US 11,713,365 B2 · Method for preparing modified conjugated diene-based polymer

Abstract

A method for preparing a modified conjugated diene-based polymer is provided. The method is characterized in adding a polyoxyethylene phosphate ester-based compound having a specific structure together with sulfur chloride modifier during modification, by which modification reproducibility may be markedly improved, stable process may be performed, the changing degree of the physical properties, specifically a Mooney viscosity increasing ratio and the degree of branching of a modified conjugated diene-based polymer according to modification conditions may be anticipated, and the changing degree of a Mooney viscosity increasing ratio and the degree of branching may be easily controlled by controlling modification conditions.

Claims13

Dependent claims

A method for preparing a modified conjugated diene-based polymer, comprising:

polymerizing a conjugated diene-based monomer in the presence of a rare earth metal catalyst composition to prepare an active polymer;
adding sulfur chloride and an additive comprising a compound represented by Formula 1 to the active polymer;
and
modifying the active polymer in the presence of the sulfur chloride and the additive:
wherein in Formula 1,
Rx is an aliphatic hydrocarbon group of 1 to 30 carbon atoms, an alkylaryl group of 7 to 30 carbon atoms, or an arylalkyl group of 7 to 30 carbon atoms,
Ry is a hydroxyl group (—OH), an aliphatic hydrocarbon group of 1 to 30 carbon atoms, an alkylaryl group of 7 to 30 carbon atoms, or an arylalkyl group of 7 to 30 carbon atoms, and
n is an integer of 1 to 20.

5 more elements

Dependencies are inferred from the claim text.

Method for preparing modified conjugated diene-based polymer

Life of this patent

Method for preparing modified conjugated diene-based polymer

Life of this patent

Abstract

Claims13