US3840395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized glycol plasticized cellulosic sheets
Assignee: FMC Corp
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Filing: 1972-03-24
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Granted: 1974-10-08
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Expires: 1992-03-24
Abstract
Abstract Fibrous and non-fibrous cellulosic sheets containing plasticizing amounts of polyalkylene glycols with buffering agents to prevent deterioration of the glycol and subsequent cellulose degradation promoted by the acidic products of glycol deterioration.
Inventors
- 👤 W Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:57
CPC Classifications
C; C08; C08L; C08L1/00; C08J; C08J7/00; C08J7/04; C08J7/0427; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/04; C08K5/06; C08L71/00; C08L71/02; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/53; C08J2301/00; C08J2301/06; C08J2471/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
43 words
FIBROUS AND NON-FIBROUS WATER-INSOLUBLE, HYDROPHILIC CELLULOSIC SHEETS CONTAINING A PLASTICIZING AMOUNT OF A POLYALKYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 250 AND A BUFFERING AGENT WHICH BUFFERS THE PLASTICIZED SHEET TO A PH OF BETWEEN ABOUT 5 AND ABOUT 8.5.
Claim 2
Dependent Claim
43 words
FIBROUS AND NON-FIBROUS WATER-INSOLUBLE, HYDROPHILIC CELLULOSIC SHEETS CONTAINING A PLASTICIZING AMOUNT OF A POLYALKYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 250 AND A BUFFERING AGENT WHICH BUFFERS THE PLASTICIZED SHEET TO A PH OF BETWEEN ABOUT 5 AND ABOUT 8.5.
Claim 3
Dependent Claim
26 words
The cellulosic sheet of claim 1 wherein the polyalkylene glycol is a polyethylene glycol having an average molecular weight ranging between about 250 and about 600.
Claim 4
Dependent Claim
23 words
The cellulosic sheet of claim 1 wherein the buffering agent buffers the sheet to a pH of from about 6 to about 8.
Claim 5
Dependent Claim
24 words
The cellulosic sheet of claim 1 wherein the sheet also contains butylated hydroxyanisole in an amount sufficient to suppress oxidation of the polyalkylene glycol.
Claim 6
Dependent Claim
15 words
The cellulosic sheet of claim 1 wherein the sheet is a non-fibrous regenerated cellulose film.
Claim 7
Dependent Claim
51 words
The cellulosic sheet of claim 5 wherein the polyalkylene glycol is polyethylene glycol having an average molecular weight ranging between about 250 and about 600 and said glycol is present in the film in an amount ranging between about 75 and about 120 percent based on the weight of the cellulose.
Claim 8
Dependent Claim
23 words
The cellulosic sheet of claim 6 wherein the buffering agent is a mixture of dibasic alkali metal phosphate and monobasic alkali metal phosphate.
Claim 9
Dependent Claim
27 words
The cellulosic sheet of claim 6 wherein the film also contains from about 50 to about 1,000 parts of butylated hydroxyanisole per million parts of said glycol.
Claim 10
Independent Claim
68 words
A method of preparing a deterioration resistant polyalkylene glycol plasticized, water-insoluble, hydrophilic cellulosic sheet which comprises passing a water-insoluble, hydrophilic cellulosic sheet in contact with an aqueous medium containing a polyalkylene glycol having an average molecular weight of at least 250 in an amount sufficient to plasticize said sheet and a buffering agent which maintains the aqueous medium at a pH of between about 5 and about 8.5.
Claim 11
Independent Claim
68 words
A method of preparing a deterioration resistant polyalkylene glycol plasticized, water-insoluble, hydrophilic cellulosic sheet which comprises passing a water-insoluble, hydrophilic cellulosic sheet in contact with an aqueous medium containing a polyalkylene glycol having an average molecular weight of at least 250 in an amount sufficient to plasticize said sheet and a buffering agent which maintains the aqueous medium at a pH of between about 5 and about 8.5.
Claim 12
Dependent Claim
54 words
The method of claim 9 wherein the cellulosic sheet is a regenerated cellulose film, the polyalkylene glycol is polyethylene glycol having an average molecular weight ranging between about 250 and about 600, and the aqueous medium also contains from about 50 to about 1,000 parts of butylated hydroxyanisole per million parts of said glycol.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |