Basf Corporation

Honeywell International Inc.

Dean R Gadoury

Karen L Johnson

George M Kent

Theodore G Karageorgiou

Bobby J Bailey

Dominick A Burlone

Harry Y Hu

Ulrike Breiner

Matthew B Hoyt

Natacha Berthelon

Randy L Mumford

A modified polyamide polymer having a high amino end group content, with more than 30 percent of the amino end groups being secondary or tertiary amine, dramatically improves the dye bleed performance. The modified polyamide may be prepared by polymerization of polyamide-forming monomers in the presence of a carboxylic acid and a hindered piperidine derivative in amounts sufficient to achieve the high amino end group content.

Process for preparing wetfast polyamide fibers

Wetfast polyamide fiber with high amino end group content

Polyamide-6 articles exhibit dramatically improved dye bleed and perspiration performance characteristics, as well as reduced color change of fluorescent dyed polyamide-6. These improvements are achieved according to the present invention by modifying conventional dyeing and aftertreatment conditions. That is, conventional temperatures used for dyeing and the aftertreatment of polyamide-6 yarns are typically about 100&deg; C. and 77&deg; C., respectively. In contrast, the dyeing and aftertreatment procedures of this invention are carried out at about 80&deg; C. or lower, and about 5&deg; C. or lower, respectively. Bath ratios of between about 15:1 to about 20:1 are employed with the polyamide-6 article being retained in the bath sufficient to achieve about 75% dye uptake.

Dyed polyamide-6 articles having improved wetfastness properties and methods of making same

A process for improving the ultraviolet stability of aramid and aramid-blend fabrics by pigment printing or padding the fabrics. The pigment printing process comprises the steps of supplying an aramid textile fabric free of highly polar solvents and dye diffusion promoting agents; pigment printing the fabric by applying onto the fabric a print paste comprising pigment, binder, print paste thickener, and water, the print paste being substantially free of carriers; and drying, then curing the thus-treated fabric at a temperature and for a time sufficient to fix the pigment on the aramid fibers. The padding process comprises the steps of supplying an aramid textile fabric; padding the fabric by soaking in a padding liquor comprising pigment, binder, and water, the padding liquor being substantially free of carriers; and then passing the wet fabric through two rollers to remove excess padding liquor from the fabric; and drying, then curing the thus-treated fabric at a temperature and for a time sufficient to fix the pigment on the aramid fibers.

Ultraviolet stability of aramid and aramid-blend fabrics by pigment dyeing or printing

Fabrics made of melamine fibers are made more comfortable by submerging them for at least 20 minutes in a dyebath or mock dyebath that is at least 70&deg; C.

Comfort melamine fabrics and process for making them

Methods for the deep shade dyeing of melamine fiber-containing textile articles include bringing an undyed melamine fiber-containing textile article into contact with a dye bath containing a dyestuff and an acid donor at a pH of greater than about 6.0 and an elevated dyeing temperature greater than about 100&deg; C. for a time sufficient to dye the textile article with minimal loss of melamine fibers due to acid hydrolysis. Most preferably, the textile article or articles to be dyed is placed into the dye bath at ambient temperature, and thereafter the dye bath containing the textile article or articles to be dyed is heated to the elevated dyeing temperature, for example, at a rate of between about 0.5 to about 2.0&deg; C. per minute. Suitable dyes include non-complexed acid dyes or acid dyes complexed with a metal (e.g., iron, cobalt, copper, aluminum or any transition metal). Suitable acid donors include butyrolactones, ethylene glycol monoformates and ethylene glycol diformates. The textile article may be formed entirely of melamine fibers or may be in the form of a blend of melamine fiber with at least one other type of fiber (e.g., aramid fibers).

Methods for deep shade dyeing of textile articles containing melamine fibers

Articles made from melamine fibers and aramid fibers are dyed at selected conditions and with selected dyes such that the aramid fiber is dyed but the melamine fiber is not.

Articles having a chambray appearance and process for making them

Melamine fibers and cellulose fiber combinations are dyed with certain dyes such that the cellulose fiber is dyed by the dyes but the melamine fiber is substantially undyed. When in fabric form, a chambray appearance is given.

Dyeing articles composed of melamine fiber and cellulose fiber

A process for preparing photochemically stable dyed nylon compositions includes providing to a dyebath a shaped article of poly(epsilon-caprolactam) hydrolytically polymerized in the presence of water, a carboxylic acid chain regulator and a hindered piperidine derivative; and in the dyebath, dyeing the shaped article with one or more metalized or nonmetalized acid dyestuffs.

Photochemically stabilized polyamide compositions

Fabrics made of melamine fibers are made more comfortable by submerging them for at least 20 minutes in a dyebath or mock dyebath that is at least 70.degree. C.

A predominantly polyester fabric has a multi-colored pattern. The fabric includes at least one non-aromatic, partially crystalline polymethylolefin yarn melting above about 180.degree. as less than 50%, by weight, of the fabric, and polyester yarn. The polymethylpentene yarn and the polyester yarn are fabricated in a predetermined pattern and then piece dyed with disperse dye techniques.

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Asheville, NC, United States of America

Dean R Gadoury