Abstract: According to the present invention there is provided a wet wipe comprising a substrate that has tensile strength of at least 5 N/inch and which is biodegradable. In a further aspect, the present invention provides a flushable wet wipe comprising a substrate having a loading factor of at least 1.5 grams of cleaning composition per gram of substrate and which is biodegradable. The wet wipes is suitable for cleaning hard surfaces, especially lavatories and is flushable.

Abstract: An acrylic multifilamentary material possessing an internal structure which is well suited for thermal conversion to high strength carbon fibers is formed via a specifically defined combination of processing conditions. The acrylic polymer while in substantially homogeneous admixture with appropriate concentrations (as defined) of C.sub.1 to C.sub.2 nitroalkane and water is melt extruded and is drawn at a relatively low draw ratio which is substantially less than the maximum draw ratio achievable. During the melt extrusion a C.sub.1 to C.sub.4 monohydroxy alkanol preferably also is present in the substantially homogenous admixture. The fibrous material which is capable of readily undergoing drawing next is passed through a heat treatment zone wherein the evolution of residual nitroalkane, monohydroxy alkanol and water takes place.

Abstract: A structure and a method of producing such structure which includes a fiber reinforced composite article in which the surface of the article will generate a visible indication thereon upon impact of the surface by another object. The method comprises laying up multiple layers of a first material into the shape of the desired composite article. A relatively thin layer of a second filamentary material is then layed up on and bonded to the surface of the base structure formed by the layers of the first material. The second filamentary material forms a thin outer layer on the composite article, and upon impact of the outer layer with another object, the outer layer delaminates and forms a discoloration in the form of a whitened patch or spot in the immediate vicinity of the impact. The articles so produced can be visually inspected for damage, and only those articles showing a surface discoloration need be subjected to nondestructive testing.

Abstract: Core sandwich structure comprised of a lightweight core material in the form of a low density thermosetting resin matrix composition containing glass microballoons, particularly an epoxy resin containing glass microballoons, sandwiched between high strength fiber-thermosetting resin matrix outer sheets, particularly woven graphite-epoxy sheets. Employing epoxy resin as the preferred thermosetting resin, the epoxy core material is B-staged, placed between sheets of pre-preg woven graphite-epoxy material, and the assembly co-cured under pressure to form the core sandwich structure.