US3826712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic synthetic paper and method for producing the same acrylic fibers wet spun from a blend of hydrolyzed and unhydrolyzed acrylic polymers having at least 60 % acrylonitriles by weight and paper made from such fibers
Assignee: Asahi Kasei Corp
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Filing: 1973-01-03
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Granted: 1974-07-30
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Expires: 1993-01-03
Abstract
Abstract ACRYLIC SYNTHETIC PAPER HAVING AN IMPROVED STRENGTH IS PROVIDED. ACRYLIC POLYMER WAS DISSOLVED AND HYDROLYZED IN A CONCENTRATION NITRIC ACIID TO OBTAIN A POLYMER WITH A SWELLING WATER CONTENT BEING NO MORE THAN 200%; THE THUS HYDROLYZED POLYMER WAS BLENDED WITH UP TO 95% BY WEIGHT OF AN UNHYDROLYZED ACRYLIC POLYMER HAVING AN ACRYLONITRILE CONTENT OF AT LEAST 30% SUCH THAT THE TOTAL ACRYLONITRILE CONTENT IS AT LEAST 60% BY WEIGHT, THEN THE RESULTING BLEND WAS WET SPUN BY NITRILE ACID TO OBTAIN ACRYLIC FIBER; AND FURTHER THE RESULTANT ACRYLIC FIBER WAS BEATEN, COVERTED INTO A PAPER SHEET AND THEN DRIED TO OBTAIN THE ACRYLIC SYNTHETIC PAPER WITH AN IMPROVED STRENGTH.
Inventors
- 👤 T Kobayashi
- 👤 Y Terada
- 👤 Y Masuda
- 👤 H Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:27
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/20; D21H5/205; D01; D01F; D01F6/00; D01F6/44; D01F6/54; D21H13/00; D21H13/10; D21H13/12; D21H13/18
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |