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US 4,363,744 AGranted
Mixtures of optical brighteners and their use for the optical brightening
AssigneeHoechst Aktiengesellschaft
InventorsDieter Gunther, Rudiger Erckel, Gunter Rosch, Heinz Probst
Life of this patent
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Abstract
Mixtures of optical brighteners consisting of from (a) 0.98 to 0.50 part by weight of a mixture consisting of from 0.05 to 0.95 part by weight of a brightener of the series of the benzoxazolyl-stilbenes and of from 0.95 to 0.05 part by weight of a brightener of the series of the aryltriazoles and (b) of from 0.02 to 0.5 part by weight of a brightener of the series of the bis-benzoxazolyl-stilbenes or of the bis-benzothiazolyl-stilbenes.
Claims4
Mixtures of optical brighteners consisting essentially of from
- (a) 0.98 to 0.50 part by weight of a mixture consisting essentially of from 0.05 to 0.95 part by weight of a compound of the formula I ##STR16## wherein R.sup.1 is hydrogen or C.sub.1 -C.sub.4 alkyl;
- R.sup.2 is in the 6- or 7-position and is hydrogen or C.sub.1 -C.sub.4 alkyl;
- and A is selected from the following formulas:
- --CN, --COOH, --COOCH.sub.3, ##STR17## R.sup.4 being C.sub.1 -C.sub.4 alkyl or .beta.-hydroxyethyl;
- and of from 0.95 to 0.05 part by weight of a compound of the formula II ##STR18## and of from (b) 0.02 to 0.5 parts by weight of a compound of the formula III ##STR19## wherein R.sub.3 is hydrogen or C.sub.1 -C.sub.4 -alkyl.
2 more elements
Dependencies are inferred from the claim text.