The present invention provides: a novel water-absorbing agent, which exhibits an excellent absorption capacity under a load (AAP), gel layer liquid permeation rate under a load (FRUP), saline flow conductivity (SFC), and shape-maintaining property and ball burst strength (BBS) of a swollen water-absorbing agent aggregate, and excellent persistency of these effects for a long time. The water-absorbing agent, which comprises a polymer obtained by a process including the steps of polymerizing and then crosslinking a monomer including acrylic acid and/or a salt thereof, with the water-absorbing agent being characterized by: (1) exhibiting a free swelling capacity of not less than 23 g/g (GV), a gel deformation of not more than 12.5 cm under a short-time load (0.5 hrPT), and a gel deformation deterioration of not more than 3.5 cm under a load with the passage of time (ΔPT); (2) exhibiting a free swelling capacity of not less than 23 g/g (GV), a ball burst strength of not less than 80 gf (BBS), and a deterioration of ball burst strength of not more than 40% (DBBS); or (3) exhibiting a free swelling capacity of not less than 23 g/g (GV), an absorption capacity of not less than 20 g/g under a load of 4.9 kPa (AAP), and a gel deformation of not more than 12.5 cm under a load (16 hrPT).

Water-absorbing agent and production process therefor, and water-absorbent structure

An outer surface of a cold-storage container (or a refrigerant tube) is provided with a plurality of protrusion portions or recess portions. A cooling air passage, in which air flows to cool a space to be cooled in a cold storage time and in a cold release time of the cold storage material, is provided to contact a surface of the refrigerant tube on a side opposite to the cold storage container bonded to the refrigerant tube. The refrigerant tubes and the cold storage container form therebetween a cold-storage side air passage by the protrusion portions or the recess portions, such that air flows in the cold-storage side air passage separated from the cooling air passage. For example, the cold-storage side air passage is provided with a slanting space that causes condensed water or ice generated in the cold storage time to be drained along the cold-storage side air passage.

Cold storage heat exchanger

This invention relates to a method for producing a water-absorbing polymer, including the following steps: (i) mixing (α1) 0.1 to 99.999 wt%, preferably 20 to 98.99 wt%, and particularly preferably 30 to 98.95 wt% polymerizable, ethylenically unsaturated, acid-group-containing monomers or their salts, or polymerizable, ethylenically unsaturated, monomers containing a protonated or quaternized nitrogen atom, or their mixtures, wherein mixtures containing at least ethylenically unsaturated, acid-group containing monomers, preferably acrylic acid, are especially preferred; (α2) 0 to 70 wt%, preferably 1 to 60 wt%, and particularly preferably 1 to 40 wt% polymerized, ethylenically unsaturated, monomers that are copolymerizable with (α1); (α3) 0.001 to 10 wt%, preferably 0.01 to 7 wt%, and particularly preferably 0.05 to 5 wt% one or more cross-linking agent(s); (α4) 0 to 30 wt%, preferably 1 to 20 wt%, and particularly preferably 5 to 10 wt% water-soluble polymers; and (α5) 0 to 20 wt%, preferably 0.01 to 7 wt%, and particularly preferably 0.05 to 5 wt% one or more additive(s), wherein the total quantity by weight of (α1) to (α5) amounts to 100 wt%, (ii) radical polymerization while cross-linking, in order to form a water-insoluble, aqueous untreated hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sifting the water-absorbing polymer, (v) surface post-cross-linking the ground and sifted hydrogel polymer, and (vi) drying and processing the water-absorbing polymer, wherein, before the admixture of the initiator and the start of radical polymerization, 0.01 to 5 wt%, preferably 0.02 to 2wt%, and particularly preferably 0.07 to 1 wt% of at least one surfactant, relative to acrylic acid, from the group of non-ionic, ionic or amphoteric surfactants and, if required, 0.01 to 5 wt%, preferably 0.02 to 2 wt%, and particularly preferably 0.07 to 1 wt% foaming agent with a particle size of 10 µm to 900 µm, are added, relative to the water-absorbing polymer; method for producing a hydrogel polymer; the product obtained by this method; and use.

Super-absorbing polymers with rapid absorption properties and method for producing the same

The present invention relates to a preparation method of a superabsorbent polymer, and specifically to a method of preparing a superabsorbent polymer including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; classifying the milled hydrous gel phase polymer into two or more grades by particle size; adding a surface cross-linking agent to each hydrous gel phase polymer classified into two or more grades; and carrying out a surface cross-linking reaction of the hydrous gel phase polymer to which the surface cross-linking agent is added.

