Aqueous dye preparation for paper contains dye-containing polymer based on hydrophobic monomers and amphiphilic copolymer based on hydrophobic monomers, monomers with basic or quaternary nitrogen and other monomers

摘要

Aqueous dye preparation, contains dye-containing polymer based on hydrophobic monomers and amphiphilic copolymer based on hydrophobic monomers, monomers with basic or quaternary nitrogen and other monomers. Aqueous dye preparations containing: (i) dye-containing polymer(s) (PF) in the form of dispersed particles based on monomers (M1) comprising at least 50 wt% mono-unsaturated, hydrophobic monomer(s) (A) with a water solubility of 0.01-60 g/l and containing oil-soluble dye(s) in molecular dispersion; and (ii) amphiphilic copolymer(s) (CP) based on: (a) hydrophobic monomer(s); (b) monomer(s) with basic nitrogen atoms (b1) and/or monomers with quaternary N atoms (b2); and (c) other comonomer(s). Independent claims are also included for: (1) dye-containing polymer powders obtained by drying these preparations; (2) a method for dyeing paper by adding dye-containing polymer (PF) and a statistical copolymer (CP), or an aqueous preparation or dried polymer powder as described above, to paper pulp and then removing water.