US1326367A - Dye and process of dyeing. - Google Patents

Description

' .taining about equimolecular Wrap it. ill b DYE AND PRDGESS GE llTff'J-EKNG.

To aid whom may concern:

lie it known that l, demos A, llnauwll-mo, a citizen of the United States, residing); at otre. Dame, in the county of St. Joseph and Eitate oi Indiana. have invented certain new and useful improvements in Dyes and Processes oi Dyeing, ct which the folio ring is a specification.

it is known that mercuric salts are capahle otreacting with certain aromatic derivatives. particularly phenols and amino bodies, with the production oi complex lerivati'i'es containing mercury (Hein ein, 3d edition, Vol. IV, page 1703). i'iccordinp' to the present invention a new dye-bath is prepared hy the interaction of mercuric salts and p-phenylene diamin. My invention comprises also a process whereby the "fabric is dyed simultaneously with the preparation oi the dye-birth.

lihtainple l: tine molecular PTOPULHUH of p-phei rlene diamin dissolved in water or dilute alcohol is mixed with one n'iolecular proportion of a salt of mercury, preferably mercuric acetate or other readily hydrolyzably a hi. lily complex derivative of mercitric acetate, Upon standing the mixture is found to acquire a dark color as the result ot secondarr reactions, the precise nature of which is not now known. Heating the mixture to temperatures above normal, and preferably to the boiling-point, causes the formation of a purple-blacl dye-bath, which is capable oi? dyeing; sill; and cotton w thout an extraneousmordant. T his direct dyeing of cotton may perhaps be eXplained by the mordantiug action and oxidizing efiect ot the mercuric acetate which is a component of the dye-bath.

Example H: Instead of boiling the previously mixed solutions of mercuric acetate and pihenylene diamin, these solutions conproportions of the respective compounds, may be heated separately to boiling; and then mined. in dyeing: cotton for example, the well Washed time may he immersed in the hot mercuric acetate solution, or boiled therein, and then transferred to a heated or boilingalcoholic (dilute) p-phenylene dianiin solution, preferably after an intermediate Washing with Specification of iii-otters Patent.

Application filed December 3, 1917.

The ensuing reaction yields a. cloudyprecipitate, which is prol ll attented Dec. Sill,

Serial No. 205,201.

water or dipping in a solution of zinc chlorid or sodium chlorid. The order of dipping); is important, the fabric being first immersed in the mercuric salt solution, A material excess of acetate, either in preparation or in dyeing", tends to injure the color,

' hit he s i, l i lcconoru ledCt-lOll resulting in i the formation of the new dye-hath is probably ct an oxidizing; character is indicated by the tact that some metallic mercury may be deposited, with partial destruction of the dye, in case a considerable excess of mercuric salt used. I

Eiiorts to isolate the new dye have as yet resulted negatively, since evaporating the solution even at ordinary temperatures results in the deposition of an insoluble black compound which is probably. a lake.

T he color on cloth is not immediately attacked by dilute acids, nor to any material degree by dilute alkalis. By the action or strong; hyth'ochloric acid upon dyed silk, the tahric is dissolved, leaving some of the dye in solution.

Example Hi The dyeing processes of Ere amples l and ill may advantageously be combinedin case an especially deep color is desired, in the following manner The well washed fabric is boiled first in mercuric acetate. then in an aqueous or dilute alcoholic solution of p-phenylene (liamin and is finally transferred to a heated or boiling equimolecular mixture of the two compounds. Byythis procedure the color may be deepened Without subjecting the dyed fabric to the injurious etlect ot the mercuric acetate solution.

I claim 1. The lierein-described method of preparing: a dye-bath, which consists in reacting with a mercuric salt upon a solution of p-phenylene diamin at a temperature above normal.

2. The hereiodescribed method of dyeing fabrics, which consists in subjecting the fabric to the successive action of solutions containing respectivelv a mercuric salt and p-phenylene diamin.

3. The herein-described method of dyein; fabrics. which consists in su fabric to the successive action 01 solutions containing; respectively a mercuric salt and p-phenylene diamin, and then further subjecting' the dyed fabric to a solution co11 products of mercuric acetate and p-phenyraining reaction products of a mercuric salt lene diamin. and p-phenylene dialnin. 6. A dye-bath containing the product of 10 A dye-bath containing" the reactionsecondary decomposition of mercuric de- 5 products of a mercuric salt and 'p-phenylene rivatives of p-phenylene diamin.

diamin. In testimony whereof, I aflix my signature. 5. A dye-bath containingthe reaction- JULIUS A. NIEUWLAND.