Claims
- 1. A substnatially non-photosensitive thermosensitive recording material suited for use in direct thermal imaging by means of an information-wise energized heating element comprising on the same side of a support, one or more layers containing in thermal working relationship one or more substances yielding an optical density change by heat, and a protective transparent resin layer essentially consisting of a polycarbonate or copolycarbonate derived from one or more bisphenols, wherein at least 25 mole % of said bisphenols consists of a bis-(hydroxyphenyl)-cycloalkane corresponding to following formula (I): ##STR9## wherein each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 (same or different) represents hydrogen, halogen, a C1-C8 alkyl group, a substituted C1-C8 alkyl group, a C5-C6 cycloalkyl group, a substituted C5-C6 cycloalkyl group, a C6-C10 aryl group, a substituted C6-C10 aryl group, a C7-C12 aralkyl group, or a substituted C7-C12 aralkyl group, and
- X represents a plurality of atoms necessary to complete a 5- to 8-membered alicyclic ring, which either is attached to at least one C1-C6 alkyl group or at least one 5- or 6-membered cycloalkyl group.
- 2. The thermosensitive recording material according to claim 1, wherein in said general formula (I) one or two carbon atoms of said alicyclic ring carry a C1-C6 alkyl group.
- 3. The substantially non-photosensitive thermosensitive recording material according to claim 1, wherein said alicyclic ring is substituted with two C1-C6 alkyl groups at ring carbon atom(s) which are two carbon atoms removed from a carbon atom at which said hydroxyphenyl-groups are attached to said alicyclic group.
- 4. The thermosensitive recording material according to claim 1, wherein a bis-(hydroxyphenyl)-cycloalkane according to said formula (I) corresponds to one of following formulae (II) to (IV): ##STR10##
- 5. The substantially non-photosensitive thermosensitive recording material according to claim 1, wherein a copolycarbonate is derived from a bisphenol according to said formula (I) and a bisphenol corresponding to the following general formula:
- HO--Z--OH (VII)
- wherein Z stands for a bivalent organic group comprising one or more aromatic nuclei in which the two OH-- groups of said general formula (VII) are either both attached to a single aromatic nucleus, or the OH-groups are linked to two different aromatic nuclei, in the latter case said two different aromatic nuclei must be linked directly or through a bivalent radical selected from the group consisting of --O--, --S--, carbonyl, sulfinyl, sulfonyl or a bivalent straight chain or branched chain aliphatic group or bivalent unsubstituted cycloaliphatic group.
- 6. The substantially non-photosensitive thermosensitive recording material according to claim 5, wherein said bisphenol according to formula (VII) is 2,2-bis-(4-hydroxyphenyl)-propane.
- 7. The substantially non-photosensitive thermosensitive recording material according to claim 5, wherein the copolycarbonate further comprises a branching agent having three or more phenolic groups.
- 8. The substantially non-photosensitive thermosensitive recording material according to claim 1, wherein said protective transparent layer contains a liquid lubricant.
- 9. The substantially non-photosensitive thermosensitive recording material according to claim 1, wherein said one or more layers contains a substantially light-insensitive organic silver salt in admixture with a reducing agent therefor.
- 10. The substantially non-photosensitive thermosensitive recording material according to claim 9, wherein said silver salt is a silver salt of an aliphatic carboxylic acid the aliphatic carbon chain of which contains at least 12 C-atoms.
- 11. The thermosensitive recording material according to claim 1, wherein a substantially light-insensitive organic silver salt and another layer contains in thermal working relationship with said silver salt one or more reducing agents therefor.
- 12. A process for direct thermal imaging on a substantially non-photosensitive thermosensitive recording material comprising the steps of:
- (i) contacting an information-wise energized heating element with said substantially non-photosensitive thermosensitive recording material, comprising on the same side of a support one or more layers containing in thermal working relationship one or more substances yielding an optical density change by heat; and
- a protective transparent resin layer consisting essentially of a polycarbonate or copolycarbonate derived from one or more bisphenols, wherein at least 25 mole % of said bisphenols consists of a bis-(hydroxyphenyl)-cycloalkane corresponding to following formula (I): ##STR11## wherein each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 (same or different) represents hydrogen, halogen, a C1-C8 alkyl group, a substituted C1-C8 alkyl group, a C5-C6 cycloalkyl group, a substituted C5-C6 cycloalkyl group, a C6-C10 aryl group, a substituted C6-C10 aryl group, or a C7-C12 aralkyl group and
- X represents a plurality of atoms as necessary to complete a 5- to 8-membered alicyclic ring, which either is attached to at least one C1-C6 alkyl group or at least one 5- or 6-membered cycloalkyl group; and
- (ii) heating said substantially non-photosensitive thermosensitive recording information-wise with said heating element.
- 13. The process for direct thermal imaging according to claim 12, wherein said alicyclic ring is substituted with two C1-C6 alkyl groups at ring carbon atom(s) two carbon atoms removed from a carbon atom at which said hydroxvghenyl-groups are attached to said alicyclic group.
- 14. The process for direct thermal imaging according to claim 12, wherein one or more layers contains a substantially light-insensitive organic silver salt in admixture with a reducing agent therefor.
- 15. The process for direct thermal imaging according to claim 12, wherein said one or more layers contains a substantially light-insensitive organic silver salt and another layer contains in thermal working relationship with said silver salt one or more reducing agents therefore.
- 16. The process for direct thermal imaging according to claim 12, wherein said protective transparent layer optionally contains a liquid lubricant.
Priority Claims (1)
Number |
Date |
Country |
Kind |
93200653 |
Mar 1993 |
EPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/328,542, filed on Oct. 25, 1994, now abandoned, which is a file-wrapper continuation of application Ser. No. 08/206,438, filed on Mar. 4, 1994, now abandoned.
US Referenced Citations (3)
Non-Patent Literature Citations (2)
Entry |
Research Disclosure 10148, 1972. |
Disclosed Anonymously (R1278), Research Disclosure 10147, Sep. 1972. |
Continuations (2)
|
Number |
Date |
Country |
Parent |
328542 |
Oct 1994 |
|
Parent |
206438 |
Mar 1994 |
|