Claims
- 1. A substantially light-insensitive black and white mono sheet thermographic recording material comprising a support and a thermosensitive element provided with a protective layer, said thermosensitive element containing a substantially light-insensitive organic silver salt, a 1,2-dihydroxy-benzene derivative in thermal working relationship therewith and a polymer having active hydrogen atoms at least part of which has reacted with a polyisocyanate selected from the group consisting of: hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, naphthylene diisocyanate and triphenylmethane-p, p′, p″-trityl triisocyanate; wherein said protective layer being exclusive of fluorine-containing compounds and wherein said thermosensitive element being exclusive of propenenitrile compounds.
- 2. Thermographic recording material according to any of claim 1, wherein said 1,2-dihydroxybenzene derivative is a compound represented by formula (I): where n is 0 or 1; R is —(C═O)R1, —(C═O)NR1R2, —CN, —SO3R1, —SO2R1, —SOR1, —SO2NR1R2 or —PO3R1R2; R1 is H or an alkyl, an aryl group; and R2 is H or an alkyl or an aryl group; and R1 and R2 together can represent the atoms to close a ring.
- 3. Thermographic recording material according to claim 1, wherein said 1,2-dihydroxybenzene derivative is selected from the group consisting of: ethyl 3,4-dihydroxybenzoate, butyl 3,4-dihydroxybenzoate, 3,4-dihydroxybenzonitrile, 2,3,4-trihydroxy-acetophenone, 2,3,4-trihydroxy-propionophenone, 2,3,4-trihydroxybenzaldehyde, 2,3,4-trihydroxy-butyrophenone and 2,3,4-trihydroxybenzonitrile.
- 4. Thermographic recording material according to claim 1, wherein said polymer having active hydrogen atoms is selected from the group consisting of polyvinyl alcohol, polyvinyl acetals and proteinaceous binders.
- 5. Thermographic recording material according to claim 1, wherein said substantially light-insensitive organic silver salt is a silver salt of an aliphatic carboxylic acid having at least 12 carbon atoms.
- 6. Thermographic recording material according to claim 1, wherein protective layer contains a second polymer having active hydrogen atoms and a second polyisocyanate.
- 7. A recording process comprising the steps of: (i) bringing an outermost layer of a substantially light-insensitive black and white monosheet thermographic recording material into proximity with a heat source, said thermographic recording material comprising a support and a thermosensitive element provided with a protective layer, said thermosensitive element containing a substantially light-insensitive organic silver salt, a 1,2-dihydroxy-benzene derivative in thermal working relationship therewith and a polymer having active hydrogen atoms at least part of which has reacted with a first polyisocyanate selected from the group consisting of: hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, naphthylene diisocyanate and triphenylmethane-p,p′,p″-trityl triisocyanate, wherein said protective layer being exclusive of fluorine-containing compounds and wherein said thermosensitive element being exclusive of propenenitrile compounds; and (ii) applying heat from said heat source imagewise to said thermographic recording material while maintaining proximity to said heat source to produce an image; and (iii) removing said thermographic recording material from said heat source.
- 8. Recording process according to claim 7, wherein said heat source is a thin film thermal head.
Priority Claims (1)
Number |
Date |
Country |
Kind |
98204016 |
Nov 1998 |
EP |
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Parent Case Info
This application claims the benefit of U.S. Provisional Appln. No. 60/118,483 filed Feb. 3, 1999.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5468603 |
Kub |
Nov 1995 |
|
5686228 |
Murray et al. |
Nov 1997 |
|
5710095 |
Horsten et al. |
Jan 1998 |
|
Provisional Applications (1)
|
Number |
Date |
Country |
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60/118483 |
Feb 1999 |
US |