Electrophotographic method for providing foil images
Foil images are formed simultaneously with color toner images on a receiver material. One or more color toner latent images are formed on the receiver material using dry color toners. Each dry color toner has a (a) polymeric resin, a (b) pigment colorant, and a (c) wax that has a melting temperature defined as T color . A foiling latent image is formed using a dry foiling toner that has a (a′) polymeric resin and a (c′) wax that has a melting temperature defined as T foiling . The foiling latent image is in an area that is different from the color image areas and T foiling is less than T color by at least 15° C. All toners are simultaneously fixed in a fuser oil-free fixing operation. A printing foil can be brought into intimate contact with the fused foiling toner at a foiling temperature (FT) that is greater than T foiling but less than T color .
1. A method for providing a foil image on a receiver material without inkjet printing, the method comprising the following A) through D):
A) providing one or more color toner latent images in one or more color image areas on a surface of a receiver material, using corresponding one or more dry color toners, each corresponding dry color toner comprising dry toner particles comprising: a (a) polymeric resin, a (b) pigment colorant, and a (c) wax that has a crystalline melting temperature defined as T color that is the temperature at the peak of a melting endotherm or the temperature at the peak of a main peak of multiple melting endotherms of the (c) wax;
B) simultaneously with or subsequently to A), providing one or more foiling toner latent images in one or more foiling image areas on the surface of the receiving material, using a dry foiling toner comprising dry foiling toner particles comprising: a (a′) polymeric resin and a (c′) wax that has a crystalline melting temperature defined as T foiling , that is the temperature at the peak of a melting endotherm or the temperature at the peak of a main peak of multiple melting endotherms of the (c′) wax,
wherein the one or more foiling image areas are different from the one or more color image areas, and T foiling is less than T color by at least 15° C., wherein all of the one or more color image areas in A) are different from all of the one or more foiling image areas;
C) simultaneously fixing the one or more color toner latent images and the one or more foiling toner latent images on the surface of the receiving material, in a fuser oil-free fusing operation, to provide one or more corresponding fused color toner images and one or more corresponding fused foiling toner images; and
D) forming one or more foil images in the one or more foiling image areas and not in the one or more color image areas, by bringing a printing foil into intimate contact with the one or more corresponding fused foiling toner images at a foiling temperature (FT) that is greater than T foiling but less than T color .
2. The method of claim 1 , wherein T color is at least 90° C. and up to and including 150° C.
3. The method of claim 1 , wherein T foiling is at least 55° C. and up to and including 90° C.
4. The method of claim 1 , wherein FT is at least 65° C. and up to and including 145° C.
5. The method of claim 1 , wherein each (a) polymeric resin of each dry color toner has a glass transition temperature (T g ) of at least 55° C. and up to and including 80° C.
6. The method of claim 1 , wherein the (a′) polymeric resin of the dry foiling toner has a glass transition temperature (T g ) of at least 45° C. and up to and including 70° C.
7. The method of claim 1 , wherein the (a′) polymeric resin has a T g that is less than the T g of each (a) polymeric resin by at least 5° C.
8. The method of claim 1 , wherein the one or more corresponding dry color toners comprise at least dry cyan, yellow, magenta, and black toners.
9. The method of claim 1 , wherein the a′) polymeric resin has a T g that is less than the T g of each (a) polymeric resin by at least 10° C.
10. The method of claim 1 , wherein the (a) polymeric resin comprises one or more resins selected from the group consisting of polyesters, styrenic-acrylic copolymers, and acrylic polymers.
11. The method of claim 1 , wherein the (c) wax is selected from the group consisting of an ester-based wax or a polyethylene wax.
12. The method of claim 1 , wherein the dry foiling toner is colorless.
13. The method of claim 1 , wherein the (a′) polymeric resin comprises one or more resins selected from the group consisting of polyesters and styrenic copolymers.
14. The method of claim 1 , wherein T foiling is less than T color by at least 30° C.
15. The method of claim 1 , wherein the printing foil comprises a composite of an organic polymer substrate having disposed thereon, in order from the organic polymer substrate, a release layer, a metallized layer, and an adhesive layer.
16. The method of claim 1 , wherein:
T foiling is less than T color by at least 30° C.;
T foiling is at least 55° C. and up to and including 70° C.;
FT is at least 65° C. and up to and including 145° C.;
each (a) polymeric resin of each dry color toner has a glass transition temperature (T g ) of at least 55° C. and up to and including 80° C.;
the (a′) polymeric resin of the dry foiling toner has a glass transition temperature (T g ) of at least 45° C. and up to and including 70° C.; and
the (a′) polymeric resin has a T g that is less than the T g of each (a) polymeric resin by at least 10° C.
17. An electrophotographic imaging method for providing an article having one or more foil images using toner latent images, the method comprising the following A′) through E′):
A′) developing one or more color toner latent images in one or more color image areas using corresponding dry color toners, to form a composite color toner image on an intermediate receiver material, each corresponding dry color toner comprising dry toner particles comprising: a (a) polymeric resin, a (b) pigment colorant, and a (c) wax that has a crystalline melting temperature defined as T color that is the temperature at the peak of a melting endotherm or the temperature at the peak of a main peak of multiple melting endotherms of the (c) wax;
B′) simultaneously with or subsequently to A), developing one or more foiling toner latent images in one or more foiling image areas to provide one or more foiling toner images on the intermediate receiver material, using a dry foiling toner comprising dry foiling toner particles comprising: a (a′) polymeric resin and a (c′) wax that has a crystalline melting temperature defined as T foiling that is the temperature t the peak of a melting endotherm or the temperature at the peak of a main peak of multiple melting endotherms of the (c′) wax,
wherein the one or more foiling image areas are different from the one or more color image areas, and T foiling is less than T color by at least 30° C. wherein all the one or more color image areas in A′) are different from all the one or more foiling image areas;
C′) transferring the composite color toner image and the one or more foiling toner images from the intermediate receiver material to a final receiver material;
D′) simultaneously fixing the transferred composite color toner image and the transferred one or more foiling toner images in a fuser oil-free fusing operation, to provide a corresponding fixed composite color toner image and one or more corresponding fixed foiling toner images; and
E′) forming one or more foil images in the one or more foiling toner images and not in the one or more color image areas, by bringing a printing foil into intimate contact with the one or more corresponding fixed foiling toner images at a foiling temperature (FT) that is greater than T foiling but less than T color , to provide an article with one or more foil images and a composite color toner image.
18. The electrophotographic imaging method of claim 17 , wherein A′) and B′) are carried out with the application of dry black toner, dry yellow toner, dry cyan toner, dry magenta toner, and dry foiling toner to the intermediate receiver material in the listed order from corresponding individual modules of an electrophotographic printing machine.