The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 2026
Filed:
Dec. 02, 2021
Central Glass Company, Limited, Ube, JP;
Central Glass Company, Limited, Ube, JP;
Abstract
Provided is a method for producing a fluorine-containing polymer with little lot-to-lot variation in weight average molecular weight. The method for producing a fluorine-containing polymer of the present invention relates to a method for producing a fluorine-containing polymer containing a repeating unit of formula (1) and a repeating unit of formula (2), which includes: fluorine-containing monomer synthesis including reacting a diol of formula (3) with at least one selected from the group consisting of unsaturated carboxylic acids, esters of the unsaturated carboxylic acids, acid halides of the unsaturated carboxylic acids, and anhydrides of the unsaturated carboxylic acids, to obtain a composition containing a fluorine-containing monomer of formula (4) as a main reaction product and a fluorine-containing monomer of formula (5) as a minor reaction product; fluorine-containing monomer purification including removing the fluorine-containing monomer of formula (5) from the composition to adjust the amount of the fluorine-containing monomer of formula (5), expressed in parts per million based on the mass of the fluorine-containing monomer of formula (4), to 1500 ppm or less; and polymerization including performing a polymerization reaction of the composition obtained after the fluorine-containing monomer purification to give the fluorine-containing polymer containing the repeating unit of formula (1) and the repeating unit of formula (2).