US 11,053,330 B2
Esterification method of copolymer
Chien-Tien Chen, Hsinchu (TW); and Yi-Ya Liao, Hsinchu (TW)
Assigned to NATIONAL TSING HUA UNIVERSITY, Hsinchu (TW)
Filed by NATIONAL TSING HUA UNIVERSITY, Hsinchu (TW)
Filed on Sep. 18, 2019, as Appl. No. 16/574,987.
Claims priority of application No. 107133173 (TW), filed on Sep. 20, 2018.
Prior Publication US 2020/0095348 A1, Mar. 26, 2020
Int. Cl. C08F 8/14 (2006.01)
CPC C08F 8/14 (2013.01) 15 Claims
 
1. An esterification method of a copolymer, comprising:
(A) mixing a copolymer having a carboxylic acid group, an alcohol or an aminoalcohol compound, a catalyst of formula (I) below, and a first solvent to obtain a first mixture:
[M(O)a]m+Xbn−  (I)
wherein M is an element selected from the group consisting of group IB, IVB, VB, VIB, VIIB, and VIIIB elements;
X is Cl, Br, I, OH, OAc, OC(O)Ar, OC(O)(CF2)cCF3, OC(O)C12H25, [(OSO2C6H4—CHCH2)n], OTf, OTs, SO4, SO3C12H25, acetylacetonate (acac), or a mixture thereof;
a is an integer from 0 to 3;
b is an integer from 1 to 4;
m is an integer from 2 to 4;
n is an integer from 1 to 2;
c is an integer from 1 to 6; and
Ar is a C6-20 aryl;
(B) converting the carboxylic acid group of the copolymer in the first mixture into an ester group at a predetermined temperature to obtain a reaction product; and
(C) adding the reaction product into a second solvent.