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US 4,400,294 AGranted
Mixtures of optical brighteners
AssigneeHoechst Aktiengesellschaft
InventorsThomas Martini, Gunter Rosch
Life of this patent
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Abstract
Mixtures of optical brighteners consisting of (a) 1 to 99 weight % of one or several compounds of the formula 1 ##STR1## (b) 99 to 1 weight % of one or several compounds of the formula 2 ##STR2## wherein n is 0 or 1, X is oxygen or sulfur, B is a group of the formulae ##STR3## and the other substituents are defined a specified in the description.
Claims3
Mixtures of optical brighteners consisting essentially of 1 to 99 weight % of a compound of the formula ##STR22## and 99 to 1 weight % of a compound of the formula ##STR23## wherein:
- R.sub.1 and R.sub.2 are the same or different and are hydrogen or C.sub.1 -C.sub.4 alkyl,
- R.sub.3 is hydrogen or C.sub.1 -C.sub.9 alkyl, and
- B is a group of the formula --COOR.sup.5, wherein R.sup.5 is C.sub.1 -C.sub.18 alkyl, or B is ##STR24## wherein R.sup.6 is C.sub.1 -C.sub.6 alkyl.
Dependencies are inferred from the claim text.