	US 12,448,469 B2
	Polyvinyl alcohol-based polymer
Akihiro Yamashita, Tokyo (JP)
Assigned to DENKA COMPANY LIMITED, Tokyo (JP)
Appl. No. 17/927,523
Filed by DENKA COMPANY LIMITED, Tokyo (JP)
PCT Filed Jul. 15, 2021, PCT No. PCT/JP2021/026688 § 371(c)(1), (2) Date Nov. 23, 2022, PCT Pub. No. WO2022/024791, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-131225 (JP), filed on Jul. 31, 2020.
Prior Publication US 2023/0242687 A1, Aug. 3, 2023
Int. Cl. C09K 8/467 (2006.01); C04B 24/26 (2006.01); C08F 16/06 (2006.01)

CPC C08F 16/06 (2013.01) [C04B 24/2623 (2013.01); C09K 8/467 (2013.01); C08F 2810/00 (2013.01)]

4 Claims

1. A polyvinyl alcohol-based polymer, comprising a saponificated product of

a copolymer of a vinyl ester monomer and a polyfunctional monomer,

wherein the polyvinyl alcohol-based polymer has a slope of 1.2 or less in a double logarithmic plot of storage elastic modulus G′ (at 20° C.) in an angular frequency region of 1.0 to 10.0 rad/s, in measurement of an aqueous solution of the polyvinyl alcohol-based polymer filtered through a 100-mesh filter (opening: 0.154 mm) and then adjusted to a concentration of 10.0 mass %.