Patent ID: 11884829
Assignee: AGFA NV
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  B  D | IPC B  C  D

Claim 14:
15. A method for preparing an aqueous dispersion of a capsule as defined in claim 1, including the steps of:
a) preparing a non-aqueous solution of i) a compound selected from the group consisting of di- or poly-acid chlorides, di- or oligoisocyanates, di- or oligosulfochlorides, di- or oligo-chloroformates, an isocyanate monomer, and mixtures thereof and ii) one or more chemical reactants capable of forming a reaction product upon application of heat and/or radiation in a water immiscible solvent having a boiling point below 100° C. at normal pressure;
b) preparing an aqueous solution of a surfactant comprising a quaternary ammonium group and at least one primary or secondary amine to covalently bond the surfactant to a polymeric shell;
c) dispersing the non-aqueous solution under high shear in the aqueous solution;
d) adding a polyamine compound having at least three nucleophilic groups to the dispersion; and
e) optionally stripping the organic solvent from the dispersion.