Kuraray Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Goki Uehara

Tatsuya Oshita

Manabu Shibata

Osamu Kazeto

Atsuhiro Nakahara

Takehiro Miyamoto

Hideharu Iwasaki

Yukiatsu Komiya

Shigeki Takada

Nozomu Sugo

Syuichi Kanao

Naoki Kawakami

Kanenori Ito

Yoshiki Takeda

Nobuhisa Senda

Provided is a paper container having a window and being formed of a laminate that includes at least a paper layer and a gas barrier laminate, the paper layer having a cutout part for the window, the cutout part being covered with the gas barrier laminate, and the gas barrier laminate including a substrate and a gas barrier layer laminated on at least one surface of the substrate, wherein the gas barrier layer is formed of a composition containing a polymer having at least one functional group selected from a carboxyl group and a carboxylic anhydride group, and wherein &#x2014;COO&#x2014; groups contained in the at least one functional group are neutralized at least partly with a metal ion having a valence of two or more.

Paper container

Provided is a gas barrier layered product including a base material and a layer stacked on at least one surface of the base material, wherein the layer is formed of a composition including: a hydrolyzed and condensed product of at least one compound (L) containing a metal atom to which at least one characteristic group selected from a halogen atom and an alkoxy group has been bonded, wherein the compound (L) contains at least one compound (A) and at least one compound (B), wherein a mole ratio of the compound (A) / the compound (B) is in a range of 0.5/99.5 to 40/60; and a neutralized product of a polymer containing at least one functional group selected from a carboxyl group and a carboxylic anhydride group, wherein at least 55 mol % of a &#x2014;COO&#x2014; group contained in the at least one functional group has been neutralized with a metal ion having a valence of two or more. Also provided is a method for producing the gas barrier layered product.

Gas barrier layered product and packaging medium, and method for producing gas barrier layered product

A gas barrier layered product including a base material and a layer stacked on a surface of the base material, wherein the layer is formed of a composition including: a hydrolyzed and condensed product of a compound (L) containing a metal atom to which a group selected from a halogen atom and an alkoxy group is bonded, and a compound (A) in which an organic group selected from a halogen atom, a mercapto group and a hydroxyl group is further bonded to the metal atom; a neutralized product of a polymer containing a functional group selected from a carboxyl group and a carboxylic anhydride group, wherein at least 40 mol % of a &#x2014;COO&#x2014; group contained in the functional group has been neutralized with a metal ion having a valence of two or more; and a compound (D) bonded to both the &#x2014;COO&#x2014; group and a group on the surface of the hydrolyzed and condensed product of the compound (L). A method for producing the gas barrier layered product.

Gas barrier layered product, method of manufacturing the same and packaging medium using the same

Provided is a gas barrier layered product including a base material and a layer stacked on at least one surface of the base material, wherein the layer is formed of a composition including: a hydrolyzed and condensed product of at least one compound (L) containing a metal atom to which at least one characteristic group selected from a halogen atom and an alkoxy group has been bonded, wherein the compound (L) contains at least one compound (A) and at least one compound (B), wherein a mole ratio of the compound (A)/the compound (B) is in a range of 0.5/99.5 to 40/60; and a neutralized product of a polymer containing at least one functional group selected from a carboxyl group and a carboxylic anhydride group, wherein at least 55 mol % of a &#x2014;COO&#x2014; group contained in the at least one functional group has been neutralized with a metal ion having a valence of two or more. Also provided is a method for producing the gas barrier layered product.

A vinyl alcohol polymer composition (II) is produced by a process of providing a reaction liquid comprising a solution containing a vinyl carboxylate polymer and, a first metal alkoxide (I) having at least one functional group and/or an oligomer (I) having at least one functional group obtained from said metal alkoxide (I); a step of simultaneously effecting (a) saponification of said vinyl carboxylate polymer and (b) reaction in which at least part of the functional groups of said metal alkoxide (I) and/or said oligomer (I) participates, thereby obtaining a vinyl alcohol polymer composition (I); and a step of preparing a solution (A) containing said vinyl alcohol polymer composition (I), followed by adding to the solution (A) a second metal alkoxide (II) and/or an oligomer (II) obtained from the metal alkoxide (II) or another solution (B) containing the metal alkoxide (II) and/or the oligomer (II) derived from the metal alkoxide (II), to prepare an intermediate product solution (C), and then removing the solvent from said solution (C). The vinyl alcohol polymer composition obtained by the above process has excellent gas-barrier properties, in particular excellent gas-barrier properties under high-humidity conditions. The vinyl alcohol polymer composition is suitably usable as a coating agent having good storage stability and little uneven applicability, and as gas-barrier material, in particular laminate having excellent gas-barrier properties under high-humidity conditions.

Process for producing vinyl alcohol polymer compositions

Growing community of inventors

Kurashiki, Japan

Goki Uehara