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US 6,673,442 B2Granted
Multilobal polymer filaments and articles produced therefrom
AssigneeE.I. du Pont de Nemours and Company
InventorsStephen B. Johnson, H. Vaughn Samuelson
Life of this patent
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Abstract
This invention provides polymer filaments having a multilobal cross-section. The cross-section can have a filament factor of about 2.0 or greater and a tip ratio of greater than about 0.2. The filaments may be used as-spun as a spin-oriented feed yarn or as a direct use yarn. The multifilament yarns made from these filaments are useful to make articles with subdued luster and low glitter.
Claims12
A synthetic filament having a multilobal cross-section, a filament factor of about 2 or greater, wherein the filament factor is determined according to the following formula:
- FF=K1*(MR)A*(N)B*(1/(DPF)C*[K2*(N)D*(MR)E*1/(LAF)+K3*(AF)],
- wherein K1 is 0.0013158;
- K2 is 2.1;
- K3 is 0.45;
- A is 1.5;
- B is 2.7;
- C is 0.35;
- D is 1.4;
- E is 1.3;
- MR is R/r1, wherein R is the radius of a circle centered in the middle of the cross-section and circumscribed about the tips of the lobes, and r1 is the radius of a circle centered in the middle of the cross-section and inscribed within the cross-section about the connecting points of the lobes;
- N is the number of lobes in the cross-section;
- DPF is the denier per filament;
- LAF is (TR)*(DPF)*(MR)2, wherein TR is r2/R, wherein r2 is the average radius of a circle inscribed about the lobes, and R is as set forth above, and DPF and MR are as set forth above;
- and AF is 15 minus the lobe angle, wherein the lobe angle is the average angle of two tangent lines laid at the point of inflection of curvature on each side of the lobes of the filament cross-section, and an average tip ratio of about 0.2.
11 more elements
Dependencies are inferred from the claim text.