Claims
- 1. An acrylic fiber capable of being oxidized in one or more stages at a temperature of at least 10.degree. C. below the stick temperature of fibers entering that stage to a density of at least 1.36 g/cm.sup.3 in 4-20 minutes consisting essentially of 93-99.4% mol percent acrylonitrile units, 0.6-4.0 mol percent ammonium or amine salts having an intermediate amine having a pK.sub.b of 5 or less, as neutralizing cations for sulfuric or sulfonic acid end groups derived from the initiator and activator, if present, and as neutralizing cations for sulfonic acid groups incorporated into the polymer by copolymerization of one or more copolymerizable, sulfonic acid containing comonomers selected from the group consisting of styrene sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid, 2-acrylamido-2 methylpropane sulfonic acid and ethylene sulfonic acid and substantially the remaining mol percent comprised of non-ionic vinyl comonomers and containing less than 100 parts per million of metallic cations.
- 2. The fiber of claim 1 containing 0.8-2.0 mol percent of sulfonic acid groups and ammonium or amine salts having an intermediate amine having a pK.sub.b of less than 5.
- 3. The fiber of claim 2 wherein the sulfonic acid group is 2-acrylamido-2-methyl propane sulfonic acid.
Parent Case Info
This application is a continuation of application Ser. No. 593,172, filed Mar. 26, 1984, now abandoned; which is a continuation of application Ser. No. 347,729, filed Feb. 10, 1982, now abandoned; which in turn is a continuation of application Ser. No. 230,030, filed Jan. 30, 1981, now U.S. Pat. No. 4,336,022; which in turn is a continuation-in-part of application Ser. No. 62,908, filed Aug. 1, 1979, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
53-7531 |
Mar 1978 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Research Disclosure No. 15728 (May 1977), p. 15. |
Continuations (3)
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Number |
Date |
Country |
Parent |
593172 |
Mar 1984 |
|
Parent |
347729 |
Feb 1982 |
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Parent |
230030 |
Jan 1981 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
62908 |
Aug 1979 |
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