US2031046A - Process for the prevention of the bleeding on white animal fibers - Google Patents

Description

Patented Feb. 18, 1936 PATENT OFFICE PROCESS FOR THE PREVENTION OF .THE

. BLEEDING ON WHITE ANIMAL FIBERS Albert Landolt, Basel, Switzerland, assignmto the firm Society of Chemical Industry in Basle,

Basel, Switzerland No Drawing.

Application June 17, 1931, Serial No. 545,145. In Switzerland June 20, 1930 7 Claims.

The present invention refers to a process for the prevention of the bleeding out of dyed textiles on white animal fibers, particularly wool, but also natural silks, in presence of aqueous solutions the pH of which is not greater than 7. It comprises the process herein referred to, and the wool treated according to the said process.

Dyed wool, as is well known, is washed and milled with aid of solutions having a more or less pronounced alkaline reaction. By this operation a more or less considerable amount of the dyestufi is very easily removed from the fiber, so that if dyed wool is intended to be washed or milled, the'wool must from the start be dyed with dyestuifs fast to Washing or milling. Formerly such dyestuffs were the after chroming dyestuffs. In recent times other classes of dyestufis have been placed on the market the dyeings of which from an acid bath withstand washing and milling. Such dyestufis are for example the products known in the trade as Neolan dyestuffs, Lanasol dyestuffs, cloth fast dyestuffs, Fullacine dyestuffs, etc.Neolan, Lanasol and Fullacine being registered trade marks.

However, the wool is not only treated with aid of solutions having an alkaline reaction. It can also be treated with solutions which are neutral or weakly acid, 1. e. with solutions the pH of which is not greater than '7. In these operations (for example water-milling, boiling in presence of acids, or acid-milling) the dyestuffs remain better fixed on the fiber in general than in the case of the treatment with alkaline solutions. In the said operations, however, in which the pH of the solution used does not lie above 7, a. stronger bleeding out on white wool is in general taking place than in the case where the solutions used are alkaline.

I have now found that the auxiliary agents for the textile industry which possess the capability of lowering or eliminating or retarding the afiinity of animal fibers for dyestuffs, are in a remarkable degree adapted to increase the fa'stness to acid milling, water milling and acid boiling of wool dyed with dyestuffs which dye from an acid bath. They are particularly capable to'prevent the bleeding out of the dyed wool on white wool milled or boiled along with it.

Such textile auxiliary agents, which are able to lower or eliminate or retard the affinity of anisulfonic acids, such as naphthalene sulfonic acid,

with alcohols (aliphatic, cyclic, aromatic-aliphatic alcohols),--such condensation products correspond to the various brands known on the market under the registered names Nekal" and I Leoni1'; the products which can be obtained by condensation of aromatic sulfonic acids with I benzoin and, if necessary, by further condensation with alcohol; further sulfo ricinates, such as the Prestabite oils of the commerce; further synthetic tanning agents, such as the condensation products of formaldehyde with naphthalene -sulfonic acids, etc.

Since the number of acid wool dyestuffs is considerable which bleed out in acid and water milling, or when boiled in an acid bath and, therefore, stain white wool milled or boiled along with the dyed wool, the present process constitutes a great technical advance.

The following examples illustrate the invention, the names Kiton, Neolan, Katanol, Thiotan, Lanasol, Fullacid, Nekal, Rhodamine, Leonil, Prestabite, Tartrazine mentioned therein being registered trade marks.

Example 1 W001 is dyed as usual in an acid bath with 3 per cent. of acid blue RBF (Colour Index page 337), and then subjected to the following acid milling: The dyed wool mixed with 50 per cent. of white wool is milled for 4 hours in a milling bath containing per litre 1 gram of sulfuric acid, and 5 per cent. of the product obtained by condensing naphthalene-B-sulfonic acids with benzoin and isopropylalcohol (of. Example 1 of Patent No. 1,833,245), calculated on the weight of the wool. Proportion of material to milling liquor 1:50. The white wool milled along with the dyed wool is not or only very slightly stained, whereas strong bleeding takes place without the addition of the mentioned product.

