Memjet Technology Limited

Zamtec Limited

Steven Carter

Adrian Peter Bisson

Kia Silverbrook

Damon Donald Ridley

Teruyuki Fukuda

Satoshi Tanaka

Alexander Grant

Iain Blake

Roger Davey

Richard Myors

Philippa Read

Roger Michael Davey

Stephen Bernard

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&#x2266;A/B&#x2266;1.2; and a polymer acid value of the polymeric dispersant is in the range of 100 to 170.

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

A method of minimizing kogation of a heater element in a thermal inkjet printhead. The method includes the steps of: (i) supplying an inkjet ink to a nozzle chamber of the printhead; and (ii) repeatedly actuating a heater element in the nozzle chamber so as to heat a portion of the ink to a temperature sufficient to form a bubble therein, thereby causing droplets of ink to be ejected from a nozzle opening associated with the nozzle chamber. The ink includes a styrene-acrylic copolymer having a glass transition temperature (Tg) in the range of 5 to 30&#xb0; C. and acid value in the range of 100 180 mgKOH/g, said styrene-acrylic copolymer minimizes kogation of the heater element.

Method of minimizing kogation in thermal inkjet printheads

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Sydney, Australia

Steven Carter