Teijin Limited

Akihiro Aoki

Keizo Shimada

Hiroshi Mera

Noriaki Sasaki

Yorikazu Tamura

Tsutomu Nakamura

Toru Sawaki

Hideharu Sasaki

Shoji Makino

Hiroshi Fujie

Shuji Ozawa

Michio Yamamoto

Shozaburo Hiratsuka

Norihisa Yamaguchi

A cake of synthetic fibrid, which is formed by pressing to hydroextract a slurry of synthetic fibrid, pulverizing the compression product, and compressing the pulverization product again to solidity it in the form of a plate-like cake.

Cake of synthetic fibrid

There is provided an aromatic polyamide composition, which comprises (a) a polyamide, the recurring structural units of which are substantially totally aromatic, (b) an organic amide solvent, and (c) one or more salts selected from chlorides and bromides of an alkali metal, an alkaline earth metal or ammonium. The amounts of the polyamide and the organic amide solvent are in the ranges of 30 to 50% and 70 to 50% by weight, respectively, based on the total weight of the polyamide and the organic amide solvent. The amount of the salt is defined by the formulae:

Aromatic polyamide composition and processes for preparing film and

In a process for producing heat-treated wholly aromatic polyamide filaments comprising at least one wholly aromatic polyamide having recurring units of the formula (I): ##STR1## and at least one type of recurring units selected from those of the formula (II): ##STR2## where Ar represents a divalent aromatic radical selected from those of the formulae (III) and (IV): ##STR3## and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 respectively represent independently from each other, a substituent selected from the group consisting of halogen atoms and alkyl radicals having 1 to 2 carbon atoms, and l, m, n, p, q, r, and s respectively represent, independently from each other, zero or an integer of 1 to 2, the sum of the recurring units of the formulae (I) and (II) corresponding to at least 80 molar % of the overall recurring units in the wholly aromatic polyamide, undesirable adhesion of individual filaments to each other is satisfactorily prevented by adhering fine particles of an inert inorganic material which consists essentially of at least one member selected from the group consisting of graphite, talc, colloidal silica, hydrophobic silica, and mica, and optionally, of hydrated aluminum silicate, to peripheral surfaces of the individual non-heat treated filaments and thereafter, by heat treating under tension or drawing the filaments.

Process for producing wholly aromatic polyamide filaments heat-treated

High modulus shaped articles such as fibers and films, composed of a wholly aromatic copolyamide, are provided. The wholly aromatic copolyamide is comprised of recurring units of the formulae:

Wholly aromatic halogenated polyamide fiber and film

An aromatic copolyamide comprising recurring units (A) of the formula (I), (B) of the formula (II) and (C) of the formula (III): ##STR1## wherein in (I), (II) and (III), Ar.sub.1 is phenylene, naphthylene or biphenylene radicals, each having two valence bonds oriented meta; Ar.sub.2 is phenylene, naphthylene or biphenylene radicals, each having two valence bonds oriented coaxially or in parallel to each other and radicals of the formula (IV): ##STR2## wherein Y.sub.1 and Y.sub.2 are independently ##STR3## and; X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 respectively are independently --NH-- and --CO-- radicals, connected to each other to form an amide bond (--NHCO-- or --CHNH--), and the molar proportions of said recurring units (A), (B), and (C) fall within a quadrilateral defined by the co-ordinates P, Q, R and S or on a twice-turned line defined by the co-ordinates Q, R, S and P:

Aromatic copolyamide containing 3,4'-diphenylene moiety

An aromatic and/or heterocyclic polyamide-amide type polar solvent composition is prepared by prepolymerizing an aromatic or heterocyclic diamine with an aromatic or heterocyclic or heterocyclic dicarboxylic acid chloride in a smaller molar equivalent than that of the diamine to prepare a prepolymer solution having a solution viscosity of 20 poise or less; by removing a by-product, hydrochloric acid, from the resultant prepolymer solution by neutralizing it with ammonia to such an extent that the pH of a mixture of 10 g of the neutralized mixture with 200 ml of water becomes 3.7 to 8.0; by high polymerizing the prepolymer with an additional amount of aromatic or heterocyclic dicarboxylic acid chloride, and; finally, by converting the entire amount of hydrochloric acid and 10 to 70% NH.sub.4 Cl in the resultant polyamide solution into an amide type polar solvent-soluble salt, with a neutralizing agent, the amount of the salt being in a range of from 5 to 95% by weight of the theoretical amount of the salt to be derived from the entire amount of the dicarboxylic acid chloride.

Process for preparing a cyclic amide polar solvent composition

An aromatic copolyamide comprising recurring units (A) of the formula (I), (B) of the formula (II) and (C) of the formula (III): ##STR1## wherein in (I), (II) and (III) Ar.sub.1 is phenylene, naphthylene or biphenylene radicals, each having two valence bonds oriented meta; Ar.sub.2 is phenylene, naphthylene or biphenylene radicals, each having two valence bonds oriented coaxially or in parallel to each other and radicals of the formula (IV): ##STR2## wherein Y.sub.1 and Y.sub.2 are independently; ##STR3## and; X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 respectively are independently --NH-- and --CO-- radicals, connected to each other to form an amide bond (--NHCO-- or --CHNH--), and the molar proportions of said recurring units (A), (B) and (C) fall within a quadrilateral defined by the co-ordinates P, Q, R and S or on a twice-turned line defined by the co-ordinates Q,R,S, and P:

Aromatic copolyamide containing 3,4'-diamino diphenylene moiety

A wholly aromatic polyamide shaped article is prepared by a process wherein a solution of a wholly aromatic polyamide is extruded through an orifice and introduced into a first coagulating bath comprising an aqueous coagulating liquid and, then, the coagulated extrudate is introduced into a second coagulating bath comprising an aqueous solution of an inorganic salt.

Process for preparing wholly aromatic polyamide shaped articles

Aromatic polyamide film, having an excellent thermal resistance and a high dielectric breakdown strength, which comprises an aromatic polyamide containing repeating units of the formula

Crosslinked aromatic polyamide film and process for producing the same

An aromatic polyamide composition usable for producing shaped articles, for instance, filaments, comprises the components of an aromatic polyamide resin (P), a polar amide solvent (S) and an auxiliary solvent (H) consisting of a halogenated hydrocarbon, for example, dichloromethane and dichloroethane, the proportions of the components (P), (S) and (H) being on or within a quadrilateral A C D E defined by the co-ordinates:

Aromatic polyamide composition having polar amide and halogenated

A method of preparing a homogeneous solution of a polymer whose recurring structural units are predominantly metaphenylene isophthalamide units, comprising:

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Iwakuni, Japan

Akihiro Aoki