Nippon Shokubai Patente

Provided is a water-absorbent resin that can sufficiently swell and gel by absorption of an aqueous liquid such as an antifreeze liquid even in a low-temperature environment, in which (a) a value of 0°C Vortex is 30 seconds or shorter, (b) a ratio of 0°C Vortex/30°C Vortex is 5 or less, (c) a GEX value is 17 or more, and (d) a value of CRC is a value exceeding 25 g/g.

[Problem] To provide a novel water-absorbent resin composition that can further improve the reduction of urine odor as compared with conventional water-absorbent resin compositions and can also suppress the recurrence of bad odors in a high temperature environment.[Solution] A water-absorbent resin composition includes a water-absorbent resin, a copper silicate, and a chelating agent.

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Provided is a technique capable of obtaining a water-absorbent resin in which the amount of contaminants mixed is further reduced when the water-absorbent resin is recovered from a mixture in which the water-absorbent resin and the contaminants such as pulp are fixed. A method for recovering a water-absorbent resin of the present invention includes, in the following order, a crushing step of crushing a mixture in which a water-absorbent resin and a contaminant are fixed and integrated, by applying a physical force to the mixture, and a separation step of separating the water-absorbent resin and the contaminant from the mixture crushed in the crushing step.

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An object of the present invention is to provide a novel method for producing a solubilized polymer obtained by decomposing a water-absorbent resin, which can shorten the decomposition time of the water-absorbent resin. A method for producing a solubilized polymer, including preparing a water-absorbent resin (A), which is a water-absorbent resin to be decomposed, and contacting the water-absorbent resin (A) with a decomposing agent, in which: (i) the contacting is performed in the presence of a water-absorbent resin (B), which is a water-absorbent resin having higher decomposability than the water-absorbent resin (A); or (ii) the contacting is performed in the presence of a decomposed product separately prepared by contacting a water-absorbent resin (B) with a decomposing agent, the water-absorbent resin (B) being a water-absorbent resin having higher decomposability than the water-absorbent resin (A).

The present application provides a method for producing an oligonucleotide, the method including: cleaving an oligonucleotide from a conjugate containing the oligonucleotide, a cleavable linker, and a support in a solution containing an alkylamine and an organic solvent; and optionally deprotecting a protecting group of the oligonucleotide, wherein the cleavable linker has a cyclic vicinal diol structure; and the organic solvent is selected from an ether, a cyclic amide, and a cyclic urea. According to the present production method, an oligonucleotide can be cleaved with high purity and yield from a conjugate containing the oligonucleotide, a cleavable linker, and a support by suppressing the generation of cleavable-linker-attached by-products and degradation products.

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Provided is a lipid nanoparticle that achieves sufficient lipid nanoparticle intake into a cell and is capable of efficiently achieving expression of a payload in the lipid nanoparticle. A lipid nanoparticle containing an amphiphilic compound, wherein the amphiphilic compound includes: (i) a site (I) containing a constituent unit (A) derived from a monomer (a) having two or more hydroxy groups in a molecule and having from 2 to 10 carbon atoms constituting a side chain among carbon atoms of the constituent unit; and (ii) a hydrocarbon group having 8 or more carbon atoms.

Provided is an electrode particularly excellent in air stability and electron injection properties, and an organic device including the electrode. The present invention relates to a thin film-modified electrode including: an electrode; and a layer containing at least one metal and an organic compound capable of coordinating to the at least one metal, the layer being in contact with the electrode, or both a layer containing at least one metal, the layer being in contact with the electrode, and a layer containing an organic compound capable of coordinating to the at least one metal, the layer being in contact with the layer containing at least one metal, the organic compound being a compound containing atoms capable of coordinating to metal and having a sum of distances from the atoms capable of coordinating to metal in the organic compound to an aluminum atom of 4.06 Å or less, as determined from a structure optimized by density functional theory calculations, where the aluminum atom is set as the metal, using functional: B3LYP/basis set: 6-31G**.

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Provided is a method for producing a solubilized polymer-containing material that makes it possible to efficiently decompose water-absorbent resins to efficiently produce the solubilized polymer-containing material, and provide a method for producing a water-absorbent resin in which a portion of the solubilized polymer-containing material is used as a raw material. The method for producing a solubilized polymer-containing material includes a heat treatment step of heat-treating a mixture (B) containing a water-absorbent resin (A), water, and a peroxide under conditions satisfying the following i) and ii), in which a mass average molecular weight (Mw) of a water-soluble content of a solubilized polymer-containing material (C) obtained in the heat treatment step is from 30000 to 1000000: i) a solid content concentration of the mixture (B) is 60 mass% or greater, and ii) a temperature of the heat treatment is 60°C or higher.

A particulate water-absorbing agent composition having a high caking resistance performance can be obtained without deteriorating water-absorbing performance under pressure by a method for producing a particulate water-absorbing agent composition, the method including, in at least one step selected from a monomer aqueous solution preparation step, a polymerization step, and an optional hydrogel grinding step, adding a water-soluble polyalkylene glycol having a mass-average molecular weight of 3000 or less in an amount of from 0.01 mass% to 0.25 mass% with respect to a total mass of monomers contained in the monomer aqueous solution, and after the surface crosslinking step, adding a nonionic polymer having a polyalkylene glycol chain in a structure and having a mass-average molecular weight of from 300 to 15000 in an amount of from 0.02 mass% to 0.40 mass% with respect to a water-absorbent resin that has been surface-crosslinked.

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