Fluorescent brighteners consisting of bis-styrylbenzene compound

Details Fluorescent brighteners consisting of bis-styrylbenzene compound Fluorescent brighteners consisting of bis-styrylbenzene compound

1990-05-10

1991-03-19

Niebling, John F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitriles

558399, 549475, 560 51, 25230122, C07C25500

Patent

active

050012533

ABSTRACT:
A fluorescent brightener is proposed which consists of 51-99% of an unsymmetrically substituted compound of the formula ##STR1## in which R and R.sub.1 are identical or different and, if R and R.sub.1 are identical, R.sub.1 must occupy a position in the phenyl ring to which it is bonded which differs from the position occupied by R in its phenyl ring, and in which R and R.sub.1 independently of one another are CN or a corboxylic acid ester group, and 49-1% of a symmetrically substituted compound of the formula ##STR2## in which R is as defined above and the two R's are bonded to identical positions in their phenyl rings, as are also agents which contain these fluorescent brighteners and the use of these fluorescent brighteners for the fluorescent brightening of, in particular, textile materials, preferably made of polyester. The said fluorescent brighteners are prepared by reacting terephthaladehyde preferably with a correspondingly substituted benzylphosphonate and further reacting the resulting mixture of a correspondingly substituted 4-stilbene aldehyde and a symmetrical p-bis-styrylbenzene with a benzylphosphonate which differs from the benzylphosphonate first used.

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