Patent US3991256A successfully refreshed from Google Patents.
US3991256A
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Preparing electrostatographic printing sheet, article thereof and article coated with quaternary ammonium electroconductive resin
Assignee: Dow Chemical Co
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Filing: 1974-12-27
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Granted: 1976-11-09
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Expires: 1994-12-27
Abstract
Abstract An improved electroconductive resin composition is obtained by using a water-dispersible, film-forming acrylamide polymer as a binder and extender for a water-soluble quaternary ammonium electroconductive resin. Particularly useful is a self-binding blend of about 65-95 wt. % polyvinylbenzyltrimethylammonium chloride and about 5-35 wt. % nonhydrolyzed polyacrylamide which can be formulated as an aqueous dispersion with clay or other printing pigments. Applied to a nonmetallic substrate, such as paper or an organic polymer film, the improved electroconductive resin composition reduces the surface electrical resistivity of the substrate and also provides improved holdout to aromatic and aliphatic solvents.
Inventors
- 👤 Sally P. Cornier
- 👤 Ben A. Tefertiller
- 👤 Richard J. Dolinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/105; G03G5/107; C; C08; C08L; C08L25/00; C08L25/18; D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; D21H19/62; C08L33/00; C08L33/24; C08L33/26; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31895; Y10T428/31906; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
An electroconductive paper having incorporated as the electroconductive additive an electroconductive resin coating composition containing as essential elements: A. a water-soluble quaternary ammonium electroconductive resin, and B. about 0.05-0.50 parts, based on the weight of the electroconductive resin, of a water-dispersible, substantially nonionic acrylamide polymer containing at least 20 wt. % polymerized acrylamide and having a 0.5 wt. % aqueous solution viscosity of less than about 5.0 cps at pH 5-6 and 25° C in an amount effective to increase the surface electroconductivity of the treated paper.
Claim 2
Dependent Claim
87 words
An electroconductive paper having incorporated as the electroconductive additive an electroconductive resin coating composition containing as essential elements: A. a water-soluble quaternary ammonium electroconductive resin, and B. about 0.05-0.50 parts, based on the weight of the electroconductive resin, of a water-dispersible, substantially nonionic acrylamide polymer containing at least 20 wt. % polymerized acrylamide and having a 0.5 wt. % aqueous solution viscosity of less than about 5.0 cps at pH 5-6 and 25° C in an amount effective to increase the surface electroconductivity of the treated paper.
Claim 3
Dependent Claim
26 words
The electroconductive paper of claim 1 where the quaternary ammonium resin is a water-soluble poly(vinylbenzyl quaternary ammonium chloride), poly(diallyldimethylammonium chloride), quaternized polyethylenimine, or quaternized polyepichlorohydrin resin.
Claim 4
Dependent Claim
17 words
The electroconductive paper of claim 1 where the quaternary ammonium resin is a water-soluble poly(vinylbenzyltrimethylammonium chloride) resin.
Claim 5
Dependent Claim
46 words
The electroconductive paper of claim 1 where the acrylamide polymer is a homopolymer of acrylamide with a degree of hydrolysis of less than about 5 percent and a 0.5 wt. % aqueous solution viscosity of about 1.4 to 5.0 cps at pH 5-6 and 25° C.
Claim 6
Dependent Claim
31 words
The electroconductive paper of claim 1 where the acrylamide polymer is a water-dispersible polymer of about 20-95 wt. % acrylamide and about 80-5 wt. % of a nonionic monomer copolymerizable therewith.
Claim 7
Dependent Claim
52 words
The electroconductive paper of claim 1 where the electroconductive resin coating consists of about 25-50 wt. % of a water-soluble poly(vinylbenzyltrimethylammonium chloride), about 5-20 wt. % of a homopolymer of acrylamide with a degree of hydrolysis of less than about 5 percent, and about 40-70 wt. % of a paper coating pigment.
Claim 8
Dependent Claim
45 words
The electroconductive paper of claim 6 containing about 0.1-2.5 lbs. of the quaternary ammonium electroconductive resin per 3000 ft. 2 of paper coated two sides and having a surface electrical resistivity of less than about 10 11 ohms at 20°-25° C and 10% relative humidity.
Claim 9
Dependent Claim
120 words
In a process for preparing an electrostatographic printing sheet containing a water-soluble quaternary ammonium resin as an electroconductive additive, the improvement which comprises applying to the base substrate an electroconductive resin coating composition containing as essential elements: A. a water-soluble quaternary ammonium electroconductive resin, and B. about 0.05-0.50 parts, based on the weight of the electroconductive resin, of a water-dispersible, substantially nonionic acrylamide polymer containing at least 20 wt. % polymerized acrylamide and having a 0.5 wt. % aqueous solution viscosity of less than about 5.0 cps at pH 5-6 and 25° C in an amount sufficient to give the coated substrate a surface electrical resistivity of less than about 10 11 ohms at 20°-25° C and 10% relative humidity.
Claim 10
Dependent Claim
120 words
In a process for preparing an electrostatographic printing sheet containing a water-soluble quaternary ammonium resin as an electroconductive additive, the improvement which comprises applying to the base substrate an electroconductive resin coating composition containing as essential elements: A. a water-soluble quaternary ammonium electroconductive resin, and B. about 0.05-0.50 parts, based on the weight of the electroconductive resin, of a water-dispersible, substantially nonionic acrylamide polymer containing at least 20 wt. % polymerized acrylamide and having a 0.5 wt. % aqueous solution viscosity of less than about 5.0 cps at pH 5-6 and 25° C in an amount sufficient to give the coated substrate a surface electrical resistivity of less than about 10 11 ohms at 20°-25° C and 10% relative humidity.
Claim 11
Dependent Claim
11 words
An electrostatographic printing sheet prepared by the process of claim 8.
Claim 12
Dependent Claim
10 words
An electroconductive paper prepared by the process of claim 8.
Claim 13
Dependent Claim
27 words
The process of claim 8 wherein the electroconductive resin coating composition is a preformed blend of the water-soluble quaternary ammonium electroconductive resin and the water-dispersible acrylamide polymer.
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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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |