Encapsulated visible light absorbing dye polyurethane dispersion

摘要

The present disclosure provides an encapsulated visible light absorbing dye dispersion, and the process for producing the same. The present disclosure further provides an inkjet ink comprising an ink vehicle and an encapsulated visible light absorbing dye dispersion thereof, and the process for producing the same.

主权项

1. An encapsulated visible light absorbing dye dispersion consisting essentially of:
a polyurethane dispersion that is the reaction product of:
(a) a urethane prepolymer having an average weight molecular weight of from about 1,000 to about 20,000, the urethane prepolymer being the catalyzed reaction product of:
(i) a polyol;(ii) a polyisocyanate; and(iii) an internal surfactant;(b) a neutralizing agent; and(c) a chain extender selected from the group consisting of ethylenediamine, 1,2-propanediamine, 1,6-hexamethylenediamine, piperazine, 2,5-dimethylpiperazine, isophoronediamine, 4,4′-dicyclohexylmethanediamine, 3,3 ′-dimethyl-4,4′dicyclohexylmethanediamine, N-hydroxymethylaminoethylamine, N-hydroxyethylaminoethylamine, N-hydroxypropylaminopropylamine, N-ethylaminoethylamine, diethylenetriamine, dipropylenetriamine, and triethylenetetramine and N-methylaminopropylamine, ethylene diamine, and combinations thereof; and a visible light absorbing dye, wherein the visible light absorbing dye is not reactive towards the polyisocyanate;
wherein the encapsulated visible light absorbing dye dispersion is obtained by a process comprising:providing the urethane prepolymer;reacting the urethane prepolymer with a neutralizing agent to form a neutralized prepolymer;adding the visible light absorbing dye to the neutralized prepolymer;adding water to the neutralized prepolymer to form an aqueous dispersion of the neutralized prepolymer; andreacting the aqueous dispersion of the neutralized prepolymer with a chain extender thereby producing an encapsulated visible light absorbing dye dispersion.