US2679449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulosic textiles reacted with aldehydes in an azeotropic medium
Assignee: Akzo Nobel UK PLC
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Filing: 1951-10-04
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Granted: 1954-05-25
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Expires: 1971-10-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Schappel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:24
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; Y; Y10; Y10S; Y10S8/00; Y10S8/17; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A METHOD COMPRISING THE STEP OF INTRODUCING A HYDROPHILIC, WATER-SWELLABLE, WATER-INSOLUBLE CELLULOSIC TEXTILE MATERIAL CONTAINING FREE HYDROCYL GROUPS IN THE MOLECULE INTO A HEATED REACTION MEDIUM WHICH EXERTS A CONTROLLED SWELLING ACTION ON THE TEXTILE AND CONTAINS WATER, BETWEEN 2.5% AND 10% BY WEIGHT OF AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, GLYOXAL, AND PYRUVIC ALDEHYDE, FROM 0.01 TO 1.5% BY WEIGHT OF AN ACID-REACTING CATALYST, AND BETWEEN 70 AND 95% BY VOLUME OF A WATERMISCIBLE LIQUID WHICH IS FREE FROM ANY SUBSTANTIAL SWELLING EFFECT ON THE TEXTILE AND DOES NOT REACT WITH THE ALDEHYDE UNDER ACID CONDITIONS, SAID WATER-MISCIBLE LIQUID HAVING AN AFFINITY FOR WATER GREATER THAN THAT OF CELLULOSE AND FORMING AN AZEOTROPE WITH WATER BOILING IN THE RANGE OF 80* TO 110* C., THE TEMPERATURE OF SAID MEDIUM BEING MAINTAINED SUBSTANTIALLY CONSTANT FROM THE TIME OF INTRODUCTION THROUGHOUT THE REACTION AT A POINT RAISED SUFFICIENTLY TO EFFECT REACTION BETWEEN THE TEXTILE MATERIAL AND THE ALDEHYDE BUT BELOW THE BOILING POINT OF THE MEDIUM UNDER THE PRESSURE PREVAILING DURING THE REACTION.
Claim 2
Independent Claim
175 words
A METHOD COMPRISING THE STEP OF INTRODUCING A HYDROPHILIC, WATER-SWELLABLE, WATER-INSOLUBLE CELLULOSIC TEXTILE MATERIAL CONTAINING FREE HYDROCYL GROUPS IN THE MOLECULE INTO A HEATED REACTION MEDIUM WHICH EXERTS A CONTROLLED SWELLING ACTION ON THE TEXTILE AND CONTAINS WATER, BETWEEN 2.5% AND 10% BY WEIGHT OF AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, GLYOXAL, AND PYRUVIC ALDEHYDE, FROM 0.01 TO 1.5% BY WEIGHT OF AN ACID-REACTING CATALYST, AND BETWEEN 70 AND 95% BY VOLUME OF A WATERMISCIBLE LIQUID WHICH IS FREE FROM ANY SUBSTANTIAL SWELLING EFFECT ON THE TEXTILE AND DOES NOT REACT WITH THE ALDEHYDE UNDER ACID CONDITIONS, SAID WATER-MISCIBLE LIQUID HAVING AN AFFINITY FOR WATER GREATER THAN THAT OF CELLULOSE AND FORMING AN AZEOTROPE WITH WATER BOILING IN THE RANGE OF 80* TO 110* C., THE TEMPERATURE OF SAID MEDIUM BEING MAINTAINED SUBSTANTIALLY CONSTANT FROM THE TIME OF INTRODUCTION THROUGHOUT THE REACTION AT A POINT RAISED SUFFICIENTLY TO EFFECT REACTION BETWEEN THE TEXTILE MATERIAL AND THE ALDEHYDE BUT BELOW THE BOILING POINT OF THE MEDIUM UNDER THE PRESSURE PREVAILING DURING THE REACTION.
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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |