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US 7,229,739 B2Granted
Positive working thermal plates
AssigneeAnocoil Corporation
InventorsPaul A. Perron, Brian L. Anderson, William J. Ryan
Life of this patent
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Abstract
The invention generally relates to positive-working coating compositions and to a substrate formed with a coating of that composition. Advantageous versions of the invention provide an infrared imageable, positive lithographic printing plate having a coating comprising a hydroxy substituted polymer, a diphenylcarbinol solubility suppressing compound and an infrared radiation absorbing compound.
Claims21
A positive working infrared sensitive composition prepared by combining at least the following materials:
- a hydroxy substituted polymer;
- a diphenylcarbinol solubility suppressor having the structure
- wherein R1 is selected from H, alkyl and acyclic,
- R2 and R3 are each independently selected from H, NO2, alkyl, acyclic, alkoxy, —O-acyclic, amino, alkylamino, —N(H)acyclic, dialkylamino, —N(acyclic)2, aryl, arylamino, diarylamino, a carbon ring structure, a carbocyclic ring, a heterocyclic ring and a heteroaromatic ring;
- and
- an infrared sensitive chemical having an absorption wavelength maximum in the range of about 800 nm to about 1100 nm;
- wherein the composition before exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm has a first solubility in aqueous alkaline solutions and the composition after exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm has a second solubility in aqueous alkaline solutions that is greater than the first solubility.
4 more elements
A method of making an imaged article comprising:
- preparing a positive working infrared sensitive composition by combining at least the following materials:
- a hydroxy substituted polymer;
- a diphenylcarbinol solubility suppressor having the structure
- wherein R1 is selected from H, alkyl and acyclic,
- R2 and R3 are each independently selected from H, NO2, alkyl, acyclic, alkoxy, —O-acyclic, amino, alkylamino, —N(H)acyclic, dialkylamino, —N(acyclic)2, aryl, arylamino, diarylamino, a carbon ring structure, a carbocyclic ring, a heterocyclic ring and a heteroaromatic ring;
- and
- an infrared sensitive chemical having an absorption wavelength maximum in the range of about 800 nm to about 1100 nm;
- wherein the composition before exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm has a first solubility in aqueous alkaline solutions and the composition after exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm has a second solubility in aqueous alkaline solutions that is greater than the first solubility;
- coating a substrate with the positive working infrared sensitive composition;
- exposing a portion of the coating to radiation having a wavelength in the range of about 800 nm to about 1100 nm;
- and
- contacting the exposed coating with a developer so that the exposed coating is substantially removed.
9 more elements
A positive working, infrared sensitive, imageable precursor, comprising:
- a substrate comprising a surface;
- a positive working infrared sensitive coating applied over the surface, the coating formed by combining at least the following materials:
- a hydroxy substituted polymer;
- a diphenylcarbinol solubility suppressing compound capable of hydrogen bonding with the hydroxy substituted polymer and capable of losing water when combined with the hydroxy substituted polymer and capable of regenerating water when exposed to radiation having a wavelength in the range of about 800 nm to about 1100 nm;
- and
- an infrared sensitive chemical having an absorption wavelength maximum in the range of about 800 nm to about 1100 nm;
- wherein before exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm the composition has a first solubility in aqueous alkaline solutions and after exposure to radiation having a wavelength in the range of about 800 nm to about 1100 nm the composition has a second solubility in aqueous alkaline solutions that is greater than the first solubility.
4 more elements
Dependencies are inferred from the claim text.