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Stabilization of ink compositions
| Details |
Inventors: Barlow, Jr., Fred D.; Chamberlin, Kim S.;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Dixon, Jr.; William R.
Assistant Examiner: Klemanski; Helene
Attorney, Agent or Firm: Reiter; S. E., Savitsky; Thomas R., Heath, Jr.; William P.
Ink compositions which are aqueous dispersions of a water-dispersible polymer, a Disperse dye, and a dihydroxybenzophenone or derivative thereof are stable with respect to precipitation. |
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DETAILED DESCRIPTION We claim: 1.
An ink composition, comprising: (A) 25 to 35 weight percent, based on the total weight of said composition, of a water-dispersible polymer having carbonyloxy linking groups, in the linear molecular structure wherein up to 80% of the linking groups are carbonylamido linking groups, the polymer having an inherent viscosity of at least about 0.
1 measured in a 60/40 parts by weight solution of phenol/tetrachloroethane at 25.
degree.
C.
and at a concentration of about 0.
25 grams of polymer in 100 ml of solvent, the polymer containing substantially equimolar proportions of acid equivalents (100 mole percent) to hydroxy and amino equivalents (100 mole percent), the polymer comprising the reaction product (i), (ii), (iii) and (iv) from the following components or ester-forming or esteramide-forming derivatives thereof: (i) at least one difunctional dicarboxylic acid; (ii) from about 4 to about 25 mole percent, based on the total of all acid, hydroxyl and amino equivalents being equal to 200 mole percent, of at least one difunctional sulfomonomer containing at least one sulfonate group attached to an aromatic nucleus wherein the functional groups are hydroxy, carboxy, or amino; (iii) at least one difunctional reactant selected from a glycol or a mixture of a glycol and diamine having two --NRH groups, the glycol containing two --CH.
sub.
2 --OH groups of which glycol (a) at least 15 mole percent, based on the total mole percent of hydroxy or hydroxy and amino equivalents, is a poly(ethylene glycol) having the structural formula: H--(OCH.
sub.
2 --CH.
sub.
2 --).
sub.
n --OH, n being an integer of between 2 and about 20, or (b) of which glycol from about 0.
1 to less than about 15 mole percent based on the total mole percent of hydroxy or hydroxy and amino equivalents, is a poly(ethylene glycol) having the structural formula: H--(OCH.
sub.
2 --CH.
sub.
2 --).
sub.
n --OH, n being an integer of between 2 and about 500, and with the proviso that the mole percent of said poly(ethylene glycol) within said range is inversely proportional to the value of n with said range; and (iv) from none to at least one difunctional reactant selected from a hydroxycarboxylic acid having one --CH
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