# US 2017/0283540 A1 · Method for producing anionic polymer

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- Number: US 2017/0283540 A1
- Document ID: US20170283540A1
- Status: Published application
- Kind: A1
- Application number: 15/508,773
- Filed: 2015-09-03
- Published: 2017-10-05
- Earliest claimed: 2014-09-04
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Yasuhiro HATANAKA; Tomoaki TSUJI; Syuichi SUNAGA
- Web page: https://patentgrep.com/patent/US20170283540A1

## CPC

- C08F 297/04: polymerising vinyl aromatic monomers and conjugated dienes
- C08F 2/06: Organic solvent
- C08F 36/06: Butadiene
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Provided is a method for producing an anionic polymer in an industrially advantageous manner, whereby at the time of anionically polymerizing monomers using a solvent whose boiling point at atmospheric pressure is higher than the polymerization temperature, temperature control can be achieved by quickly removing the heat of the polymerization reaction using a simple device. The method for producing an anionic polymer includes anionically polymerizing a conjugated diene, an aromatic vinyl compound, or a mixture thereof under a condition where the amount of an inert gas present with respect to 1 kg of a solvent whose boiling point at atmospheric pressure is higher than the polymerization temperature is 20 mmol or less.

## Claims

### Claim 1

A method for producing an anionic polymer, the method comprising:
anionically polymerizing a conjugated diene, an aromatic vinyl compound, or a mixture thereof under a condition where an amount of an inert gas present with respect to 1 kg of a solvent whose boiling point at atmospheric pressure is higher than the polymerization temperature is 20 mmol or less.

### Claim 2 (depends on 1)

The method according to claim 1, wherein an organic alkali metal compound, or a living copolymer formed by the polymerization of any one of one or more kinds of conjugated diene, one or more kinds of aromatic vinyl compound, and one or more kinds of conjugated diene and one or more kinds of aromatic vinyl compound using the organic alkali metal compound is used as an initiator for anionic polymerization.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the polymerization is performed in a complete mixing-type reaction vessel having a reflux condenser having an A/V ratio of the heat transfer area A (m2) of the reflux condenser to the inner volume V (m3) of the reaction vessel of 20 to 0.1.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the anionic polymerization is performed at a reaction temperature ranging from 20° C. to 110° C.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the solvent comprises 50% by mass or more of cyclohexane.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the anionic polymer is a block copolymer.