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US 9,540,531 B2Granted
Radiation curable ink compositions
AssigneeElectronics for Imaging, Inc.
InventorsLianhui Cong, Terrill Scott Clayton
Life of this patent
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Abstract
This invention relates to radiation curable ink compositions comprising one or more mono-functional monomers, optionally one or more oligomers, one or more antioxidants capable to react with peroxy radicals to generate radicals to propagate polymerization, and one or more photoinitiators comprising at least an acylphosphine oxide, wherein the ratio of the antioxidants to acylphpsphine is 1:1 to 1:20 by weight. The ink composition provides tack-free surface cure without requiring nitrogen or other inert gas during curing.
Claims15
A radiation curable ink composition, comprising:
- (a) 50-80% by weight of one or more mono-functional monomers,
- (b) 0-25% by weight of one or more oligomers,
- (c) 0.1-5% by weight of one or more antioxidants selected from the group consisting of phosphines and phosphites capable to react with peroxy radicals to generate active radicals to propagate polymerization, and
- (d) 1-15% by weight of one or more photoinitiators comprising at least an acylphosphine oxide or a polymeric version of acylphosphine oxide,
- wherein the ratio of the one or more antioxidants to the acylphosphine oxide is 1:1 to 1:20 by weight.
2 more elements
Dependencies are inferred from the claim text.