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Dairoku
Yorimichi Dairoku, Okayama JP
| Patent application number | Description | Published |
|---|---|---|
| 20100101982 | CLASSIFICATION METHOD OF PARTICULATE WATER ABSORBENT RESIN - A particulate water absorbent resin is obtained by polymerizing an unsaturated monomer so as to form a cross-linked polymer hydrogel and drying and pulverizing the cross-linked polymer hydrogel, and plural classification steps different from each other are carried out so as to remove fine powder. In this manner, the present invention provides the method for classification of particulate water absorbent resin which method allows particulate water absorbent resin having a desired particle diameter range to be efficiently obtained at low cost while securing the high productivity even in case where a larger production equipment is used. | 04-29-2010 |
| 20100249320 | Process for producing water-absorbing resin - Drying is performed in a continuous fluidized bed having at least two drying rooms. Drying is performed after pulverization is performed between drying in a first drying room and drying in a second or subsequent room. Drying is performed in a continuous fluidized bed whose fluidized bed contains a heat transfer tube. The second or subsequent drying room has a higher drying temperature than the first drying room. Drying is performed with the drying temperature of the first drying room falling within a range of not less than 80° C. to not more than 200° C. and with the drying temperature of the second or subsequent drying room falling within a range of not less than 100° C. to not more than 220° C. Further, a method for producing a water absorbent resin includes: a sequence of the steps of: (1) polymerizing a monomer aqueous solution; (2) drying a hydrogel polymer obtained in the step (1); (3) performing particle size control by either pulverizing or pulverizing and classifying a dry polymer obtained in the step (2); and (5) performing surface crosslinking on water absorbent resin powder whose particle size has been controlled in the step (3), the method further including the step (4) of performing second heat drying on the water absorbent resin powder whose particle size has been controlled in the step (3), the step (4) preceding the step (5). Further, the water absorbent resin has a moisture content (defined by a loss on drying performed for three hours at 180° C.) of 0 wt % to 3 wt % before it is supplied to the step (5). (This makes it possible to provide a method for producing a water absorbent resin which method makes it possible to obtain a particulate water absorbent resin of excellent properties at low cost with high productivity. | 09-30-2010 |
| 20110021725 | Production method and production apparatus of particulate water absorbing agent containing water absorbent resin as main component - An apparatus ( | 01-27-2011 |
Yorimichi Dairoku, Himeji-Shi JP
| Patent application number | Description | Published |
|---|---|---|
| 20080269372 | Particulate water absorbent agent and production method thereof, and water absorbent article - A particulate water absorbing agent of the present invention includes a water absorbent resin, having a cross-linking structure, whose surface has been cross-linked by adding a surface treatment agent, wherein: (i) a mass average particle diameter (D50) ranges from 200 to 600 μm and 95 to 100 wt % of a particulate water absorbing agent whose particle diameter ranges from less than 850 μm to not less than 150 μm is contained with respect to 100 wt % of whole the particulate water absorbing agent, and (ii) a logarithmic standard deviation (σζ) of particle size distribution ranges from 0.25 to 0.45, and (iii) a compressibility rate defined by a following equation ranges from 0 to 18%, and (iv) a surface tension of a supernatant liquid obtained in 4 minutes after dispersing 0.5 g of the particulate water absorbing agent in 50 ml of physiological saline whose temperature is 20° C. is 55 mN/m or more, | 10-30-2008 |
| 20100222758 | Water-absorbent resin, hydropolymer, process for producing them, and uses of them - The present invention provides a production process by which a water-absorbent resin of excellent quality can be obtained at a low cost by reasonable steps in aqueous solution polymerization. The process for producing a water-absorbent resin comprises the step of polymerizing an aqueous solution of water-absorbent resin-forming monomers including acrylic acid and/or its sodium salt as major components, wherein: (1) the aqueous solution has a monomer component concentration of not less than 45 weight %; (2) the polymerization is carried out while water is evaporated so that the ratio (concentration ratio) between a solid component concentration in a hydropolymer as formed by the polymerization and a solid component concentration in the aqueous monomer solution will not be less than 1.10; and (3) the solid component concentration in the hydropolymer as formed by the polymerization is not more than 80 weight %. | 09-02-2010 |
| 20100308263 | WATER ABSORBENT AND PRODUCING METHOD OF SAME - An object of the present invention is to provide a water absorbent having excellent gel properties and showing excellent properties when used in a water-absorbing material of a sanitary/hygienic material such as paper diaper. Moreover, another object of the present invention is to provide a water absorbent which is safe and excellent in liquid permeability, and in which an amount of liquid permeability improver for improving the liquid permeability is reduced. The water absorbent is made from a water-absorbing resin prepared by a specific polymerization method and having a high degree of cross-linking, a high liquid holding property and a high gel strength (its swelling pressure of gel layer of is 35 kdyne/cm2 or more). This water absorbent is further processed to have a particular particle size distribution (95 wt % or more of its particles are less than 850ƒÊm but not less than 106ƒÊm, and logarithmic standard deviation (ƒĐƒÄ) is in a range of 0.25 to 0.45) and then surface cross-linked. After that, a liquid permeability improver is added therein. | 12-09-2010 |
Yorimichi Dairoku, Hyogo JP
| Patent application number | Description | Published |
|---|---|---|
| 20090318885 | Particulate Water Absorbing Agent Including Polyacrylic Acid (Polyacrylate) Based Water Absorbing Resin as a Principal Component, Method for Production Thereof, Water-Absorbent Core and Absorbing Article in Which the Particulate Water Absorbing Agent is Used - As a characteristic that had not been known conventionally at all, “permeability potential under pressure (PPUP)” of a particulate water absorbing agent is regulated, and further, “range of particle size distribution” and “coloring” are concomitantly regulated. The present invention is directed to a particulate water absorbing agent having the following (a) to (c): | 12-24-2009 |
| 20110166300 | WATER-ABSORBENT RESIN MANUFACTURING METHOD AND LIQUID PERMEABILITY IMPROVEMENT METHOD - A method for the production of a water-absorbing resin is to be provided which permits enhancement and stabilization of property, for example, liquid permeability, of a water-absorbing resin by a simple and convenient method without requiring change of raw materials or expensive facility investment. The method comprises a polymerization step for polymerizing an aqueous solution of acrylic acid (or salt thereof) to obtain a hydrogel cross-linked polymer; a drying step for drying the hydrogel cross-linked polymer to obtain a water-absorbing resin powder; a classification step for classifying the water-absorbing resin powder; and a surface cross-linking step for surface cross-linking the water-absorbing resin powder before or after the classification step, wherein electricity is eliminated in the classification step. | 07-07-2011 |