US3856558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of cellulose
Assignee: Individual
•
Filing: 1973-08-08
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Granted: 1974-12-24
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Expires: 1993-08-08
Abstract
Abstract Cellulosic materials are rendered water repellent by contacting a cellulosic material having a water content between about 2 and 7 weight percent with vapors of a lower alkyl silicon halide which reacts with water to form a siloxane and maintaining the cellulosic material and lower alkyl silicon halide in contact between about 0.1 and 8 seconds. The concentration of lower alkyl silicon halide and the temperature at which the contact is conducted are maintained so that the cellulosic material contacted with the lower alkyl silicon halide is rendered water repellent and has a pH greater than 2.5. The contact of cellulosic material and lower alkyl silicon halide can be conducted in the presence of a vaporous inert solvent for the lower alkyl silicon halide. The process eliminates the need for a subsequent step for neutralizing hydrogen halide formed as a byproduct of the reaction.
Inventors
- 👤 E Robbart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:35
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/13; D06; D06M; D06M13/00; D06M13/50; D06M13/51; D06M13/513
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
100 words
THE PROCESS FOR RENDERING A CELLULOSIC MATERIAL WATER REPELLENT WHICH COMPRISES CONTACTING A CELLULOSIC MATERIAL HAVING A WATER CONTENT BETWEEN ABOUT 2 AND 7 WEIGHT PERCENT WITH VAPORS OF A LOWER ALKYL SILICON HALIDE WHICH REACTS WITH WATER TO FORM A SILOXANE, MAINTAINING THE CELLULOSIC MATERIAL AND LOWER ALKYL SILICON HALIDE IN CONTACT BETWEEN ABOUT 0.1 AND 8 SECONDS, THE CONCENTRATION OF LOWER ALKYL SILICON HALIDE AND THE TEMPERATURE AT WHICH THE CONTACT IS CONDUCTED BEING MAINTAINED SO THAT THE CELLULOSIC MATERIAL CONTACT WITH THE LOWER ALKYL SILICON HALIDE IS RENDERED WATER REPELLENT AND HAS A PH GREATER THAN 2.5.
Claim 2
Dependent Claim
100 words
THE PROCESS FOR RENDERING A CELLULOSIC MATERIAL WATER REPELLENT WHICH COMPRISES CONTACTING A CELLULOSIC MATERIAL HAVING A WATER CONTENT BETWEEN ABOUT 2 AND 7 WEIGHT PERCENT WITH VAPORS OF A LOWER ALKYL SILICON HALIDE WHICH REACTS WITH WATER TO FORM A SILOXANE, MAINTAINING THE CELLULOSIC MATERIAL AND LOWER ALKYL SILICON HALIDE IN CONTACT BETWEEN ABOUT 0.1 AND 8 SECONDS, THE CONCENTRATION OF LOWER ALKYL SILICON HALIDE AND THE TEMPERATURE AT WHICH THE CONTACT IS CONDUCTED BEING MAINTAINED SO THAT THE CELLULOSIC MATERIAL CONTACT WITH THE LOWER ALKYL SILICON HALIDE IS RENDERED WATER REPELLENT AND HAS A PH GREATER THAN 2.5.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the cellulosic material has a water content between about 4 and 6 weight percent.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the contact time is between about 0.5 and 1.5 seconds.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the cellulosic material is paper.
Claim 6
Dependent Claim
11 words
The process of claim 2 wherein the cellulosic material is paper.
Claim 7
Dependent Claim
11 words
The process of claim 3 wherein the cellulosic material is paper.
Claim 8
Dependent Claim
48 words
The process of claim 1 wherein the said cellulosic material is contacted with a mixture of vapors of the lower alkyl silicon halide and vapors of a solvent for the lower alkyl silicon halide which solvent is nonreactive with the lower alkyl silicon halide or the cellulosic material.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherEin the cellulosic material has a water content between about 4 and 6 weight percent.
Claim 10
Dependent Claim
16 words
The process of claim 7 wherein the contact time is between about 0.5 and 1.5 seconds.
Claim 11
Dependent Claim
11 words
The process of claim 7 wherein the cellulosic material is paper.
Claim 12
Dependent Claim
11 words
The process of claim 8 wherein the cellulosic material is paper.
Claim 13
Dependent Claim
11 words
The process of claim 9 wherein the cellulosic material is paper.
Claim 14
Dependent Claim
48 words
The process of claim 1 wherein the cellulosic material is removed from contact with the lower alkyl silicon halide and is heated to remove hydrogen halide from the cellulosic material prior to a substantial portion of said hydrogen halide being dissolved in water contained in the cellulosic material.
Claim 15
Dependent Claim
11 words
The process of claim 13 wherein the cellulosic material is paper.
Claim 16
Dependent Claim
19 words
The process of claim 1 wherein said lower alkyl silicon halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
Claim 17
Dependent Claim
19 words
The process of claim 4 wherein said lower alkyl silicone halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
Claim 18
Dependent Claim
19 words
The process of claim 7 wherein said lower alkyl silicon halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
Claim 19
Dependent Claim
19 words
The process of claim 10 wherein said lower alkyl silicon halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
Claim 20
Dependent Claim
19 words
The process of claim 13 wherein said lower alkyl silicon halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
Claim 21
Dependent Claim
19 words
The process of claim 14 wherein said lower alkyl silicon halide comprises a methylchlorosilane or a mixture of methylchlorosilanes.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |