Patent US3830655A successfully refreshed from Google Patents.
US3830655A
Expired / Lapsed
US
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Conductive papers
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1972-05-17
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Granted: 1974-08-20
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Expires: 1992-05-17
Abstract
Abstract Electrically conductive paper is made by coating or impregnating paper with a polymer containing at least 70 percent quaternised dialkylamino methylene acrylamide or methacrylamide groups, and then curing the polymer. The polymer must also have another property. Thus it may be defined as containing also methylolated acrylamide or methacrylamide units. Preferred polymers are made by the Mannich reaction. The polymers used cure under moderate conditions and are then resistant to leaching by moisture.
Inventors
- 👤 E Rothwell
- 👤 G Smalley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; G; G03; G03G; G03G5/00; G03G5/10; G03G5/105; G03G5/107
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
Electrically conductive paper according to claim 1 in which the polymer contains at least 10 percent of the methylolated groups.
Claim 2
Dependent Claim
12 words
Electrically conductive paper according to claim 1 in which R1 represents hydrogen.
Claim 3
Dependent Claim
15 words
Electrically conducTive paper according to claim 1 in which R2 and R3 both represent methyl.
Claim 4
Dependent Claim
16 words
Electrically conductive paper according to claim 1 in which R2, R3, and R4 each represent methyl.
Claim 5
Dependent Claim
12 words
Electrically conductive paper according to claim 1 in which X is Cl.
Claim 6
Dependent Claim
29 words
Electrically conductive paper according to claim 1 in which the polymer has been made by a process comprising reacting a polyacrylamide or polymethacrylamide with formaldehyde and a secondary amine.
Claim 7
Dependent Claim
41 words
Electrically conductive paper according to claim 1 in which the polymer has been made by reacting a polyacrylamide or polymethacrylamide with from 1 to 1.5 moles of each of formaldehyde and secondary amine relative to the amide groups in the polymer.
Claim 8
Dependent Claim
41 words
Electrically conductive paper according to claim 1 in which the polymer was applied as an aqueous solution having a substantially neutral pH and the paper was then dried and the composition cured to effect crosslinking of the polymer on the paper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |