Compositions and use of compositions in printing processes
View Patent ↗An aqueous sacrificial coating composition for an image transfer member in an aqueous ink imaging system is provided. The sacrificial coating composition may include at least one polymer, at least one selected from (i) at least one chain extender, or (ii) a reactive elastomeric latex, wherein the at least one chain extender comprises a species capable of linking linear chains or chain segments of the reactive elastomeric latex, at least one hygroscopic plasticizer, and at least one surfactant.
1. An aqueous ink composition, comprising:
a latex emulsion;
a reactive elastomeric latex capable of reacting with a chain extender;
at least one colorant; and
at least one solvent comprising water,
wherein the latex emulsion comprises of a polystyrene copolymer, and
wherein the reactive elastomeric latex comprises of a polyurethane elastomer.
2. The aqueous ink composition of claim 1 , wherein the polystyrene copolymer is formed by emulsion polymerization of styrene, n-butyl acrylate, methacrylic acid, beta-carboxyethylacrylate (beta-CEA) and a surfactant.
3. The aqueous ink composition of claim 1 , wherein the polystyrene copolymer is comprised of styrene monomer and butyl acrylate monomer.
4. The aqueous ink composition of claim 1 , wherein the reactive elastomeric latex comprises a water-based aliphatic polyurethane elastomer.
5. The aqueous ink composition of claim 1 , wherein the reactive elastomeric latex comprises about 0.01 wt % to about 10 wt % of the aqueous ink composition.
6. The aqueous ink composition of claim 1 , further comprising a viscosity of about 3 to about 12 cps at a temperature suitable for ejecting as droplets from an inkjet printhead.
7. The aqueous ink composition of claim 1 , wherein the polystyrene copolymer has a glass transition temperature of less than 63° C.