发明名称 |
Method for producing polyester resin |
摘要 |
The present invention provides a method for producing a polyester resin comprising dicarboxylic acid units and diol units, wherein at least a portion of the diol units is a diol unit having a cyclic acetal skeleton, the method comprising specific steps (1) to (4-2). |
申请公布号 |
US9206286(B2) |
申请公布日期 |
2015.12.08 |
申请号 |
US201314402907 |
申请日期 |
2013.05.30 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
Yamauchi Tatsuya;Edahiro Junichi;Kushida Yasuhiro;Morishita Takami |
分类号 |
C08G63/78;C08G63/672;C08G63/685 |
主分类号 |
C08G63/78 |
代理机构 |
Greenblum & Bernstein, P.L.C. |
代理人 |
Greenblum & Bernstein, P.L.C. |
主权项 |
1. A method for producing a polyester resin comprising a dicarboxylic acid unit and a diol unit, wherein at least a portion of the diol unit is a diol unit having a cyclic acetal skeleton, the method comprising the following steps (1) to (4-2):
step (1) of reacting any one or more compounds selected from the group consisting of a dicarboxylic acid (G), a polyester resin comprising a dicarboxylic acid (G) and a diol (B) having no cyclic acetal skeleton, and a dicarboxylic acid dialkyl ester (E), with a diol (B) having no cyclic acetal skeleton to obtain a dihydroxyester (F) represented by the following formula (1); step (2) of subjecting the dihydroxyester (F) to transesterification reaction with a diol (A) having a cyclic acetal skeleton to obtain an oligomer; step (3) of polymerizing the oligomer; step (4-1) of distilling off a diol mixture (C) comprising the component (B) and/or the component (A) in the step (2) and/or the step (3), and decomposing the component (C) under a pH condition of 10 or lower such that a concentration of the component (A) in the component (C) is 0.5% by mass or lower; and step (4-2) of distilling the component (C) after the step (4-1) to obtain a purified diol (B1) comprising the component (B): (wherein R1, R2, and R3 each independently represent any divalent substituent selected from the group consisting of an aliphatic hydrocarbon group having 1 to 10 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, and an aromatic hydrocarbon group having 6 to 10 carbon atoms; and n is 1 or more and 200 or less). |
地址 |
Tokyo JP |