TONER COMPOSITION FOR PREVENTING IMAGE BLOCKING
First Claim
1. A protective toner for digital printing wherein a protective overcoat can be printed by electrographic techniques, comprising a toner binder having a glass transition temperature of at least 60°
- C. and ethylene-bis-stearamide in an amount between 0.5 and 5 percent by weight of the toner.
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0 Petitions
Accused Products
Abstract
Images produced by electrophotography are often subjected to harsh conditions, such as high temperature and high relative humidity conditions. Prints when subjected to face-to-face stacking under these conditions tend to stick and are difficult to separate without damage. Ethylene-bis-stearamide is incorporated in a protective toner formulation employing a toner binder having a higher glass transition temperature than that of the conventional CYMK colored image toners employed to provide a protective layer in fused images. Further, ethylene-bis-stearamide does not interfere with typical oil release additives used in fuser rollers. By combining ethylene-bis-stearamide with polyalkane waxes having a weight average molecular weight of equal to or greater than 2000 and a poly dispersity of less than 2.0, addition protection can be realized.
20 Citations
20 Claims
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1. A protective toner for digital printing wherein a protective overcoat can be printed by electrographic techniques, comprising a toner binder having a glass transition temperature of at least 60°
- C. and ethylene-bis-stearamide in an amount between 0.5 and 5 percent by weight of the toner.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13)
- 11. A electrographic print comprising an image formed from marking toner and a protective toner overcoat deposited on a receiver member, said marking toner comprising a toner binder having a first glass transition temperature, and said protective toner overcoat comprising a toner binder having a second glass transition temperature greater than the glass transition temperature of the binder of the marking toner and ethylene-bis-stearamide in an amount between 0.5 and 5 percent by weight of the protective toner.
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17. A process for electrographic printing of an image with a protective toner overcoat, said electrographic printing comprising the steps of electrographically forming a desired print image on a receiver member utilizing marking toner comprising a toner binder having a glass transition temperature of less than 60°
- C., and electrographically forming a protective overcoat on the print image utilizing a protective toner comprising a toner binder having a glass transition temperature of at least 60°
C. and ethylene-bis-stearamide in an amount between 0.5 and 5 percent by weight of the protective toner; and
fixing the toner in the area of the formed print image where protection against blocking is desired. - View Dependent Claims (18, 19, 20)
- C., and electrographically forming a protective overcoat on the print image utilizing a protective toner comprising a toner binder having a glass transition temperature of at least 60°
Specification