US3772143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sizing paper with a sulphonium resin copolymer
Assignee: Dow Chemical Co
•
Filing: 1970-10-02
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Granted: 1973-11-13
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Expires: 1990-10-02
Abstract
Abstract Paper is effectively sized by incorporating a small quantity of a water-soluble sulfonium resin copolymer of 65-90 mole percent vinylbenzyl chloride-thiodiethanol adduct units and 35-10 mole percent of WHEREIN A is hydrogen, a lower alkyl group, a phenyl group or a tolyl group.
Inventors
- 👤 H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:17
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; C; C08; C08F; C08F8/00; C08F8/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
22 words
The method of claim 1 whrein the sulfonium resin is added to the cellulosic paper fiber in an aqueous papermaking fiber suspension.
Claim 2
Dependent Claim
19 words
The method of claim 1 wherein the sulfonium resin is added as an aqueous solution to a paper sheet.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein in unit (a), R is hydrogen, X represents a 2,2''-thiodiethanol moiety, and Y is a chloride anion, and in unit (b), A is a phenyl group.
Claim 4
Dependent Claim
17 words
The method of claim 4 wherein the sulfonium resin is used in a quantity of 0.1-0.5 percent.
Claim 5
Dependent Claim
8 words
Paper sized by the meThod of claim 1.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |