Diazo light-sensitive copying composition and process of using in the manufacture of screen printing stencils

• US 4,021,243 A
• Filed: 01/22/1976
• Issued: 05/03/1977
• Est. Priority Date: 08/20/1970
• Status: Expired due to Term

• Current Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Ruckert, Hans, Steppan, Hartmut
• Primary Examiner(s): Bowers, Jr., Charles L.
• Application Number:
  US05/651,317
• Time in Patent Office: 467 Days
• Field of Search: 96/36.4, 96/75, 96/91 R
• US Class Current: 430/6
• CPC Class Codes: C08G 73/00 Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00 polycarbodiimides prepared from isocyanates C08G18/025, C08G18/797
• CPC Class Codes: G03F 7/021 Macromolecular diazonium compounds; Macromolecular additives, e.g. binders G03F7/0166 takes precedence
• CPC Class Codes: G03F 7/12 Production of screen printing forms or similar printing forms, e.g. stencils

Abstract

This invention relates to a light-sensitive copying composition for the preparation of screen printing stencils comprising a condensation product of an aromatic diazonium compound in admixture with a hydrophilic hardenable binder, the condensation product containing at least one unit each of the general types A(-D)_n and B which are connected by bivalent intermediate members derived from a condensable carbonyl compound, wherein

A is a radical of a compound containing at least two isocyclic or heterocyclic aromatic nuclei, which compound is capable of condensation in at least one position with an active carbonyl compound in an acid medium,

D is a diazonium salt group attached to an aromatic carbon atom of A,

n is an integer from 1 to 10, and

B is a radical of a compound free of diazonium groups, which compound is capable of condensation in at least one position with an active carbonyl compound in an acid medium,

And wherein the anion of the diazonium salt is derived from an aliphatic monosulfonic acid having 1 to 6 carbon atoms.

Claims

1. A process for the preparation of screen printing stencils, which comprises coating a screen printing support with a liquid light-sensitive composition comprising a hydrophilic hardenable binder in admixture with a condensation product comprising repeating units of each of the general types

View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)

2. A process according to claim 1 in which the condensation product used is in the form of the salt of an aliphatic monosulfonic acid having 1 to 4 carbon atoms.

3. A process according to claim 2 in which the condensation product is in the form of a methane sulfonate.

4. A process according to claim 1 in which the condensation product is a condensate of a 3-alkoxy-diphenylamine-4-diazonium salt and a diphenylether, diphenylsulfide, diphenylmethane or diphenyl compound.

5. A process according to claim 1 in which the condensation product contains the units A--N₂ X and B in a molar ratio between 1:

0.5 and 1;

2.

6. A process according to claim 1 in which the coating composition contains the condensation product in a proportion of 2 to 20% by weight of the solids content.

7. A process according to claim 1 in which the coating composition is in the form of an aqueous solution.

8. A process according to claim 7 in which the solution contains, in addition, a dispersed filler.

9. A process according to claim 8 in which the dispersed filler is a water-insoluble organic polymer.

10. A process according to claim 9 in which the water-insoluble organic polymer is a vinyl acetate polymer.

11. A process according to claim 1 in which the hydrophilic binder is polyvinyl alcohol.

12. A process according to claim 1 in which the condensation product is a condensate of 4,4'"'"'-bis-methoxymethyl-diphenylether and 3-methoxydiphenylamine-4-diazonium sulfate.

13. A process according to claim 1 in which the condensation product is a condensate of 1,3-bis-hydroxy-methyl-4,6-diisopropylbenzene and 3-methoxy-diphenylamine-4-diazonium sulfate.

14. A process according to claim 1 in which the condensation product is a condensate of 4,4'"'"'-bis-methoxy-methyl diphenyl ether and 2,5,4'"'"'-triethoxydiphenyl-4-diazonium sulfate.

15. A light-sensitive reproduction material including a screen printing support carrying a light-sensitive layer comprising a hydrophilic hardenable binder in admixture with a light-sensitive condensation product comprising repeating units of each of the general types

View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)

16. A light-sensitive reproduction material according to claim 15 in which the condensation product is in the form of the salt of an aliphatic monosulfonic acid having 1 to 4 carbon atoms.

17. A light-sensitive reproduction material according to claim 16 in which the condensation product is in the form of a methane sulfonate.

18. A light-sensitive reproduction material according to claim 15 in which the condensation product is a condensate of a 3-alkoxy-diphenylamine-4-diazonium salt and a diphenylether, diphenylsulfide, diphenylmethane or diphenyl compound.

19. A light-sensitive reproduction material according to claim 15 in which the condensation product contains the units A--N₂ X and B in a molar ratio between 1:

0.5 and 1;

2.

20. A light-sensitive reproduction material according to claim 15 containing the condensation product in a proportion of 2 to 20% by weight of the solids content.

21. A light-sensitive reproduction material according to claim 15 including a dispersed filler.

22. A light-sensitive reproduction material according to claim 21 in which the dispersed filler is a water-insoluble organic polymer.

23. A light-sensitive reproduction material according to claim 22 in which the water-insoluble organic polymer is a vinyl acetate polymer.

24. A light-sensitive reproduction material according to claim 15 in which the hydrophilic binder is polyvinyl alcohol.

25. A light-sensitive reproduction material according to claim 15 in which the condensation product is a condensate of 4,4'"'"'-bis-methoxymethyl-diphenylether and 3-methoxy-diphenylamine-4-diazonium sulfate.

26. A light-sensitive reproduction material according to claim 15 in which the condensation product is a condensate of 1,3-bis-hydroxymethyl-4,6-diisopropylbenzene and 3-methoxy-diphenylamine-4-diazonium sulfate.

27. A light-sensitive reproduction material according to claim 15 in which the condensation product is a condensate of 4,4'"'"'-bis-methoxymethyl diphenyl ether and 2,5,4'"'"'-triethoxy-diphenyl-4-diazonium sulfate.