Varnish compositions
Provided in one example herein is a liquid electrophotographic varnish composition. The composition includes resin particles each including a polymeric resin mixture, which includes a first polymeric resin including an ethylene-based polymer; and a second polymeric resin including a polyamide. The composition also includes a carrier fluid.
1. A liquid electrophotographic varnish composition, comprising:
resin particles each comprising a polymeric resin mixture, comprising:
a first polymeric resin comprising an ethylene-based polymer; and
a second polymeric resin comprising a dimer acid based polyamide resin; and
a non-polar carrier fluid, wherein the liquid electrophotographic varnish composition is substantially colorless.
2. The liquid electrophotographic varnish composition of claim 1 , wherein the ethylene-based polymer is a copolymer of ethylene and methacrylic acid.
3. The liquid electrophotographic varnish composition of claim 1 , wherein the second polymeric resin is more polar than the first polymeric resin.
4. The liquid electrophotographic varnish composition of claim 1 , wherein the second polymeric resin comprises a thermoplastic polyamide resin.
5. The liquid electrophotographic varnish composition of claim 1 , wherein the second polymeric resin is between about 20 wt % and about 40 wt % of each of the resin particles.
6. The liquid electrophotographic varnish composition of claim 1 , wherein the first polymeric resin comprises only one ethylene-based polymer, and the polymeric resin mixture does not include any other ethylene-based polymer besides the ethylene-based polymer of the first polymeric resin.
7. The liquid electrophotographic varnish composition of claim 1 , wherein the non-polar carrier fluid comprises an isoparraffinic compound.
8. The liquid electrophotographic varnish composition of claim 1 , wherein the liquid electrophotographic varnish composition has a melt viscosity of less than or equal to about 200 CP.
9. The liquid electrophotographic varnish composition of claim 1 , wherein the liquid electrophotographic varnish composition has a melt viscosity of less than or equal to about 100 CP.
10. The liquid electrophotographic varnish composition of claim 1 , wherein the liquid electrophotographic varnish composition is substantially devoid of dye and pigment.
11. A method of manufacturing an electrophotographic varnish composition, the method comprising:
heating a thermoplastic resin mixture until the thermoplastic resin mixture is at least partially melted, the thermoplastic resin mixture comprising:
a first polymeric resin comprising an ethylene-based polymer; and
a second polymeric resin comprising a polyamide; and
cooling the thermoplastic resin mixture to form resin particles;
contacting the resin particles with a charge adjuvant to form composite particles or a mixture of particles; and
combining the composite particles or the mixture of particles with a non-polar carrier fluid to form the electrophotographic varnish composition.
12. The method of manufacturing of claim 11 , further comprising printing the varnish composition, the printing comprising:
disposing the varnish composition over a portion of a substrate, the portion containing at least a printed liquid electrophotographic ink composition.
13. An article, comprising:
a substrate; and
an image disposed over the substrate, the image comprising at least one layer of a printed liquid electrographic ink composition, and at least one layer of electrographic varnish composition printed over the printed electrographic ink composition;
wherein the electrographic varnish composition comprises:
resin particles each comprising a polymeric resin mixture, comprising:
a first polymeric resin comprising an ethylene-based polymer; and
a second polymeric resin comprising a polyamide.
14. The article of claim 13 , wherein the electrographic varnish composition further comprises a charge adjuvant.