| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a container that allows gas concentration to be adjusted to a desired value with a simple structure and reduces a heat load upon adjustment of the gas concentration. <P>SOLUTION: In the reefer container 1 which is ventilated via a ventilation filter 24, the ventilation filter comprises an asymmetric membrane formed by a polymer material obtained by polymerizing a monomer composition containing a monomer represented by formula (1). (in formula, R<SP POS="POST">1</SP>mutually independently denotes 1C-12C alkyl group and/or 6C-10C aryl group, X denotes a prescribed siloxy group, a denotes an integer of 1 to 3 and b denotes an integer of 0 to 2). <P>COPYRIGHT: (C)2012,JPO&INPIT |
