Patent GB-457769-A (GB)
Title: A process for converting acids into stable colloidal systems
IPC: B01J13/00
Filed: 1935-05-29
Abstract: Labile hydrosols and hydrogels are obtained from milk-proteins by partial decomposition with acids, the reaction being interrupted before the formation of albumose and stabilized by the p  addition of antiseptics.  Fresh milk is treated with lactic acid cultures for 36--48 hours at 35--40 DEG  C.  The initial reaction is completed when the protein is precipitated in finely divided condition.  It is separated and dissolved in solvents such as ammonia, alkali, borax or sodium carbonate.  A small quantity of boric acid is then added and the solution stirred for 24 hours. An antiseptic, e.g. a silica xerogel containing fluorine is then added to stabilize the decomposition product, and the protein compound then precipitated with dilute lactic acid.  A mineral acid may be used instead of the lactic acid cultures, the time of treatment being reduced.ALSO:Dispersions of acids and acid reacting salts, in which no substantial proportion of water is present are obtained with the acid of labile hydrosols and hydrogels derived from milk-proteins by partial decomposition with acids, the reaction being interrupted before the formation of albumose and stabilized by the addition of antiseptics.  The protein derivative may be obtained by treating fresh milk with lactic acid cultures for 36--48 hours at 35--40 DEG C.  The initial reaction is completed when the protein is precipitated in finely divided condition.  It is separated and dissolved in solvents such as ammonia, alkali, borax or sodium carbonate.  A small quantity of boric acid is then added and the solution stirred for 24 hours.  An antiseptic, e.g. a silica xerogel containing fluorine, is then added to stabilize the decomposition product, and the protein compound is then precipitated with dilute lactic acid.  A mineral acid may be used instead of the lactic acid cultures,, the time of treatment being reduced.  Suitable acids which may be dispersed include boric acid, tartaric acid, salicylic acid, tannic acid, titanic acid, ichthyolic acid, ichthyolic sulphonic acid and p-oxybenzoic acid. Salts, particularly alkali and alkaline earth salts of organic acids of low molecular weight, may be added as stabilizers.  The dispersions may be diluted by the addition of powdered substances, e.g. zinc oxide or bolus, or of hydrocarbon emulsions.  The products may be used in chemical reactions or for the preparation of disinfectants, pest-exterminating agents, lubricants and other industrial dispersions.  The following products may be used as cosmetic pastes: (1) 25 pts. labile milk-protein prepared as described, 75 pts. boric acid and 15 pts. silica xerogel containing 7 per cent fluorine are dispersed in a suitable mill.  The product may be diluted as described above; (2) A dispersion is obtained in a similar manner from 10 pts. milk-protein, 66 pts. tartaric acid, 21 pts. tannic acid and 2.5 pts. fluorine containing silica gel.  The product may be diluted as above or by the addition of milk protein hydrosol; (3) A dispersion is obtained from 4 pts. labile milk-protein hydrogel, 21 pts. boric acid, 71 pts. salicylic acid and 4 pts. fluorine containing silica xerogel, 25 pts. of the product may be diluted with 75 pts. of a hydrocarbon emulsion to form a salvelike mass.ALSO:Dispersions of acids and acid-reacting salts in which no substantial proportion of water is present, and which may be used for the preparation of disinfectants, pest-exterminating agents or as cosmetic pastes, are obtained with the aid of labile hydrosols and hydrogels derived from milk-proteins by partial decomposition with acids, the reaction being interrupted before the formation of albumose and stabilized by the addition of antiseptics.  Suitable acids which may be dispersed include boric acid, tartaric acid, salicylic acid, tannic acid, titanic acid, ichthyolic acid, ichthyolic sulphonic acid and p-oxybenzoic acid. Salts, particularly alkali and alkaline-earth salts of organic acids of low molecular weight, may be added as stabilizers.  The dispersions may be diluted by the addition of powdered substances, e.g. zinc oxide or bolus, or of hydrocarbon emulsions.  The following products may be used as cosmetic pastes: (1) 25 pts. labile milk-protein, 75 pts. boric acid and 15 pts. silica xerogel containing 7 per cent fluorine and dispersed in a suitable mill. The product may be diluted as described above; (2) a dispersion is obtained in a similar manner from 10 pts. milk-protein, 66 pts. tartaric acid, 21 pts. tannic acid and 2,5 pts. fluorine-containing silica gel.  The product may be diluted as above or by the addition of milk protein hydrosol; (3) a dispersion is obtained from 4 pts. labile milk-protein hydrogel, 21 pts. boric acid, 71 pts. salicylic acid and 4 pts. fluorine-containing silica xerogel. 25 pts. of the product may be diluted with 75 pts. hydrocarbon emulsion to form a salve-like mass.