Patent application number | Description | Published |
20090111940 | DISPERSION STABILIZER - The aforementioned problems can be solved by a dispersion stabilizer composed of a polyvinyl alcohol polymer (B) having a double bond in its side chain. The polyvinyl alcohol polymer (B) is obtained by esterifying a polyvinyl alcohol polymer (A) with a carboxylic acid having an unsaturated double bond or a salt thereof. Furthermore, the aforementioned problems can be solved with a dispersion stabilizer composed of a carboxylic acid-modified polyvinyl alcohol polymer (C) that is obtained by esterifying a polyvinyl alcohol polymer (A) with aliphatic carboxylic acid and/or aromatic carboxylic acid containing no olefinically unsaturated bond in the molecule or a salt thereof. | 04-30-2009 |
20100041828 | DISPERSION STABILIZER FOR SUSPENSION POLYMERIZATION - The present invention provides a dispersion stabilizer having an excellent polymerization stability. When used for suspension polymerization of vinyl compounds even in small amounts, the dispersion stabilizer according to the present invention attains the effects that: with respect to vinyl polymer particles to be obtained, the plasticizer absorptivity is high, leading to easy processing; residual monomer components such as a vinyl compound can be removed easily; the number of coarse particles is small; the obtained particles are as uniform as possible in particle size so that formation of fish-eyes can be prevented. The present invention provides a dispersion stabilizer for suspension polymerization including a polyvinyl alcohol polymer (A) having a saponification degree of 60 mol % or more and a polymerization degree of 200 or more, and a polyvinyl alcohol polymer (C) obtained by esterifying a polyvinyl alcohol polymer (B) having a saponification degree of less than 60 mol % with a carboxylic acid compound. | 02-18-2010 |
20100184917 | METHOD FOR PRODUCING VINLY RESIN - The present invention provides a method for producing a vinyl resin in which, in suspension polymerization of a vinyl compound using a polymerization tank equipped with a reflux condenser, uniform vinyl polymer particles are obtained and an excellent defoaming property is achieved against dry foam that occurs at middle to later stages of the polymerization. The present invention provides a method for producing a vinyl resin including the step of in suspension polymerization of a vinyl compound using a polymerization tank equipped with a reflux condenser in the presence of a dispersion stabilizer for suspension polymerization, adding, at the time when the polymerization conversion is 10% or more, 0.001 to 5 parts by weight of a vinyl alcohol polymer (A) that has, in its side chain, an unsaturated double bond, an aromatic group optionally having a carboxyl group, a saturated aliphatic group having a carboxyl group, or a saturated aliphatic group having at least 11 carbon atoms, with respect to 100 parts by weight of the vinyl compound. | 07-22-2010 |
20100190890 | POLYVINYL ALCOHOL AS CO-STABILIZER FOR PVC - Thermoplastically processable PVC mixtures having enhanced stability are prepared by incorporating at least one stabilizer containing metal ions and a modified polyvinyl alcohol co-stabilizer. | 07-29-2010 |
20100196731 | VINYL ALCOHOL POLYMER-CONTAINING COATING AGENT FOR PAPER AND PAPER AND THERMAL PAPER COATED WITH THE COATING AGENT - A vinyl alcohol polymer-containing coating agent for paper is provided that allows a curing step to be omitted after a paper surface is coated therewith and makes it possible to form a layer (for example, a coating layer or a color developing layer) that is excellent in water resistance and is subjected to less yellowing over time. It is an aqueous composition containing a vinyl alcohol polymer (A) in which the content X of vinyl alcohol units (mol %) and the content Y of ethylene units (mol %) satisfy a formula X+0.2Y>95, where X<99.9 and 0≦Y≦10, and an addition condensate (B) between ethylene urea and glyoxal in which the content of terminal aldehyde groups per gram of solid content is 1.2 to 3.0 (mmol), wherein the solid content weight ratio between the vinyl alcohol polymer (A) and the addition condensate (B) is in a range of (A):(B)=99:1 to 50:50. | 08-05-2010 |
20100234508 | CARBOXY-MODIFIED POLYVINYL ALCOHOL AS CO-STABILIZER FOR PVC - Use of a modified polyvinyl alcohol, obtained by copolymerization of at least on vinyl ester and at least one olefinically unsaturated carboxylic acid or the metal salt, anhydride or ester thereof and subsequent partial saponification of the copolymer as co-stabilizer in thermoplastic processable mixtures based on polyvinyl chloride, containing at least one metal ion stabilizer. | 09-16-2010 |
20100280202 | VINYL ALCOHOL-BASED POLYMER AND FILM CONTAINING THE SAME - Provided are a polyoxyalkylene modified vinyl alcohol-based polymer, including a polyoxyalkylene group in side chain, wherein the vinyl alcohol-based polymer has a viscosity average degree of polymerization P of from 200 to 5000, has a degree of saponification of from 20 to 99.99 mol %, and has an amount S of polyoxyalkylene modification of from 0.1 to 10 mol % and a film containing the same. By way of them, a polyvinyl alcohol-based polymer that is soluble in water and also high in viscosity, and a film that is less in a decrease of tensile elastic modulus when conditioned in high humidity, is excellent in water repellency on the film surface, and exhibits water solubility are provided. | 11-04-2010 |
