Patent GB-1066801-A (GB)
Title: Improvements relating to chromium complexes with saturated fatty acids
IPC: C09K3/18
Filed: 1963-11-14
Abstract: A 1% aqueous solution of a Werner complex, in which a trivalent nuclear chromium atom is co-ordinated with the carboxylic acido group of a saturated fatty acid having a solubility in water less than 0.1% by weight at 20 DEG  C., said complex being further characterized by having a basicity of 33 1/3 %, a ratio of chromium atoms to acido groups between 1 : 1 and 10 : 1 and a ratio of co-ordinated water to chromium atoms between 4.0: 1 and 5.0: 1 and which is obtained by heating in a monohydric aliphatic C1-4 alcohol, basic chromic chloride and a saturated fatty acid having a solubility in water less than 0.1% by weight at 20 DEG  C. in the presence of an amount of water less than 6% based upon the total weight of reaction mass, then heating a mixture of the reaction mass so obtained with sufficient water to provide a total water content of 8 to 50% at 35 DEG  to 70 DEG  C. for 20 to 75 minutes, which aqueous solution is adjusted to pH5 with caustic soda is employed to treat windows to remove frost.ALSO:Aqueous solutions of Werner complexes in which a trivalent nuclear chromium atom is co-ordinated with the carboxylic acido group of a saturated fatty acid having a solubility in water less than 0.1% by weight at 20 DEG  C., said complex being further characterized by having a basicity of 33 1/3 %, a ratio of chromium atoms to acido groups of 1:1 to 10:1, and a ratio of "co-ordinated water" (see below) to chromium atoms between 4.0:1 and 5.0:1, are prepared by heating in solution in a monohydric C1 to C4 aliphatic alcohol, basic chromic chloride (Cr.OH.Cl2) and a saturated fatty acid in the presence of water in an amount less than 6% based on the total weight of reaction mass, then mixing water with the reaction mass to provide a total water content of 8 to 50% on the same basis, and heating the resultant mixture at 35 DEG  to 70 DEG  C. for 20 to 75 minutes.  The term "co-ordinated water" is defined as meaning both water molecules per se and any hydroxyl groups which are bound to the chromium atom.ALSO:Paper and fabric are coated (1) by treatment with an aqueous solution of a Wemer complex in which a trivalent nuclear chromium atom is co-ordinated with the carboxylic acido group of a saturated fatty acid having a solubility in water less than 0.1% by weight at 20 DEG C, said complex being further characterised by having a basicity of 33 1/3 %, a ratio of chromium atoms to acido groups between 1:1 and 10:1 and a ratio of co-ordinated water to chromium atoms between 4.0:1 and 5.0:1 and which is obtained by heating in a monohydric aliphatic C1 to C4 alcohol, basic chromic chloride and a saturated fatty acid having a solubility in water less than 0.1% by weight at 20 DEG C in the presence of an amount of water less than 6% based upon the total weight of reaction mass, then heating a mixture of the reaction mass so obtained with sufficient water to provide a total water content of 8 to 50% at 35 DEG  to 70 DEG C for 20 to 75 minutes, and (2) drying the coated surface at ambient temperature to leave a water-repellant coating.