' Example 2 W001 is dyed as usual with 2 per cent. of Kiton fast orange G (Colour Index No. 27-) and subjected, after having been mixed with white wool,

to the following water milling: the milling is performed during 4 hours at 50 C. in a milling bath containing per litre 5 per cent. of the product obtained by condensing naphthalene-B-sulionicacids with benzoin and isopropyl alcohol (cf. Example 1 of Patent No. 1,833,245), calculated on the weight of the wool. Proportion of material to milling liquor 1:50. In this manner the bleeding of the dyestufi used on white wool is 5 prevented to a great extent, which is not the case without the addition.

Example 3 W001 is dyed with 3 percent. of Neolan orange m GRE (Schultz 1932, vol. 2, page 154) in the manner usual for Neolan colors and the dyed material, which may be mixed with white wool, is subjected to the following acid milling: 1 litre of milling liquor contains 1 gram of sulfuric acid and 5 per cent. of Katanol WL calculated on the weight of the wool. Milling is performed during 4 hours at 50 C. The dyestuff does not stain white wool, but strong bleeding takes place without the addition of Katanol WL.

Example 4 W001 dyed with 3 per cent. of Neolan green B (Colour Index Supplement, page 46) is boiled along with white wool in an acid bath of the following composition: 1 litre of water, 1 gram of sulfuric acid and 10 per cent. of the product obtained by condensing naphthalene-fl-sulfonic acids with benzoin and isopropyl alcohol (cf. Ex-

ample 1 of Patent No. 1,833,245), calculated on the weight of the wool. The whole is boiled for A hour, after which time the dyestuif has stained 4 the white wool quite considerably less than had the addition of the said product to the acid boiling bath not been made. The shade of the dyed goods changes very much less with addition, than without addition of-the mentioned product.

. Example 5 In a hot acid bath wool dyed with Kiton blue A (Colour Index No. 714) bleeds very strongly on to white wool. This bleeding out can be prevented if 2 grams of Katanol W per litre of treating liquor are added to the boiling acid bath. Even after boiling for one hour, white wool is not bleeded on when treated in this manner.

Example 6 A material dyed with Orange II (Colour Index No. 151) is subjected in the following manner,

in the presence of white wool, to an acid-milling:The milling is carried out for 4 hours with 2 grams of sulfuric acid per litre, at a temperature of C. In this operation white wool is very strongly bleeded on by orange II. However, if 2 grams of Thiotan RS per litre are added to the acid-milling bath, white wool is scarcely bleeded on. In a similar manner behave other acid wool dyestufls, such as: Tartrazine, (Schultz 1931,

vol. 1, No. 737) Alizarine fast violet R, (Colour Index Supplement, page 26) Lanasol green G, (Schultz 1932, vol. 2, page 142) Kiton fast red 4BL,.(Schultz 1932, vol. 2, page 138) and even direct dyeing dyestuffs, such as direct fast scarlet WS (Colour Index Supplement, page 39).

- Example 7 v A dyeing made with 3 per cent. of Fullacid red G (Schultz 1932, vol. 2, page 111) is treated for 4 hours at 50 C. with a milling liquor containing per litre water 2 grams of Katanol W.

The wool dyed with Fullacid red G does not bleed on to white wool or silk milled along with it, which would be the case without the said addition.

