Carboxylated cellulose esters

Details Carboxylated cellulose esters Carboxylated cellulose esters

1998-02-06

1999-10-26

Lee, Howard C.

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

Organic compounds

Carbohydrates or derivatives

1061627, 10616271, 10616272, 10616801, 1061711, 536 64, 536 65, 536 68, 536 71, 536 76, C08B 300, C08B 316, C08L 104, C08L 108

Patent

active

059731397

ABSTRACT:
A process for preparing a carboxylated cellulose ester from oxidized cellulose is described. The carboxylated cellulose esters have improved solvent solubility and coating resin compatibility when compared to cellulose esters made from regular grade cellulose. The process comprises activating the oxidized cellulose with water. The activated oxidized cellulose is then dehydrated by displacing the water with acetic acid and optionally displacing at least some of the acetic acid with butyric acid or propionic acid. After dehydration the activated cellulose is reacted with an esterifying reagent in the presence of a catalyst at about 0.degree. C. The temperature is gradually increased to a level sufficient to complete reaction and to obtain an intrinsic viscosity ranging from about 0.2 to about 1.6 dl/g. The reacted solution is then hydrolyzed to obtain a hydroxyl content ranging from about 0.05 to about 1.0. The catalyst is neutralized with a neutralizing agent and the solution is optionally filtered and the carboxylated cellulose ester is then precipitated with a precipitating agent. The invention also relates to carboxylated cellulose esters prepared by the process described above as well as high solids coating compositions containing carboxylated cellulose esters made by the above process.

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