Patent GB-1372861-A (GB)
Title: Compositions for the production of bleaching baths
IPC: C11D3/39
Filed: 1971-09-21
Abstract: 1372861 Bleaching activators HENKEL & CIE GmbH 21 Sept 1971 [28 Sept 1970 1 July 1971] 43854/71 Heading DIP [Also in Division C5] A composition for the production of a cold bleaching bath comprises: 3 to 100% by weight of a bleaching component comprising a mixture of an N-acyl or O-acyl compound which is an activator for H 2 O 2  or percompounds yielding H 2 O 2  in aqueous solution and having an activation value for the percompounds determined by titration as defined in the specification of at least 3, and an alkali metal silicate of the composition M 2 O:SiO 2 =1 to< 2:1 (M being an alkali metal) in such amount that at least 0.25 and not more than 3 alkali metal atoms are present per acyl group of the activator; and 97 to 0% by weight of other constituents of bleaching or bleaching washing compositions. The bleaching component may further comprise up to 20% by weight of a part ester of a fatty alcohol (10 to 22C) or an ethoxylation and/or propoxylation product thereof containing 1 to 10 glycol ether groups in the molecule, with ortho-pyro- or polyphosphoric acid, or a water soluble salt thereof. Additionally the composition may comprise 0 to 20% by weight of additives for percompounds, selected from stabilisers, complex-forming compounds and corrosion inhibitors, e.g. those of the triazole or tetrazole type which contain an =NH or =NOH group. The composition may be formulated as a bleaching composition comprising 3 to 100% by weight of the bleaching component as defined above and such amount of at least one percompound yielding H 2 O 2  in aqueous solution, e.g. perborate, that at least 0.1 and not more than 4 gram moles of activator are present per gramatom of oxygen available for activation, and 97 to 0% by weight of a neutral or alkalinereacting builder substance and a corrosion inhibitor and/or percomplex-forming compound. Specified activators include acylated glycol urils, e.g. tetraacetyl glycol uril, tetrapropionyl glycol uril, methyltriacetyl glycol uril and diacetyl dibenzoyl glycol uril. Many other N- or O-acyl activators are mentioned. The silicates preferably have a composition of 1.5 M 2 O:1SiO 2  (sesquisilicates) where M is sodium or potassium. The phosphate ester may be made from the alcohols derived from coconut, palm kernel or tallow fatty acids, may comprise mixtures of esters with one or two alcohol residues per phosphorus atom and may be in the form of diethanolamine or triethanolamine salts. The per compounds may be perborates. The composition may alternatively be formulated as a steeping composition containing 0-5% by weight of a surface active component, 97-55% by weight of a builder component comprising alkaline-reacting builder substances including sesquisilicates and optionally corrosion inhibitors and organic copper complex-forming compounds and 3-40% by weight of the bleaching component. Alternatively the composition may be formulated as a bleaching pre-washing or washing composition containing 5-40% by weight of a surface active component containing at least one surface active compound selected from sulphonates, sulphates, soaps, non-ionic and/or phosphoric acid esters; and at least one of the following substances: 0-10% by weight of foam stabilisers and 0-10% by weight of non- surface-active foam inhibitors, 10-92% of the builder component, 3-40% by weight of the bleaching component and 0-20% by weight of other washing composition constituents, e.g. textile softeners, corrosion inhibitors, anti-microbial substances, dirt carriers, brighteners, enzymes, perfume, dyestuffs and water. The surface-active component preferably contains 15-99% by weight of sulphonates and/or sulphates (8-18C in the hydrophobic residue), 10-60% by weight of non-ionics, 1-60% by weight of phosphoric acid esters and at least one of the following substances: 5-70% by weight of soap, 0-10% by weight of foam stabilisers and 0-10% by weight of non- surface-active foam inhibitors. The foaming power may be further controlled by the presence of different types of surfactants, e.g. anionics and non-ionics. Combinations of foam inhibitors and foam stabilisers (which may be of the anionic or betaine type) may be used to give products in which the amount of foam is reduced as the temperature rises. The activators may be provided with an inert coating.