Abstract: There is provided a novel crosslinking agent for use in crosslinked polymer fabrication, specifically a crosslinking agent containing at least one compound selected from glyoxylate and a glyoxylic acid ester derivative represented by the following general formula (1): wherein R1 and R2 each independently represents an alkyl group having 1 to 10 carbon atoms and R3 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

Abstract: An aqueous synthetic resin emulsion comprises a synthetic resin comprising a copolymer of at least one monomer (A) selected from an acrylic monomer and a styrene monomer, and at least one functional group-containing monomer (B) selected from the group consisting of: (B1) a glycidyl-containing monomer; (B2) an allyl-containing monomer; (B3) a hydrolyzable silyl-containing monomer; (B4) an acetoacetyl-containing monomer; (B5) a monomer having at least two vinyl groups in a molecular structure thereof; and (B6) a hydroxyl-containing monomer, the synthetic resin being stably dispersed in the emulsion in the presence of a polyvinyl alcohol resin [I] having an average saponification degree of not less than 85 mol % and an average polymerization degree of 50 to 3000 and having 1 to 15 mol % 1,2-diol bonds on its side chains. The aqueous synthetic resin emulsion may be used for a cement mortar admixture, yielding a mortar excellent in fluidity and workability.

Abstract: The present invention relates to a water-soluble film, which is a polyvinyl alcohol film comprising a polyvinyl alcohol resin (A), wherein the water-soluble film has a time for dissolution in water at 20° C. of not more than 60 seconds in terms of a film thickness of 76 ?m, a b-value of the film is not more than 0.5, and a b-value of the film after leaving at 80° C. for 72 hr is not more than 1.0, preferably a water-soluble film comprising: a polyvinyl alcohol resin (A); at least two kinds of plasticizers (B); and a sulfite salt (C), wherein the content of the plasticizer (B) based on 100 parts by weight of the polyvinyl alcohol resin (A) is 5 to 50 parts by weight and the content ratio of the sulfite salt (C) to the plasticizer (B) (C/B: weight ratio) is more than 0.02 and not more than 0.35.

Abstract: The present invention discloses a method for production of a stretched multilayer film obtained by stretching a multilayer structure comprising a layer containing (A) side chain 1,2-diol-modified vinyl alcohol-based resin and a layer containing (B) thermoplastic resin having a melting point of 125 to 300° C. laminated on each other through a layer of (C) adhesive resin. The method enables to produce a stretched multilayer film which shows excellent appearance even when the film is stretched at a high stretching magnitude. In the method, the (C) adhesive resin employs a thermoplastic resin having a melting point higher than the stretching temperature of the multilayer film, and therefore, a stretched multilayer film having the above-mentioned structure and having excellent appearance can be produced.

Abstract: An ethylene-vinyl alcohol copolymer (EVOH) solution is introduced into a tower vessel (1) from a first inlet (2) provided at an upper portion of the tower vessel (1). Water vapor is introduced into the tower vessel (1) from a second inlet (3) provided at a lower portion of the vessel (1). The EVOH solution moves downward in the vessel (1), while the water vapor moves upward. The EVOH solution is kept in counter-flow contact with the water vapor. Water is supplied from a water supplying portion (5) located between the first inlet (2) and a tower top (4), whereby a water layer is formed above the first inlet (2). A water/methanol vapor mixture is extracted from the tower top (4) and condensed in a condenser (6) to be thereby recovered in the form of a methanol aqueous solution. Droplets of the EVOH solution contained in the water/methanol vapor mixture are trapped in the water layer formed above the first inlet (2) and, therefore, are less liable to be introduced into the condenser (6).

Abstract: An ethylene-vinyl alcohol copolymer composition excellent in neck-in reduction, stretching properties and further, gas barrier properties and a multilayer structure using the same, are disclosed. The ethylene-vinyl alcohol copolymer composition of the present invention is the blend of two or more ethylene-vinyl alcohol copolymers and at least one of the copolymers has the following structural unit (1). (wherein X represents any binding chain excluding an ether bond, each of R1 to R4 represents independently any substituent and n represents 0 or 1). Preferably, the ethylene-vinyl alcohol copolymer having the structural unit (1) is obtained by hydrolyzing of a copolymer of 3,4-diacyloxy-1-butene, a vinyl ester monomer and ethylene.

