Imageable elements with improved abrasion resistance
AssigneeEastman Kodak Company
InventorsGerhard Hauck, Celin Savariar-Hauck
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Abstract
Single- and multi-layer positive-working imageable elements include an ink receptive outer layer that includes inorganic, non-metallic, inert discrete particles, such as nano-sized silica, aluminum oxide, or titanium dioxide particles. The presence of these particles in the outermost layer improves the abrasion and scratch resistance of the elements.
Claims14
A multi-layer positive-working imageable element that is a positive-working lithographic printing plate precursor comprising a hydrophilic aluminum-containing substrate having thereon, an inner imageable layer comprising a first polymeric binder disposed on the substrate and an outer imageable layer comprising a second polymeric binder disposed over the inner imageable layer,
- wherein:
- the second polymeric binder is different from the first polymeric binder,
- the outer imageable layer comprises inorganic, non-metallic, inert discrete particles dispersed within the second polymeric binder that is insoluble in alkaline developer before thermal imaging and soluble in said alkaline developer after thermal imaging,
- said element further comprises a radiation absorbing compound only in the inner imageable layer, and
- said discrete particles have an average particle size of from 10 nm to 300 nm, and are present in said outer imageable layer in an amount of from about 5 to about 30% based on total outer imageable layer dry weight wherein said discrete particles are composed of silica, aluminum oxide, or titanium dioxide.
A plurality of multi-layer positive-working imageable elements arranged in a stack with interleaving paper between each individual multi-layer positive-working imageable element,
- each multi-layer positive-working imageable element comprising a substrate having thereon, an inner imageable layer comprising a first polymeric binder disposed on the substrate and an outer imageable layer comprising a second polymeric binder disposed over the inner imageable layer,
- wherein:
- the second polymeric binder is different from the first polymeric binder,
- only the outer imageable layer comprises inorganic, non-metallic, inert discrete particles dispersed within the second polymeric binder that is insoluble in alkaline developer before thermal imaging and soluble in is the alkaline developer after thermal imaging,
- the element further comprises a radiation absorbing compound only in the inner imageable layer, and
- the discrete particles have an average particle size of from 10 nm to 300 nm, and are present in the outer imageable layer in an amount of from about 5 to about 30% based on total outer imageable layer dry weight.
Dependencies are inferred from the claim text.