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US 4,032,558 AGranted
Para-phenyl stilbene derivatives
AssigneeSandoz Ltd.
InventorsFritz Fleck, Hans Kittl, Salvatore Valenti
Life of this patent
Estimating the term…
Abstract
Stilbene derivatives having at least one further phenyl substituent in the para-position to a benzene ring in the stilbene are optical brighteners particularly suitable for incorporation on spinning masses.
Claims4
A compound of the formula, ##STR75## in which R.sub.1 and R.sub.5 are each hydrogen, nitrile or methyl,
- R.sub.2, r.sub.3, r.sub.4, r.sub.6, r.sub.7 and R.sub.8 are each hydrogen, fluorine, chlorine, methyl, methoxy, alkenyl of 2 to 4 carbon atoms, or nitrile, and
- p and q are integers from 1 to 3, with the provisos that
- the total of p and q is 4, 5 or 6,
- the total of p and q and the number of nitrile substituents is at least 5, and at least 1 of R.sub.1, R.sub.3, R.sub.5 and R.sub.7 is nitrile.
1 more element
A compound of the formula, ##STR76## in which p and q are integers 1 to 3 which total at least 3, R.sub.11, R.sub.13, R.sub.15 and R.sub.17 each signifies hydrogen or nitrile,
- provided the molecule contains 2 to 4 nitrile groups.
Dependencies are inferred from the claim text.