Patent ID: 7395654

Claim:
A reinforcing composite yarn consisting essentially of a substantially non-twisted composite yarn comprising at least one substantially non-twisted multifilament yarn comprising a plurality of continuous filaments and paralleled with at least one substantially non-twisted staple fiber yarn comprising a plurality of staple fibers, wherein the continuous filaments in the multifilaments yarn are selected from poly-paraphenylene terephthalamide filaments, copolyparaphenylene-3,4′- oxydiphenyleneterephthalamide filaments, polyparaphenylene benzooxazole filaments, high strength polyethylene filaments, high strength polyvinyl alcohol filaments, wholly aromatic polyester filaments and carbon filaments; the multifilament yam exhibits a tensile strength of 13 cN/dtex or more and an initial modulus of 300 cN/dtex or more; the staple fibers in the staple fiber yarn are selected from nylon 6 staple fibers, nylon 66 staple fibers, meta-aromatic polyamide staple fibers, and para-aromatic polyamide staple fibers; the staple fiber yarn comprises a staple fiber fraction having a fiber length of 1.5 times or more the average fiber length of the staple fiber yarn and another staple fiber fraction having a fiber length of 0.5 times or less the average fiber length of the staple fiber yarn, each in a content of at least 15% by mass; and a portion of the staple fibers in the staple fiber yarn is present in the form of winding around the periphery of the paralleled composite yarns, to thereby bind the multifilament yarn with the staple fiber yarns into a composite yarn.