Title: Mixed cross-section staple filament mixtures and yarn therefrom

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Claims: I claim:

1. A crimped polyamide staple filament mixture comprising (a) 40-60% by weight of trilobal filaments having a modification ratio within the range of 1.6-1.9, and (b) 40-60% by weight of trilobal filaments having a modification ratio within the range of 2.2-2.5.

2. A crimped polyamide staple yarn having high bulk, high luster and improved resistance to soiling, comprising a blend of (a) 40-60% by weight of trilobal filaments having a modification ratio within the range of 1.6-1.9, and (b) 40-60% by weight of trilobal filaments having a modification ratio within the range of 2.2-2.5.

3. A crimped polyamide staple yarn in accordance with claim 2 which contains as part of the blend up to 5% of multilobal filaments having a modification ratio within the range of 1.4-2.8.

4. A crimped polyamide staple yarn in accordance with claim 2 which contains as part of the blend up to 5% of other filaments.

5. A crimped polyamide staple yarn in accordance with claim 2 containing 0-10% of a delusterant.

6. A crimped polyamide staple yarn in accordance with claim 5 wherein the delusterant is polyethylene oxide.

7. A crimped polyamide staple yarn in accordance with claim 6 wherein the delusterant is present in amounts within the range of 0.25-1%.

8. A method for producing the crimped polyamide staple filament mixture by mixing (a) 40-60% by weight of trilobal filaments having a modification ratio within the range of 1.6-1.9, and (b) 40-60% by weight of trilobal filaments having a modification ratio within the range of 2.2-2.5.

9. In a method for producing crimped polyamide staple yarn having high bulk, high luster and improved resistance to soiling by a combination of steps including meltspinning continuous polyamide filaments, drawing the filaments, crimping the filaments, cutting the crimped filaments into staple, wherein the improvement resides in blending filaments comprising (a) 40-60% by weight of trilobal filaments having a modification ratio within the range of 1.6-1.9, and (b) 40-60% by weight of trilobal filaments having a modification ratio within the range of 2.2-2.5, said blending being performed during one or more stages in the production of staple yarn.

10. A method in accordance with claim 9 wherein the blending is performed in the drawing stage.

11. A method in accordance with claim 9 wherein the blending is performed after cutting to staple.

12. A method in accordance with claim 9 wherein the steps include combining the trilobal filaments with up to 5% of other staple filaments.

Other info:

Inventors: Shah, Chandrakant S. (Seaford, DE, US)

Application Number: 560117
Filing Date: 1975-03-20
Publication_date: 1976-11-30
Assignee: E. I. DuPont de Nemours and Company (Wilmington, DE)
Primary Class(es): 57/253 57/2, 57/254, 57/298
Other Classes:
US Patent Ref:

2939202	Jun, 1960	Holland	57/140.
3033240	May, 1962	Bottorf	57/34.
3097416	Jul, 1963	McKinney	57/140.
3220173	Nov, 1965	Pitzl	57/140.
3249669	May, 1966	Jamieson	57/140.
3802177	Apr, 1974	Sekiguchi	57/140.

Other Refs:
Primary Examiner: Watkins, Donald E.
Assistant Examiner:
Attorney: