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Nippon Oil Fats Co., Ltd.

Norihiro Kaiya

Mikio Takagi

Yoshishige Murata

Takayuki Otsu

Naoyuki Amaya

Akira Yamada

Kiyotaka Shigehara

Kazuichi Tsuda

An ultrathin polymeric membrane has a membrane thickness of 10 to 1,000 .ANG.. The membrane is constituted of polycarboxylate and obtained by the spin coating method or by the Langmuir-Blodgett method. The polycarboxylate contains recurrent units represented by the formula (I) ##STR1## wherein R.sub.1 and R.sub.2 represent different groups and each stands for a methyl group or a hydrogen atom, and R represents a hydrocarbon group selected from the group consisting of a branched alkyl group having 3 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a substituted alkyl group having 2 to 6 carbon atoms, a substituted cycloalkyl group having 3 to 10 carbon atoms and a siloxanic hydrocarbon group.

Ultrathin membrane of polymethacrylate or polycrotonate and device

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Tsukuba, Japan

Norihiro Kaiya