Initiator compositions, negative-working imageable elements, and methods of use
AssigneeEastman Kodak Company
InventorHeidi M. Munnelly
Life of this patent
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Abstract
An initiator composition and infrared radiation-sensitive composition include an onium cation and a boron-containing anion as well as a metallocene. These compositions can be used to provide negative-working imageable elements that can be imaged and developed to provide lithographic printing plates that have desired imaging speed, excellent run length, and shelf life without the need for a post-exposure baking step and oxygen barrier overcoat.
Claims23
An infrared radiation-sensitive, free radical initiator composition consisting essentially of:
- a) an infrared radiation absorbing chromophore,
- b) an onium cation,
- c) a boron-containing anion,
- d) a metallocene, and
- f) optionally, an antioxidant,
- provided that when said onium cation and said boron-containing anion are provided as part of the same salt, the boron-containing anion is an alkyltriarylborate anion.
An infrared radiation-sensitive composition comprising:
- a) an infrared radiation absorbing chromophore,
- b) an onium cation,
- c) a boron-containing anion,
- d) a metallocene,
- e) optionally, an antioxidant,
- f) a radically polymerizable component, and
- g) an alkaline developer-soluble polymeric binder,
- provided that when said onium cation and said boron-containing anion are provided as part of the same salt, the boron-containing anion is an alkyltriarylborate anion.
A negative-working, infrared radiation-sensitive imageable element comprising a substrate having thereon a single imageable layer as the outermost layer, said imageable layer comprising:
- a) an infrared radiation absorbing chromophore,
- b) an onium cation,
- c) a boron-containing anion,
- d) a metallocene,
- e) optionally, an antioxidant,
- f) a radically polymerizable component, and
- g) an alkaline developer-soluble polymeric binder,
- provided that when said onium cation and said boron-containing anion are provided as part of the same salt, the boron-containing anion is an alkyltriarylborate anion.
Dependencies are inferred from the claim text.