Patent GB-818373-A (GB)
Title: A bleaching and disinfectant composition and a process for the production thereof
IPC: C07D233/82
Filed: 1955-07-21
Abstract: A bleaching composition comprises from 5 to 20 parts by weight of a chlorinated dialkylhydantoin which contains less than 2 chlorine atoms in the molecule, at least 2 parts by weight of an hydrotropic agent for the chlorinated dialkylhydantoin and from 10 to 40 parts by weight of an alkaline buffer salt which may be sodium or potassium phosphate, tripolyphosphate, hexametaphosphate, pyrophosphate, dihydrogen phosphate, tetraborate or sesquicarbonate or mixtures thereof.  The composition may be produced by dispersing an aqueous slurry of the components in the form of fine particles in a hot stream of gas at a temperature above 212 DEG  F. to obtain a dried exterior on the particles of the slurry and maintaining the slurry in contact with the gas while not allowing the temperature of the particles to rise above 212 DEG  F. for a period during which not more than 20 per cent of the available chlorine is removed.  The hydantoin compound may be a chlorinated dimethyl-, diethyl-, or dipropyl hydantoin containing from 1.6 to 1.9 gram atoms of chlorine per mol.  The hydrotropic agent may be sodium toluene sulphonate, dibutyl naphthalene sodium sulphonate, the sodium salt of methylene bis (naphthalene sulphonic acid), sodium isopropyl naphthalene sulphonate or the corresponding magnesium or potassium salts.  The composition may also include an anionic or non-ionic surface active agent, other than an hydrotropic agent for the hydantoin compound, many such agents being specified, an inert or builder salt, e.g. anhydrous sodium sulphate, and an optical bleach.ALSO:A disinfectant composition comprises from 5 to 20 parts by weight of a chlorinated dialkylhydantoin which contains less than 2 chlorine atoms in the molecule, at least 2 parts by weight of a hydrotropic agent for the chlorinated dialkylhydantoin and from 10 to 40 parts by weight of an alkaline buffer salt which may be sodium or potassium phosphate, tripolyphosphate, hexametaphosphate, pyrophosphate, dihydrogen phosphate, tetraborate or sesquicarbonate or mixtures thereof.  The composition may be produced by dispersing an aqueous slurry of the components in the form of fine particles in a hot stream of gas at a temperature above 212 DEG  F. to obtain a dried exterior of the particles of the slurry and maintaining the slurry in contact with the gas while not allowing the temperature of the particles to rise above 212 DEG  F. for a period during which not more than 20 per cent of the available chlorine is removed.  The hydantoin compound may be a chlorinated dimethyl-, diethyl- or dipropyl hydantoin containing from 1.6 to 1.9 gram atoms of chlorine per mol.  The hydrotropic agent may be sodium toluene sulphonate, dibutyl naphthalene sodium sulphonate, the sodium salt of methylene bis-(naphthalene sulphonic acid), sodium isopropylnaphthalene sulphonate or the corresponding magnesium or potassium salts.  The composition may also include an anionic or non-ionic surface-active agent other than a hydrotropic agent for the hydantoin compound, many such agents being specified, an inert or builder salt, e.g. anhydrous sodium sulphate, and an optical bleach.