Resin composition for poly(3-hydroxyalkanoate) fiber, fiber, and method for producing the same

A method for producing a fiber by melt spinning, the method comprising:

• (A) discharging a molten product of a resin composition through a discharge hole, thereby obtaining a raw filament;
• (B) cooling the raw filament;
• and
• (C) drawing the cooled raw filament, thereby obtaining the fiber, wherein:
• the resin composition comprises a poly(3-hydroxyalkanoate) resin (A) having a weight-average molecular weight ranging from 200,000 to 700,000 and a poly(3-hydroxyalkanoate) resin (B) having a weight-average molecular weight ranging from 400,000 to 1,400,000;
• the weight-average molecular weight of the poly(3-hydroxyalkanoate) resin (B) is greater than the weight-average molecular weight of the poly(3-hydroxyalkanoate) resin (A) by at least 200,000;
• and
• a content of the poly(3-hydroxyalkanoate) resin (A) is greater than a content of the poly(3-hydroxyalkanoate) resin (B).