Aqueous ink and use thereof
AssigneeFrancotyp-Postalia GmbH
InventorsThomas Gerhardt, Wolfgang Pekruhn, Georges Roussos
Life of this patent
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Abstract
The present invention includes an aqueous ink that has a composition which contains one or more dyestuffs, at least one alkanol with a straight or branched C3-C8-alkyl chain and between two and four hydroxyl groups, at least one C1-C6-alkyl ester of an ∝-hydroxycarboxylic acid of the formula R—C(OH)—COOH, wherein R is H or a straight or branched C1-C6-alkyl residue of a penetration agent, a surfactant, other adjuvants, and wherein the balance of the composition is water.
Claims21
A composition for an aqueous ink comprising:
- at least one dyestuff;
- at least one alkanol having a straight or branched C3-C8-alkyl chain and having at least one hydroxyl group;
- at least one C1-C6-alkyl ester of an α-hydroxycarboxylic acid having the formula R—C(OH)—COOH, wherein R is H or a straight or branched C1-C6-alkyl residue, as a penetration agent;
- and
- a balance of the composition comprising water.
A method of ink jet printing comprising the steps of:
- providing an aqueous ink composition comprising at least one dyestuff,
- at least one alkanol having a straight or branched C3-C8-alkyl chain and having at least one hydroxyl group,
- at least one C1-C6-alkyl ester of an a-hydroxycarboxylic acid having the formula R—C(OH)—COOH, wherein R is H or a straight or branched C1-C6-alkyl residue, as a penetration agent, and
- a balance of the composition comprising water;
- and
- ink jet printing the aqueous ink composition onto a substrate using ink jet technology.
A method for franking of postal items comprising the steps of:
- providing an aqueous ink composition comprising at least one dyestuff,
- at least one alkanol having a straight or branched C3-C8-alkyl chain and having at least one hydroxyl group,
- at least one C1-C6-alkyl ester of an α-hydroxycarboxylic acid having the formula R—C(OH)—COOH, wherein R is H or a straight or branched C1-C6-alkyl residue, as a penetration agent, and
- a balance of the composition comprising water;
- and
- printing a franking imprint on the postal item with the composition aqueous ink composition.
Dependencies are inferred from the claim text.