Patent application number | Description | Published |
20080281049 | Process for Preparing Water-Absorbing Polymers with High Absorption Capacity and High Permeability - A process for preparing water-absorbing polymers by polymerizing a monomer solution comprising
| 11-13-2008 |
20090204087 | Superabsorbent Polymers Having Superior Gel Integrity, Absorption Capacity, and Permeability - Superabsorbent polymer particles having superior gel integrity, absorption capacity, and permeability are disclosed. A method of producing the superabsorbent polymer particles by applying a polyamine coating to the particles also is disclosed. | 08-13-2009 |
20100010461 | Polyamine Coated Superabsorbent Polymers Having Transient Hydrophobicity - Superabsorbent polymer particles having a transient hydrophobicity, excellent gel integrity, and free swell gel bed permeability are disclosed. A method of producing the superabsorbent polymer particles by applying a polyamine coating and a cosolvent to the particles also is disclosed. | 01-14-2010 |
20100063469 | Polyamine-Coated Superabsorbent Polymers - Superabsorbent polymer particles having superior absorption capacity and permeability are disclosed. A method of producing the superabsorbent polymer particles by applying a polyamine coating to the particles also is disclosed. | 03-11-2010 |
20100093949 | Superabsorbents Having Superior Permeability and Conveying Properties - A superabsorbent having superior permeability and conveying properties comprises a permeability enhancing agent and a cohesion control agent and has a free swell gel bed permeability of at least 15 Darcies and a Hausner ratio in the range of 1.18 to 1.34. | 04-15-2010 |
20100206897 | Process for Metering Superabsorbents - Superabsorbents are metered by a process using a screw conveyor, wherein the superabsorbent is selected, or treated with a cohesion control agent, to have an unconfined yield strength of from 0.75 to 1.5 kPa at consolidation stress of 6 kPa. | 08-19-2010 |
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 |
20100323885 | Process for Producing Re-Moisturised Surface-Crosslinked Superabsorbents - Re-moisturised, surface-crosslinked superabsorbents are produced using a process that comprises the steps of contacting a superabsorbent base polymer with an organic crosslinker and a polyvalent metal salt solution in the presence of an alcohol, heat-treating to produce a surface-crosslinked, dry superabsorbent and re-moisturising the surface-crosslinked dry superabsorbent. | 12-23-2010 |
20110001087 | Process for Preparing Superabsorbents - Superabsorbents are produced by polymerisation in a kneader equipped with at least two parallel shafts that also comprises elements on at least one shaft that transport the kneader's content parallel to the shafts from a feed section to a discharge section, the process comprising the addition of an inorganic powder to the kneader's contents prior to or during polymerisation and the addition of at least one other additive to the kneader's contents during polymerisation, wherein the inorganic powder is added no later than half the average residence time of the kneader's contents and the other additive is added no earlier than half this residence time. | 01-06-2011 |
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 |
20110118114 | COLOR STABLE SUPERABSORBENT - Superabsorbents comprising a compound of the formula (I) | 05-19-2011 |
20110121230 | Process for Producing Water-Absorbing Polymer Particles with Improved Color Stability - A process for producing water-absorbing polymer particles, wherein at least one aliphatic aldehyde or reaction product thereof with an aliphatic alcohol, an aliphatic amine, ammonia, a hypophosphite or a phosphite is added. | 05-26-2011 |
20110223413 | 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 coating the water-absorbing polymer particles with at least one sulfinic acid, sulfonic acid and/or salts thereof. | 09-15-2011 |
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 |
20110224381 | Process for Producing Water Absorbing Polymer Particles with Improved Color stability - A process for producing water-absorbing polymer particles, wherein at least one inorganic phosphoric acid and/or salt thereof and at least one organic 2-hydroxy acid and/or salt thereof is added, where the phosphorus in the inorganic phosphoric acid has an oxidation number of less than +V and the organic 2-hydroxy acid does not have any ethylenically unsaturated groups, and also the water-absorbing polymer particles obtainable by the process according to the invention. | 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 |
