US4389476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier coat for electrostatic master
Assignee: ALLIED PAPER INCORPORATED A CORP OF DE
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Filing: 1981-10-27
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Granted: 1983-06-21
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Expires: 2001-10-27
Abstract
Abstract A method for the preparation of electrostatic masters, and product prepared thereby, said masters having improved water and pick resistance for lithographic printing. The method comprises applying a barrier coat formulation to a substrate wherein the formulation contains an aqueous dispersion of a copolymer of at least about 60% ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3 to about 40% of a polymerizable olefinically unsaturated monomer having polar functionality.
Inventors
- 👤 Michael J. Whalen-Shaw
- 👤 Robert J. Thiessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:36
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A method for the preparation of electrostatic masters having improved water and pick resistance for lithographic printing comprising the steps of (a) applying to a base a barrier coat formulation which comprises an aqueous dispersion of a copolymer of at least about 60% ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3% to about 40% of a polymerizable olefinically unsaturated monomer having polar functionality; (b) drying the formed barrier coat; and (c) applying to said barrier coat a photoconductive coating comprising a photoconductive material and binder.
Claim 2
Independent Claim
87 words
A method for the preparation of electrostatic masters having improved water and pick resistance for lithographic printing comprising the steps of (a) applying to a base a barrier coat formulation which comprises an aqueous dispersion of a copolymer of at least about 60% ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3% to about 40% of a polymerizable olefinically unsaturated monomer having polar functionality; (b) drying the formed barrier coat; and (c) applying to said barrier coat a photoconductive coating comprising a photoconductive material and binder.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said copolymer comprises ethylene polymerized with acrylic, methacrylic or crotonic acid.
Claim 4
Dependent Claim
9 words
The method of claim 1 employing a paper base.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein said barrier coat formulation is applied in a film forming amount, the base surface being substantially impervious to penetration of the barrier coat formulation during application of such formulation.
Claim 6
Dependent Claim
36 words
The method of claim 4 wherein said barrier coat formulation is applied at a coat weight such as to obtain a resistivity less than about 10 11 OHMS per square for the barrier coat and base.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the barrier coat weight, dry basis, is about 0.4-1 lb. per 3300 square feet.
Claim 8
Dependent Claim
42 words
The method of claim 4 wherein said base has applied to it a calendered precoat beneath said barrier coat, said precoat comprising a binding amount of a synthetic resin binder and a filler, at least 10% of said filler being plastic particles.
Claim 9
Dependent Claim
12 words
An electrostatic master prepared by any of the methods of claims 1-7.
Claim 10
Independent Claim
119 words
A method for the preparation of base paper suitable for electrostatic masters having improved water and pick resistance for lithographic printing comprising the steps of (a) applying to a paper substrate a barrier coat formulation which comprises an aqueous dispersion of a copolymer of at least about 60% ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3% to about 40% of a polymerizable olefinically unsaturated monomer having polar functionality; (b) drying the formed barrier coat, the conditions of application and drying providing a thin water impervious film; (c) said barrier coat formulation being applied at a coat weight such as to obtain a resistivity less than about 10 11 OHMS per square for the barrier coat and base.
Claim 11
Independent Claim
119 words
A method for the preparation of base paper suitable for electrostatic masters having improved water and pick resistance for lithographic printing comprising the steps of (a) applying to a paper substrate a barrier coat formulation which comprises an aqueous dispersion of a copolymer of at least about 60% ethylenically unsaturated polymerizable monomer having non-polar functionality and about 3% to about 40% of a polymerizable olefinically unsaturated monomer having polar functionality; (b) drying the formed barrier coat, the conditions of application and drying providing a thin water impervious film; (c) said barrier coat formulation being applied at a coat weight such as to obtain a resistivity less than about 10 11 OHMS per square for the barrier coat and base.
Claim 12
Dependent Claim
72 words
The method of claim 9 wherein said barrier coat weight, dry basis, is about 0.4-1 lb. per 3300 square feet, the continuity of said coat being sufficient to limit the water absorption, as measured by a 21/2 minute Cobb test to less than about 10 grams per square meter, the substrate during application of the barrier coat being substantially impervious to penetration of the barrier coat formulation during application of such formulation.
Claim 13
Dependent Claim
19 words
The method of claim 10 wherein the said water absorption is less than about 4 grams per square meter.
Claim 14
Dependent Claim
41 words
The method of claim 10 wherein said base has applied to it a precoat beneath said barrier coat, said precoat comprising a binding amount of a synthetic resin binder and a filler, at least 10% of said filler being plastic particles.
Claim 15
Dependent Claim
30 words
The method of claim 9 wherein said barrier coat formulation contains plastic particles filler, the plastic particles being non film-forming under conditions of application and drying of the barrier coat.
Claim 16
Dependent Claim
14 words
An electrostatic master base paper prepared by any of the methods of claims 9-13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |