Method of printing pigment-based inks including ink sets, inks and printers therefor

US9834694B2 · kind B2 · utility

Assignee

• Memjet Technology Limited · IE

Inventors

• Teruyuki Fukuda · Wakayama, JP
• Satoshi Tanaka · Kyoto, JP
• Adrian Peter Bisson · Manchester, GB
• Roger Davey · Chatswood, AU
• Richard Myors · Sydney, AU
• Stephen Bernard · Sydney, AU
• Philippa Read · Sydney, AU
• Iain Blake · Sydney, AU
• Steven Carter · Sydney, AU

Key dates

• Filing date: Nov 4, 2014
• Grant date: Dec 5, 2017
• Expiry date: Mar 29, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41J2/2107
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of inkjet printing includes the steps of: printing a first ink onto a print medium, the first ink including a first self-dispersible pigment, the first ink having a first pigment content A; and subsequently printing a second ink onto the print medium at least partially over the first ink, the second ink including a second pigment and a polymeric dispersant encapsulating the second pigment, the second ink having a second pigment content B. The first self-dispersible pigment and the second pigment have a same color; the pigment content A of the first ink and the pigment content B of the overprinted second ink have a relationship 0.8≦A/B≦1.2; and a polymer acid value of the polymeric dispersant is in the range of 100 to 170.