US3899387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making paper using mono-isocyanate capped poly (oxyalkylene) diols as a re-wetting and defoaming agent
Assignee: Diamond Shamrock Chemicals Co
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Filing: 1973-04-11
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Granted: 1975-08-12
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Expires: 1993-04-11
Abstract
Abstract The disclosed diaryl urethanes are made by capping poly(oxyalkylene) diols with monoisocyanates. These diurethanes are characterized by a desirable hydrophobe/hydrophile balance typically evidenced by low cloud points, the ability to form micelles in aqueous media, the ability to reduce stable foam, and the ability to be taken up and retained by paper fibers, thereby imparting increased hydrophilic character to paper sheets made from the fiber. The low foaming or de-foaming capability of these compounds is particularly useful in paper re-wet compositions and machine dishwashing detergents and additives. The hydrophobe/hydrophile balance is typically obtained through a combination of oxyethylene and oxypropylene units or blocks in the oxyalkylene chain.
Inventors
- 👤 Richard E Freis
- 👤 Larry M Rue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/70; C08G18/71; C11; C11D; C11D1/00; C11D1/38; C11D1/50; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
IN A METHOD FOR INCREASING THE HYDROPHILIC PROPERTIES OF A WATERLAID SHEET AND PROVIDING A DE-FORMING ACTION DURING THE FORMATION OF THE WATERLAID SHEET ON A PAPER-MAKING MACHINE, SAID WATERLAID SHEET BEING FORMED FROM A PAPER-MAKING SLURRY, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF: A. TREATING THE FIBERS IN SAID PAPER-MAKING SLURRY, AND DEFOAMIN SAID PAPER-MAKING SLURRY, WITH AN EFFECTIVE AMOUNT OF A RE-WET COMPOSITION, HAVING DE-FORMING PROPERTIES, THE ACTIVE PORTION OF SAID RE-WET COMPOSITION COMPRISING AT LEAST ABOUT 25% BY WEIGHT OF A DIARYL URETHANE HAVING A CLOUD POINT, AT 1 WEIGHT PERCENT IN WATER, BELOW 45*C., AND HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
104 words
IN A METHOD FOR INCREASING THE HYDROPHILIC PROPERTIES OF A WATERLAID SHEET AND PROVIDING A DE-FORMING ACTION DURING THE FORMATION OF THE WATERLAID SHEET ON A PAPER-MAKING MACHINE, SAID WATERLAID SHEET BEING FORMED FROM A PAPER-MAKING SLURRY, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF: A. TREATING THE FIBERS IN SAID PAPER-MAKING SLURRY, AND DEFOAMIN SAID PAPER-MAKING SLURRY, WITH AN EFFECTIVE AMOUNT OF A RE-WET COMPOSITION, HAVING DE-FORMING PROPERTIES, THE ACTIVE PORTION OF SAID RE-WET COMPOSITION COMPRISING AT LEAST ABOUT 25% BY WEIGHT OF A DIARYL URETHANE HAVING A CLOUD POINT, AT 1 WEIGHT PERCENT IN WATER, BELOW 45*C., AND HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 3
Dependent Claim
41 words
A method according to claim 1 wherein said effective amount of said composition is about 5 to about 120 pounds per ton of said waterlaid sheet, and wherein at least about 25% by weight of said composition comprises said diaryl urethane.
Claim 4
Dependent Claim
37 words
A method according to claim 1 wherein the increase in hydrophilicity with said effective amount of said composition is indicated by an at least 10 fold reduction in the re-wet time as determined by said re-wet test.
Claim 5
Dependent Claim
105 words
A method according to claim 1 wherein said diaryl urethane has a molecular weight in the range of about 700-6,500 and the following structural formula: phi -NH-CO-O-PO)a(EO)b(AO)c(EO)d(PO)eCO-NH- phi wherein phi represents a phenyl group, PO represents a propyleneoxy group, EO represents an ethyleneoxy group, AO represents an alkyleneoxy group of 2-3 carbon atoms, (AO)c being a homopolymer of propyleneoxy units or a copolymer of propyleneoxy units and ethyleneoxy units, and a, b, c, d, and e are the same or different and are numbers selected such that all of the following ratios, (a+e):(a+b+c+d+e), (b+d):(a+b+c+d+e), and c: (a+b+c+d+e), are in the range of 0.3 - 0.4:1.
Claim 6
Dependent Claim
13 words
A method according to claim 1 wherein said Ar and Ar'' are monocyclic.
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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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |