Nouveaux composés organiques convenant comme agents de blanchiment et leur préparation

摘要

4-Alkoxynaphthalimides of formula where R is C1- 5-alkoxy and R1 is hydrogen alkyl, hydroxyalkyl, aminoalkyl, aralkyl, cycloalkyl, aryl, alkaryl or heterocyclic, the aryl group being optionally substituted by halogen, hydroxyalkyl, alkylamino, alkoxy or -SO3M, where M is hydrogen or an alkali metal are added as optical brightening agents to polyamides, polyesters, polyurethanes, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile or polyvinyl alcohol.ALSO:The invention comprises compounds of for mula where R is C1- 5 alkoxy, and R1 is hydrogen, alkyl, hydroxyalkyl, aminoalkyl, aralkyl, cycloalkyl, aryl, alkaryl or a heterocyclic group, the aryl group being optionally substituted by halogen, hydroxyalkyl, alkylamino, alkoxy or -SO3M, where M is hydrogen or alkali metal. Specified heterocyclic radicals are 2,6-dihalo-5-triazinyl, pyridyl and pyrazolyl. The compounds may be prepared by reacting a 4-alkoxy-1,8-naphthalic acid or its anhydride with a compound R1NH2 or by reacting a compound of formula where X is halogen, hydroxy, nitro or sulpho with an alkali metal alcoholate, or where X is hydroxy with a dialkyl sulphate or alkyl halide or where X is amino, converting this to the diazonium salt and reacting this with an alcohol ROH. Alternatively compounds in which R1 is hydrogen can be reacted with alkyl &c. halides to convert R1 into other values. The products are used as optical brightening agents. The diazonium chlorides of a number of 4-aminonaphthalimides are prepared (Example 28). The sodium salts of a number of 4-sulphonaphthalimides are prepared by reacting the sodium salt of 4-sulphonaphthalic acid with methylamine, butylamine, ethanolamine, benzylamine, cyclohexylamine, p-diethylamino-aniline, aniline, 2-ethylhexylamine and 3-dimethylaminopropylamine.ALSO:4-Alkoxynaphthalimides of formula where R is C1-5 alkoxy, and R1 is hydrogen, alkyl, hydroxyalkyl, aminoalkyl, aralkyl, cycloalkyl, aryl, alkaryl or a heterocyclic group (particularly 2, 6-dihalo-s-triazinyl), the aryl group being optionally substituted by halogen, hydroxyalkyl, alkylamino, alkoxy, or -SO3M where M is hydrogen or an alkali metal, are used as optical brightening agents for textile materials. Specied are filaments, yarns, threads, and ribbons of cotton, capoc, linen, sisal, jute, wool, mohair, cashmere, asbestos, viscose rayon, cellulose acetate, polyamides, polyesters, polyurethanes, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyvinyl alcohol and glass fibre. They may be used as aqueous or other solutions or dispersions with or without a dispersing agent. In Example 34, 4-methoxynaphthalimide is incorporated in a sodium hypochlorite bleach solution containing acetic acid and a chlorous dioxide gas generation inhibitor. Other compositions contain surfactant, carboxymethylcellulose, chlorobenzene-type carrier.