US 12,281,185 B2 · Anionic polymerization process and polymer production method

Abstract

A process for anionically polymerizing a (meth)acrylic acid in the presence of a tertiary organoaluminum compound (A), an organolithium compound (B) and at least one kind of a Lewis base (C) in a polymerization system. The tertiary organoaluminum compound (A) includes a tertiary organoaluminum compound (A1) having a chemical structure in which at least two of three unshared electrons of an aluminum atom are bonded to an aromatic ring via an oxygen atom, and the tertiary organoaluminum compound (A) has a molar ratio (A2)/(A1) in the range of 0% or above and 0.8% or below between a tertiary organoaluminum compound (A2) having a chemical structure in which at most one of three unshared electrons of an aluminum atom is bonded to an aromatic ring via an oxygen atom, and the tertiary organoaluminum compound (A1).

Claims20

Dependent claims

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%.

Dependencies are inferred from the claim text.

Anionic polymerization process and polymer production method

Life of this patent

Anionic polymerization process and polymer production method

Life of this patent

Abstract

Claims20