FIELD: chemistry.
SUBSTANCE: invention relates to water-soluble hydroxyethyl cellulose and derivatives thereof. Hydroxyethyl cellulose and derivatives thereof are characterised by ratio of unsubstituted trimers less than approximately 0.21, hydroxyethyl molar substitution between approximately 0.7 and 1.3 and water-solubility of over 90%. Hydroxyethyl cellulose is obtained using a suspension method. Cellulose, water and alkali are mixed and react in an organic solvent. Molar ratio of water to anhydroglucose in the prepared alkaline cellulose mixture lies between approximately 5 and 35, and molar ratio of alkali to anhydroglucose is greater than approximately 1.6. Ethylene oxide is added. A sufficient amount of acid is continuously added so as to reduce the molar ratio of alkali to anyhydroglucose to at least approximately 0.4 and preferably higher than approximately 0.04 while simultaneously reacting ethylene oxide with alkaline cellulose. If needed, at least one deriving agent is added to obtain modified hydroxyethyl cellulose. A viscosity lowering agent is then added. This water-soluble hydroxyethyl cellulose and its derivatives are used in compositions for personal care agents, compositions for household care agents, pharmaceutical compositions, building compositions, emulsion polymerisation compositions, compositions of working fluids for oil fields, compositions of working fluids for civil engineering, compositions for coating paper, compositions for making paper, compositions for applying architectural coatings, compositions for applying industrial coatings, compositions for printing ink, adhesive compositions and compositions for processing and extracting minerals.
EFFECT: obtained hydroxyethyl cellulose and its derivatives is more efficient when concentrating aqueous systems than existing hydroxyethyl cellulose products, and demonstrates unique rheological properties in systems with low water activity.
34 cl, 8 ex, 16 tbl, 24 ex, 1 dwg
