| 摘要 |
Ethers of carob-beam gum are made by reacting the gum with an alkylene oxide, an alkyl halide or an alkylene chlorhydrin in the presence of sodium hydroxide. The mixture may be neutralized with oxalic acid after the reaction is complete. Examples are given of the preparation of ethyl, hydroxyethyl and hydroxypropyl ethers. Specification 699,530 is referred to.ALSO:Aqueous solutions of synthetic surface-active substances are thickened by incorporating a water-soluble carob bean gum ether, preferably in concentrations of 0.5-5 per cent, the etherifying compound from which the ether is derived being free from ionogenic carboxyl groups. The surface-active substance may be an alkali metal, ammonium or triethanolamine alkyl sulphate, a paraffin sulphonate, an alkylaryl sulphonate or an ethylene oxide condensate with a higher fatty acid or alcohol, or with an alkylated phenol. The carob bean gum ether is preferably a hydroxy-alkyl ether (see Group IV (b)). The solutions may be dried to yield solid products which may thereafter be dissolved when required to give thickened solutions. Specification 699,530 is referred to.
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