US4007148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive coatings having excellent coating holdout properties
Assignee: Dow Chemical Co
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Filing: 1974-12-19
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Granted: 1977-02-08
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Expires: 1994-12-19
Abstract
Abstract An electroconductive composition useful for coating raw paper stock is provided by combining (1) an electroconductive resin, e.g., poly(vinyl/benzyl trimethyl ammonium chloride) and (2) a water-swellable, cross-linked polymer, e.g., crosslinked polyacrylamide, in the form of discrete particles having swollen diameters in the range from about 1 to about 100 micrometers. Application of this electroconductive coating composition to paper or to some other nonconductive substrate yields an article having decreased surface electrical resistivity and increased organic solvent resistance or holdout. Solvent resistance and other coating properties are further enhanced by including in the electroconductive composition a water-dispersible, film-forming amide polymer and a low viscosity binder such as a latex of styrene/butadiene copolymer.
Inventors
- 👤 Sally P. Ginter
- 👤 Ralph E. Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:37
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/24; D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/20; G; G03; G03G; G03G5/00; G03G5/10; G03G5/105; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
An aqueous coating composition comprising as ingredients ( 1) a water-dispersible, electroconductive polymer in an amount sufficient to reduce the surface electrical resistivity of a non-conductive substrate having its surface coated with said composition to a value no greater than 10 12 ohms at 20% relative humidity, and (2) a water-swellable polymer having an average particle diameter when dispersed in the aqueous coating composition in the range from about 1 to about 100 micrometers, said water-swellable polymer being present in an amount sufficient to provide coating holdout when the composition is applied to raw paper stock.
Claim 2
Dependent Claim
96 words
An aqueous coating composition comprising as ingredients ( 1) a water-dispersible, electroconductive polymer in an amount sufficient to reduce the surface electrical resistivity of a non-conductive substrate having its surface coated with said composition to a value no greater than 10 12 ohms at 20% relative humidity, and (2) a water-swellable polymer having an average particle diameter when dispersed in the aqueous coating composition in the range from about 1 to about 100 micrometers, said water-swellable polymer being present in an amount sufficient to provide coating holdout when the composition is applied to raw paper stock.
Claim 3
Dependent Claim
43 words
The aqueous composition of claim 1 which comprises from about 10 to about 99.9 dry weight parts of the electroconductive polymer and from about 0.1 to about 25 dry weight parts of the water-swellable polymer per 100 dry weight parts of said composition.
Claim 4
Dependent Claim
32 words
The aqueous composition of claim 2 which also contains a nonionic, film-forming, water-dispersible polymer of an α,β-ethylenically unsaturated amide, said nonionic polymer being compatible with ingredients (1) and (2) of claim 1.
Claim 5
Dependent Claim
20 words
The aqueous composition of claim 2 which also contains a binder compatible with ingredients (1) and (2) of claim 1.
Claim 6
Dependent Claim
78 words
The aqueous composition of claim 1 comprising (1) from about 20 to about 55 weight parts of the electroconductive polymer; (2) from about 5 to about 30 weight parts of a nonionic, film-forming, water-dispersible amide polymer; (3) from about 20 to about 50 weight parts of a compatible binder; and (4) from about 0.1 to about 1 weight part of the water-swellable polymer, said parts being dry weight parts and based on dry weight parts of said composition.
Claim 7
Dependent Claim
15 words
The aqueous composition of claim 5 wherein the water-swellable polymer is a crosslinked poly(acrylic acid).
Claim 8
Dependent Claim
14 words
The aqueous composition of claim 5 wherein the water-swellable polymer is a crosslinked polyacrylamide.
Claim 9
Dependent Claim
43 words
The aqueous composition of claim 5 wherein the electroconductive polymer is a poly(vinyl benzyltrimethylammonium)chloride, the amide polymer is a polyacrylamide, the binder is a compatible latex of a styrene/butadiene copolymer and the water-swellable polymer is a crosslinked poly(acrylic acid) or a crosslinked polyacrylamide.
Claim 10
Dependent Claim
16 words
The composition of claim 1 in the form of a coating adhered to a non-conductive substrate.
Claim 11
Dependent Claim
10 words
The composition of claim 9 wherein the substrate is paper.
Claim 12
Dependent Claim
16 words
The composition of claim 1 in the form of an electroconductive additive in an electroconductive article.
Claim 13
Dependent Claim
19 words
An electroconductive paper comprising a paper substrate and a dried coating of the composition of claim 1 adherent thereto.
Claim 14
Dependent Claim
10 words
A dried electroconductive coating of the composition of claim 1.
Claim 15
Dependent Claim
29 words
The aqueous coating composition of claim 1 wherein the water-swellable polymer is a water-insoluble polymer that is retained on a membrane filter having a pore size of 1.2 micrometer.
Claim 16
Dependent Claim
104 words
The aqueous coating composition of claim 14 wherein (1) the water-swellable polymer can absorb from about 4 to about 100 weight parts of water per weight part of water-swellable polymer when the water-swellable polymer is placed in an ionic medium provided by the electroconductive polymer and (2) a 0.01 weight percent aqueous solution of said water-swellable polymer will reduce the flow of the dispersion through a filter having a diameter of 13 mm and a pore size of 1.2 micrometer to less than 0.5 cm 3 /min after 4 cm 3 of the dispersion has passed through the filter at pressure of 3.2 psig.
Claim 17
Dependent Claim
27 words
The aqueous coating composition of claim 15 wherein the water-swellable polymer is a crosslinked polyacrylic acid microgel having particles with diameters in the range of 25-50 micrometers.
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |