US4162275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-resistant fiber
Assignee: EIDP Inc
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Filing: 1977-06-17
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Granted: 1979-07-24
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Expires: 1997-06-17
Abstract
Abstract A fiber comprising poly(metaphenylene isophthalamide) containing distributed substantially throughout its whole interior finely divided cross-linked, phosphorus-containing resin deposits in an amount sufficient to provide at least 0.4% by weight of phosphorus, based on total weight of fiber. Fabrics of the fiber, as well as the fiber itself, have good flame resistance properties.
Inventors
- 👤 Gordon M. Moulds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/04; D01F11/08; C; C08; C08L; C08L77/00; D01F1/00; D01F1/02; D01F1/07; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D01F6/74
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A fiber comprising poly(metaphenylene isophthalamide) containing distributed substantially throughout its whole interior finely divided deposits comprised of a tetrakis hydroxymethyl phosphonium compound cross-linked to a reactive resin selected from the group of melamine formaldehyde condensates and phenol formaldehyde condensates in an amount sufficient to provide at least 0.4% by weight phosphorus, based on the total weight of fiber, the phosphonium compound and the reactive resin having been absorbed into water-swollen, never dried poly(methaphenylene isophthalamide) fibers before cross-linking.
Claim 2
Dependent Claim
77 words
A fiber comprising poly(metaphenylene isophthalamide) containing distributed substantially throughout its whole interior finely divided deposits comprised of a tetrakis hydroxymethyl phosphonium compound cross-linked to a reactive resin selected from the group of melamine formaldehyde condensates and phenol formaldehyde condensates in an amount sufficient to provide at least 0.4% by weight phosphorus, based on the total weight of fiber, the phosphonium compound and the reactive resin having been absorbed into water-swollen, never dried poly(methaphenylene isophthalamide) fibers before cross-linking.
Claim 3
Dependent Claim
15 words
The fiber of claim 1 wherein the weight of phosphorus is no more than 2.1%.
Claim 4
Dependent Claim
31 words
The fiber of claim 2 wherein the deposits are the reaction product of 2-4 parts phosphorus compound to each part resin compound and the weight of phosphorus is at least 0.7%.
Claim 5
Dependent Claim
20 words
The fiber of claim 1 wherein the deposits are the reaction product of tetrakis hydroxymethyl phosphonium compound and melamine-formaldehyde condensate.
Claim 6
Dependent Claim
8 words
A yarn of the fibers of claim 1.
Claim 7
Dependent Claim
8 words
A fabric of the yarn of claim 5.
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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |