Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From fluorine-containing reactant
Patent
1997-02-21
1999-01-12
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From fluorine-containing reactant
528422, 528423, 55 16, 55528, 21050027, 21050028, 21050038, C08G 7324, C08G 7306
Patent
active
058591826
ABSTRACT:
A fluorine-containing polyquinazolone polymer having a bisquinazolone unit represented by Formula 1 as the repeating unit is used for a gas separation membrane so that great chemical and heat resistance is provided. The membrane also has great permeability and effective separability, as well as excellent mechanical strength. ##STR1## where R.sub.1 indicates a tetravalent organic group, R.sub.2 respectively indicate an alkyl group or an aromatic group, R.sub.3 indicates a divalent organic group, and R.sub.1 and/or R.sub.3 indicates an organic group having at least one fluorine atom.
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"New Linear Heterocyclic Polymers: Polypyrimidonequinazolones", J. Appl. Polym. Sic., vol. 60, Issue 169 (1962), pp. S59-S63.
Hachisuka Hisao
Ikeda Kenichi
Nitto Denko Corporation
Truong Duc
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