Method for producing polymer

摘要

The present invention is related to a method for producing a polymer to efficiently remove metal residues of at least lithium and/or titanium from a polymer solution comprising the at least lithium and/or titanium to thereby obtain a refined polymer solution having little metal residue.

主权项

1. A method of producing a polymer, comprising:
step 1 of preparing a polymer solution comprising at least (i) titanium or (ii) lithium and titanium; step 2 of adding and mixing water in a volume 0.1 to 20 times a volume of the polymer solution and an organic acid compound of formula (1) to the polymer solution to thereby obtain a mixed liquid, wherein the mixing is carried out by using a rotary dispersing machine having a meshing structure; and step 3 of removing a water phase from the mixed liquid to thereby obtain a refined polymer solution, wherein said formula (1) is represented bywherein each of R1, R2 and R3 independently consists of a single element or a plurality of elements selected from the group consisting of C, H, O and N, and
wherein the organic acid compound comprises 4 or more oxygen atoms in the molecule, and said organic acid compound of formula (1) is the only acid compound mixed with the polymer solution.