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US 4,904,765 AGranted
Dye mixtures containing an oil-soluble dye and an acid-extractable dye
AssigneeBASF SE
InventorsBernd Derber, Rudolf Denninger
Life of this patent
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Abstract
Dye mixtures contain an oil-soluble dye and a dye of the formula ##STR1## where D is phenyl which is unsubstituted or substituted by methyl or methoxy, R is hydrogen or methyl, R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl and R.sup.2 is C.sub.3 - or C.sub.4 -alkyl. The mixtures according to the invention are preferably used for coloring and marking mineral oil products.
Claims8
A dye mixture, comprising an oil-soluble dye and one or more dyes of the formula I:
- ##STR4## wherein D is phenyl which is unsubstituted or substituted by methyl or methoxy;
- R is hydrogen or methyl;
- R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl;
- and R.sup.2 is C.sub.3 - or C.sub.4 -alkyl, and wherein said dye of the formula I in said mixture is extractable from mineral oil products by aqueous or aqueous alcoholic hydrochloric acid.
1 more element
Dependencies are inferred from the claim text.