[Designation of Document] Specification
[Title of the Invention] Meta-Type Wholly Aromatic Polyamide
Fiber
[Technical Field]
[OOOl]
The present invention relates to a meta-type wholly
aromatic polyamide fiber. More specifically, the present
inventionrelatestoanovelmeta-typewhollyaromaticpolyamide
fiber which contains no layered clay mineral, is excellent in
10 mechanical characteristics and can provide a high-quality
product.
[Background Art]
[0002]
It has been well known that wholly aromatic polyamides
15 produced fromaromatic diamines and aromatic dicarboxylic acid
dichlorides are excellent in heat resistance and excellent in
flame retardancy. Further, it has also been known that these
whollyaromaticpolyamidesaresolubleinamide-basedsolvents,
and fibers can be obtained from these polymer solutions by
20 methodssuchasdryspinning,wetspinningandsemi-drysemi-wet
spinning.
Of such wholly aromatic polyamides, a meta-type wholly
aromatic polyamide fiber (hereinafter abbreviated as
"meta-aramid" in some cases) represented by poly-m-phenylene
25 isophthalamide is particularly useful as a heat resistant and

Claims
[Claim 1]
A meta-type wholly aromatic polyamide fiber containing
substantially no layered clay mineral, in which the amount of
solvent remaining in the fiber is 1.0% by mass or less based
on th'e whole fiber, and the breaking strength of the fiber is
from 4.5 to 6.0 cN/dtex.
[Claim 2]
The meta-type wholly aromatic polyamide fiber according
to claim 1, wherein it has a dry heat shrinkage percentage at
300°C of 5.0% or less.
[Claim 3]
The meta-type wholly aromatic polyamide fiber according
to claim 1 or 2, wherein it has an initial elastic modulus of
800 to 1,500 cN/mm^.
Dated this the 7*^ day of September 2012. H^y^^^^j
(MOUTUSfflf BHOWMIK)
O/SUBRAMANIAM, NATARAJ 8s ASSOCIATES
Attorneys for the Applicants
42