20110086964 | POLYVINYL CHLORIDE RESIN COMPOSITION AND MANUFACTURING METHOD THEREOF - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of from 75 to 99.9 mol % and having a viscosity average degree of polymerization of 450 or less; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that is excellent in thermal stability while being shaped and with which a less colored shaped article can be obtained. | 04-14-2011 |
20110130504 | POLYVINYL CHLORIDE RESIN COMPOSITION AND MANUFACTURING METHOD THEREOF - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of not less than 30 mol % and less than 75 mol % and having a viscosity average degree of polymerization of less than 300; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that is good in thermal stability while being shaped and with which a shaped article of excellent transparency can be obtained. | 06-02-2011 |
20110178217 | POLYVINYL CHLORIDE RESIN COMPOSITION AND METHOD FOR PRODUCING THE SAME - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer containing from 0.01 to 15 mol % of a monomer unit having a specific polyoxyalkylene group in a side chain and having a degree of saponification of from 30 to 99.9 mol %; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. In addition, a polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer containing from 0.5 to 18 mol % of an ethylene unit and having a degree of saponification of a vinyl acetate unit of from 30 to 99.9 mol %; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided which is excellent in thermal stability while being shaped and with which a less colored shaped article can be obtained. | 07-21-2011 |
20110201737 | POLYVINYL CHLORIDE RESIN COMPOSITIONS AND MANUFACTURING METHOD THEREFOR - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a polyvinyl alcohol having a viscosity average degree of polymerization of from 100 to 3000 and having a ratio Mw/Mn of a weight average molecular weight | 08-18-2011 |
20110213063 | POLYVINYL CHLORIDE RESIN COMPOSITION AND METHOD FOR PRODUCING SAME - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having a degree of saponification of from 30 to 99.9 mol %, having a viscosity average degree of polymerization of 1000 or less, and having a carboxyl group, a sulfonic acid group, or a salt thereof at a terminal; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. In addition, a polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a vinyl alcohol-based polymer having an alkyl group with a carbon number of 6 or more at a terminal, having a degree of saponification of from 30 to 99.9 mol %, and having a viscosity average degree of polymerization of 1000 or less; and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided which is excellent in thermal stability while being shaped and with which a less colored shaped article can be obtained. | 09-01-2011 |
20110313105 | POLYVINYL ALCOHOL POLYMER AND METHOD FOR PRODUCING THE SAME - The present invention provides a polyvinyl alcohol polymer having excellent water solubility, compared to conventional polyvinyl alcohol polymers, and having a high cloud point even when the polyvinyl alcohol polymer is partially saponified. The present invention is a polyvinyl alcohol polymer having, at its end, a group represented by the general formula (I) and/or having, in its main chain, a group represented by the general formula (II). In the formulae, R denotes a hydrogen atom or an OM group, and M denotes a hydrogen atom, an alkali metal atom, a 1/2 alkaline earth metal atom, or an ammonium group. | 12-22-2011 |
20110319541 | POLYVINYL CHLORIDE RESIN COMPOSITION AND MANUFACTURING METHOD THEREFOR - A polyvinyl chloride resin composition contains: from 0.005 to 5 parts by weight of a polyvinyl alcohol having structural units expressed by a formula (1); and from 0.01 to 5 parts by weight of a zinc compound, based on 100 parts by weight of a polyvinyl chloride resin. A polyvinyl chloride resin composition is thereby provided that is good in thermal stability and less colored while being shaped and also allows to obtain a shaped article thereof having less rough surface and showing little loss of transparency after melt process. | 12-29-2011 |
20130158222 | POLYVINYL ALCOHOL POLYMER, AND METHOD FOR PRODUCING HYDROLYZABLE CELLULOSE USING THE SAME - A polyvinyl alcohol polymer capable of, in producing hydrolyzable cellulose using a cellulosic biomass as a basic material, readily disrupting the cellulosic biomass at a molecular level by imparting a suitable flow resistance to a solution containing the cellulosic biomass, or the like, thereby resulting in efficient production of hydrolyzable cellulose to be enabled; and a method for producing hydrolyzable cellulose using the polyvinyl alcohol polymer. Provided is a polyvinyl alcohol polymer for use in producing hydrolyzable cellulose using a cellulosic biomass as a basic material, the polyvinyl alcohol polymer having: an average degree of polymerization of no less than 200 and no greater than 5,000; a degree of saponification of no less than 70 mol % and no greater than 99.9 mol %; and a molecular weight distribution of no less than 2.2. | 06-20-2013 |
20130209817 | ALKYL-MODIFIED VINYL ALCOHOL POLYMER, AND COMPOSITION, THICKENER, COATING MATERIAL FOR PAPER, COATED PAPER, ADHESIVE AND FILM CONTAINING THE SAME - An object of the invention is to provide a novel alkyl-modified PVA capable of exerting superior thickening properties while maintaining high water solubility, and also capable of having high water resistance in a state being hardened without using an especial crosslinking agent. In addition, another object is to provide a composition, a thickener, a coating material for papers, a coated paper, an adhesive and a film containing the alkyl-modified PVA. Provided is an alkyl-modified vinyl alcohol polymer containing (a) a monomer unit represented by the following general formula (I): | 08-15-2013 |