Get our Free Patent Expiration Newsletter

Serving hundreds of leading biopharmaceutical companies globally:

Federal Trade Commission
Fish and Richardson
Cipla
Julphar
Chubb
Accenture

Generated: August 21, 2019

DrugPatentWatch Database Preview

Claims for Patent: 5,910,391

  Try a free trial


See Plans and Pricing

« Back to Dashboard

Summary for Patent: 5,910,391
Title: Process for making lithographic printing plate with water wash containing mercapto compound
Abstract:Disclosed is a process for making a lithographic printing plate, which comprises subjecting a lithographic printing material having physical development nuclei between an aluminum support and a silver halide emulsion layer to exposure and then processing the lithographic printing material at least with a developing solution, a water washing solution and a finishing solution in this order, wherein the processing with the water washing solution is carried out by using a water washing solution containing a compound having a mercapto group or a thione group.
Inventor(s): Kondo; Toshiro (Tokyo, JP), Araki; Yutaka (Tokyo, JP), Fujioka; Hajime (Tokyo, JP), Oko; Makiko (Tokyo, JP)
Assignee: Mitsubishi Paper Mills Limited (Tokyo, JP)
Application Number:08/907,087
Patent Claims:1. A process for making a lithographic printing plate, which comprises subjecting a lithographic printing material having physical development nuclei between an aluminum support and a silver halide emulsion layer to exposure and then processing the lithographic printing material at least with a developing solution, a water washing solution and a finishing solution in this order,

wherein the processing with the water washing solution is carried out by using a water washing solution prepared by adding a nitrogen-containing heterocyclic compound having a mercapto group or a thione group to a fresh washing solution, and having a pH of 4 to 8.

2. The process according to claim 1, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is a compound represented by the formula: ##STR3## wherein R.sup.1 and R.sup.3 each independently represent an alkyl group, an alkenyl group, an acylamide group, an amino group, an aralkyl group or an aryl group; R.sup.2 represents a hydrogen atom, an alkyl group, an alkenyl group, an aralkyl group or an aryl group; m and n each represent an integer of 1 or more, and when R.sup.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group, n may be 0; and Z represents atomic groups necessary for forming a 5- or 6-membered ring together with N and C in the formula.

3. The process according to claim 2, wherein Z forms, with N and C, a 5- or 6-membered ring selected from the group consisting of imidazole, imidazoline, thiazole, thiazoline, oxazole, oxazoline, pyrazoline, triazole, thiadiazole, oxadiazole, tetrazole, pyridine, pyrimidine, pyridazine, pyrazine and triazine rings, which may be produced by condensing two or more rings or fused with a benzene ring or a naphthalene ring.

4. The process according to claim 1, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is a compound selected from the group consisting of 2-mercapto-4-phenylimidazole, 2-mercapto-1-benzylimidazole, 2-mercapto-1-butyl-benzimidazole, 1,3-dibenzyl-imidazolidine-2-thione, 2-mercapto-4-phenylthiazole, 3-butyl-benzothiazoline-2-thione, 3-dodecyl-benzothiazoline-2-thione, 2-mercapto-4,5-diphenyloxazole, 3-pentyl-benzoxazoline-2-thione, 1-phenyl-3-methylpyrazoline-5-thione, 3-mercapto-4-allyl-5-pentadecyl-1,2,4-triazole, 3-mercapto-5-nonyl-1,2,4-triazole, 3-mercapto-4-acetamide-5-heptyl-1,2,4-triazole, 3-mercapto-4-amino-5-heptadecyl-1,2,4-triazole, 2-mercapto-5-phenyl-1,3,4-thiadiazole, 2-mercapto-5-n-heptyl-oxathiazole, 2-mercapto-5-n-heptyl-oxadiazole, 2-mercapto-5-phenyl-1,3,4-oxadiazole, 5-mercapto-1-phenyl-tetrazole, 3-mercapto-4-methyl-6-phenyl-pyridazine, 2-mercapto-5,6-diphenyl-pyrazine, 2-mercapto-4,6-diphenyl-1,3,5-triazine and 2-amino-4-mercapto-6-benzyl-1,3,5-triazine.

5. The process according to claim 1, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is contained in the water washing solution in an amount of 0.01 to 10 g/liter.

6. The process according to claim 1, wherein the water washing solution further contains a buffer which buffers pH in the range of 4 to 8.

7. The process according to claim 6, wherein the buffer is a phosphate buffer, a citrate buffer or a mixture thereof.

8. The process according to claim 1, wherein at least one of the developing solution and the finishing solution contains a nitrogen-containing heterocyclic compound having a mercapto group or a thione group.

