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公开(公告)号：US20210324157A1
公开(公告)日：2021-10-21
申请号：US17359960
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: Provided are a water-soluble film that causes less deformation of the package during storage, while maintaining excellent solubility in water, and is capable of suppressing the occurrence of tears and the like, a production method thereof, and a package using the water-soluble film. A water-soluble film of the present invention includes a polyvinyl alcohol resin. The water-soluble film has an amount (A1) of crystalline component of 60% or less and an amount (A2) of constrained amorphous component from 10% to 50%, the amounts being obtained from a spin-spin relaxation curve by 1H pulse NMR measurement of the water-soluble film in deuterated methanol. A ratio (A1/A2) of the amount (A1) of crystalline component to the amount (A2) of constrained amorphous component is preferably from 0.1 to 5.
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公开(公告)号：US20230257534A1
公开(公告)日：2023-08-17
申请号：US18003771
申请日：2021-06-14
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
CPC classification number: C08J5/18 , C08K5/053 , C08J2329/04
Abstract: [Problem to be solved] To provide a water-soluble film capable of which is excellent in water solubility and less likely to cause problems such as breakage of packaging material during storage and transportation by controlling the crystal long period structure of the PVA molecule and, for example, the degree of phase separation state between PVA and other components in the water-soluble film.
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公开(公告)号：US20210324160A1
公开(公告)日：2021-10-21
申请号：US17360018
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: Provided are a water-soluble PVA film having good water sealing properties in addition to excellent water solubility while maintaining mechanical strength of the water-soluble PVA film and a package using the same. A water-soluble film of the present invention includes a polyvinyl alcohol resin. When a crystallinity index calculated using a diamond prism is Fd1 and a crystallinity index calculated using a germanium prism is Fg1 for FT-IR measurement of a first surface of the water-soluble film by ATR technique, Fd1 and Fg1 are 0.25 Fd1 0.65 and Fd1/Fg1 >1. Fd1 and Fg1 are preferably Fd1/Fg1≤1.5.
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公开(公告)号：US12291613B2
公开(公告)日：2025-05-06
申请号：US17360055
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto , Mitsunori Asada
Abstract: A water-soluble film is provided that is excellent in film transparency and water solubility and inhibits sticking between the films. A water-soluble film includes a polyvinyl alcohol resin, wherein a crystallite size obtained from an X-ray profile obtained by wide-angle X-ray measurement is from 4.0 to 5.5 nm and a degree of crystallization obtained from the X-ray profile is from 10.0% to 25.0%, and an external haze is from 7.0% to 30.0%.
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公开(公告)号：US12275827B2
公开(公告)日：2025-04-15
申请号：US17360004
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: Provided are a water-soluble film capable of inhibiting sticking between the films while maintaining excellent water solubility and a package using the same. A water-soluble film of the present invention includes a polyvinyl alcohol resin. When a crystallinity index calculated using a diamond prism is Fd1 and a crystallinity index calculated using a germanium prism is Fg1 for FT-IR measurement of a first surface of the water-soluble film by ATR technique, Fd1 and Fg1 are Fd1≤0.65 and Fd1/Fg1
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Patent Agency Ranking
公开(公告)号：US20230250245A1
公开(公告)日：2023-08-10
申请号：US18003793
申请日：2021-06-14
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
CPC classification number: C08J5/18 , C08J3/28 , C08J2329/04
Abstract: [Problem to be solved] To provide a water-soluble film that is excellent in high-speed printability and moisture resistance.
[Solution] A water-soluble film containing a polyvinyl alcohol resin, wherein the water-soluble film has a surface on at least one side in which an abundance ratio of carbon-oxygen single bond (C—O) in all carbon element bonds obtained by X-ray photoelectron spectroscopy is in the range of 75 to 85%.-
公开(公告)号：US20220135301A1
公开(公告)日：2022-05-05
申请号：US17574792
申请日：2022-01-13
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: There is provided a water-soluble film containing polyvinyl alcohol resin, wherein a ratio RSm (LD/TD) is 1.2 or greater and 2.5 or less, where the RSm (LD/TD) is the ratio of an average length RSm (LD) of roughness curve elements on at least one film surface in the longitudinal direction to an average length RSm (TD) of roughness curve elements on the same film surface in the transverse direction. This allows provision of a water-soluble film that can be suitably used for manufacturing a package with excellent uniformity of seal strength, even for manufacturing a package with excellent uniformity of seal strength during high-speed sealing; and a package using the film.
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公开(公告)号：US20210324164A1
公开(公告)日：2021-10-21
申请号：US17360098
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: The present invention provides a monolayer base film for hydraulic transfer printing that is excellent in water solubility and allows high resolution transfer printing without rupture even in high speed printing and a film for hydraulic transfer printing using the same. The present invention is a base film for hydraulic transfer printing comprising a polyvinyl alcohol resin, the base film forming a printing layer to be transferred to an article by hydraulic transfer printing. In this base film for hydraulic transfer printing, the base film for hydraulic transfer printing has an amount (A1) of crystalline component of 60% or less and an amount (A2) of constrained amorphous component from 10% to 50%, the amounts being obtained from a spin-spin relaxation curve by 1H pulse NMR measurement of the base film in deuterated methanol, and a moisture content from 1 to 5 mass %.
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公开(公告)号：US20210324161A1
公开(公告)日：2021-10-21
申请号：US17360040
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto , Mitsunori Asada
IPC: C08J5/18
Abstract: A water-soluble film is provided that is capable of achieving deformation resistance during pouch storage as well as excellent water solubility of the film and excellent reduction in undissolved residues. A water-soluble film includes a polyvinyl alcohol-based resin, wherein a crystal long period Ds obtained from an X-ray profile obtained by small-angle X-ray scattering measurement in a water/methanol mixed solvent (volume ratio: 2/8) is from 10.0 to 30.0 nm and a rate of increase (DS−Da)/Da of the crystal long period Ds to a crystal long period Da obtained by small-angle X-ray scattering measurement before immersion in the solvent is 30% or more and 130% or less.
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公开(公告)号：US12234333B2
公开(公告)日：2025-02-25
申请号：US17359991
申请日：2021-06-28
Applicant: KURARAY CO., LTD.
Inventor： Minoru Okamoto , Sayaka Shimizu , Osamu Kazeto
Abstract: Provided are a water-soluble film preferably used for production of a package that has excellent surface gloss and has excellent anti-blocking properties, and a package using the same. A water-soluble film includes a polyvinyl alcohol resin, wherein the water-soluble film has a glossy surface with an average height SRc(G) of 1.8 μm or less and a maximum height SRz(G) of 20 μm or more and 50 μm or less.
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