Fabrication of ballistic resistant fibrous composites having improved ballistic resistance properties. More particularly, ballistic resistant fibrous composites having enhanced flexural properties, which correlates to low composite backface signature. The composites are useful for the production of hard armor articles, including helmet armor.

The eyewear material is an eyewear material containing thermoplastic polyurethane. The eyewear material has a tan δ peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.

The present invention relates to production method of a composite material wherein the composite material is tensioned and cured to produce a composite material with a single cord or cord fabric reinforced with another component, comprising the steps of adhering at least two layers of compound material, attaching the adhered compound materials inside a hollow frame, placing said frame into a pre-tensioning device, wrapping the cords around the frame with the desired pre-tension, removing the frame together with the compound material and the cords from the pre-tensioning device, placing at least one layer of compound material on the curing tray, placing the coated frame removed from the pre-tensioning device onto the compound material layers, placing at least one more layer of compound material on the coated frame, closing the lid over the curing tray, curing the material and cutting the composite material into strips.

A method of forming a porous sol gel, including a dried porous sol gel, is provided comprising forming a sol gel from a sol gel-forming composition comprising a silane solution and a catalyst solution; and non-supercritically drying the sol gel to provide a dried porous sol gel having no springback. The dried porous sol gel can include dried macroporous or mesoporous sol gels or dried hybrid aerogels. The materials may contain open or filled pores. Such materials are useful as thermal insulators.

A structural element that includes a central part formed of a fibrous material suspended in a thermoplastic matrix and at least one side part formed of a fibrous material suspended in a thermoplastic matrix and having at least one void therein. The central part and the at least one side part are bonded together while in a heated thermoplastic state to form a single, integral structure characterized by the absence of discontinuity across the bond plane of the structure.

Fibers, especially black, brown or gray fibers, comprising IR-transparent colorants. IR-transparent colorants may be di-, tri- or polychromatic dyes or pigments, especially perylene pigments. The fibers may comprise perylene pigments which comprise one of the isomers of the formula Ia or Ib ##STR00001##
in which the R.sup.1 and R.sup.2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C.sub.1-C.sub.12-alkyl, C.sub.1-C.sub.6-alkoxy, hydroxy and/or halogen, or a mixture of the two isomers. Useful fiber materials include plastics or glass. The fibers find use, among other uses, in heat management or for production of textiles or fabrics.

According to the invention there is provided a composite article including: a textile layer having a first and a second face, each of the first and second faces having a polymeric coating thereon; a first polymeric layer adhered to the polymeric coating on the first face of the textile layer; and a second polymeric layer adhered to the polymeric coating on the second face of the textile layer; in which the polymeric coatings on the first and second faces of the textile layer are each formed by polymerizing a polymeric precursor which includes a group of sub-formula (I) where R.sup.2 and R.sup.3 are independently selected from (CR.sup.7R.sup.8)n, or a group CR.sup.9R.sup.10, CR.sup.7R.sup.8CR.sup.9R.sup.10 or CR.sup.9R.sup.10CR.sup.7R.sup.8 where n is 0, 1 or 2, R.sup.7 and R.sup.8 are independently selected from hydrogen, halo or hydrocarbyl, and either One of R.sup.9 or R.sup.10 is hydrogen and the other is an electron withdrawing group, or R.sup.9 and R.sup.10 together form an electron withdrawing group, and R.sup.4 and R.sup.5 are independently selected from CH or CR.sup.11 where R.sup.11 is an electron withdrawing group, the dotted lines indicate the presence or absence of a bond, X.sup.1 is a group CX.sup.2X.sup.3 where the dotted line bond to which it is attached is absent and a group CX.sup.2 where the dotted line bond to which it is attached is present, Y.sup.1 is a group CY.sup.2Y.sup.3 where the dotted line bond to which it is attached is absent and a group CY.sup.2 where the dotted line bond to which it is attached is present, and X.sup.2, X.sup.3, Y.sup.2 and Y.sup.3 are independently selected from hydrogen, fluorine or other substituents, R.sup.1 is selected from hydrogen, halo, nitro, hydrocarbyl, optionally substituted or interposed with functional groups, or formula (II), and R.sup.13 is C(0) or S(0).sub.2.

The present invention provides an aircraft window including a polyurethane including a reaction product of components including (a) about 1 equivalent of at least one polyisocyanate; and (b) about 1 equivalent of 1,4-cyclohexane dimethanol based upon the about 1 equivalent of the at least one polyisocyanate, and other aircraft window compositions.

The invention relates to a process for making high-performance polyethylene multi-filament yarn comprising the steps of a) making a solution of ultra-high molar mass polyethylene in a solvent; b) spinning of the solution through a spinplate containing at least 5 spinholes into an air-gap to form fluid filaments, while applying a draw ratio DRfluid; c) cooling the fluid filaments to form solvent-containing gel filaments; d) removing at least partly the solvent from the filaments; and e) drawing the filaments in at least one step before, during and/or after said solvent removing, while applying a draw ratio DRsolid of at least 4, wherein in step b) each spinhole comprises a contraction zone of specific dimension and a downstream zone of diameter Dn and length Ln with Ln/Dn of from 0 to at most 25, to result in a draw ratio DRfluid=DRsp*DRag of at least 150, wherein DRsp is the draw ratio in the spinholes and DRag is the draw ratio in the air-gap, with DRsp being greater than 1 and DRag at least 1. The invention further relates to a high-performance polyethylene multifilament yarn, and to semi-finished or end-use products containing said yarn, especially to ropes and ballistic-resistant composites.

The present invention relates to a polyester fiber that can be applied to a fabric for an airbag, and particularly, to a polyester fiber having elongation of 0.5% or more at a stress of 1.0 g/d, elongation of 4.3% or more at a stress of 4.0 g/d, and elongation of 7.5% or more at a stress of 7.0 g/d, and an initial modulus of 40 to 100 g/d, a method of preparing the same, and a fabric for an airbag prepared therefrom. Since the polyester fiber of the present invention remarkably decreases stiffness and secures superior mechanical properties, it is possible to provide superior packing properties, dimensional stability, and gas barrier effect, and to protect occupants safely by minimizing the impact applied to the occupants, when it is used for the fabric for an airbag.