Abstract:
Polysaccharide derivatives in which some or all of the hydroxyl groups have been substituted by hydrophobic substituent(s) (A) having as the partial structure a C8-43 hydrocarbon group, and ionic hydrophilic substituent(s) (B) having as the partial structure at least one group selected from the group consisting of sulfonate, carboxyl, phosphate and sulfate groups and salts thereof, which have an average degree of substitution per constituting monosaccharide residue by the substituent (A), determined by Zeisel's method or the diazomethane method, of at least 0.0001 but less than 0.001 and an average degree of substitution per constituting monosaccharide residue by the substituent (B), determined by the colloidal titration method, of from 0.01 to 2.0. These derivatives are useful as chemical admixtures for hydraulic materials and give hydraulic compositions excellent in dispersibility and stability.
Abstract:
Una emulsión de aceite en agua obtenida mezclando (a) un derivado de polisacárido que tiene, en una cadena lateral, un grupo representado por la fórmula (1) -(OX)n-E 2 -R (1) en la que X representa un grupo hidrocarburo saturado divalente lineal o ramificado C1-C6, n es un número de 5 a 300, los X, cuyo número es n, pueden ser iguales o diferentes entre sí, E 2 representa un ligamiento éter (-O-) o un ligamiento éster (-OCO- o -COO-) y R representa un grupo hidrocarburo lineal o ramificado C4-C30 que puede estar sustituido con un grupo hidroxilo, (b) un poliol hidrosoluble, (c) un tensioactivo no iónico, (d) un compuesto hidrofóbico y agua, y diluir la mezcla resultante con agua, en la que el diámetro medio de partícula de las partículas emulsionadas es de 0,1 a 2 µm.
Abstract:
A process for producing an oil-in-water emulsion which comprises mixing a polymer having at least in a side chain a group represented by the formula (1): -(OX)n-E2-R (1) (wherein the n X's are the same or different and each represents C¿1-6?, linear or branched, divalent, saturated hydrocarbon group; n is a number of 5 to 300; E?2¿ represents an ether bond or oxycarbonyl (-OCO- or -COO-); and R represents optionally hydroxylated, C¿4-30?, linear or branched alkyl) with an aqueous solution of a water-soluble polyol and with a hydrophobic compound and diluting the resultant mixture with water; and an oil-in-water emulsion obtained by the process. The emulsion gives a good feeling upon application to the skin and has satisfactory stability.