US 7,604,859 B2 · Heat adhesive biodegradable bicomponent fibers

Abstract

The present invention discloses a heat adhesive biodegradable bicomponent fiber comprising a polylactic-acid-based low melting component and a high melting component, wherein the low melting component constitutes the sheath of the fiber, and the high melting component constitutes the core of the fiber. The material of the low melting component comprises unmodified polylactic acid or a blending with unmodified polylactic acid and modified polylactic acid. The modified polylactic acid is modified by blending unsaturated dicarboxylic acid, unsaturated anhydride or their derivatives with polylactic acid. The bicomponent fiber provided in this invention is biodegradable, environmentally benign and with excellent bonding performance to polylactic acid fibers, chemical fibers and cellulose fibers.

Claims16

Dependent claims

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.

3 more elements

Dependencies are inferred from the claim text.

Heat adhesive biodegradable bicomponent fibers

Life of this patent

Heat adhesive biodegradable bicomponent fibers

Life of this patent

Abstract

Claims16