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US 5,843,218 AGranted
Bisazo inkjet dyes
AssigneeZeneca Limited
InventorsPeter Gregory, Prahalad Manibhai Mistry, Roy Bradbury, Paul Wight
Life of this patent
Estimating the term…
Abstract
A bisazo dye of Formula (1) and salts thereof: ##STR1## wherein: R.sub.1 and R.sub.2 together with the carbon atoms to which they are attached form a 5- or 6- membered carbocyclic ring which is optionally substituted by SO.sub.3 H; R.sub.3 and R.sub.4 are each independently H or C.sub.1-4 -alkyl; y is 1, 2, 3 or 4; and n is 1, 2 or 3. The dyes are useful for ink jet printing.
Claims12
A bisazo dye of Formula (1) and salts thereof:
- ##STR10## wherein:
- R.sub.1 and R.sub.2 together with the carbon atoms to which they are attached form a 5- or 6 -membered carbocyclic ring which is optionally substituted by SO.sub.3 H;
- R.sub.3 and R.sub.4 are each independently H or C.sub.1-4 -alkyl;
- y is 1, 2, 3 or 4;
- and
- n is 1, 2 or 3.
3 more elements
Dependencies are inferred from the claim text.