Abstract: A process for making a high-strength spun yarn begins by feeding one or more tows of substantially uncrimped continuous filaments of high-modulus material having a tensile modulus exceeding about 20×106 psi through a high-speed stretch-breaking apparatus operating at low total draft ratio (preferably about 2.0) to break the filaments into high-modulus staple fibers having an average length in the range of about 5 to 6 inches. The tows advantageously are heavy, for example, having a denier of about 25,000 to about 500,000. Following the stretch-breaking step, the staple fibers are collected in sliver cans, and the staple fibers are advanced from the sliver cans to a spinning machine, where the fibers are spun into yarn. An important aspect of the invention is that no intermediate processes are performed between the stretch-breaking and spinning processes, which minimizes disruption of the alignment of and damage to the staple fibers.

Abstract: A film having a width of at least about one foot as defined by the cross machine direction thereof and a substantially uniform average thickness of less than about 10 mils is formed of a crosslinkable thermoplastic olefin polymer, a crosslinking agent, and preferably a flame retardant. The film can be combined with a suitable substrate to form a prepreg or coated substrate, and the prepreg or coated substrate can be subsequently treated under conditions to crosslink the olefin polymer and to form a rigid composite structure. The composite structure is particularly useful for printed circuit board applications.

Abstract: Tint compositions for nylon having improved fugitivity properties comprising an admixture of a colorant having the general formulaR{N-[(CH.sub.2 CH.sub.2 O).sub.n H].sub.2 }.sub.xwherein R is an organic dyestuff radical, x is an integer of 1 to 6, and the product of 2n times x is from about 200 to about 300, and at least 30 weight percent of a water-soluble polymeric resin. A minor effective amount of a free radical inhibitor can be incorporated into the tint compositions to retard free radical interaction between the colorant and the nylon.