Sun Chemical Corporation

Terry Best

Juanita M Parris

Richard R Durand, Jr

John Gerard Tiessen

Aldo Bruccoleri

Xiang Jun Liu

Described herein are inks and coating compositions comprising semiconductor metal oxides and composites thereof, which are natural environmentally sustainable materials that may be recycled and/or reused indefinitely. Semiconductor metal oxides offer an alternative to relatively more toxic, non-sustainable, photo and heat-degrading, migrating traditional photoinitiator agents used in actinic radiation curable compositions. The semiconductor metal oxides and composites thereof absorb visible or UV-light as photocatalysts and/or semiconductors, or absorb electron beam radiation, forming radicals for radical events as polymerization reactions and color enhancement events.

Actinic radiation curable compositions including semiconductor metal oxide materials

Methods and apparatus for flexographic color printing, and more particularly for implementing 'wet trapping' in flexographic printing using energy curable flexographic liquid inks are presented. Radiation curable inks can be formulated that wet trap over each other without back-trapping onto the plates and anilox units of down-line printing units by controlling the storage modulus of the inklcoating. The storage modulus G' in the inks can be controlled to ensure that the highest G&#x2032; ink is printed ISt down with successive colors being trapped in the order of their (declining) G&#x2032; values. An image in wet ink can thus be trapped over a different image in wet ink of a different color without picking the ISt ink back up and redepositing it onto the subsequent plates and rollers in the printing press (back-trapping).

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Newark, NJ, United States of America

Terry Best