Patent GB-410126-A (GB)
Title: Manufacture of salts of organic esters of cellulose
IPC: C08B3/12
Filed: 1932-08-10
Abstract: Relates to the production of salts of cellulose acid esters of dicarboxylic acids.  (1) Salts of mixed acid esters such as cellulose acetate acid phthalate, are prepared by causing the acid derivative to react with a base, for example, by the addition to a solution of the cellulose derivative of a solution of an alkali metal hydroxide or of an alkylolamine, or by passing ammonia gas into the first-mentioned solution, or in the case of heavy metal salts by the addition of a solution of a water-soluble salt of such metal to a solution of an alkali metal salt of the mixed ester.  (2) Heavy metal salts of the simple cellulose acid esters of dicarboxylic acids, such as cellulose acid phthalate or succinate, are similarly prepared by causing the alkali salt of the cellulose derivative to react with a heavy metal salt, for example, by the addition of a solution of a heavy metal salt to a solution of cellulose sodium phthalate or succinate.  (3) Alkylolamine salts of the simple or mixed cellulose acid esters are causing the acid derivative to combine with an alkylolamine base.  In examples, acetone solutions of cellulose acetate phthalate and triethanolamine are mixed, the triethanolamine salt precipitating; dry ammonia gas is passed into an acetone solution of cellulose acetate phthalate; a solution of cellulose acetate phthalate in ethylene glycol monomethyl ether is neutralized by the addition of a solution of potassium hydroxide in the same solvent, and the potassium salt so formed is precipitated by pouring the mixture into acetone; an aqueous solution of calcium chloride is added to an aqueous solution of cellulose acetate potassium phthalate, and the calcium salt separated by pouring the mixture into methyl alcohol; aqueous solutions of copper sulphate, cobalt sulphate, zinc chloride, ferric chloride and silver nitrate are added to solutions of cellulose acetate potassium phthalate, in each case the respective heavy metal salt being precipitated out.  In the place of the heavy metal salts instanced above, there may be used the water-soluble salts of the metals of the copper group or of groups 2--8 of the periodic table.  Specification 410,125, [Group IV], is referred to.ALSO:Relates to the production of salts of cellulose and esters of dicarboxylic acids.  (1) Salts of mixed acid esters such as cellulose acetate acid phthalate, are prepared by causing the acid derivative to react with a base, for example, by the addition to a solution of the cellulose derivative of a solution of an alkali metal hydroxide or of an alkylolamine, or by passing ammonia gas into the first-mentioned solution, or in the case of heavy metal salts by the addition of a solution of a water-soluble salt of such metal to a solution of an alkali metal salt of the mixed ester.  (2) Heavy metal salts of the simple cellulose acid esters of dicarboxylic acids such as cellulose acid phthalate or succinate, are similarly prepared by causing the alkali salt of the cellulose derivative to react with a heavy metal salt, for example, by the addition of a solution of a heavy metal salt to a solution of cellulose sodium phthalate or cellulose sodium succinate.  (3) Alkylolamine salts of the simple and mixed cellulose acid esters are prepared by causing the acid derivative to combine with an alkylolamine base.  In examples, acetone solutions of cellulose acetate phthalate and triethanolamine are mixed, the triethanolamine salt precipitating; dry ammonia gas is passed into an acetone solution of cellulose acetate phthalate; a solution of cellulose acetate phthalate in ethylene glyco lmonomethyl ether is neutralized by the addition of a solution of potassium hydroxide in the same solvent, and the potassium salt so formed is precipitated by pouring the mixture into acetone; an aqueous solution of calcium chloride is added to an aqueous solution of cellulose acetate potassium phthalate, and the calcium salt separated by pouring the mixture into methyl alcohol; aqueous solutions of copper sulphate, cobalt sulphate, zinc chloride, ferric chloride and silver nitrate are added to solutions of cellulose acetate potassium phthalate, in each case the respective bearing metal salt being precipitated out.  In the place of the heavy metal salts instanced above, there may be used the water-soluble salts of the metals of the copper group or of groups 2--8 of the periodic table.  The alkali metal salts, which are water-soluble, may be employed for the manufacture of transparent sheets or skins, for use in adhesive compositions, as sizing materials, and as vehicles for dyes and pigments.  Processes for the manufacture of the cellulose acid esters are described in Specifications 410,118 and 410,125.