US3878178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and process
Assignee: EIDP Inc
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Filing: 1973-04-26
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Granted: 1975-04-15
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Expires: 1993-04-26
Abstract
Abstract This application discloses acrylic fibers having high tenacity, a break elongation of 8-18% and a shrinkage in boiling water of 13-26% in combination with an X-ray porosity index less than about 1.5 in the void size range of each of 45-90A and 90-140A and a molecular orientation of at least about 66.5, the particular fiber having the chemical composition of 93-95% acrylonitrile, 5-7% methylacrylate and up to 0.5% sodium styrene sulfonate. The fibers are prepared by specific drawing, drying and redrawing steps.
Inventors
- 👤 Gail Crolley Guinn
- 👤 Jr Joseph W Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:54
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D01; D01F; D01F6/00; D01F6/28; D01F6/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A TOW OF ACRYLIC FILAMENT, SAID ACRYLIC FILAMENTS CONSISTING ESSENTIALLY OF 93.9% ACRYLONITRILE, 6% METHYLACRYLATE AND 0.1% SODIUM STYRENE SULFONATE, THE FILAMENTS HAVE AN X-RAY POROSITY INDEX OF 1.27-1.47 IN THE VOID SIZE RANGE OF 45-90A AND 1.18-1.35 IN THE VIOD SIZE RANGE OF 90-140A, A MOLECULAR ORIENTATION OF 68.9-73.8%, A BRAKE ELONGATION OF 14.6-15.2%, A SHRINKAGE IN BOILING WATER OF 14.7-16.6% AND A BREAK TENACITY OF ABOUT 4.0 GPD.
Claim 2
Dependent Claim
70 words
A TOW OF ACRYLIC FILAMENT, SAID ACRYLIC FILAMENTS CONSISTING ESSENTIALLY OF 93.9% ACRYLONITRILE, 6% METHYLACRYLATE AND 0.1% SODIUM STYRENE SULFONATE, THE FILAMENTS HAVE AN X-RAY POROSITY INDEX OF 1.27-1.47 IN THE VOID SIZE RANGE OF 45-90A AND 1.18-1.35 IN THE VIOD SIZE RANGE OF 90-140A, A MOLECULAR ORIENTATION OF 68.9-73.8%, A BRAKE ELONGATION OF 14.6-15.2%, A SHRINKAGE IN BOILING WATER OF 14.7-16.6% AND A BREAK TENACITY OF ABOUT 4.0 GPD.
Claim 3
Dependent Claim
20 words
The tow of claim 1 in the form of a ball warp having a density of filaments of 45 lbs./ft.3.
Claim 4
Dependent Claim
18 words
A carton of the tow of claim 1, said tow having a density of filaments of 45 lbs./ft.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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |