Teijinconex

Following the technological breakthroughs which led to the discovery of (1) the liquid crystalline behavior ofpara-oriented aramids26 and (2) a novel method for spinning anisotropic liquid crystalline polymer solutions,27 Kevlar aramid fiber was produced and commercialized by the DuPont company in 1972. Other fibers based on aromatic polyamide compositions, which were produced and commercialized by other companies, were Technora (Teijin, Japan), Teijinconex (Teijin, Japan), andTwaron (Akzo, The Netherlands). Additionally, SVM is a fiber produced in the Former Soviet Union and it was announced in 1990 that a new aramid fiber had been introduced by Hoechst, in Germany. 

TRADE NAMES Nomex, Teijinconex, Fenilin CLASS Aromatic polyamides STRUCTURE Q O... 

PRODUCERS AND/OR SUPPUERS Du Pont (Nomex) Teijin Ltd., Japan (Teijinconex) Russia (FenUin)... 

Nomex—a registered trademark of E.I. DuPont de Nemours Co., Inc., Wilmington, Delaware, USA. Teijinconex, Technora—registered trademarks of Teijin, Ltd., Japan. 

Source From DuPont Technical Guide for Kevlar Aramid Fiber, H-77848, 4/00 DuPont Technical Guide for Nomex Brand Aramid Fiber, H-52720, 7/01 Teijin Ltd., Teijinconex Heat Resistant Aramids Fiber 02.05 Teijin Ltd., High Tenacity Aramids Fibre Technora TIE-05/87.5 Akzo Nobel, Twaron—Product Information Yarns, Fibers and Pulp. 

Trade name Polymer Nomex MPDI Teijinconex MPDI Kevlar PPTA Twaron PPTA ... 

Teijin s product, trademarked Teijinconex, is a 100/97/3 copolymer of MPD/IQ/TCl [83]. The polymer is prepared by interfacial polymerization, isolated and dissolved in NMP to form spin dopes of approximately 20% solids concentration [86]. The resulting isotropic solutions are stable at 100°C and are suitable for wet spinning. The solution has two solubility limits that include reversible and irreversible regions, as shown in Figure 13.1 [87]. If the irreversible limit is exceeded, the polymer becomes soluble only in sulfuric acid. 

FIGURE 13.1 Stability of Teijinconex spin solution. (From Fujie, H., Nikkyo Geppo, 40, permission.)... 

A schematic of the Teijinconex wet-spinning process is shown in Figure 13.7 [87]. The process schematic for producing Fenilon is similar to that shown in Figure 13.7 with the exception that the polymer solution is spun directly from the polymerization process [104]. While the above processes require little or no inorganic salt content in the spinning solution, the process described by Tai et al. allows the use of salt-containing solutions [105]. 

Source From Magellan International Teijin Ltd., Teijinconex Heat Resistant Aramids Fiber 02.05. 

Poly( )-phenylene isophthalamide) (PMPI) Tradenames Nomex , Teijinconex . 

Wet Spinning MPDi. Aflow diagram for the wet spinning of MPDI to form Teijinconex is shown in Figure 4 (30). 

The basic development and the first commercial introduction of aramid materials were done by DuPont, which continues to be the largest producer. MPDI fiber products (staple, continuous filament, yarn, and floe) under the trademark Nomex are produced by DuPont in the United States and Spain. The only other major MPDI producer is Teijin, with its fiber product Teijinconex produced in Japan. The situation is very similar with the PPTA manufacturers. The first and largest manufacturer, DuPont, produces essentially all product forms except films. DuPont s PPTA fibers are known under the trademark Kevlar , p-Aramid fiber is also produced in Ireland and Japan. The other producer of PPTA is Teijin Co., which produces two basic fibers Twaron based on PPTA, and Technora based on the ODA-PPTA copolymer. A small amount of p-aramid fibers (Armos and Rusar ) are produced in Russia, both being based on SVM copolymer [6]. 

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