Abstract: A dental material primer and a dentin-regenerating pulp-capping agent which exhibit an excellent dentin-regenerating action, are disclosed. The dental material primer includes a hydrolyzed ethylene-vinyl acetate copolymer in which collagen is immobilized and the dentin-regenerating pulp-capping agent includes a hydrolyzed ethylene-vinyl acetate copolymer, in which collagen is immobilized, and a binder.

Abstract: The present invention provides a polyvinyl alcohol film having a correlation length of 200 nm or less, the correlation length being derived from the result of light scattering measurement using a He—Ne laser having a wavelength of 633 nm as a light source.

Abstract: The invention is to provide: an aqueous emulsion which is excellent in emulsion polymerization stability when produced, and is excellent in mechanical stability, freezing stability, stability to long-term standing at high temperatures, water resistance adhesive property, and redispersibility; and a redispersible resin and adhesive where the aqueous emulsion is used. The invention relates to an aqueous emulsion comprising a polyvinyl alcohol-based resin (A) comprising a 1,2-diol component in a side chain and having an average degree of polymerization of 50 to 2,500 and a polymer (B) comprising at least one unsaturated monomer selected from an ethylenically unsaturated monomer and a diene-based monomer.

Abstract: The present invention provides a polyvinyl alcohol-based film for optical uses, which is excellent in stretching property and is used for producing a polarizing film excellent in polarization performance throughout the visible light wavelength range, particularly in the vicinity of the wavelength of 460 nm. The invention relates to a polyvinyl alcohol-based film for optical uses comprising a polyvinyl alcohol-based resin, wherein the polyvinyl alcohol-based resin is composed of only a polyvinyl alcohol-based resin (A) containing a 1,2-glycol bond at a side chain and the amount of the 1,2-glycol bond at a side chain is from 0.01 to 6% by mol, or a polyvinyl alcohol-based film for optical uses comprising a polyvinyl alcohol-based resin, wherein the polyvinyl alcohol-based resin includes a polyvinyl alcohol-based resin (A) containing a 1,2-glycol bond at a side chain and a polyvinyl alcohol-based resin (B) other than the polyvinyl alcohol-based resin (A) and satisfies the following expression (1): 0.

Abstract: An object of the present invention is to provide a multi-layer film excellent in adhesiveness, appearance, transparency, and anti-pinhole property even at high-speed process as well as a multi-layer stretched film excellent in gas barrier property and anti-pinhole property. The invention relates to a multi-layer film which comprises a laminate of: a thermoplastic resin-containing layer; and a layer comprising an ethylene-vinyl alcohol copolymer comprising the following structural unit (1), wherein the thermoplastic resin-containing layer is provided on one side or both sides of the layer comprising an ethylene-vinyl alcohol copolymer, wherein X represents a bonding chain which is an arbitrary bonding chain excluding an ether bond, R1 to R4 each independently represents an arbitrary substituent, and n represents 0 or 1.

Abstract: The present invention provides an aqueous composition for recording medium in a form of aqueous dispersion solution comprising a polyvinyl alcohol-based resin (A) having an average saponification degree of 80-89 mol % and an average polymerization degree of 1700-3500, and containing a polyvinyl alcohol having 1,2-diol structural unit on a side chain thereof, represented by a general formula (1); an inorganic microparticle (B); and a boron compound (C). The aqueous composition of the present invention is not likely to become gel and therefore exhibit excellent preservation stability. Furthermore, the aqueous composition provides a recording layer serving as an ink receiving layer/glossy layer satisfied with gloss, ink absorbency, and water resistance. Accordingly, the present invention may also provide an ink-jet recording medium satisfying surface gloss by forming a coating layer of the inventive aqueous composition on a substrate, even when the substrate has water resistance.

Abstract: The present invention relates to a water-soluble film, which is a polyvinyl alcohol film comprising a polyvinyl alcohol resin (A), wherein the water-soluble film has a time for dissolution in water at 20° C. of not more than 60 seconds in terms of a film thickness of 76 ?m, a b-value of the film is not more than 0.5, and a b-value of the film after leaving at 80° C. for 72 hr is not more than 1.0, preferably a water-soluble film comprising: a polyvinyl alcohol resin (A); at least two kinds of plasticizers (B); and a sulfite salt (C), wherein the content of the plasticizer (B) based on 100 parts by weight of the polyvinyl alcohol resin (A) is 5 to 50 parts by weight and the content ratio of the sulfite salt (C) to the plasticizer (B) (C/B: weight ratio) is more than 0.02 and not more than 0.35.

