Water-Soluble Cellulose Derivatives Uses as Primareym Ulsifying Agents. Parti 1

Abstract

A study has been made of the effects of heat, acid and alkali, salts and alcohol on the stability of methyl‐, methylethyl‐ and sodium carboxymethyl‐cellulose emulsions of liquid paraffin. All were stable for 4 to 8 weeks at 40°, but at 80° deteriorated rapidly, the order of decreasing stability being methyl‐, methylethyl‐ and sodium carboxy‐methylcellulose emulsions. Heating at 115° for 30 minutes decreased the stability of sodium carboxymethylcellulose, but not of methyl‐ and methylethyl‐cellulose emulsions. Stability in the presence of added substances depended largely on the physical properties of the reaction products. The results are related to the behaviour under similar conditions of aqueous dispersions of the three derivatives, and the influence on emulsion stability of dehydration and degradation of the emulsifying agent is discussed.