Bis-stilbene compounds
AssigneeCiba-Geigy Corporation
InventorsKurt Weber, Peter Liechti, Hans Rudolf Meyer, Adolf Emil Siegrist
Life of this patent
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Abstract
The present invention provides the new bis-stilbene compounds, which are useful as optical brighteners and correspond to the formula R.sub.1 -- CH = CH -- X -- CH = CH -- R.sub.2 in which X represents a diphenyl residue bound in positions 4 and 4' to the =CH-- groups; R.sub.1 and R.sub.2 independently of each other, each represents a monocyclic benzene residue, a diphenyl, naphthyl or pyridyl residue, and in which at least one of the cyclic systems R.sub.1, R.sub.2, X contains a possibly functionally modified sulphonic acid group, a sulphone group, a possibly functionally modified carboxylic acid group, a nitrile, hydroxyl, mercapto or methyl group.
Claims23
A bis-stilbene compound of the formula ##SPC138##
- wherein A' represents an .alpha.-naphthyl, .beta.-naphthyl, pyridyl or 4-diphenylyl radical or a radical of formula ##SPC139##
- wherein X.sub.1 represents hydrogen, an alkyl group containing 1 to 4 carbon atoms halogen or alkoxy with 1 to 4 carbon atoms, X.sub.2 and X.sub.3 represent hydrogen, an alkyl group containing 1 to 4 carbon atoms, halogen, or alkoxy with 1 to 4 carbon atoms or X.sub.2 together with X.sub.3 forms a methylenedioxy group, M represents a salt-forming cation and Y represents a hydrogen atom, halogen, an alkyl group containing 1 to 4 carbon atoms or an alkoxy group containing 1 to 4 carbon atoms.
A symmetrical bis-stilbene compound of the formula ##SPC149##
- in which
- V.sub.1 represents hydrogen or a substituent Q representing a member selected from the group consisting of a sulphonic acid group or a salt thereof;
- V.sub.2 represents hydrogen, an alkyl group with 1 to 18 carbon atoms, an alkoxy group with 1 to 12 carbon atoms, halogen or a sulphonic acid group or a salt thereof;
- V.sub.3 represents hydrogen or an alkyl group with 1 to 4 carbon atoms;
- W.sub.1 represents an alkyl group containing 1 to 4 carbon atoms, an alkoxy group with 1 to 4 carbon atoms, halogen, or a substituent Q representing a member selected from the group consisting of a sulphonic acid group or a salt thereof, on condition that at least one of the symbols V.sub.1 or W.sub.1 has the significance of a substituent Q.
A symmetrical bis-stilbene compound of the formula ##SPC152##
- in which V.sub.1 represents a sulphonic acid group or a salt, or an ester, thereof;
- V.sub.2 represents hydrogen, an alkyl group with 1 to 18 carbon atoms, an alkoxy group with 1 to 12 carbon atoms, halogen or a sulphonic acid group or a salt, ester thereof, and V.sub.3 stands for hydrogen or an alkyl group with 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.