| Patent application number | Description | Published |
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| 20090023880 | POLYVINYL ALCOHOL HAVING 1,2-GLYCOL BOND IN SIDE CHAIN AND PROCESS FOR PREPARING THE SAME - There is disclosed a polyvinyl alcohol having a 1,2-glycol bond in a side chain, which has the features that there is no generation of dimethyl carbonate in the preparation thereof, no need of an eliminating process of dimethyl carbonate in the recovering process of waste liquid after hydrolysis. Also, even an introduction amount of 1,2-glycol bonds is increased, there is no deterioration of solubility in a hydrolyzing solution (methanol) of a copolymer (paste) before hydrolysis, further, water-insoluble is not lowered even in experiencing thermal history. Specifically, there is provided a polyvinyl alcohol having a 1,2-glycol bond in a side chain obtained by hydrolyzing a copolymer of a vinyl ester monomer and a compound shown in the formula (1). | 01-22-2009 |
| 20090061719 | WATER-SOLUBLE POLYVINYL ALCOHOL RESIN FILAMENT AND NONWOVEN FABRIC MADE BY USING THE SAME - A water-soluble polyvinyl alcohol resin filament is provided, which is formed by melt-spinning a material consisting essentially of a water-soluble polyvinyl alcohol resin having a 1,2-diol structural unit represented by the following general formula (1). A nonwoven fabric is also provided, which is produced by using the water-soluble polyvinyl alcohol resin filament. Therefore, the nonwoven fabric is excellent in water solubility at a lower temperature, and substantially free from bubbling during dissolution thereof in water. In addition, a fully saponified PVA can be used for melt-forming. This suppresses emanation of acetic acid odor, thereby improving the working environment. | 03-05-2009 |
| 20090093609 | Polyvinyl Acetal-Based Resin - The present invention provides a polyvinyl acetal-based resin which has a high elastic modulus, is excellent in solubility to an alcoholic solvent, and gives a highly transparent alcohol solution. The polyvinyl acetal-based resin is obtained by acetalizing a polyvinyl alcohol-based resin (A) which has 0.1 to 1.5% by mol of a 1,2-diol structural unit represented by the following general formula (1) and a degree of saponification of 98.5% by mol or more: | 04-09-2009 |
| 20090149599 | Polyvinyl Alcohol-Based Resin and Use Thereof - An object of the present invention is to provide a novel polyvinyl alcohol-based resin excellent in viscosity stability of an aqueous solution, high-speed coatability, reactivity with a crosslinking agent and water solubility. The invention relates to a polyvinyl alcohol-based resin comprising a structural unit having a carboxyl group-containing long-chain alkyl group on a side chain, which is represented by the general formula (1): | 06-11-2009 |
| 20090253865 | Acetoacetic Ester Group-Containing Polyvinyl Alcohol-Based Resin, Resin Composition, and Uses Thereof - 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): | 10-08-2009 |
| 20090253880 | DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION OF VINYL-BASED COMPOUND - 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. | 10-08-2009 |
| 20090286909 | POLYVINYL ALCOHOL RESIN COMPOSITION AND FILMS - 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): | 11-19-2009 |
| 20090316264 | POLYVINYL ALCOHOL-BASED FILM FOR OPTICAL USE, POLARIZING FILM, AND POLARIZING PLATE - 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): | 12-24-2009 |
| 20100029846 | Aqueous Emulsion and Uses Thereof - 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. | 02-04-2010 |
| 20100215613 | PVA Particle for Temporary Embolic Material and Production Process Thereof, and Temporary Embolic Material - A temporary embolic material for blood vessel which can embolize a blood vessel in a living body and is used for the temporary embolization of the blood stream. More specifically, disclosed is an embolus-forming material comprising a specific PVA particle which can be used for the closure of the inner lumen of a blood vessel by the PVA particle to embolize the blood stream, which can ultimately be absorbed in the living body, which can be excreted out of the body and which does not remain in the body. A pearl-like polyvinyl alcohol particle for use as a temporary embolic material, the particle having a saponification degree of 90 mol % or higher and an average particle diameter of 70 to 1000 μm; and a temporary embolic material comprising the particle mixed or dissolved therein. | 08-26-2010 |
| 20100261830 | AQUEOUS EMULSION AND PRODUCTION METHOD THEREOF - This invention provides an aqueous emulsion, which comprises a polyvinyl alcohol-based resin, as the dispersant, and a polymer comprising a structural unit derived from an ethylenically unsaturated monomer, as the dispersoid, from which a film having excellent transparency can be obtained, and which is excellent in mechanical stability, chemical stability, freezing stability and storage stability, and a method for producing the same, and relates to an aqueous emulsion which has an average particle size of the dispersoid of from 100 to 450 μm and an apparent grafting efficiency of the polyvinyl alcohol-based resin of from 65 to 75% based on the dispersoid, and a method for producing the same. | 10-14-2010 |
