no excessive dusting occurs on exposure to mechanical stress. | 12-11-2008 |
20090008220 | Use of an Apparatus for Adding at Least One Additive to a Reactor Interior - The invention relates to the use of an apparatus for adding at least one solid or viscous liquid additive, or an additive dispersed in solvent, to a reactor interior of a reactor for preparing crosslinked, finely divided polymers by copolymerizing
| 01-08-2009 |
20090192035 | Method for Producing Water-Absorbent Polymer Particles with a Higher Permeability by Polymerising Droplets of a Monomer Solution - A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein a water-insoluble inorganic salt is suspended in the monomer solution and the polymer beads have a mean diameter of at least 150 μm. | 07-30-2009 |
20090194462 | Method for Grading Water-Absorbent Polymer Particles - A process for classifying water-absorbing polymer beads, wherein screens having different mesh sizes are used before and after the postcrosslinking to remove the oversize. | 08-06-2009 |
20090239071 | Method for Producing Water-Absorbent Polymer Particles with a Higher Permeability by Polymerising Droplets of a Monomer Solution - A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution, comprising monomers bearing acid groups, in a gas phase surrounding the droplets, wherein the monomer solution comprises polyvalent cations and the polymer beads have a mean diameter of at least 150 μm. | 09-24-2009 |
20090258994 | Method for Producing Post-Cured Water-Absorbent Polymer Particles with a Higher Absorption by Polymerising Droplets of a Monomer Solution - A process for preparing postcrosslinked water-absorbing polymer beads with high absorption by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the solids content of the monomer solution is at least 35% by weight and the polymer beads have a mean diameter of at least 150 μm. | 10-15-2009 |
20090261023 | Method for the Classification of Water Absorbent Polymer Particles - A process for continuously classifying water-absorbing polymer beads by means of at least one screen, at least one screen having at least one guide device on the screen surface. | 10-22-2009 |
20090266747 | Method for Grading Water-Absorbent Polymer Particles - A process for classifying water-absorbing polymer beads, wherein the polymer beads are separated into n particle size fractions by means of at least n screens and n is an integer greater than 1. | 10-29-2009 |
20090321664 | Method for the Continuous Production of Water-Absorbent Polymer Particles - A process for continuously preparing water-absorbing polymer beads by determining at least one particulate delivery material mass flow by means of incident electromagnetic waves. | 12-31-2009 |
20100016522 | Method for the Continuous Production of Water Absorbent Polymer Particles - A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying. | 01-21-2010 |
20100019198 | Method for Producing Mechanically Stable Water-Absorbent Polymer Particles - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets and postcrosslinking the polymer particles, wherein the postcrosslinked polymer particles are at least partly coated. | 01-28-2010 |
20100041550 | Method for Producing White and Color-Stable Water-Absorbing Polymer Particles Having High Absorbency and High Saline Flow Conductivity - Water-absorbing polymeric particles are produced by polymerizing a monomer solution or suspension comprising at least one unsaturated carboxylic acid and at least one hydroquinone monoether, and coating the polymeric particles with at least one salt of a tervalent metal cation of a carboxylic acid and/or at least one basic salt of a tervalent metal cation. | 02-18-2010 |
20100068520 | Method for Producing Water-Absorbent Polymer Particles with a Higher Permeability by Polymerising Droplets of a Monomer Solution - A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the monomer solution comprises at least 0.5% by weight of a crosslinker, based on the monomer, the polymerization in the droplet takes place in homogeneous phase, and the polymer beads have a mean diameter of at least 150 μm. | 03-18-2010 |
20100261604 | Process for Producing Surface Crosslinked Superabsorbents - Surface-crosslinked superabsorbents are produced using a process that comprises the steps of contacting a superabsorbent base polymer with a polyvalent metal salt solution produced by dissolving at least two different polyvalent metal salts, at least one of which comprises a chelate-forming anion, and heat-treating to produce a surface-crosslinked superabsorbent. | 10-14-2010 |
20100294988 | Method for Producing Mechanically Stable Water-Absorbent Polymer Particles - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the particle surface is coated at least partly with at least one polymer and/or wax. | 11-25-2010 |
20100324212 | Production of a Water-Absorbing Resin to Which a Particulate Additive is Admixed - The invention relates to a process for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and, if appropriate, at least one crosslinker in a reactor, which comprises admixing the reaction mixture with at least one first portion of a particulate additive before the reaction mixture has reached a residence time of 40% of the overall residence time in the reactor and with at least one second portion of a particulate additive when the reaction mixture has reached a residence time of 45% or more of the overall residence time in the reactor, the additive being selected from water-absorbing resin powders, fillers and mixtures thereof, the total solids content of monomer and additive being in the range from 30% to 60% by weight, the amount of additive being in the range from 5% to 50% by weight, based on the monomers, and the weight ratio of the first portion to the second portion of the additive being in the range from 10:1 to 1:5. The resin powder is recycled fine-sized material for example. Not only the residual monomer content, specifically the residual crosslinker content, but also the level of extractables in the water-absorbing resin are reduced by the method of addition described. A high fraction of additives can be incorporated without the properties of the water-absorbing resin obtained being adversely affected. The additives enter a sufficiently firm bond with the resin, so that no excessive dusting occurs on exposure to mechanical stress. | 12-23-2010 |
