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1. (WO2018101342) PRODUCTION METHOD FOR METHACRYLIC COPOLYMER SOLUTION

Pub. No.:    WO/2018/101342    International Application No.:    PCT/JP2017/042845
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Nov 30 00:59:59 CET 2017
IPC: C08F 6/10
C08F 220/14
C08F 220/18
C08J 3/02
C10M 101/02
C10M 105/06
C10M 145/14
C10M 169/04
C10N 20/00
C10N 20/02
C10N 20/04
C10N 30/00
Applicants: KURARAY CO., LTD.
株式会社クラレ
Inventors: TAKAHASHI, Toru
高橋 享
OKABE, Fumihiko
岡部 史彦
NAKAHARA, Atsuhiro
中原 淳裕
Title: PRODUCTION METHOD FOR METHACRYLIC COPOLYMER SOLUTION
Abstract:
Provided is a method for efficiently producing a high-boiling-point solvent solution of a methacrylic copolymer having a narrow molecular weight distribution. Provided is a production method for a polymer solution that includes: a methacrylic copolymer (A) having a weight-average molecular weight of at least 100,000, a weight-average molecular weight / number-average molecular weight ratio of 1.01 to 1.8, and a glass transition temperature of 40°C or less, and containing a methyl methacrylate unit and a (meth)acrylate alkyl ester unit having a C10-36 alkyl group; and a solvent (B) having a boiling point of 200°C or more. Said production method includes: (I) a step for polymerizing a monomer in a solvent (C) having a boiling point of less than 200°C to prepare the methacrylic copolymer (A); and (II) a step for mixing the solution including the methacrylic copolymer (A) obtained from step (I) and the solvent (C) with the solvent (B), and subsequently removing the solvent (C) such that the solvent (B) content in the polymer solution is 10 mass% or more.