Cellulose esters and salts thereof

Details Cellulose esters and salts thereof Cellulose esters and salts thereof

1990-12-04

1994-12-06

Kight, III, John

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

Organic compounds

Carbohydrates or derivatives

536 64, 536 76, 536124, C08B 316, C08B 322

Patent

active

053712110

ABSTRACT:
Cellulose esters of polycarboxylic acids, and their salts, such as the hydrogen cellulose ester of succinic acid, and the potassium salts thereof, are known to be useful in the preparation of conductive layers in composite such as photographic films. This invention comprises the discovery that such esters and salts provide improved conductive layers, if made from amorphous cellulose obtained by deacylating a material (such as cellulose acetate) using a lower alcohol as the deacylating agent, and an alkali metal alkoxide as the catalyst. Thus, the conductivity of potassium cellulose succinate (KCS) is improved, if made from a cellulose produced as described above. Furthermore, gelatin/KCS coating solutions made from improved KCS coating solutions of this invention have lower viscosities; this makes them much more suitable for roll coating, a support to be coated such as by a skim pan--air knife technique.

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