E.i. Dupont De Nemours and Company

Anthony Anton

William P. Parmelee

Diane M. Scholler

Linda H. Sauerbrunn

Paul S. Pearlman

William T. Windley

Peter R. Witt

William T Windley

Paul S Pearlman

Peter R Witt

William Paul Parmelee

Diane Marie Scholler

Linda Hoeflich Sauerbrunn

Henry Kobsa

Lilburn Lafayette Norton

Lester P Stagg, Jr

William P Parmelee

Diane M Scholler

Linda H Sauerbrunn

Producer-colored nylon fibers which are stain-resistant to acid dyes are made by adding pigment to nylon copolymers containing 0.25-4.0 percent by weight of an aromatic sulfonate or an alkali metal salt thereof. In addition process advantages relating to the use of the same copolymers in making pigmented nylon fibers are also disclosed.

Stain-resistant, pigmented nylon fibers

Shaped articles, such as fibers, formed of a polyamide formed by salt-blending the polyamide precursor salt with a cationic dye modifier, such as the dimethyl ester of 5-sulfoisophthalic acid, followed by polymerization, are rendered resistant to staining by acid dyes at ambient conditions either by adding an acid dye to the polymer melt or by dyeing with an acid dye from an acid dyebath at pH 2 to 7 and 60.degree. to 100.degree. C. so that the shaped article contains from at least 0.0048 and preferably at least 0.0096 wt % of an acid dyestuff. In a preferred aspect of the invention, the shaped articles are oriented, crimped, heat-set fibers for use as the facing in carpets.

Dyed antistain nylon with cationic dye modifier

Bulked random copolyamide yarns having enhanced dyeability as compared to comparable nylon 6 fibers are disclosed. The random copolyamides contain from 80 to 96% by weight of nylon 6 units and 4 to 20% by weight of nylon 6,6 units with from 90 to 94% nylon 6 and 6 to 10% nylon 6,6 being the preferred range. Further increases in dyeability are obtained by steam heat-setting the yarns.

Bulked random copolyamide yarns of nylon 6 and nylon 6,6 having enhanced

A fiber having a reduced dye rate compared to nylon 6 formed from a block copolymer of 2-30 wt % nylon 6,6 and 70-98 wt % nylon 6 which fiber has a stain resist applied thereto.

Dye-retarded nylon 6/6,6 block copolymer fibers

Blends of nylon 6,6, nylon 6 or nylon 6,6/6 copolymer which contain a randomly copolymerized cationic dye modifier are formed by melt blending such copolymer with a polyamide, having 8 to 22 carbon atoms per amide link to form a block copolymer composition which is resistant to staining with acid dyes under ambient temperature and pH conditions.

Carpets and fabrics of antistain block copolymer compositions of

High twist fibers are produced in a spin/quench/twist process directly from a modified spinneret. The spinneret consists of capillaries that are installed in highly elongated inserts which are surrounded by heat deflecting shields surrounded by an annular concentric orifice supplied with a fluid (air or steam preferred) that simultaneously quenches and twists the emerging filaments as they exit the capillary quench/torque jet.

Spinneret

Blends of nylon 6,6, nylon 6 or nylon 6,6/6 copolymer which contain a randomly copolymerized cationic dye modifier are formed by melt blending such copolymer with a polyamide having 8 to 22 carbon atoms per amide link to form a block copolymer composition which is resistant to staining with acid dyes under ambient temperature and pH conditions.

Antistain block copolymer compositions of modified nylon copolymers and

Process for producing producer-colored nylon fibers which are stain-resistant to acid dyes are made by adding pigment to nylon copolymers containing 0.25-4.0 percent by weight of an aromatic sulfonate or an alkali metal salt thereof.

Process for producing stain-resistant, pigmented nylon fibers

A process for preparing a nylon 66/6 copolymer fiber with reduced spherulites comprising adding 1-6% caprolactam and 0.001-2% water-soluble inorganic calcium salt to 94-99% nylon 66 salt to form a nylon 66/6 salt solution, polymerizing the salt solution to form a polymer, and extruding the polymer.

Process for preparing a nylon fiber with reduced spherulites

A process for making a polyhexamethylene adipamide fiber with a spherulite rating of 1 in which a molten polymer of polyhexamethylene adipamide is injected with fluorocarbon and subjected to low shear.

Process for obtaining spherulite reduction in polyamides

A crimped fiber having a plurality of cells and bends characterized by the total area occupied by the cells within a cross-section of the fiber at the bends being less than 50% of the area occupied by the cells within a cross-section of the fiber at other than the bends.

Cellular fiber with collapsed cells at bends

A room temperature dyeable polyamide fiber with low spherulites containing 1-6% nylon 6, 94-99% nylon 66 and 0.001-2% of a highly reactive metal, preferably calcium and the process for making the fiber are disclosed.

Nylon containing metal salts

A fiber having 1/2-50% substantially gas-filled and essentially all closed cells having a diameter of 0.2-25 microns and a length to diameter ratio of greater than 500 is disclosed. The fiber is made by mixing a fluorocarbon blowing agent into molten polymer, shearing the polymer at a high shear rate, extruding the polymer in a spinneret capillary at a low jet velocity and a low capillary entrance pressure and drawing down the polymer at a total extension greater than 1000.

Cellular fibers via soluble fluid injection

A method of providing automatic positional control spinning pump throughput on a multiposition spinning machine during periods of yarn interruption by sensing yarn breaks and reducing spinning pump speed by a predetermined amount.

Growing community of inventors

Seaford, DE, United States of America

William T Windley