Pigment-based ink formulations having improved printhead lifetime

US11441044B2 · kind B2 · utility

Assignee

• Memjet Technology Limited · IE

Inventors

• Simon Fielder · Sydney, AU
• Alison Chong · Chatswood, AU
• David Tyvoll · Village of La Jolla, US
• Tim Hudson · Chatswood, AU
• Roger Davey · Chatswood, AU
• Ellaine Munton · Chatswood, AU

Key dates

• Filing date: Aug 23, 2019
• Grant date: Sep 13, 2022
• Expiry date: Apr 2, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D11/40
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An aqueous-based inkjet ink for a thermal inkjet printhead includes: a pigment; 2 to 90 ppm ammonium ions; and an ink vehicle. The ink has a pH in the range of 8 to 9.5 and exhibits improved lifetime in thermal inkjet printheads with minimal loss of print quality.