	US 12,281,185 B2
	Anionic polymerization process and polymer production method
Moe Kawahara, Tsukuba (JP); and Tomohiro Ono, Tsukuba (JP)
Assigned to KURARAY CO., LTD., Kurashiki (JP)
Appl. No. 17/271,431
Filed by KURARAY CO., LTD., Kurashiki (JP)
PCT Filed Aug. 22, 2019, PCT No. PCT/JP2019/032762 § 371(c)(1), (2) Date Feb. 25, 2021, PCT Pub. No. WO2020/045212, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-158446 (JP), filed on Aug. 27, 2018.
Prior Publication US 2021/0332163 A1, Oct. 28, 2021
Int. Cl. C08F 2/26 (2006.01); C08F 4/12 (2006.01); C08F 220/14 (2006.01); C08F 220/18 (2006.01); C08F 297/02 (2006.01); C08K 5/17 (2006.01); C08K 5/56 (2006.01)

CPC C08F 2/26 (2013.01) [C08F 4/12 (2013.01); C08F 220/14 (2013.01); C08F 220/1804 (2020.02); C08F 297/026 (2013.01); C08K 5/17 (2013.01); C08K 5/56 (2013.01); C08F 2438/00 (2013.01)]

20 Claims

1. A process, comprising:

anionically polymerizing a (meth)acrylic acid ester in the presence of a tertiary organoaluminum compound (A), 1-methylpropyllithium, and a Lewis base in a polymerization system, to produce a polymer,

wherein the tertiary organoaluminum compound (A) comprises isobutylbis(2,6-di-t-butyl-4-methylphenoxy)aluminum (A1) and diisobutyl(2,6-di-t-butyl-4-methylphenoxy)aluminum (A2), and

wherein an (A2)/(A1) molar ratio of the tertiary organoaluminum compound (A), based on moles of isobutylbis(2,6-di-t-butyl-4-methylphenoxy)aluminum (A1) and moles of diisobutyl(2,6-di-t-butyl-4-methylphenoxy)aluminum (A2) is in a range of from more than 0 to 0.8%.