US1213045A - Fixation of acid colors on cotton. - Google Patents

Description

- UNITED STATES. PATENT OFFICE.

FREDERICK WILLIAM WEEKS, OF EDGWORTH, ENGLAND.

FIXATION OF ACID COLORS ON COTTON.

Be it known that I, FREDERICK WILLIAM WEEKS, a British subject, residing at'Edg- Y worth, county of Lancaster, England, have invented certain new and useful Improvements in the Fixation of Acid Colors on Cotton, of which the following is a specification. I n

This invention relates to improvements in the fixationof acid colors on cotton in dyeing and calico print ng.

Great eiforts have been made to utilize the acid wool colors in cotton dyeing and calico printing to give resulting shades which should be reasonably fast to washing and soaping. The usual methods of applying the aforesaid class of coloring matters to cotton fabrics, result in the production of shades which are extremely loose to washing and materials so treated will not stand the slight est subsequent treatment such as washing or soaping.

The object of the present invention is to produce dyed or printed shades on cotton goods, by means of the acid wool dyestuffs, which shall be capable of withstanding such after-treatment as is usually applied to dyed and printed goods produced by methods commonly in use. Such after-treatment might be in the case of printed goods, a run through hot soap solution on the open soap-- ing machine, or in the case of dyed goods a thorough washing with boiling water. To produce such efi'ects I utilize as fixing agents or mordants for the acid dyestufi's, the condensation products formed by the interaction-of amins and aldehydes or their chemical equivalents.

In the production of dyed goods I impregnate the material on the ordinary slop padding machine with a mixture made u as follows 12- ozs. anilin salt dissolved in 3 'qts. water. To which when dissolved is added 1 pt. hexamethylene tetramin solution and the whole made up to 1 gallon. This padding mixture may have added to it, if desired, a small quantity! of gum dragon thickening.

After padding and drying, the material is mordanted and capable of being dyed with acid dyestufis, using methods similar to those forapplying the same dyestufl's to ,WQ j Another method of dyeing consists in padding the material with a mixture containing thecoloring matter and fixing agents Specification of Letters Patent.

Patented J an. 16, 191'7.

Application filed August 12, 1916. Serial No. 114,622.

in the same bath. Thus a bright yellow may be dyed by padding the material in the following mixture. 2% lbs. tartrazin dissolved in 8 gallons Water, to which is added, 10 gallons gum dragon thickening 4 ozs. per gallon, 1 gallon anilin salt solution 4 lbs. per gallon, 1 gallon hexamethylene tetramin solution.

After padding and drying, fixation is completed by steaming the goods 1 hour in a suitable steamer.

For printing we use colors made up on the following lines :7?; lbs. Victoria scarlet 4R dissolved in 5 gallons water, to which is added lbs. maize starch. 1% lbs. tapioca flour. cooled, and has' added to it 7 lbs. gum dragon paste (4 ozs. per gallon), 3 gallons anilin salt solution (4 lbs. per gallon), 2% gallons hexamethylene tetramin solution.

After printing and dryingthe material is steamed for 1 hour in a suitablesteamer, after which it can be soaped and dried on the open soaping range. I

In these examples the hexamethylenetetramin solution is prepared by mixing together equal volumes of ammonia 20% and to vary the amount of anilin salt solution according to the color used, it being readily understood that such alteration is necessary, owing to the great differences in constitution existing between the diflerent members of the group of acid colors.

Although in the various examples given the amin employed is a primary amin, viz., anilin salt solution the invention is not limited to primary amins but other amins will form compounds by their interaction with aldehydes which can be employed as the fix,- ing agents or mordants. 1

, It has been found that in the case of dyestuffs belonging to the series of sulfonated basic colors, e. 9., acid violet 2B, acid green, acid magenta, the reducing action of the formaldehyde comes into play during the steaming operation, so that the shades produced require va suitable oxidizing process in order to develop them to their fullest intensity. v

What I claim as my invention and desire to protect by Letters Patent is 1. In the dyeing or printing of cotton fabconstant, as fixed in the previous recipe, and i rics with acid dyestufi's, the method of treating the fabrics with fixing agents or mordants consisting of condensation products formed by the interaction of amins and aldehydes.

2. In the dyeing or printing of cotton fabrics with acid dyestufi's, the method of treating the fabric with fixing agents or mordants consisting of condensation products 10 formed by the interaction of amins and aldehyde compounds which yield an aldehyde when steamed or heated.

3. In the dyeing of cotton fabrics with