Sheath-core cospun heather yarns
AssigneeE. I. Du Pont de Nemours and Company
InventorLin-Fa Lee
Life of this patent
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Abstract
A composite yarn exhibiting heather dyeing capability is comprised of two groups of filaments composed of two differently dyeable polymers wherein filaments of one group are homofilaments of one polymer and filaments of the other group are of a substantially concentric sheath core structure with the sheath being of the other polymer and the core being of the same polymer as the homofilaments. The yarn dyes to give a heather appearance which is different from the appearance expected based on the polymer composition of the yarn.
Claims16
A yarn exhibiting differential dyeing capability comprising at least two groups of filaments which are composed of two different thermoplastic, melt-spinnable, fiber-forming polymer compositions selected from the group consisting of polyamides and polyesters, said polymer compositions having substantially different receptivities for a first class of dyes and a common receptivity for a second class of dyes wherein a first group of filaments consists essentially of homofilaments of one of said polymer compositions and a second group of filaments are of a substantially concentric, sheath-core structure, the sheath being composed of the other of said two polymer compositions and the core being of the same polymer composition as said homofilaments.
A yarn exhibiting differential dyeing capability consisting essentially of two groups of filaments which are comprised of two different thermoplastic, melt-spinnable, fiber-forming polymers selected from the group consisting of poly(ethylene terephthalate) and poly[ethylene terephthalate/5-(sodium-sulfo)isophthalate], said polymer compositions having substantially different receptivities for a first class of dyes and a common receptivity for a second class of dyes, wherein a first group of filaments consists of homofilaments of one of said polymers and the second group of filaments consists of substantially concentric, sheath-core filaments, the sheath being comprised of the other of said two polymers and the core being comprised of the same polymer as the homofilaments.
Dependencies are inferred from the claim text.