Teijin Aramid B.v.

Teijin Limited

Teijin Techno Products Limited

Dennis Wilbers

Hanneke Boerstoel

Johannes Bos

Adriaan Anton Schaap

Antonius Henricus Maria Schotman

Kurt Rainer Hans-Heinrich Stolze

Hiroaki Kuwahara

Masayuki Chokai

Mirjam Ellen Oldenzeel

Anton Johannes Josef Hendriks

René Journee

Hendrik Van De Hee

Leonardus Antonius Godfried Busscher

Harrie Grotendorst

Anton Peter De Weijer

Leonardus Antonuis Godfried Busscher

Ruben Calis

A process for manufacturing a ballistic resistant article including steps: a) stacking a stretchable lamina of ultra-high molecular weight polyethylene (UHMWPE) and a stretchable continuous film of a polymer as organic matrix material to form a lamina-film stack, the continuous film not being an UHMWPE film; b) elongating the stack at a temperature below the melting point of the lamina, to an elongation ratio of at least 2, thereby providing a UHMWPE film with an organic matrix material in which the UHMWPE film is co-stretched with the film of polymer as organic matrix material; c) aligning a plurality of films to form a layer of films; d) stacking at least two layers of films to form a sheet; e) stacking a plurality of sheets to form a stack of sheets, and consolidating the sheets prior to and/or after step e) by applying pressure and optionally heat. Also, a ballistic-resistant article.

Ballistic-resistant article based on films provided with matrix

A process for rolling and stretching of a sheet into a tape is provided. A sheet may be rolled into a rolled sheet in the nip between two rolls of the calender and the rolled sheet is stretched immediately thereafter into a tape on the surface of one of the two calender rolls. The speed of the rolled sheet on the surface of the calender roll may be higher than the speed of the calender roll. The position of the start of the neck-down of the rolled sheet and the rate of neck-down can be easily controlled by the proposed process.

Process for combined rolling and stretching of tapes

A para-aramid fibrid film is disclosed that has at least 95% of the bonds of the polymer are para-oriented. A method for making said para-aramid fibrid film by (a) polymerizing a para-oriented aromatic diamine and a para-oriented aromatic dicarboxylic acid halide to an aramid polymer having only para-oriented bonds in a mixture of solvents consisting of N-methylpyrrolidone or dimethylacetamide and calcium chloride or lithium chloride to obtain a dope wherein the polymer is dissolved in the mixture of solvents and the polymer concentration is 2 to 6 wt. %, and (b) converting the dope to para-aramid fibrid film is also described.

Para-aramid fibrid film

The invention relates to a method for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising DAPBI, an aromatic para-diamine, and an aromatic para-diacid, wherein the yarn is heated in at least two process steps, characterized in that in a first step the yarn is heated at a temperature of 200 to 360&#xb0; C. at a tension of at least 0.2 cN/dtex, followed by a second step wherein the yarn is heated at a temperature of 370 to 500&#xb0; C. at a tension of less than 1 cN/dtex. The invention further pertains to a multifilament aramid yarn spun from a sulfuric acid spin dope and having a tenacity of at least 2500 mN/tex.

Method for obtaining high-tenacity aramid yarn

This invention is to provide a dope that has excellent formability and can be formed into a fiber, a film, pulp-shaped particles and the like by a wet method. This invention is also to provide a process for the production of a fiber excellent in heat resistance, strength and elastic modulus. This invention provides a dope and a process for the production of a fiber from the dope, the dope including a polyamide and a basic solvent, the polyamide containing a recurring unit of the following formula (I), wherein Arrepresents at least one substituent selected from the group consisting of and having an inherent viscosity of 1.0 or more, the dope has a polyamide concentration of over 10% by weight but not more than 25% by weight and exhibits optical anisotropy at 50&#xb0; C.

Dope and process for the production of fiber from the dope

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Arnhem, Netherlands

Dennis Wilbers