Surface functionalization of pigments and/or dyes for radiation curable ink printing and coating applications
Functionalized pigment compositions produced by reacting a radiation reactive organ metallic coupling agent with a pigment/dye.
1. An ink comprising a functionalized pigment composition produced by reacting a radiation reactive organometallic coupling agent with a pigment or dye.
2. The ink according to claim 1 , wherein the coupling agent is represented by the formula:
(RO) m -M-(—O—X—R′—Y) n
where, M is a metal atom selected from the group consisting of Group IIa, IIIb, IVb, Vb, VIb, VIIb, VIII, Ib, IIb, and IIIa,
R is C 1 to C 8 unsubstituted or substituted alkyl or hydrqgen,
X is an organic functional group,
R′ is an organic group which provides van der Waals' entanglement via carbon chains,
Y represents a radiation curable functional group,
m varies from 1-3 and n is 1-3.
3. The ink according to claim 1 where M is Ti, Zr or Al.
4. The ink according to claim 1 where X is alkylene, carboxyl, sulfonyl, phenolic, phosphate, pyrophosphate or phosphite.
5. The ink according to claim 1 where R′ is a C 2 to C 8 group.
6. The ink according to claim 1 where Y is an unsaturated group.
7. The ink according to claim 6 where Y is acrylate, methacrylate, epoxy or vinyl.
8. The ink according to claim 1 further comprising a resin powder.
9. The ink according to claim 1 further comprising a powdered resin, liquid monomer or oligomer.
10. The ink according to any of claims 1 to 9 which is radiation curable.
11. An ink comprising a functionalized pigment composition produced by reacting a compound of formula
with a pigment or a dye.