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US3853561A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the preparation of screen printing stencils using intermediate support for light sensitive layer

Assignee: Hoechst AG
•
Filing: 1973-08-29
•
Granted: 1974-12-10
•
Expires: 1993-08-29
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Abstract

Abstract This invention relates to a process for the preparation of screen printing stencils with the aid of an intermediate support for the copying layer, which comprises providing a sheet-like intermediate support with a layer comprising at least one binder and at least one diazonium salt of the general formula WHEREIN R1, R2, R3, and R4 are selected from the group consisting of hydrogen atoms, halogen atoms, alkyl groups with 1 or 2 carbon atoms, or alkoxy groups with 1 to 4 carbon atoms, Y is selected from the group consisting of a single bond, or one of the groups -O-, -S-, -NH-, or -CONH-, and X is the anion of the diazonium salt, OR A DIAZO AMINO COMPOUND DERIVED FROM SUCH DIAZONIUM SALT; PRESSING THE LAYER SIDE OF THE LIGHT-SENSITIVE MATERIAL THUS PRODUCED UPON A SCREEN PRINTING SUPPORT WHICH BEFORE OR AFTER CONTACT WITH THE LIGHT-SENSITIVE LAYER IS MOISTENED WITH A SOLUTION OF AT LEAST ONE ALDEHYDE OR AT LEAST ONE COMPOUND CONTAINING AT LEAST ONE SUBSTITUENT OF THE FORMULA

Inventors

  • 👤 W Urban
  • 👤 M Reichel
  • 👤 H Ruckert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 15:26
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/12

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 54 words
A PROCESS FOR THE PREPARATION OF SCREEN PRINTING STENCILS WHICH COMPRISES THE FOLLOWING STEPS IN THE FOLLOWING ORDER A. PROVIDING A SHEET-LIKE INTERMEDIATE SUPPORT WITH A LAYER COMPRISING AT LEAST ONE CROSS-LINKABLE BINDER CAPABLE OF SEELLING IN WATER OR SOLUBLE IN WATER AND AT LEAST ONE CONDENSABLE AROMATIC DIAZONIUM SALT OF THE GENERAL FOR-
Claim 2
Dependent Claim 54 words
A PROCESS FOR THE PREPARATION OF SCREEN PRINTING STENCILS WHICH COMPRISES THE FOLLOWING STEPS IN THE FOLLOWING ORDER A. PROVIDING A SHEET-LIKE INTERMEDIATE SUPPORT WITH A LAYER COMPRISING AT LEAST ONE CROSS-LINKABLE BINDER CAPABLE OF SEELLING IN WATER OR SOLUBLE IN WATER AND AT LEAST ONE CONDENSABLE AROMATIC DIAZONIUM SALT OF THE GENERAL FOR-
Claim 3
Dependent Claim 21 words
A process according to claim 1, in which the intermediate support is stripped before the light-sensitive screen printing material is exposed.
Claim 4
Dependent Claim 20 words
A process according to claim 1 in which the screen printing support is moistened with an aqueous solution of formaldehyde.
Claim 5
Dependent Claim 18 words
A process according to claim 3, in which a 5 to 7 per cent formaldehyde solution is used.
Claim 6
Dependent Claim 23 words
A process according to claim 1 in which the screen printing support is moistened with an aqueous solution of an N-methylol acid amide.
Claim 7
Dependent Claim 19 words
A process according to claim 5 in which a 3 to 7 per cent solution of N,N''-dimethylol-urea is used.
Claim 8
Dependent Claim 26 words
A process according to claim 1 in which a diazonium salt corresponding to the general formula I is used in which Y is an -NH- group.
Claim 9
Dependent Claim 15 words
A process according to claim 1 in which the binder is a vinyl alcohol polymer.
Claim 10
Dependent Claim 14 words
A process according to claim 1 in which the binder is soluble in water.
Claim 11
Dependent Claim 31 words
A process according to claim 1 in which the light-sensitive layer is moistened by moistening the screen printing support before or after pressing said light-sensitive layer on said screen printing support.
Claim 12
Dependent Claim 38 words
A process according to claim 1 in which step (c) is performed with a solution of at least one compound of the general formula A(-CH3-nZn)m in which A, Z, m and n are as stated in claim 1.

References Cited (Backward Citations)

US3143417A Cited
US3245792A Cited
US3189451A Cited
US3322541A Cited
US3246986A Cited
US3390993A Cited
US3507651A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-09 1978-06-10 1978-12-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-09 1982-06-10 1982-12-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-09 1986-06-10 1986-12-10 $7700.00 Window Closed / Lapsed

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