# US 10,766,973 B2 · Method for producing polymer for electronic material and polymer for electronic material obtained by the production method

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- Number: US 10,766,973 B2
- Document ID: US10766973B2
- Status: Granted
- Kind: B2
- Application number: 15/735,748
- Filed: 2016-04-15
- Published: 2018-05-17
- Granted: 2020-09-08
- Earliest claimed: 2015-06-22
- Assignees: Maruzen Petrochemical Co., Ltd.
- Applicants: Maruzen Petrochemical Co., Ltd.
- Inventors: Tomohiro Masukawa; Ryo Fujisawa; Kazuhiko Haba; Satoshi Kakuta
- Web page: https://patentgrep.com/patent/US10766973B2

## CPC

- C08F 212/24: {Phenols or alcohols}
- C08F 6/02: Neutralisation of the polymerisation mass, e.g. killing the catalyst (short-stopping C08F2/42 ){also removal of catalyst residues}
- C08F 6/06: Treatment of polymer solutions {(C08F6/001, C08F6/006, C08F6/008, C08F6/02, C08F6/04 take precedence)}
- C08F 12/24: Phenols or alcohols
- C08G 8/04: of aldehydes
- C08G 12/26: with heterocyclic compounds
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Provided is a method for producing a polymer for an electronic material having a low content of metal ion impurities and a polymer for an electronic material obtained by such method. The method for producing a polymer for an electronic material according to the present invention comprises a polymerization step of obtaining a polymer by polymerizing a monomer(s) and a purification step of adding a strong acid having 0 or less pKa to the polymer solution and subsequently performing an ion exchange treatment to reduce the concentration of the metal ion impurities.

## Claims

### Claim 1

A method for producing a polymer for an electronic material comprising:
a polymerization step of obtaining a polymer by radical polymerizing an oxystyrene-based monomer with a (meth)acrylate-based monomer; and
a purification step of adding a strong acid having 0 or less pKa to the polymer solution and subsequently performing an ion exchange treatment to reduce the concentration of metal ion impurities.

### Claim 2 (depends on 1)

The method for producing a polymer for an electronic material according to claim 1, wherein
the strong acid is at least one selected from the group consisting of organic sulfonic acid, sulfuric acid, and trifluoroacetic acid.

### Claim 3 (depends on 1)

The method for producing a polymer for an electronic material according to claim 1, wherein
the strong acid is at least one organic sulfonic acid selected from the group consisting of trifluoro methanesulfonic acid, methanesulfonic acid, and p-toluenesulfonic acid.