	US 12,084,552 B2
	Poly(vinyl alcohol) film and production method for polarizing film
Yohei Nishimura, Osaka (JP); Yasunari Kusaka, Osaka (JP); and Nami Nakajima, Osaka (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/041,585
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Mar. 28, 2019, PCT No. PCT/JP2019/013876 § 371(c)(1), (2) Date Sep. 25, 2020, PCT Pub. No. WO2019/189695, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-070357 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0032421 A1, Feb. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/18 (2006.01); C08F 116/06 (2006.01); C08K 5/053 (2006.01); C08L 29/04 (2006.01); G02B 5/30 (2006.01)

CPC C08J 5/18 (2013.01) [C08F 116/06 (2013.01); C08K 5/053 (2013.01); C08L 29/04 (2013.01); G02B 5/3033 (2013.01); C08J 2329/04 (2013.01); C08J 2471/02 (2013.01)]

8 Claims

1. A polyvinyl alcohol film comprising a vinyl alcohol-based polymer,

wherein, when the polyvinyl alcohol film is measured by a solid echo method using pulse NMR at 80° C. for waveform separation of a free induction decay curve of 1H spin-spin relaxation into three curves derived from three components a component A, a component B, and a component C in order of short relaxation time, the component A has:

a resulting relaxation time of 0.0083 milliseconds or more and 0.0093 milliseconds or less, and

a resulting component ratio in the NMR of 18% or more and 35% or less, the component ratio being a ratio based on a total amount of the component A, the component B, and the component C.