US3954928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making sheet-formed reticulated fibrous structures
Assignee: Teijin Ltd
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Filing: 1974-04-29
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Granted: 1976-05-04
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Expires: 1994-04-29
Abstract
Abstract A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises: A. extruding a molten thermoplastic resin containing a foaming substance through a die with a slit clearance of 0.1 - 1.0mm; B. quenching the extrudate at a point less than 5mm away from the die surface to a temperature below the glass transition temperature of the resin; and C. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.
Inventors
- 👤 Akira Omori
- 👤 Isao Okamura
- 👤 Tadasi Imoto
- 👤 Tadayuki Katoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:28
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01D; B01D17/00; B01D17/02; B01D17/0202; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C44/56; B29C44/5618; D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; D04; D04H; D04H13/00; B29C55/00; B29C59/00; B29L; B29L2007/00; B29L2007/008; B29L2009/00; Y; Y10; Y10S; Y10S264/00; Y10S264/08; Y10S264/47; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises; a. extruding a molten thermoplastic resin containing a blowing agent through a die with a slit clearance of 0.1 -1.0 mm; b. quenching the extrudate at a point less than 5 mm away from the die surface to a temperature below the glass transition temperature of the resin; and c. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.
Claim 2
Dependent Claim
95 words
A process for the preparation of unopened sheet-formed and reticulated fibrous structures, which comprises; a. extruding a molten thermoplastic resin containing a blowing agent through a die with a slit clearance of 0.1 -1.0 mm; b. quenching the extrudate at a point less than 5 mm away from the die surface to a temperature below the glass transition temperature of the resin; and c. simultaneously drafting the extrudate at a draft ratio between the maximum draft ratio possible under the conditions and one-third thereof, thereby fibrillating the extrudate just as it leaves the die exit.
Claim 3
Dependent Claim
19 words
The process of claim 1, in which the thermoplastic resin has a glass transition temperature of at least 0°C.
Claim 4
Dependent Claim
19 words
The process of claim 1, in which the thermoplastic resin has a glass transition temperature of at least 40°C.
Claim 5
Dependent Claim
30 words
The process of claim 1, in which the thermoplastic resin is selected from styrene resins, polyamide resins, polyester resins, vinyl resins, polycarbonate resins, acrylic resins, and copolymers and blends thereof.
Claim 6
Dependent Claim
37 words
The process of claim 1, in which the thermoplastic resin is a blend of polystyrene or nylon and at most 40 % by weight based on the blend of a polyolefin selected from polyethylene, polypropylene and polybutene-1.
Claim 7
Dependent Claim
39 words
The process of claim 1, in which the extrudate is quenched to a temperature at least 5°C. lower than the glass transition temperature of the resin by blowing cooled air against said extrudate just as it leaves the die.
Claim 8
Dependent Claim
31 words
The process of claim 3, in which the extrudate is quenched to any temperatures between the temperature 5°C. lower than the glass transition temperature of the resin and the room temperature.
Claim 9
Dependent Claim
24 words
The process of claim 1, in which the draft ratio is effected between the maximum draft ratio possible under the conditions and three-fourths thereof.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |