C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
18/1213, 402/223
C08G 69/04 (2006.01) C08G 69/12 (2006.01) C08G 69/32 (2006.01) C08G 69/36 (2006.01)
Patent
CA 1104296
ABSTRACT OF THE DISCLOSURE: An aromatic polyamide having a high degree of poly- merization is produced by polymerizing (A) a mixture of an aromatic diamine of the formula H2N - Ar1 - NH2 ... (1): and an aromatic dicarboxylic acid dihalide of the formula (2): XOC - Ar2 - COX ... (2), (B) a mixture of the aromatic diamine of the formula (1), the aromatic dicarboxylic acid dihalide of the formula (2) and a hydrogen halide salt of an aromatic amino carboxylic acid halide of the formula (3): XH H2N - Ar3 - COX ... (3), or (C) the hydrogen halide salt of the aromatic amino carboxylic acid halide of the formula (3) alone, wherein Ar1, Ar2 and Ar3 respectively represent, independently from each other, a divalent aromatic or heteroaromatic radical having two bonds extending from the radical essen- tially coaxially or in parallel to each other or a divalent heteroaromatic or heterocyclic radical having two bonds ex- tending from the radical with a maximum spacing from each other, and X represents a halogen atom, to a condensation polymerization in a medium of at least one solvent selected from N-methyl-2-pyrrolidone containing 1.5% or more but less than 5% by weight of calcium chloride, and dimethyl acetamide, N-methylcaprolactam and tetramethylurea respectively containing 1.5 to 8% by weight of the calcium chloride. - 1 -
280274
Mera Hiroshi
Nakagawa Yasuo
Ohno Mitsuyuki
Yamaguchi Masahiro
Mcfadden Fincham
Teijin Limited
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