Abstract: A PVA resin composition is provided which is excellent in melt-formability and free from emanation of odor in a melt-forming process, and is capable of providing a product free from residual odor, a highly transparent film and a laminate film having higher interlayer adhesive strength. The resin composition comprises: (A) a polyvinyl alcohol resin having a 1,2-diol structural unit represented by the following general formula (1): and having a saponification degree of 80 to 97.9 mol %; and (B) an alkylene oxide adduct of a polyvalent alcohol containing 5 to 9 moles of an alkylene oxide per 1 mole of the polyvalent alcohol.

Abstract: The invention provides a fiber which is excellent in electrolyte absorption and retentivity and oxidation resistance and is suitable for use as a separator for alkaline secondary batteries. The invention is an ethylene/vinyl alcohol-derived copolymer fiber comprising an ethylene/vinyl alcohol-derived copolymer (A) having the following structural unit (1): (wherein R1 represents a hydrogen atom or an organic group; X represents a bonding chain other than ether bond; n represents 0 or 1; and R2 to R4 each represent a hydrogen atom or an organic group).

Abstract: An object of the present invention is to provide a new acetoacetic ester group-containing polyvinyl alcohol-based resin that contains less amount of water-insoluble matter and is excellent in transparency and viscosity stability when converted into an aqueous solution, and that realizes excellent water resistance by combined use of a crosslinking agent. The invention provides an acetoacetic ester group-containing polyvinyl alcohol-based resin containing a structural unit represented by the general formula (1): wherein at least one of R1 and R2 represents an acetoacetyl group, R3, R4, R5, R6, R7 and R8 each independently represents an arbitrary substituent, and X represents a single bond or an arbitrary bonding chain.

Abstract: The present invention aims at providing a dispersion stabilizer for suspension polymerization of a vinyl-based compound, which gives vinyl chloride-based polymer particles having a sharp particle size distribution and a high bulk density owing to excellent dispersion stability during polymerization, and which can produce vinyl chloride-based polymer particles with few wet foams, hardly accompanied with formation of polymer scales and foamy polymers attributable to dry foams, with less coloring, and having excellent heat resistance. The dispersion stabilizer of the invention comprises a PVA-based resin having a 1,2-diol component at a side chain and a degree of saponification of 65 to 87% by mol.

Abstract: The embodiments provide a temporary vascular embolic agent temporarily blocking the blood vessel in vivo, having appropriate dissolution speed suitable for use in the blood vessel in which blood flow is fast and being more superior in the passing property of a catheter and the controllability of embolization time than conventional one. The embolization of the blood vessel led to cardiac muscle in which blood flow speed is fast is enabled by the temporary vascular embolic agent of the present invention using the pearl like polyvinyl alcohol (PVA) particles having 0.1 to 2% by mol of a 1,2-diol configuration unit and having a saponification degree of at least 99% by mol.

Abstract: The present invention relates to a recording medium, particularly a recording medium for ink jet printing, in which the surface strength of the coating surface is strong, ink blurring when printing hardly occurs and water resistance after printing is excellent and a process for preparing the same. That is, the present invention is a recording medium having a coating layer comprising (A) a polyvinyl alcohol resin containing an acetoacetic ester group, (B) a zirconium compound and (C) an inorganic powder on the surface of a substrate. Also, the present invention is a process for preparing a recording medium which comprises a step of preparing a coating solution comprising a polyvinyl alcohol resin containing an acetoacetic ester group (A), a zirconium compound (B) and an inorganic powder (C) and a step of applying the coating solution to the surface of a substrate.

Abstract: It is disclosed that a resin composition comprising EVOH resin (A), polyamide resin (B) and inorganic salt (C) capable of forming a hydrate wherein the content amount of the inorganic salt (C) is in the range of 2 to 50 parts by mass based on 100 parts by mass of the EVOH resin (A), and the mass ratio ((B)/(C)) of the polyamide resin (B) to the inorganic salt (C) is in the range of 95/5 to 5/95. The resin composition exhibits excellent gas barrier property and less elution of EVOH resin even after hot water treatment, and excellent long-run processability.