Alkanol Substituted Disazo Orange Dye for Nylon

The following examples will serve to describe the preparation of the Structure I compounds, demonstrate the compatibility of the color components used in the trichromatic dye systems of the invention, and illustrate the use of said systems in the dyeing of polyamide carpet fibers. In the examples, parts and percentages are by weight and temperatures are given in degrees Centigrade, unless otherwise stated.

A solution of 17.3 parts of sulfanilic acid in 4 parts of sodium hydroxide and 100 parts of water was diazotized directly at 0.degree.-5.degree. C. in the usual, known manner by adding 25 parts of concentrated hydrochloric acid followed by 7 parts of sodium nitrite dissolved in 20 parts of water. After addition of sulfamic acid to remove the slight excess of nitrous acid, the diazo slurry was added to a cold (10.degree. C.) solution of 18.1 parts of 1-(2-amino-4-methylphenoxy)-2-propanol in 100 parts of water and 12 parts of concentrated hydrochloric acid. Sodium hydroxide solution was slowly added to raise and maintain the pH in the range 4.0-4.5 until the coupling was complete. After acidification with 25 parts of concentrated hydrochloric acid, the slurry was treated with 7 parts of sodium nitrite dissolved in 20 parts of water. After stirring at 30.degree.-35.degree. C. for two hours, the crystalline diazonium salt was isolated by filtration, and the filter cake was added to a cold (5.degree. C.) solution of 10.6 parts of 85% phenol, 6 parts of sodium hydroxide, and 100 parts of water. The so-formed compound in the reaction mass was of the structure ##STR18## After two hours the pH of the reaction mass was adjusted to 11 with sodium hydroxide solution, and 35 parts of diethylsulfate were added dropwise while the temperature of the reaction mixture was maintained in the range 50.degree.-55.degree. C.

Upon completion of ethylation, the dye was precipitated by addition of 50 parts of sodium chloride. Filtration and drying yielded 45 parts of an orange, water-soluble powder having the structure ##STR19##

This compound dyed nylon carpet fibers from aqueous dyebaths in bright orange shades having excellent light fastness.

Metanilic acid (17.3 parts) was dissolved in 100 parts of water by addition of 4 parts of sodium hydroxide and diazotized directly at 0.degree.-5.degree. C. in the usual, known manner by adding 25 parts of concentrated hydrochloric acid followed by 7 parts of sodium nitrite dissolved in 20 parts of water. Following decomposition of the slight excess of nitrous acid by addition of sulfamic acid, the diazo slurry was added to a cold (10.degree. C.) solution of 18.1 parts of 1-(2-amino-4-methylphenoxy)-2-propanol in 100 parts of water and 12 parts of concentrated hydrochloric acid. Sodium hydroxide solution was slowly added to raise and maintain the pH in the range 4.0-4.5 until coupling was complete. The slurry was acidified with 25 parts of concentrated hydrochloric acid and then treated with a solution of 7 parts of sodium nitrite dissolved in 20 parts of water.

The precipitated diazonium salt was isolated by filtration after stirring at 30.degree.-35.degree. C. for two hours. The filter cake obtained was added to a cold (5.degree. C.) solution of 10.6 parts of 85% phenol in 100 parts of water and 6 parts of sodium hydroxide. After two hours stirring, the pH was adjusted to 9.2 with hydrochloric acid, and 15 parts of propylene oxide were added. The mixture was heated to and maintained at gentle reflux for four hours. The resulting solution was treated with 1 part diatomaceous earth as a filter aid and filtered.

Spray drying of the filtrate yielded 40 parts of a dark orange, water-soluble powder having the structure ##STR20##

This powder dyed nylon carpet fibers from aqueous dyebaths in bright orange shades having excellent light fastness.

The dyes of Examples 3-12, summarized in the following table, were prepared as their sodium salts by procedures similar to those described in the preceding examples. The position and identity of the various substituents refer to groups identified in Structure Ie.

All of the resulting dyes colored nylon carpet fibers from aqueous dyebaths in bright orange shades having excellent light fastness.

A dyebath was prepared containing the following:

In addition, the bath contained 10.0 grams of the sodium salt of dioctylsulfosuccinate as a wetting agent, 5.0 grams of the tetrasodium salt of ethylenediaminetetraacetic acid as a sequestrant, 5.0 grams of an alkyl arylethersulfonate as a levelling agent, and 750 grams of a 1% solution of a synthetic, acid-hydrating guar gum. The bath was diluted to a total volume of 5.0 liters and the pH adjusted to 6.5 with acetic acid. It was then charged to a Kusters Continuous Application Roll Lab Carpet Dyeing Unit.

A 40-ounce sample of 100% nylon 6.6 Saxony carpet having a synthetic backing was impregnated with the above-described dye liquor at a running speed equivalent to 5 yards per minute. It was then squeezed out at a squeeze roll pressure of 10 p.s.i. to 400% liquor take-up, calculated on the dry weight of the carpet. The sample was subjected to steam at 212.degree. F. for 6 minutes, rinsed with cold water and dried.

A level-dyed carpet of medium brown shade having excellent fastness to light and atmospheric gases was obtained.

A dyebath was prepared containing the following:

In addition, the bath contained 10.0 grams of the sodium salt of dioctylsulfosuccinate as a wetting agent, 5.0 grams of the tetrasodium salt of ethylenediaminetetraacetic acid as a sequestrant, 2.5 grams of an alkyl arylethersulfonate as a levelling agent, and 750 grams of a 1% solution of a synthetic, acid-hydrating guar gum. The bath was diluted to a total volume of 5.0 liters and the pH adjusted to 8.0 with disodium phosphate. It was then charged to a Kusters Continuous Application Roll Lab Carpet Dyeing Unit.

A pre-wetted 40-ounce sample of 100% nylon 6 Saxony carpet having a synthetic backing was impregnated at 400% wet pick-up with the above-described dye liquor at a running speed equivalent to 5 yards per minute. The sample was then exposed to steam at 100.degree. C. for 6 minutes, rinsed with cold water and dried.

A level-dyed carpet of medium brown shade having excellent fastness to light and atmospheric gases was obtained.