Use of fluorescing toners for imaging
View Patent ↗A fluorescing dry toner particle comprises a polymeric binder phase comprising a non-fluorescing binder polymer and a polymeric fluorescing colorant dispersed within the non-fluorescing binder polymer. The polymeric fluorescing colorant comprises a fluorescing moiety that is covalently attached to a colorant polymer that is the same or different than the non-fluorescing binder polymer, but the polymeric fluorescing colorant is blendable with the non-fluorescing binder polymer to form a homogeneous polymeric binder matrix, and is present in an amount of at least 1 weight % and up to and including 40 weight %, based on the total fluorescing dry toner particle weight. These fluorescing dry toner particles can be used in various dry developers to provide fluorescing toner images with or without non-fluorescing color toner images.
1. A method for providing a toner image, the method comprising:
forming a latent image,
developing the latent image using one or more of non-fluorescing cyan, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black dry toner particles, in any sequence, to provide developed non-fluorescing cyan, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black toner images, and further using colored magenta, cyan, or yellow fluorescing dry toner particles to form a developed colored fluorescing toner image,
transferring the developed colored fluorescing toner image comprising the colored magenta, cyan, or yellow fluorescing dry toner particles to a receiver material to form a transferred colored fluorescing toner image, and
fixing the transferred colored fluorescing toner image to the receiver material,
wherein each colored magenta, cyan, or yellow fluorescing dry toner particle comprises a polymeric binder phase consisting essentially of a non-fluorescing binder polymer, and a polymeric magenta, cyan, or yellow fluorescing colorant dispersed within the non-fluorescing binder polymer,
wherein:
(a) the polymeric magenta, cyan, or yellow fluorescing colorant comprises a fluorescing moiety that is covalently attached to a colorant polymer that is the same or different than the non-fluorescing binder polymer, but which polymeric magenta, cyan, or yellow fluorescing colorant is blendable with the non-fluorescing binder polymer to form a homogeneous colored polymeric binder matrix, and
(b) the polymeric magenta, cyan, or yellow fluorescing colorant is present in an amount of at least 1 weight % and up to and including 40 weight %, based on the total colored magenta, cyan, or yellow fluorescing dry toner particle weight,
wherein the colored magenta, cyan, or yellow fluorescing dry toner particles are applied over or under one or more of the non-fluorescing cyan, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black toner images to provide a colored magenta, cyan, or yellow fluorescing effect in the one or more non-fluorescing cyan, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black toner images.
2. The method of claim 1 , wherein the colored magenta, cyan, or yellow fluorescing dry toner particle has a mean volume weight diameter (D vol ) before fixing of at least 4 μm and up to and including 20 μm.
3. The method of claim 1 , comprising:
forming the latent image as an electrostatic latent image on a primary imaging member,
electrostatically transferring the developed colored fluorescing toner image from the primary imaging member to the receiver material to form the transferred colored fluorescing toner image, and
fixing the transferred colored fluorescing toner image to the receiver material at a temperature of at least 135° C.
4. The method of claim 1 , further comprising developing the latent image using each of the non-fluorescing cyan, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black dry toner particles, in any sequence, to provide developed non-fluorescing, non-fluorescing yellow, non-fluorescing magenta, and non-fluorescing black toner images.