Stabilizer for bisphenols and process of using same

Details Stabilizer for bisphenols and process of using same Stabilizer for bisphenols and process of using same

1988-12-22

1990-01-16

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568701, 568703, 568724, C07C 3788

Patent

active

048944866

ABSTRACT:
Lactic, malic and glyceric acids have been found to be superior to the hydroxy acids here-to-fore employed for the stabilization of bisphenols. These hydroxy carboxylic acids or their ammonium or alkali metal salts can be added to the feed reactants used to make the bisphenols or to the reaction mixture after the reaction is complete or at any point in between. They are particularly useful when the bisphenol is exposed to high temperatures, e.g. during the separation of the bisphenol from the reaction mixture or in a melt.

REFERENCES:
patent: 2965539 (1960-12-01), Loper et al.
patent: 3629339 (1971-12-01), Schlichting et al.
patent: 3855150 (1974-12-01), Weris, III
patent: 4054611 (1977-10-01), Mimaki et al.
patent: 4160110 (1979-07-01), Carnahan, Jr.
patent: 4289587 (1981-09-01), Christena
patent: 4359590 (1982-11-01), Dachs et al.
Goerlitz, "Chemical Abstracts", vol. 87(1977), 119413.
Patzschke et al, "Chemical Abstracts", vol. 92(1979), 7930m.
Patricca et al., "Chemical Abstracts", vol. 96(1982), 124631h.

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