Primer compositions for liquid electrophotographic printing and methods associated therewith

EP4758207A1Pending Publication Date: 2026-06-17MICHELMAN INC
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
MICHELMAN INC
Filing Date
2024-08-05
Publication Date
2026-06-17

AI Technical Summary

Technical Problem

Liquid electrophotographic printing systems face challenges with poor image adhesion to base substrates, even when using primer coatings, due to differential adhesion to various ink colors and the difficulty in achieving robust adhesion of primer coatings to both the substrate and the ink.

Method used

The development of primer compositions comprising a rosin acid and an acid-functional ethylene copolymer, both at least partially neutralized with an amine base, along with a polyurethane as a coating enhancer, to form robust primer coatings that enhance adhesion of HP INDIGO liquid electrophotographic inks to base substrates.

Benefits of technology

The primer compositions effectively promote robust adhesion of HP INDIGO inks to base substrates, as demonstrated by improved results in tape pull tests, and ensure consistent adhesion across different ink colors, addressing the limitations of existing primer coatings.

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Abstract

Primer coatings for liquid electrophotographic printing may comprise: an aqueous fluid; about 50 wt% to about 90 wt%, based on total dissolved or dispersed solids, of a coating material comprising a rosin acid and an acid-functional ethylene copolymer having an acid number of about 110 mg KOH / g polymer or below; and about 10 wt% to about 50 wt%, based on total dissolved or dispersed solids, of a coating enhancer comprising a polyurethane. The acid-functional ethylene copolymer and the rosin acid may be at least partially neutralized with a base comprising at least one amine.
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