Ultrathin membrane of polymethacrylate or polycrotonate and devi

Details Ultrathin membrane of polymethacrylate or polycrotonate and devi Ultrathin membrane of polymethacrylate or polycrotonate and devi

1990-10-01

1993-05-11

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

204290F, 21050028, B01D 6700

Patent

active

052098478

ABSTRACT:
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.

REFERENCES:
patent: 4208211 (1980-06-01), Bowden et al.
patent: 4275183 (1981-06-01), Kuzma
patent: 4554076 (1985-11-01), Speaker

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