Method for producing thermoplastic resin
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsYuri GOTO TAKAGI, Eiji KOSHIISHI, Hidetaka SHIMIZU, Hirohito ISHIZUKA, Munenori SHIRATAKE, Takuma YOSHIDA, Tomoya HOSOKAWA
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Abstract
The present invention can provide a method for producing a thermoplastic resin including a structural unit derived from 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene (BPEF) represented by the depicted structural formula, the method being characterized by using the BPEF as a raw material, the BPEF containing 0.8 ppm or less of sulphate ions (SO42−), 10 ppm or less of sodium ions (Na+), and 0.01 ppm or more of calcium ions (Ca2+).
Claims8
A method for producing a thermoplastic resin comprising a structural unit derived from 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene (BPEF) represented by a structural formula below, which comprises using the following BPEF as a raw material, wherein
- the BPEF contains 0.8 ppm or less of sulphate ions (SO42−),
- the BPEF contains 10 ppm or less of sodium ions (Na+), and
- the BPEF contains 0.01 ppm or more of calcium ions (Ca2+):
Dependencies are inferred from the claim text.