Process for the continuous production of aromatic polyamides in

Details Process for the continuous production of aromatic polyamides in Process for the continuous production of aromatic polyamides in

1978-04-18

1981-10-27

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528312, 528319, 528331, 528335, 528338, 528339, 528347, 528348, C08G 6928

Patent

active

042974798

ABSTRACT:
A continuous process is disclosed for the production of poly-(para-phenylene terephthalamide) and its copolymers, having an inherent viscosity of at least 3. Molten terephthaloyl chloride, and optionally adipoyl chloride, are reacted in stoichiometric amounts with a solution of para-phenylenediamine and/or of 4,4'-diaminoadipanilide, and optionally of a prepolymer formed from at least one chloride and at least one diamine from amongst those mentioned above, in a mixture of N-methylpyrrolidone-2 and calcium chloride which is homogeneous and substantially anhydrous, with a molar ratio of CaCl.sub.2 /unit: ##STR1## of at least 1, and preferably at least 1.15, and under conditions such that the final composition contains at least 5% by weight of polymer, relative to the N-methylpyrrolidone-2, where R represents p-phenylene or p-phenylene and up to 50% of n-butylene of the total polymer units. The polymer obtained may be converted into films, fibers and high-performance yarns for reinforcing composite materials or articles made of rubber.

REFERENCES:
patent: 3671542 (1972-06-01), Kwolek
patent: 3850888 (1974-11-01), Fitzgerald et al.
patent: 3966686 (1976-06-01), Asakura et al.
patent: 4075172 (1978-02-01), Ozawa
patent: 4172938 (1979-10-01), Mera et al.
Fiber Forming Aromatic Polyamides, Man Made Fibers, Black et al., vol. 2, (1968), p. 301.
Polymer Science (USSR), 12, #10-12 (1970), pp. 2475-2491, Federov et al.
Polymery, (1971), 16 (11), pp. 514-515, Chodkowski et al.

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