20110257340 | Process for Producing Water-Absorbing Polymer Particles - A process for producing water-absorbing polymer particles by polymerizing a monomer solution or suspension comprising an ethylenically unsaturated monomer bearing acid groups, an ethylenically unsaturated monomer, a crosslinker and an initiator. | 10-20-2011 |
20110303872 | Water-Absorbing Polymer Particles with Improved Color Stability - The invention relates to water-absorbing polymer particles with improved color stability and to processes for production thereof, wherein the water-absorbing polymer particles comprise at least one optical brightener. | 12-15-2011 |
20120074354 | METHOD FOR THE RESTABILIZATION OF (METH)ACRYLIC MONOMERS - A process for replacing the stabilization of (meth)acrylic monomers, wherein phenothiazine is removed from phenothiazine-containing (meth)acrylic monomers by adsorption on activated carbon, and then a moderately active polymerization inhibitor is optionally added. | 03-29-2012 |
20120091392 | Process for Producing Water-Absorbing Polymer Particles with Low Caking Tendency and High Absorption under Pressure - A process for producing water-absorbing polymer particles with low caking tendency and high absorption under pressure, comprising polymerization of a monomer solution or suspension, drying of the resulting polymer gel, grinding, classifying, thermal surface postcrosslinking and coating with silicon dioxide, wherein the water-absorbing polymer particles have been coated, before, during or after the surface postcrosslinking with aluminum cations. | 04-19-2012 |
20120178621 | Color-Stable Superabsorber - A superabsorbent produced by polymerizing a monomer mixture which comprises at least one ethylenically unsaturated monomer bearing at least one acid group, at least 0.1% by weight and at most 20% by weight, based on the total amount of ethylenically unsaturated monomers bearing at least one acid group (calculated as the free acid), of at least one alkaline earth metal salt (calculated without water of crystallization) selected from the salts of calcium, strontium or barium having been added before or during the polymerization and/or, if the polymerization is followed by a separate drying step, to the polymer before the drying, exhibits improved stability to discoloration in the course of storage under elevated temperatures and/or elevated air humidity. | 07-12-2012 |
20120202959 | Process for Producing Water-Absorbing Polymer Particles - A process for producing water-absorbing polymer particles with improved free swell rate by polymerizing a monomer solution or suspension comprising an ethylenically unsaturated monomer bearing acid groups, an ethylenically unsaturated monomer, a crosslinker and an initiator. | 08-09-2012 |
20130130895 | Superabsorbent Comprising Pyrogenic Aluminum Oxide - Superabsorbents comprising pyrogenic aluminum oxide exhibit a low caking tendency coupled with good absorption properties and rapid water absorption. | 05-23-2013 |
20130187089 | Process for Producing Water-Absorbing Polymer Particles with Low Caking Tendency and High Absorption under Pressure - A process for producing water-absorbing polymer particles with low caking tendency and high absorption under pressure, comprising polymerization of a monomer solution or suspension, drying of the resulting polymer gel, grinding, classifying, thermal surface postcrosslinking and coating with silicon dioxide, wherein the water-absorbing polymer particles have been coated, before, during or after the surface postcrosslinking with aluminum cations. | 07-25-2013 |
20130256593 | Color-Stable Superabsorbent - A superabsorbent obtainable by a process for producing superabsorbents by polymerizing a monomer solution comprising
| 10-03-2013 |
20130260032 | Process for Thermal Postcrosslinking in a Drum Heat Exchanger with an Inverse Screw Helix - A process for thermal surface postcrosslinking of water-absorbing polymer particles, wherein the polymer particles are coated with an aqueous solution, the coated polymer particles are deagglomerated and the deagglomerated polymer particles are thermally surface postcrosslinked by means of a drum heat exchanger with an inverse screw helix. | 10-03-2013 |
20130260988 | Color-Stable Superabsorbent - A superabsorbent having surfaces complexed with polyvalent metal ions and which contains at least one phosphonic acid derivative, and the molar ratio between polyvalent metal and phosphonic acid derivative is at most 1.2/n, where n is the number of phosphonic acid groups in the phosphonic acid derivative. The superabsorbent exhibits good stability against discoloration and a surprisingly low caking tendency without any significant impairment of its performance properties. | 10-03-2013 |
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 |