Preparation method of superabsorbent polymer

This invention relates to a method for producing a water-absorbing polymer, including the following steps: (i) mixing (α1) 0.1 to 99.999 wt % polymerizable, ethylenically unsaturated, acid-group-containing monomers; (α2) 0 to 70 wt % polymerized ethylenically unsaturated, monomers copolymerizable with (α1); (α3) 0.00 1 to 10 wt %, cross-linking agent(s); (α4) 0 to 30 wt % water-soluble polymers; and (α5) 0 to 20 wt % additive(s), wherein the total quantity by weight of (α1) to (α5) amounts to 100 wt %, (ii) radical polymerization while cross-linking, in order to form a hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sifting the water-absorbing polymer, (v) surface post-cross-linking the hydrogel polymer, and (vi) drying and processing the polymer, wherein, before the admixture of the initiator and the start of radical polymerization, 0.01 to 5 wt % of a surfactant, relative to acrylic acid, 0.01 to 5 wt % foaming agent, are added.

Superabsorbing polymers with rapid absorption properties and method for producing the same

PROBLEM TO BE SOLVED: To provide a method for producing a water absorbing polymer by carrying out aqueous solution polymerization in the presence of a surfactant, causing no reduction in water absorbing characteristics of the water absorbing polymer in a final product, having no problem of safety and to obtain a water absorbing polymer having excellent water absorbing characteristics free from problem of safety. SOLUTION: In this method for producing a water absorbing polymer by subjecting a monomer convertible to a water absorbing polymer by polymerization to aqueous solution polymerization, the polymerization is characteristically carried out in the presence of a polymerizable surfactant, preferably foams, to give the objective amorphous ground particle-like water absorbing polymer in which the surfactant is bonded to the polymer by a covalent bond. COPYRIGHT: (C)1999,JPO

Water absorbing polymer and its production

PROBLEM TO BE SOLVED: To obtain a water-absorbing agent that absorbs a large factor of water under no pressure or a pressure and shows excellent safety and high water absorption even when a resin concentration is increased in hygienic materials such as paper diaper by adding a vinyl compound and a polyhydric alcohol to a water-absorbing resin SOLUTION: (A) A water-absorbing resin is combined with (B) a vinyl compound (suitably vinyl ether, for example, triethylene glycol divinyl ether and (C) a polyhydric alcohol (for example, propylene glycol) In a preferred embodiment, when the component A bears carboxyl groups, 0001-10 ptswt of the component B and 0001-10 ptswt of the component C are added to 100 ptswt of the component A, in addition, for example, (D) a hydrophilic organic solvent such as isopropyl alcohol may be added thereto COPYRIGHT: (C)1999,JPO

Production of water-absorption agent

PROBLEM TO BE SOLVED: To provide an ashtray which has a high fire extinguishing capability, is excellent in sanitary view, and can save labor at the time of cleaning, and in addition, to provide a gel for fire extinguishment having an excellent fire extinguishing action and an excellent deodorizing action. SOLUTION: A specified net-like container for which a refractory material having a smaller specific density than water is bonded is attached to an ashtray. A gel for fire extinguishment containing a specified plant component, or a water-containing gel of a water-absorbent resin having a specified particle size distribution or a water-absorbent resin floating on the water surface is used as the gel for fire extinguishment. In addition, by making the gel for fire extinguishment having the excellent deodorizing action and the excellent fire-extinguishing action exist in the net-like container, the functionalities are increased. COPYRIGHT: (C)2006,JPO&NCIPI

Ashtray having fire extinguishing action, and gel for fire extinguishment

PROBLEM TO BE SOLVED: To provide a heat-storing body whose heat storage efficiency is improved by devising a shape for improving an execution property, increasing a filling rate and an area/weight ratio to the volume of the heat-storing body, and improving the flow behavior of a medium such as circulation water. SOLUTION: In the heat-storing body in a three-dimensional shape other than a sphere, a column, and a rectangular parallelepiped, the three-dimensional shape has at least one top section and a bottom surface, and the bottom surface is in circular, elliptic, or polygonal shape, and the area (S) of the bottom surface is 1-50 cm2.

Heat-storing body

PROBLEM TO BE SOLVED: To obtain a water-absorbing agent that absorbs a large factor of water under no pressure or a pressure and shows excellent safety and high water absorption even when a resin concentration is increased in hygienic materials such as paper diaper by adding a vinyl compound to a water-absorbing resin and treating the mixture with heat. SOLUTION: (A) A water-absorbing resin is combined with (B) a vinyl compound (suitably vinyl ether, for example, triethylene glycol divinyl ether) and they are heated at a temperature higher than 150°C. In a preferred embodiment, when the component A bears carboxyl groups, 0.001-10 pts.wt. of the component B is added to 100 pts.wt. of component A, in addition, for example, (C) a hydrophilic organic solvent such as isopropyl alcohol may be added thereto. COPYRIGHT: (C)1999,JPO

重則桐村

Papers

Water absorbing polymer and its production

Production of water-absorption agent

Ashtray having fire extinguishing action, and gel for fire extinguishment

Heat-storing body

Water-absorption agent composition and its production

重則 桐村

Papers

Water absorbing polymer and its production

Production of water-absorption agent

Ashtray having fire extinguishing action, and gel for fire extinguishment

Heat-storing body

Water-absorption agent composition and its production

重則桐村