method for preparation of bis - stilbeenverbindingen, method of optical bleaching of organic materials.and werkwwijze for production of soaps and detergents under application of the bis - stilbeenverbindingen formed, and the obtained organic materials and the shaped pieces of soap or detergent.

摘要

Fluorescent bis-stilbene compds. for use as optical brighteners have formula (I). R1 - CH = CH - X - CH = CH - R2 X = a diphenyl group linked at the 4 and 4' positions with the CH group; and R1 and R2 = each monocyclic benzene groups, diphenyl groups or naphthalene groups; and at least one of the rings X, R1 and R2 is substd. by sulphonic acid, sulphone, carboxylic acid, nitrile, hydroxyl, mercapto or methyl. (I) are useful optical bighteners for treating org. materials, including synthetic polymers and fibres.