The present invention provides novel hybrid self-reinforced composites, combining an oriented brittle fibre and an oriented thermoplastic polymeric ductile fibre (as reinforcement phase) in the same thermoplastic polymeric matrix phase. The hybrid self-reinforced composites are strong and stiff, but in case of impact or crash they have high strain to failure and absorb a lot of energy. The present invention also relates to methods to produce said hybrid self-reinforced composites by a hot compaction technique.

Small diameter poly(phenylene ether) fibers can be consistently formed from a composition comprising specific amounts of a poly(phenylene ether), a processing aid, and optionally a poly(alkenyl aromatic). The processing aid can be LLDPE, a petroleum resin, or combinations thereof. The processing aid can optionally further comprise a phosphite or phosphonate. Flame retardants are minimized or excluded from the composition. The fibers can be melt spun without entanglement or breakage, and this improved processability enables small diameter fibers to be formed. The resulting fibers can be used in reinforcing structures for printed circuit boards.

The present invention is directed to a polyacetal stretched fiber of a polyacetal resin composition which contains a polyacetal resin and a fatty acid metal salt in an amount of 0.01 to 5 phr relative to the polyacetal resin, wherein the stretched fiber is obtained by stretching a fiber at a temperature of 100 C. or more to a temperature lower than the melting point of a polyacetal resin composition, and the fiber is obtained by melt spinning the polyacetal resin composition, and a fiber assembly comprising the stretched fiber as a main constituent.

A fiber-reinforced composite material for increasing adhesive strength between a first composite material layer including a fibrous substrate with reinforcement fiber bundles arranged crosswise, and a second composite material layer including second reinforcement fibers arranged randomly. The first composite material layer including a fibrous substrate having reinforcement fiber bundles crossing and being drawn and aligned first reinforcement fibers; and first thermoplastic resin, with at least each of the reinforcement fiber bundles is impregnated; and a second composite material layer including second reinforcement fibers arranged randomly in second thermoplastic resin. The first composite material layer and the second composite material layer bonded to each other. The first composite material layer has bores on at least a surface thereof that is to be bonded with the second composite material layer. The second reinforcement fibers and the second thermoplastic resin enter into the bores.

The present invention provides preparation of a yarn with coffee residue. The present invention also provides a novel yarn with coffee residue and applications of the same.