Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1989-08-02
1991-01-22
Raymond, Richard L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
562488, C07D26120
Patent
active
049872389
ABSTRACT:
A process for the preparation of high-purity perfluorinated compounds, specifically of an aromatic tetracarboxylic acid and its anhydride, 5,5'-[2,2,2-trifluoro-1-(trifluoromethyl)-ethylidene]bis-1,3-isobenzofuran dione, by a multi-step treatment of the crude compounds. The metal ion content of the compounds treated is reduced considerably. After polymerization with an aromatic diamine, the anhydride is used in microelectronics.
REFERENCES:
patent: 3310573 (1967-03-01), Coe
patent: 4906760 (1990-03-01), Mueller et al.
Chemical Abstract, vol. 100, #91886r, Grabchak et al., "Equilibrium Exchange of Ions on Activated Carbons", 1984.
Chemical Abstract, vol. 104, #149653p, Sei et al, "Purification of Aromatic Polyesters", 1985.
Chemical Abstract, vol. 96, #205,865q, Groshkov, "Ways of Increasing the Efficiency of Ion Exchange Methods for Mixture Separation and Substance Purification", 1982.
Chemical Abstract, vol. 105, #8461h, Szolcsanyi et al., "Prospective Principle of Separation of Chemical Components", 1986.
Covington Raymond
Hoechst Aktiengesellschaft
Raymond Richard L.
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