US4137046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent cellulosic paper and method for making the same
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1976-10-04
•
Granted: 1979-01-30
•
Expires: 1996-10-04
Abstract
Abstract A transparent cellulosic paper is produced by coating or impregnating a cellulosic paper with an organic solvent solution containing a compound having a weight-average molecular weight of 200 to 2,000 and having at least two isocyanate groups in a molecule or with an organic solvent solution containing, in addition to said compound, at least one compound selected from the group consisting of an aliphatic monohydric alcohol having 6 to 18 carbon atoms and a nonionic surface active agent to the polyethylene glycol type having one hydroxyl group in a molecule, the ratio OH/NCO in the solution being less than 1; removing said organic solvent; and allowing the coated or impregnated paper to harden by aging.
Inventors
- 👤 Takashi Koike
- 👤 Masahiro Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:58
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/26; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/57; G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/785; Y; Y10; Y10S; Y10S428/00; Y10S428/918; Y10S8/00; Y10S8/11; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A method for producing a transparent cellulosic paper which consists essentially of coating or impregnating a cellulosic paper with an organic solvent solution consisting essentially of the organic solvent and a compound having a weight-average molecular weight of 200 to 2,000 and having at least two isocyanate groups in the molecule; removing said organic solvent; and allowing the resulting coated or impregnated cellulosic paper to harden by aging, the amount of said compound being sufficient to make the cellulosic paper transparent by filling the pores of the cellulosic paper.
Claim 2
Independent Claim
89 words
A method for producing a transparent cellulosic paper which consists essentially of coating or impregnating a cellulosic paper with an organic solvent solution consisting essentially of the organic solvent and a compound having a weight-average molecular weight of 200 to 2,000 and having at least two isocyanate groups in the molecule; removing said organic solvent; and allowing the resulting coated or impregnated cellulosic paper to harden by aging, the amount of said compound being sufficient to make the cellulosic paper transparent by filling the pores of the cellulosic paper.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein the cellulosic paper is impregnated with 23.8% of said compound.
Claim 4
Independent Claim
147 words
A method for producing a transparent cellulosic paper which consists essentially of coating or impregnating a cellulosic paper with an organic solvent solution consisting essentially of the organic solvent and (a) a compound having a weight-average molecular weight of 200 to 2,000 and having at least two isocyanate groups in the molecule and (b) at least one compound selected from the group consisting of an aliphatic monohydric alcohol having 6 to 18 carbon atoms and a nonionic surface active agent of the polyethylene glycol type having one hydroxyl group in the molecule, said compounds (a) and (b) being contained in a ratio of OH/NCO < 1; removing said organic solvent; and allowing the resulting coated or impregnated cellulosic paper to harden by aging, the amount of said compounds (a) and (b) being sufficient to make the cellulosic paper transparent by filling the pores of the cellulosic paper.
Claim 5
Independent Claim
147 words
A method for producing a transparent cellulosic paper which consists essentially of coating or impregnating a cellulosic paper with an organic solvent solution consisting essentially of the organic solvent and (a) a compound having a weight-average molecular weight of 200 to 2,000 and having at least two isocyanate groups in the molecule and (b) at least one compound selected from the group consisting of an aliphatic monohydric alcohol having 6 to 18 carbon atoms and a nonionic surface active agent of the polyethylene glycol type having one hydroxyl group in the molecule, said compounds (a) and (b) being contained in a ratio of OH/NCO < 1; removing said organic solvent; and allowing the resulting coated or impregnated cellulosic paper to harden by aging, the amount of said compounds (a) and (b) being sufficient to make the cellulosic paper transparent by filling the pores of the cellulosic paper.
Claim 6
Dependent Claim
20 words
A method for producing a transparent cellulosic paper according to claim 3, wherein the ratio OH/NCO is OH/NCO < 0.7.
Claim 7
Dependent Claim
19 words
A method according to claim 3 wherein the cellulosic paper is impregnated with 11.4% to 28.0% of said compounds.
Claim 8
Dependent Claim
12 words
A transparent cellulosic paper obtained by the method according to claim 1.
Claim 9
Dependent Claim
12 words
A transparent cellulosic paper obtained by the method according to claim 3.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |