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PROCESS FOR PREPARING FORMULAS OF OPTICAL WHITENERS, STABLE ON STORAGE; FORMULAS OBTAINED THEREFROM AND THEIR USE FOR OPTICAL GRINDING OF FIBROUS MATERIALS
PROCESS FOR PREPARING FORMULAS OF OPTICAL WHITENERS, STABLE ON STORAGE; FORMULAS OBTAINED THEREFROM AND THEIR USE FOR OPTICAL GRINDING OF FIBROUS MATERIALS
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机译:制备光学白酒配方的方法,贮存稳定;配方已获得并用于纤维材料的光学研磨
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摘要
A process is described for the preparation of concentrated liquid formulations, stable on storage, of anionic fluorescent brighteners, which process consists in passing a crude (for example obtained from synthesis) aqueous solution or dispersion of a fluorescent brightener containing sulfo groups, in particular a stilbene fluorescent brightener belonging to the group comprising bistriazinylaminostilbenedisulfonic acids, bis-styrylbiphenyls, bis-styrylbenzenes and bis-triazolylstilbenedisulfonic acids, is passed through a semipermeable membrane which contains ionic groups and has a pore diameter of 1-500 ANGSTROM in order to remove salts and by-products from the synthesis having molecular weights below 500 and in order to remove part of the water. The resulting concentrated preparation can, if desired, be concentrated further and/or treated with formulation assistants and, if desired, further additives.
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