US 12,227,630 B2
Method of producing porous body of water-insoluble polymer
Kohei Matsunobu, Toyota (JP); Akio Minakuchi, Okazaki (JP); Hiroshi Uyama, Suita (JP); and Chiaki Yoshizawa, Suita (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 20, 2020, as Appl. No. 16/998,664.
Claims priority of application No. 2019-156314 (JP), filed on Aug. 29, 2019.
Prior Publication US 2021/0061970 A1, Mar. 4, 2021
Int. Cl. C08J 9/28 (2006.01)
CPC C08J 9/286 (2013.01) [C08J 9/28 (2013.01); C08J 2201/0502 (2013.01); C08J 2329/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of producing a porous body of a water-insoluble polymer, the method comprising the steps of:
preparing a solution in which a water-insoluble polymer is dissolved in a mixed solvent containing a good solvent for the water-insoluble polymer and a poor solvent for the water-insoluble polymer; and
removing the mixed solvent from the solution by vaporization, wherein
the poor solvent has a boiling point higher than a boiling point of the good solvent,
a porous body is obtained by removing the mixed solvent by vaporization to form pores,
the water-insoluble polymer is an ethylene-vinyl alcohol copolymer,
the good solvent is dimethyl sulfoxide or a mixed solvent of water and propyl alcohol,
the poor solvent is propylene carbonate, or an ether group-containing monool, and
the porous body is a separation membrane.