Preoxidized fiber and process for producing the same
OwnerHiroyasu Ogawa, Tetsuro Shigei +3inventors
InventorsHiroyasu Ogawa, Tetsuro Shigei, Hayashi Takahashi, Tetuya Okabe, Fumio Miyatake
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Abstract
A preoxidized fiber suitable for producing carbon fiber, comprising preoxidizing an acrylic fiber having thereon an ammonium salt of a fatty ester represented by formula [A] and [B] ##STR1## wherein R.sub.1 is an aliphatic hydrocarbon group having from 11 to 17 carbon atoms; R.sub.2 and R.sub.3 can each be hydrogen, a lower alkyl group, a hydroxyethyl group, or an hydroxyisopropyl group; and X.crclbar. is an anion. The preoxidized fiber produced from the acrylic fiber has very little coalescence, and therefore high-strength carbon fiber can be obtained from this preoxidized fiber.
Claims20
A process for producing a preoxidized fiber, comprising contacting an acrylic fiber with a solution or dispersion of an ammonium salt of a fatty ester at a temperature of from 20.degree. to 70.degree. C., which solution or dispersion is at a pH of 4 or less, which solution or dispersion contains said ammonium salt of a fatty ester in an amount sufficient to provide from 0.01 to 0.5%, based on the weight of the fiber, of said ammonium salt of a fatty ester on said fiber, said ammonium salt of a fatty ester being represented by formula [A] ##STR7## wherein R.sub.1 is an aliphatic hydrocarbon group having from 11 to 17 carbon atoms;
- R.sub.2 and R.sub.3 can each be hydrogen, a lower alkyl group, a hydroxyethyl group, or an hydroxyisopropyl group;
- and X.sup..crclbar. is an anion, drying said fiber, and thereafter preoxidizing said fiber.
Dependencies are inferred from the claim text.