Patent ID: 7604859

Claim:
A heat adhesive biodegradable bicomponent fiber, comprising: a polylactic-acid-based low melting component comprising D-lactic acid, L-lactic acid and additive, and constituting the sheath of the fiber; and a polylactic-acid-based high melting component comprising D-lactic acid, L-lactic acid and additive, and constituting the core of the fiber; wherein the difference between the melting point of said low melting component and that of said high melting component is at least 10° C.; the ratio of said D-lactic acid to said L-lactic acid and additive by weight for said high melting component is from 0.5:99.5 to 4:96; and the ratio of said D-lactic acid to said L-lactic acid and additive by weight for said low melting component is from 3.5:96.5 to 10:90.