Thermal imaging composition and member and methods of imaging and printing
AssigneeEastman Kodak Company
InventorsShiying Zheng, Grace A. Bennett
Life of this patent
Estimating the term…
Abstract
An imaging member, such as a negative-working printing plate or on-press cylinder, has an imaging layer comprised of a thermally sensitive compound and a photothermal conversion material. The thermally sensitive compound comprises a heat-activatable bisulfite adduct and can be a polymer or a small molecule compound. In the imaging member, the thermally sensitive compound reacts to provide increased hydrophobicity in areas exposed to energy that provides or generates heat. The imaging layer is considered “switchable” and can be used to provide a lithographic printing image without traditional alkaline wet processing.
Claims17
A heat-sensitive composition comprising:
- a) a thermally sensitive compound comprising a heat-activatable bisulfite adduct, and
- b) a photothermal conversion material,
- wherein said thermally sensitive compound is represented by the following Structure I:
- wherein R1 is a polymeric group R2 is an aliphatic or aromatic group, M is hydrogen or a cation of valency n, n is 1, 2, 3 or 4, p is 1, and R3 is hydroxy or thio.
A thermally sensitive, negative-working imaging member comprising a support having disposed thereon, a single heat-sensitive imaging layer comprising:
- a) a thermally sensitive compound comprising a heat-activatable bisulfite adduct, and
- b) a photothermal conversion material, wherein said thermally sensitive compound is represented by the following Structure I:
- wherein R1 is an aliphatic, aromatic, or polymeric backbone, R2 is —NHR4, M is a hydrogen or a cation of valency n, n is 1, 2, 3, or 4, p is 0 or 1, provided that when p is 0, R3 is oxo or thioxo, and when p is 1, R3 is hydroxy or thio, and R4 is an aliphatic, aromatic, or polymeric group.
A negative-working lithographic printing plate comprising an aluminum or polyester support having disposed thereon a single imaging layer comprising:
- a) one or more of the following compounds as thermally sensitive compounds represented by Structure I:
- wherein R1 is an aliphatic, aromatic, or polymeric backbone, R2 is —NHR4, M is a hydrogen or a cation of valency n, n is 1, 2, 3, or 4, p is 0 or 1, provided that when p is 0, R3 is oxo or thioxo, and when p is 1, R3 is hydroxy or thio, and R4 is an aliphatic, aromatic, or polymeric group,
- b) a photothermal conversion material that is a carbon black or an IR dye,
- said one or more thermally sensitive compounds being present in an amount of from about 0.1 to about 10 g/m2 and said photothermal conversion material present in an amount of from about 0.002 to about 5 g/m2.
A thermally sensitive, negative-working imaging member comprising a support having disposed thereon, a single heat-sensitive imaging layer comprising:
- a) a thermally sensitive compound comprising a heat-activatable bisulfite adduct, and
- b) a photothermal conversion material wherein said thermally sensitive compound is represented by the following Structure I:
- wherein R1 is a polymeric backbone, R2 is an aliphatic or aromatic group, M is a hydrogen or a cation of valency n, n is 1, 2, 3 or 4, p is 1, and R3 is hydroxy or thio.
Dependencies are inferred from the claim text.