Sandoz Gmbh

Sandoz Ltd., (sandoz Ag)

Horst Schmid

Helmut A Moser

Paul Doswald

Emil J Moriconi

Fritz Fleck

Achim Wiedemann

Horst Aebli

Emmanuel Hervot

Peter Merk

Metal-free azo compounds of the formula ##STR1## wherein Ra is an aromatic group or an active methylene coupling component radical as defined in the specification,

1:1 and 1:2 metal complexes of sulfo group-free azo compound having on

Sulfo group-free azo compounds having on average at least 1.3 basic

Metal-free disazo compounds containing at least two basic

Disazo and polyazo compounds of the formula ##STR1## wherein each A is independently ##STR2## and each R.sub.3 is independently C.sub.1-4 alkyl, or

Sulfo group-free disazo and polyazo compounds containing two

Disazo and polyazo compounds of the formula ##STR1## wherein each A is independently ##STR2## and

Sulfo group-free disazo and polyazo compounds containing at least two

Disclosed is an optical brightening process for substrates comprising or consisting of synthetic polyamide in which the optical brightener is applied to the substrate by impregnation followed by heat treatment and wherein the brightener is applied in the presence of a compound or mixture of compounds of formula I,

Improved optical brightening of polyamides

This invention relates to new di-triazolylstyrene derivatives, useful as optical brighteners for organic polymeric materials, especially when applied to or incorporated in synthetic fibres.

Triazolylstyrene compounds

Disclosed are optical brightening agents of formula I, ##SPC1## wherein

Pyrazoline compounds useful as optical brighteners

The present invention provides novel compounds of the formula: ##SPC1## In which

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Reinach, Switzerland

Horst Schmid