Abstract: A diverting agent and method for temporarily filling fractures. The diverting agent contains a powder-like polyvinyl alcohol-based resin (P1) and a pellet-like polyvinyl alcohol-based resin (P2), and has an adsorption coefficient kc of 0.01 or more and 1 or less.

Abstract: An object of the present invention is to provide a diverting agent having an excellent filling property against various fractures. The diverting agent of the present invention contains a powder-like polyvinyl alcohol-based resin (P1) and a pellet-like polyvinyl alcohol-based resin (P2), and has an adsorption coefficient kc of 0.01 or more and 1 or less, which is obtained by a method including steps (i) to (iii). (The steps (i) to (iii) are the same as those described in the description.

Abstract: A diverting agent of the present invention contains a polyvinyl alcohol-based resin, wherein when the diverting agent is added to a 0.48 mass % aqueous solution of guar gum to prepare a mixed solution having a concentration of 12 mass %, a dispersion liquid obtained by dispersing the mixed solution at 30° C.

Abstract: A diverting agent of the present invention contains a polyvinyl alcohol-based resin, wherein when the diverting agent is added to a 0.48 mass % aqueous solution of guar gum to prepare a mixed solution having a concentration of 12 mass %, a dispersion liquid obtained by dispersing the mixed solution at 30° C.

Abstract: A laminate shaping support material is provided which includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J/g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Abstract: A laminate shaping support material is provided which includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J/g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Abstract: Provided is a liquid spray agent for agricultural use, including a polyvinyl alcohol-based resin having a saponification degree of from 30 mol %, to 60 mol %. With this, a liquid spray agent for agricultural use, which is used in agricultural and horticultural fields and has high fixation ability and excellent sprayability, can be provided.

Abstract: An object of the present invention is to improve the water dispersibility of the PVA-based resin and also to suppress the swelling of the PVA-based resin. The object is achieved by organic-inorganic composite particles, which have an average particle size of preferably 1 ?m to 3,000 ?m, including a polyvinyl alcohol-based resin and a component having a three-dimensional siloxane crosslinked structure that is derived from a hydrolysis-polycondensation product of an alkoxysilane and/or a low condensate thereof, wherein the alkoxysilane includes a T unit and/or a Q unit as a structural unit (s), and a Si content with respect to a total weight of the composite particles is 0.1 wt % or more and 23 wt % or less in terms of SiO2.

Abstract: A cement admixture includes a crosslinked product of a modified polyvinyl alcohol-based resin, wherein the dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less.

Abstract: A laminate shaping support material is provided which includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J/g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Abstract: A liquid spray agent for plants includes: a polyvinyl alcohol resin (A) having a saponification degree of from 30 mol % to 60 mol %; and an anionic surfactant (B). The liquid spray agent for plants has enhanced spreading property and stability as a spray agent.

Abstract: A laminate shaping support material is provided which includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J/g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Abstract: An object of the present invention is to improve the water dispersibility of the PVA-based resin and also to suppress the swelling of the PVA-based resin. The object is achieved by organic-inorganic composite particles, which have an average particle size of preferably 1 ?m to 3,000 ?m, including a polyvinyl alcohol-based resin and a component having a three-dimensional siloxane crosslinked structure that is derived from a hydrolysis-polycondensation product of an alkoxysilane and/or a low condensate thereof, wherein the alkoxysilane includes a T unit and/or a Q unit as a structural unit (s), and a Si content with respect to a total weight of the composite particles is 0.1 wt % or more and 23 wt % or less in terms of SiO2.

Abstract: Conventional methods suffer from unsatisfactory performance of the dehydration-preventing agent at a high temperature, and the present invention provides a cement admixture exhibiting an excellent dehydration-preventing effect at a high temperature. The cement admixture of the present invention includes a crosslinked product of a modified polyvinyl alcohol-based resin, wherein the dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less.

Abstract: Disclosed is a dispersing agent for agrochemicals, said dispersing agent which comprises a modified polyvinyl alcohol-based resin containing a structural unit having a nonionic hydrophilicity group in side chain, and having a saponification degree of 95 mol % or more. The dispersing agent for agrochemicals can provide a dispersion in which a hardly water-soluble agrochemical active ingredient employed for a dispersoid is dispersed in a stable state even in the case where the dispersoid has a relatively large particle size.

Abstract: A drilling fluid adjusting agent using a PVA-based resin capable of contributing to the reduction of hydration swelling of bentonite even in the presence of salts; and a drilling fluid using the same are provided. The drilling fluid adjusting agent contains a PVA containing 1,2-diol structural unit in a side chain thereof. The drilling fluid adjusting agent has excellent solubility even in the presence of salts such as potassium ion, and also has excellent reduction of hydration swelling of bentonite.

Abstract: An object of the invention is to provide a crosslinking agent with which a crosslinked polymer that suffers little coloring with the lapse of time and shows excellent viscosity stability is obtained. The crosslinking agent of the invention includes a compound which contains two or more alkylhydrazide groups represented by the following general formula (1). (In formula (1), R1 represents an alkyl group having 1-10 carbon atoms, and symbol * is a linking bond.

Abstract: Disclosed is a dispersing agent for agrochemicals, said dispersing agent which comprises a modified polyvinyl alcohol-based resin containing a structural unit having a nonionic hydrophilicity group in side chain, and having a saponification degree of 95 mol % or more. The dispersing agent for agrochemicals can provide a dispersion in which a hardly water-soluble agrochemical active ingredient employed for a dispersoid is dispersed in a stable state even in the case where the dispersoid has a relatively large particle size.

Abstract: A laminate-shaping support material includes one of: a resin composition containing a polyvinyl alcohol resin having a primary hydroxyl group at its side chain, and having a heat of fusion of 10 to 30 J/g at its melting point (Embodiment (X)); and a resin composition containing a polyvinyl alcohol resin, and a block copolymer including a polymer block of an aromatic vinyl compound, at least one of a polymer block of a conjugated diene compound and a block of a hydrogenated conjugated diene compound, and a functional group reactive with a hydroxyl group (Embodiment (Y)). Therefore, the laminate shaping support material according to Embodiment (X), for example, is excellent in shape stability and adhesiveness to a model material. The laminate shaping support material according to Embodiment (Y) is excellent in peelability and forming stability.

Abstract: A drilling fluid adjusting agent using a PVA-based resin capable of contributing to the reduction of hydration swelling of bentonite even in the presence of salts; and a drilling fluid using the same are provided. The drilling fluid adjusting agent contains a PVA containing 1,2-diol structural unit in a side chain thereof. The drilling fluid adjusting agent has excellent solubility even in the presence of salts such as potassium ion, and also has excellent reduction of hydration swelling of bentonite.