Kuraray Co., Ltd.

Yoko Mori

Masaki Kato

Masahiro Takafuji

Tatsuya Tanida

Masako Kawagoe

Hideki Maki

Keishi Hachiya

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 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

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 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

Growing community of inventors

Osaka, Japan

Yoko Mori