C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 77/10 (2006.01) C08J 3/09 (2006.01) D01D 5/06 (2006.01) D01F 6/60 (2006.01) D21H 13/26 (2006.01)
Patent
CA 2097037
A para-aramid dope of low degree of polymerization exhibiting an optical anisotropy containing 4-10% by weight of a pares-aramid having an inherent viscosity of 1.0-2.5 dl/g and 2-10% by weight of an alkali metal chloride or an alkaline earth metal chloride in a pedlar amide solvent; a para-aramid fiber obtained by spinning the above-mentioned para-aramid dope of low degree of polymerization; a para-aramid pulp obtained by cutting the above-mentioned para-aramid fiber into a short fiber, mechanically fibrillating the short fiber with a high shearing force and thereafter drying the fibrillated short fiber; a process for producing a para-aramid fiber which comprises adding 0.94-0.99 mole of a para-oriented aromatic dicarboxylic acid halide to 1.00 mole of a pares-oriented aromatic diamine in a polar amide solvent in which 2-10% by weight of an alkali metal chloride or an alkaline earth metal chloride is dissloved, carrying out a polymerization at a temperature of -20°C to 50°C to form a para-aramid dope of low degree of polymerization exhibiting an optical anisotropy and having a para-aramid concentration of 4-10% by weight, and spinning the dope; and a process for producing a para-aramid pulp which comprises cutting the above-mentioned para-aramid fiber into a short fiber, mechanically fibrillating the short fiber with a high shearing force, and thereafter drying the fibrillated short fiber.
Sato Hiroyuki
Takahashi Tsutomu
Akzo N.v.
Fetherstonhaugh & Co.
Sumitomo Chemical Co. Ltd.
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