9. The process according to claim 8, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is a compound represented by the formula: ##STR4## wherein R.sup.1 and R.sup.3 each independently represent an alkyl group, an alkenyl group, an acylamide group, an amino group, an aralkyl group or an aryl group; R.sup.2 represents a hydrogen atom, an alkyl group, an alkenyl group, an aralkyl group or an aryl group; m and n each represent an integer of 1 or more, and when R.sup.2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group, n may be 0; and Z represents atomic groups necessary for forming a 5- or 6-membered ring together with N and C in the formula.

10. The process according to claim 9, wherein Z forms, with N and C, a 5- or 6-membered ring selected from the group consisting of imidazole, imidazoline, thiazole, thiazoline, oxazole, oxazoline, pyrazoline, triazole, thiadiazole, oxadiazole, tetrazole, pyridine, pyrimidine, pyridazine, pyrazine and triazine rings, which may be produced by condensing two or more rings or fused with a benzene ring or a naphthalene ring.

11. The process according to claim 8, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is a compound selected from the group consisting of 2-mercapto-4-phenylimidazole, 2-mercapto-1-benzylimidazole, 2-mercapto-1-butyl-benzimidazole, 1,3-dibenzyl-imidazolidine-2-thione, 2-mercapto-4-phenylthiazole, 3-butyl-benzothiazoline-2-thione, 3-dodecyl-benzothiazoline-2-thione, 2-mercapto-4,5-diphenyloxazole, 3-pentyl-benzoxazoline-2-thione, 1-phenyl-3-methylpyrazoline-5-thione, 3-mercapto-4-allyl-5-pentadecyl-1,2,4-triazole, 3-mercapto-5-nonyl-1,2,4-triazole, 3-mercapto-4-acetamide-5-heptyl-1,2,4-triazole, 3-mercapto-4-amino-5-heptadecyl-1,2,4-triazole, 2-mercapto-5-phenyl-1,3,4-thiadiazole, 2-mercapto-5-n-heptyl-oxathiazole, 2-mercapto-5-n-heptyl-oxadiazole, 2-mercapto-5-phenyl-1,3,4-oxadiazole, 5-mercapto-1-phenyl-tetrazole, 3-mercapto-4-methyl-6-phenyl-pyridazine, 2-mercapto-5,6-diphenyl-pyrazine, 2-mercapto-4,6-diphenyl-1,3,5-triazine and 2-amino-4-mercapto-6-benzyl-1,3,5-triazine.

12. The process according to claim 8, wherein the nitrogen-containing heterocyclic compound having a mercapto group or a thione group is contained in the developing or finishing solution in an amount of 0.01 to 10 g/liter.

13. The process according to claim 1, wherein at least one of the water washing solution and the finishing solution contains a proteinase.

14. The process according to claim 13, wherein the proteinase is at least one selected from the group consisting of pepsin, rennin, trypsin, chymotrypsin, cathepsin, papain, ficin, thrombin, renin, collagenase, bromelain and bacterioproteinase.

15. The process according to claim 14, wherein the proteinase is trypsin, papain, ficin or bacterioproteinase.

16. The process according to claim 13, wherein at least one of the water washing solution and the finishing solution contains a proteinase in an amount of 0.1 to 20 g/liter.

17. The process according to claim 1, wherein said compound having a mercapto group or a thione group is water-insoluble and said process further includes the step of employing a dissolving aid to dissolve said compound having a mercapto group or a thione group in the washing solution.

18. The process according to claim 1, wherein the washing solution contains the compound having a mercapto group or a thione group in an amount of 0.2 to 4 g/liter.

19. A process for making a lithographic printing plate, which comprises subjecting a lithographic printing material having physical development nuclei between an aluminum support and a silver halide emulsion layer to exposure,

preparing a fresh washing solution by adding a nitrogen-containing heterocyclic compound having a mercapto group or a thione group, said fresh water washing solution having a pH of 4 to 8, and

processing the lithographic printing material at least with a developing solution, said water washing solution and a finishing solution in this order.

Summary for Patent:   Try a Free Trial

Foriegn Application Priority Data
Foreign Country Foreign Patent Number Foreign Patent Date
Japan8-208307Aug 07, 1996
Japan8-235305Sep 05, 1996

Details for Patent 5,910,391

Applicant Tradename Biologic Ingredient Dosage Form BLA Number Approval Date Patent No. Assignee Estimated Patent Expiration Status Orphan Source
Advance Biofactures SANTYL collagenase VIAL 101995 001 1965-06-04   Try a Free Trial Mitsubishi Paper Mills Limited (Tokyo, JP) 2016-08-07 RX search
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Number >Approval Date >Patent No. >Assignee >Estimated Patent Expiration >Status >Orphan >Source

Subscribe to access the full database, or try a Free Trial

Make Better Decisions: Try a trial or see plans & pricing

Serving hundreds of leading biopharmaceutical companies globally:

Cantor Fitzgerald
McKinsey
Deloitte
Chubb
Healthtrust
Federal Trade Commission

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verifification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.