公开(公告)号：US20210324163A1

公开(公告)日：2021-10-21

申请号：US17360076

申请日：2021-06-28

Applicant: KURARAY CO., LTD.

Inventor： Minoru Okamoto ,  Sayaka Shimizu ,  Osamu Kazeto

IPC: C08J5/18 ,  B65D65/46

Abstract: Provided are a water-soluble film capable of maintaining good mechanical strength even when packaging a liquid detergent and the like while maintaining excellent water solubility of the water-soluble 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 for a first surface is Fd1 and a crystallinity index calculated for a second surface opposed to the first surface is Fd2 for FT-IR measurement of respective two surfaces of the water-soluble film by ATR technique using a diamond prism, the Fd1 and the Fd2 are 0.22≤Fd1≤0.72, 0.2≤Fd2≤0.65 and Fd1/Fd2≥1.1.

公开(公告)号：US20210324158A1

公开(公告)日：2021-10-21

申请号：US17359991

申请日：2021-06-28

Applicant: KURARAY CO., LTD.

Inventor： Minoru Okamoto ,  Sayaka Shimizu ,  Osamu Kazeto

IPC: C08J5/18 ,  C11D17/04 ,  C11D3/37 ,  A01N25/10 ,  A01N25/34 ,  B65D65/46

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.

公开(公告)号：US20210324156A1

公开(公告)日：2021-10-21

申请号：US17359952

申请日：2021-06-28

Applicant: KURARAY CO., LTD.

Inventor： Minoru Okamoto ,  Sayaka Shimizu ,  Osamu Kazeto

IPC: C08J5/18 ,  B65D65/46 ,  B29C41/00 ,  B29C41/24 ,  B29C41/46

Abstract: Provided are a water-soluble film having excellent solubility in water and capable of reducing the stickiness of the contact surfaces to each other at the edges during storage in rolls, 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 satisfies a formula (1) below when amounts of crystalline component are respectively (A1)0, (A1)60, and (A1)180, the amounts being obtained from a spin-spin relaxation curve by 1H pulse NMR measurement of the water-soluble film immediately after, 60 seconds after, and 180 seconds after the water-soluble film is immersed in a mixed solution of deuterated water and deuterated methanol mixed at a volume ratio of 1:1 at 5° C. ( Math ⁢ ⁢ 1 ) 0.2