Kuraray Co., Ltd.

Kuraray Europe Gmbh

Kurarayco., Ltd.

Masaki Kato

Yoko Mori

Masato Nakamae

Ghebrehiwet Ghebremeskel

Keisuke Morikawa

Masahiro Takafuji

Akira Tsuboi

Robert Walter Fuss

Tatsuya Tanida

Naokiyo Inomata

Yuta Taoka

Kazuyuki Somemiya

Yoriko Imaoka

Samuel Michel

Keishi Hachiya

Michael Collins

Naoki Fujiwara

Takeshi Kusudou

Shinsuke Nii

Yusuke Amano

Seiji Tanimoto

Masako Kawagoe

Yoko Nakano

Masako Katayama

Hideki Maki

Richard Cazares

Levi Neufeld

Erik Bateham

Yasutomo Saitou

Syunji Tago

Brittany Spell

Yoshiko Sho, Legal Representative

Yukiko Sho, Legal Representative

Robert W Fuss

Robert Fuss

Fuss Robert

Michel Samuel

Disclosed are particulate polyvinyl alcohol-based compositions for use in manufacturing chemical materials and in other industrial operations, and for treatments applied to a subterranean formation traversed by the borehole of an oil or gas well, which compositions are prepared by granulating polyvinyl alcohol polymers, and admixing the granules so produced with powder and/or crushing the granules to a specified particle size distribution.

Polyvinyl alcohol compositions having improved particle size distribution

Provided are particulate polyvinyl alcohol-based diverting agents for use in subterranean treatments, which are prepared by compacting a specified polyvinyl alcohol copolymer optionally with certain specified additives and optionally other polyvinyl alcohols.

Polyvinyl alcohol based diverting agents

Provided are low dust-content particulate polyvinyl alcohol-based compositions suitable for a variety of end uses including for use in subterranean treatments and for manufacturing chemical materials, which are prepared by compacting a specified polyvinyl alcohol polymer resins, optionally with specified additives and/or other polyvinyl alcohols.

Particulate polyvinyl alcohol compositions having reduced dust content

The present invention relates generally to a highly-hydrolyzed polyvinyl alcohol composition having increased cold-water solubility, a process for making such a polyvinyl alcohol composition, and various end uses thereof.

Particulate polyvinyl alcohol copolymers, process for making and uses of the same

Modified polyvinyl alcohol contains a (meth)acrylamide monomer unit having an ionic group, wherein the modified polyvinyl alcohol has a degree of saponification of from 50 to 99.99 mol % and a viscosity-average degree of polymerization of from 200 to 5000 and satisfies formulae (1) to (3) below. The modified polyvinyl alcohol thus obtained is particularly excellent in dispersibility in water.0.8&#x2264;()&#x2264;1.3&#x2003;&#x2003;(1)1&#x2264;()&#x2264;7&#x2003;&#x2003;(2)0.03&#x2264;&#x2264;0.5&#x2003;&#x2003;(3).

Modified polyvinyl alcohol and water-soluble film containing same

The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof.

Particulate polyvinyl alcohol, process for making and uses of the same

The present invention provides: a water-soluble film that is superior in cold water solubility and in practical properties such as strength and stiffness and that can resist deterioration in various properties such as chemical resistance over time; and a modified polyvinyl alcohol used for the water-soluble film. The present invention relates to a modified polyvinyl alcohol containing 0.05 to 10 mol % of a monomer unit having two carboxyl groups. InH-NMR spectroscopy of the modified polyvinyl alcohol, an integral (X) from 6.8 to 7.2 ppm and an integral (Y) from 5.3 to 5.5 ppm satisfy the following expression:0.60&#x2264;/()&#x3c;1.0.

