Patent ID: 7645508

Claim:
A combined-filament yarn comprising a multifilament component (A) and a conjugate multifilament component (B) which are combined together, characterized in that the multifilament component (A) comprises a plurality of filaments comprising a polyethylene terephthalate resin composition, the polyethylene terephthalate resin composition comprising polyethylene terephthalate polymer, with a metal-containing phosphorus compound (a) represented by the general formula (I): wherein R 1 and R 2 respectively and independently from each the represent a monovalent organic group, M represents an alkali metal atom or alkaline earth metal atom, and m represents an integer of 1 when M is an alkali metal atom and represents a numeric of ½ when M is an alkaline earth metal atom, and an alkaline earth metal compound (b), the metal-containing phosphorus compound (a) and alkaline earth metal compound (b) being mixed, during the production process for the polyethylene terephthalate polymer, into the reaction mixture, the conjugate multifilament component (B) comprises a plurality of polyester conjugate filaments having a side-by-side or eccentric core-sheath conjugate fiber structure formed from two mutually different polyester resins, wherein at least one of the two different polyester resins is polytrimethylene terephthalate resin, and the mass ratio ((A)/(B)) of the multifilament component (A) with respect to the conjugate multifilament component (B) is in the range of 80:20 to 50:50.