20110042612 | Method for Producing White and Color-Stable Water-Absorbing Polymer Particles Having High Absorbency and High Saline Flow Conductivity - Water-absorbing polymeric particles are produced by polymerizing a monomer solution or suspension comprising at least one unsaturated carboxylic acid, at least one hydroquinone monoether and at least one inorganic peroxide and coating the polymeric particles with at least one basic salt of a bivalent metal cation. | 02-24-2011 |
20110059329 | Water-Absorbent Polymer Particles - The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores. | 03-10-2011 |
20110105707 | Method for the Production of Water-Absorbing Polymer Articles by Polymerizing Drops of a Monomer Solution - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the monomer solution comprises at least | 05-05-2011 |
20110111231 | METHOD FOR PRODUCING WATER-ABSORBING POLYMER PARTICLES BY POLYMERIZING DROPLETS OF A MONOMER SOLUTION - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase in a reaction chamber, wherein the monomer solution is metered into the reaction chamber via at least one bore, and the diameter is from 210 to 290 μm per bore and the metering rate is from 0.9 to 5 kg/h per bore. | 05-12-2011 |
20110112252 | Method for Post-Crosslinking of the Surface of Water-Absorbing Polymer Particles - A process for thermally surface postcrosslinking water-absorbing polymer particles in a fluidized bed generated by means of a carrier gas, wherein the surface postcrosslinker is supplied to the fluidized bed in gaseous form. | 05-12-2011 |
20110118419 | Method for the Surface Post-Crosslinking of Water Absorbing Polymer Particles - A process for producing water-absorbing polymer particles, wherein the water-absorbing polymer particles are surface postcrosslinked with unsaturated fatty acids or derivatives thereof. | 05-19-2011 |
20110224361 | METHOD FOR PRODUCING PERMEABLE WATER-ABSORBING POLYMER PARTICLES THROUGH POLYMERIZATION OF DROPS OF A MONOMER SOLUTION - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the polymer particles are coated with a permeability improver. | 09-15-2011 |
20110237754 | Process for Producing Water-Absorbent Polymer Particles by Polymerizing Droplets of a Monomer Solution - The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises thermal postcrosslinking in the presence of steam. | 09-29-2011 |
20120058267 | Coating Process for Water-Absorbing Polymer Particles - A coating process wherein an aqueous liquid is sprayed onto surface postcrosslinked water-absorbing polymer particles in a horizontal mixer and the inner wall of the horizontal mixer which is in contact with the product is made from a stainless steel. | 03-08-2012 |
20120071613 | Mixing Kneader and Process for Preparing Poly(Meth)Acrylates Using the Mixing Kneader - The invention relates to a mixing kneader comprising at least two shafts ( | 03-22-2012 |
20120141792 | Method for Producing Post-Cured Water-Absorbent Polymer Particles with a Higher Absorption by Polymerizing Droplets of a Monomer Solution - A process for preparing postcrosslinked water-absorbing polymer beads with high absorption by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein the solids content of the monomer solution is at least 35% by weight and the polymer beads have a mean diameter of at least 150 μm. | 06-07-2012 |
20120184673 | Use of an Apparatus for Adding at Least One Additive to a Receptor Interior - The invention relates to the use of an apparatus for adding at least one solid or viscous liquid additive, or an additive dispersed in solvent, to a reactor interior of a reactor for preparing crosslinked, finely divided polymers by copolymerizing
| 07-19-2012 |
20130098809 | Method for Grading Water-Absorbent Polymer Particles - A process for classifying water-absorbing polymer beads, wherein the polymer beads are separated into n particle size fractions by means of at least n screens and n is an integer greater than 1. | 04-25-2013 |
20130276325 | Method for the Continuous Production of Water Absorbent Polymer Particles - A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying. | 10-24-2013 |
20130281594 | WATER-ABSORBENT POLYMER PARTICLES - The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores. | 10-24-2013 |
20140038817 | METHOD FOR PRODUCING WATER-ABSORBING POLYMER PARTICLES BY POLYMERIZING DROPLETS OF A MONOMER SOLUTION - A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase in a reaction chamber, wherein the monomer solution is metered into the reaction chamber via at least one bore, and the diameter is from 210 to 290 μm per bore and the metering rate is from 0.9 to 5 kg/h per bore. | 02-06-2014 |
20140302321 | METHOD FOR PRODUCING WATER-ABSORBENT POLYMER PARTICLES WITH A HIGHER PERMEABILITY BY POLYMERIZING DROPLETS OF A MONOMER SOLUTION - A process for preparing water-absorbing polymer beads with high permeability by polymerizing droplets of a monomer solution in a gas phase surrounding the droplets, wherein a water-insoluble inorganic salt is suspended in the monomer solution and the polymer beads have a mean diameter of at least 150 μm. | 10-09-2014 |