Modified polyvinyl alcohol and water-soluble film

A modified PVA that enables formation of a film superior in cold water solubility, mechanical strength, and chemical resistance is provided. The modified PVA comprises a monomer unit represented by formula (I), and a structural unit represented by formula (II): wherein: a content of the monomer unit (I) is from 0.05 mol % to 10 mol %, and a content of the structural unit (II) is from 0.001 mol % to 0.5 mol % with respect to the total monomer units in the modified PVA; a viscosity average degree of polymerization is from 300 to 3,000; and a degree of saponification is from 82 mol % to 99.5 mol %. In the formula (I): Rrepresents a hydrogen atom, or a methyl group; and Rrepresents &#x2014;R&#x2014;SOX, &#x2014;R&#x2014;N(R)Cl, or a hydrogen atom, Rrepresenting an alkanediyl group, Xrepresenting a hydrogen atom, a metal atom, or an ammonium group, and Rrepresenting an alkyl group.

Modified polyvinyl alcohol, resin composition, and film

Modified polyvinyl alhohol, resin composition, and film

A resin composition that enables formation of a film superior in cold water solubility, mechanical strength, and chemical resistance is provided. The resin composition comprises a modified PVA comprising a monomer unit represented by formula (I), and an amine compound represented by formula (II): a content of the amine compound with respect to 100 parts by mass of the modified PVA being from 0.01 parts by mass to 1 part by mass. In the formula (I), Rrepresents a hydrogen atom, or an alkyl group having 1 to 8 carbon atoms; and Rrepresents &#x2014;R&#x2014;SOX, &#x2014;R&#x2014;N(R)Cl, or a hydrogen atom, Rrepresenting an alkanediyl group having 1 to 10 carbon atoms, Xrepresenting a hydrogen atom, a metal atom, or an ammonium group, and Rrepresenting a linear or branched alkyl group having 1 to 5 carbon atoms. In the formula (II), Rrepresents &#x2014;R'&#x2014;SOX&#x2032;, &#x2014;R&#x2032;&#x2014;N(R&#x2032;)Cl, or a hydrogen atom.

Resin composition and film

The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content, a process for making such a polyvinyl alcohol composition, and various end uses thereof.

Modified polyvinyl alcohol contains a monomer unit having a carboxyl group, wherein the modified polyvinyl alcohol has a degree of saponification of from 50 to 99.99 mol % and a viscosity-average degree of polymerization of from 200 to 5000 and satisfies formulae (1) to (3) below. The modified polyvinyl alcohol of the present invention thus obtained is particularly excellent in dispersibility in water.0.8&#x2266;(Mw/Mw)&#x2266;1.2&#x2003;&#x2003;(1)2&#x2266;(Mw/Mn)&#x2266;8&#x2003;&#x2003;(2)0.01&#x2266;A&#x2266;0.8&#x2003;&#x2003;(3)

Provided is a modified polyvinyl alcohol containing 0.1 to 10 mol % of a monomer unit represented by formula (1) below and having a degree of polymerization exceeding 2000. This provides a modified polyvinyl alcohol an aqueous solution of which foams less and which has excellent film strength and gas barrier properties under high humidity conditions, while having excellent water solubility. [In formula (), Rrepresents a hydrogen atom or a methyl group.]

Modified polyvinyl alcohol and production method therefor

Provided by the present invention is a PVA having highly harmonized adequate water solubility, thickening property and coating film strength, and having superior storage stability in terms of the viscosity in an aqueous solution. A vinyl alcohol polymer having a ratio (Mw (A)/Mn (A)) of the weight average molecular weight (Mw (A)) to the number average molecular weight (Mn (A)) of 3 or greater and 8 or less, and being capable of giving a vinyl alcohol polymer having a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) of 2 or greater and less than 3 when treated at 40&#xb0; C. for 1 hour in a sodium hydroxide solution.

Vinyl alcohol polymer, thickening agent, stabilizer for emulsion polymerization, stabilizer for suspension polymerization, coating agent, coated article, sizing agent for fibers, sized yarn, and production method of textile

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.

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Kurashiki, Japan

Masaki Kato