PHYSICAL CHEMISTRY OF RESIN SOLUTIONS. PART II. NATURE OF RESIN SOLUTIONS IN ORGANIC SOLVENTS

Solutions of natural resins, particularly shellac in organic solvents like alcohol, acetone, etc. have been found to be non-colloidal since they rapidly dialyse out, pass through ultrafilters easily; are devoid of Tyndall effect and have considerable osmotic properties. The soft resin and pure resin of shellac are present in shellac as mechanical mixture since they diffuse in solution independently of each other. Pure resin of shellac has been found to be homonogeneous in molecular mass as it could not be separated into fractions with different melting points, and acid values, by dialysis