US 11,981,772 B2
Polyoxymethylene and method of producing same
Chihiro Suemitsu, Tokyo (JP); Hitoshi Mizomoto, Tokyo (JP); Kenji Ebara, Tokyo (JP); and Tatsuya Suzuki, Tokyo (JP)
Assigned to ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
Appl. No. 17/275,755
Filed by ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
PCT Filed Sep. 10, 2019, PCT No. PCT/JP2019/035577
§ 371(c)(1), (2) Date Mar. 12, 2021,
PCT Pub. No. WO2020/054730, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 2018-172900 (JP), filed on Sep. 14, 2018; application No. 2018-172993 (JP), filed on Sep. 14, 2018; application No. 2018-172995 (JP), filed on Sep. 14, 2018; application No. 2018-172997 (JP), filed on Sep. 14, 2018; application No. 2019-020347 (JP), filed on Feb. 7, 2019; application No. 2019-120383 (JP), filed on Jun. 27, 2019; and application No. 2019-129907 (JP), filed on Jul. 12, 2019.
Prior Publication US 2022/0033558 A1, Feb. 3, 2022
Int. Cl. C08G 2/04 (2006.01); C08G 2/06 (2006.01); C08G 2/10 (2006.01); C08G 2/18 (2006.01)
CPC C08G 2/10 (2013.01) [C08G 2/04 (2013.01); C08G 2/06 (2013.01); C08G 2/18 (2013.01); C08G 2650/22 (2013.01); C08G 2650/38 (2013.01)] 16 Claims
 
1. Polyoxymethylene, wherein a ratio of a low molecular weight component having a molecular weight of 10,000 or less in a molecular weight distribution is 7.0% or less of the total, and the molecular weight distribution is obtained by measurement by gel permeation chromatography (GPC) using polymethyl methacrylate (PMMA) as a standard substance, and wherein the polyoxymethylene comprises 0.50 mass ppm or more and less than 100 mass ppm of boron atoms.