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US 11,879,205 B2Granted
Treatment agent for carbon fiber precursor, aqueous solution of treatment agent for carbon fiber precursor, carbon fiber precursor, and method for producing carbon fibers
AssigneeTakemoto Yushi Kabushiki Kaisha
InventorsKohei Oda, Hiroki Honda
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Abstract
The present invention addresses the problem of suitably improving a treatment agent for a carbon fiber precursor in terms of the heat resistance and the effect of suppressing fusion between fibers during the step of flame-resisting treatment. This treatment agent for a carbon fiber precursor is characterized by containing a lubricant, the lubricant comprising a specific sulfur-containing diester compound and a specific sulfur-containing monoester compound.
Claims12
A carbon fiber precursor treatment agent comprising
- a lubricant, wherein the lubricant contains a modified silicone having a modified group that includes a nitrogen atom, a sulfur-containing diester compound represented by Formula I shown below:
- R1—OOC—(CH2)a—S—(CH2)b—COO—R2 [1]
- wherein a and b are each an integer from 1 to 10, and R1 and R2 are each a residue obtained by removing a hydroxy group from a saturated alcohol with 17 to 32 carbon atoms or a residue obtained by removing a hydroxy group from an alkylene oxide adduct of a saturated alcohol with 17 to 32 carbon atoms, and
- a sulfur-containing monoester compound represented by Formula 2 Formula II shown below:
- R1—OOC—(CH2)a—S—(CH2)b—COO—R2 [2]
- wherein c and d are each an integer from 1 to 10, and R3 is a residue obtained by removing a hydroxy group from a saturated alcohol with 17 to 32 carbon atoms or a residue obtained by removing a hydroxy group from an alkylene oxide adduct of a saturated alcohol with 17 to 32 carbon atoms.
3 more elements
Dependencies are inferred from the claim text.