Example 8 Wool dyed with 3 percent. of Kiton red G (Colour Index No. 31) is boiled together with white wool in a bath containing 4 per cent. of sulfuric acid, 10 per cent. of Glaubers salt and 2 grams per litre of the product obtained by condensing naphthalene-p-sulfcnic acidswith benzoin and isopropyl alcohol (cf. Example 1 of Patent No. 1,833,245). A bleeding of the dyestufl on to white wool boiled along with the dyed wool 10 hardly takes place. f

Example 9 Woollen material dyed with 3 per cent. of Kiton fast orange G (Colour Index No. 27) is 15 subjected to an acid milling according to Example 7 above, while adding 2 grams of Nekal BX (probably a butylated naphthalene sulfonic acid) per litre of milling liquor. By the said addition the bleeding, of the dyestuif on to white wool 20 milled along with the dyed wool is prevented. In a similar manner behave the dyestufis: Kiton red 6B (Colour Index No. 57) Kiton red S (Colour Index No. 54), Kiton fast red R (Colour Index, page 357), acid Rhodamine 3R (Colour Index, page 337), acid violet GBN (Colour Index No. 717), Kiton pure blue V (Colour Index No. 672 cf. Supplement page 44), benzyl green B (Colour Index No. 667), etc.

Example 10 The so-called water-milling, as described in Example 8, is carried out with woollen material dyed with 3 per cent. of brilliant Kiton red B (Colour Index No. 748) The milling liquor contains 2 grams of Leonil S (probably an alkylated naphthalene sulfonic acid) per litre. The dyestuff which, without this addition, bleeds strongly on white wool, leaves the same almost pure white.

Example 11 The bleeding out of the 'dyelng made with benzyl violet 5BN, (Colour Index No. 698) in an acid boiling bath according to Example 12,.can be prevented by adding 2 grams per litre of the condensation product of naphthalene sulfonic acid and formaldehyde. It is to be noted that not only the white wool boiled along with the dyed material, but also white cotton which may be present, were protected against the bleeding on.

Example 12 The acid milling described in Example 7 is carrled out with dyeings of 3 per cent. (calculated on the weight of the wool) of Kiton blue A (Colour Index No. 714). An addition of 2 grams per litre of the condensation product of naphthalene sulfonic acid and formaldehyde prevents the bleeding out of the dyestufi on to white wool and 60 white cotton.

Example 13 The water-milling described in Example 8 is carried out with a woollen material dyed with 2 5 ing, water milling and acid boiling is also manifest, if the wool to be dyed is already treated in the dyeing bath with the said additions, and then carrying out the mentioned fastness tests without further additions.

What I claim is:

1. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous milling of dyed wool and undyed wool in an aqueous solution having a pH-value not greater than '7, consisting in adding to the solution a textile auxiliary obtained by causing a compound selected from a group of products consisting of alcohols and aldehydes to react with a napthalene sulfonic acid.

2. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous milling of dyed wool and undyed wool in an aqueous solution having a pH-value not greater than '7, consisting in adding to the solution a textile auxiliary obtained by causing a compound selected from a group of products consisting of alcohols and aldehydes to react with a naphthalene monosulfonic acid. I

3. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous acid milling of dyed wool and undyed wool in an aqueous solution having a pH-value smaller than '7, consisting in adding to the solution a textile auxiliary obtained by causing a compound selected from a group of products consisting of alcohols and aldehydes to react with a naphthalene sulfonic acid.

4. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous acid milling of dyed wool and undyed wool in an aqueous solution having a pH-value smaller than 7, consisting in adding to the solution a textile auxiliary obtained by causing a compound selected from a group of products consisting of alcohols and aldehydes to react with a naphthalene monosulfonic acid.

5. Process for the prevention of the bleeding of dyed Wool onto undyed wool in the simultaneous acid milling of dyed wool and undyed wool in an aqueous solution having a pH-value smaller than 7, consisting in adding to the milling bath a condensation product from formaldehyde and a naphthalene sulfonic acid.

6. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous acid milling of dyed wool and undyed wool in an aqueous solution having a pH-value smaller than 7, consisting in adding to the milling bath a condensation product from benzoin and a naphthalene sulfonic acid'.

7. Process for the prevention of the bleeding of dyed wool onto undyed wool in the simultaneous acid milling of dyed wool, and undyed wool in an aqueous solution having a'pH-value smaller than '7, consisting in adding to the milling bath a condensation product from butyl alcohol and a naphthalene sulfonic acid.

ALBERT LANDOLT.