Industrial Deinking of Ink Compositions

摘要

The ink composition comprises pigment particles and a stimulus responsive dispersing agent for dispersing said pigment particles in a protic polar solvent, for instance for inkjet printing, which stimulus responsive dispersing agent comprises an anchoring part for anchoring to said pigment particles, a stimulus responsive part as shown in formula (XXa) or (XXb) and a hydrophilic part for solvent stabilization of the pigment, wherein the stimulus responsive part upon exposure to a stimulus initiates decomposition of the stimulus responsive dispersing agent. The paper with the printed ink can be deinked in an industrial deinking process.;

主权项

1. An ink composition comprising pigment particles and a stimulus responsive dispersing agent for dispersing said pigment in a protic polar solvent, which stimulus responsive dispersing agent comprises: an anchoring part for anchoring to a pigment particle,
a hydrophilic stabilization part for solvent stabilization of the pigment, and a stimulus responsive part provided with a photolabile group, which stimulus responsive part initiates upon exposure to a stimulus being UV-light, decomposition of the stimulus responsive dispersing agent into a first agent comprising the anchoring part and into a second agent comprising the hydrophilic stabilization part, wherein the photolabile group is a combination of a benzoyl-group and a polar group in the α-position to the carbonyl of the benzoyl-group, which combination corresponds to the structural formula XXa or XXb: wherein R1-R8 are substituents or hydrogen; at least one of R1-R3 in formula (XXa) contains a heteroatom chosen from O and N bonded to the carbon atom in the α-position; the stabilizing part and the anchoring parts are bonded to the shown stimulus responsive part on opposed sides of the said combination.