USRE18590E

USRE18590E - Ebwabd b

Info

Publication number: USRE18590E
Authority: US
Publication date: 1932-09-06

Description

Reissued Sept. 6, 1932 um'rsb STATES PATENT OFFICE,

ASSIGNORS, BY MESNE, ASSIGNMENTS, TO KREBS PIGMENT & COLOR CORPORATION, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE ROS IN SOAP LAKES OIF AZO COMPOIO'NDS No Drawing. Original No. 1,772,300, dated August 5, 1930, Serial No. 262,332, filed March 18, 1928. A11- plication for reissue filed March 3, 1932. Serial 1T0. 596,668.

the case of certain colors. According to prior art practice the rosin soap has been added to the dye solution or to the commercial paste, and subsequently converted into the metallic soap simultaneously with the precipitation of the dyestufi, but Without specific attention to the optimum conditions for the development of the lake. By the term development as used herein, we refer to that well known practice in manufacturinglakes which consists essentially in heating or boiling the color after its various components have been incorporated one with the other.

A principal object of the present invention is to increase the yield of the dry product of lake pigments from a given amount of the dyestufl's employed, i. e., to obtain a substan-- tially higher yield of pigment from a given amount of dyestuff without a corresponding decrease in tinctorial strength'as would be obtained in the use of an inert diluent. Another object of the invention is to increase the brilliancy and improve the power of the lake pigment to produce an ink of superior I printing tone; A further object of the invention is the production of lake pigments having higher oil absorption, and other improved properties than those of the prior art. Other objects'will'appear as the description proceeds.

We have found that the use of substantial quantities of the metallic derivatives of rosin soap in lake pigments functions entirely differently than the smaller quantities heretofore used, when the lake is developed in the presence of the metallic rosinate in a neutral or preferably an alkaline medium and that according to our invention it results in the formation of a lake substratum which does not decrease the tinctorial strength of the final product thus indicating that it does not in any way act as 'a diluent. Not only thisbut the tinctorial qualities are greatly improved, for example,

a clearer, brighter masstone, more brilliant undertone and clearer tint results, and the printing tone obtained by printing 'with an ink containing this material, is far superior to a similar product made according to the prior art. The results were not to be expected and were in no way indicated by the prior art. The tinctorial strength may also be determined by measuring the covering power by means of tinting out the pigment with white.

One of the outstanding merits of the pig- EDWARD n. ALLEN, or sumn'r. AND ALFRED SIEGEL, or HILLSIDE, NEW JERSEY,

ment prepared according to this invention or possess a highly objectionable bronze printing tone.

In the case of those pigments which do not give rise to a bronzy printing tone, the

comparative difference is not marked but our invention in this particular does result in a higher and more glossy finish on the printing tone as a result of the higher oil absorption and better working qualities of the pigment. It will beunderstood, of course, that this invention is not limited to the pigments referred to in the foregoing, but other pigments may be similarly modi- The rosin soap is incorporated with the azo compound, preferably prior to its filtration, and the rosin soap is converted into a metallic soap simultaneously with the precipitation of the azo compound.

It is to be understood that the term rosin soap as used in the following examples and elsewhere in this application, refers to rosinates or the metallic derivatives of rosin. The expression rosin soap as used herein covers the soap obtained from resins containingsubstantial amounts of abi'etic acid.

As specific examples of procedure, in ac- ,cordance with our invention, the following will serve, but it is to be understood that these examples are for illustrative purposes only and are not to be taken in any Way as limitations of our invention.

Example I A solution of the sodium salt of 2-naphthlyamine l-sulphonic acid corresponding to 111.5 parts of the free acid, is diazotized in the usual manner with 37.75 parts of sodium' nitrite and 204 parts of muriatic acid B. The major part of the excess mineral acid is then removed from the insoluble diazo body by means of washing. In a separate container a solution of 80 parts of betanaphthol and parts of caustic soda is-prepared and made to a volume corresponding to approximately 2500 parts of water. After'the temperature of this solu-' To a solution of 26.5 parts of caustic soda in 325 parts of water there is added 75 parts of rosin. The volume is then brought to the equivalent of approximately 1900 parts of water, the preparation boiled to complete the saponification. This preparation of rosin soap is then run into the charge of the azo dye, described above, and the temperature and volume of the combining solutions so adjusted that the temperature of the resulting charge does not drop below 30 C. 7

It will be evident from the above figures that the reaction mass contains at this point alkali equal to 0.75 mol NaOH for each mol of dyestufl' produced. The charge is then precipitated with a solution of 240 parts of, barium chloride in 5,000

- parts of water, brought to a boil in order to develop thelake, and the product then Washed, filtered, dried, and ground in the usual manner.

The yield is approximately 315 parts of dry product compared with 225 parts in a charge prepared without rosin soap. The resin soap lake is equal in covering power (determined by tinting in white) to the product obtained without the use of rosin soap, and is equal in this respect-to the ordinary commercial barium lithol toner. It is much brighter in shade, cleaner in tone, and when ground into litho varnish to produce a printing ink, the latter product gives a print which possesses a bright, firey, bronge-iree tone not hitherto possible from the tonersof-the lithol red class. In other words, this new product possesses the strength of a toner and the printing qualities of a lake.

Emample II V The procedure is the same as that-described in Example I except that instead of 26.5 parts of caustic soda in the rosin, only sufficient of this alkali is used to convert the rosin into a. soap. The product so obtained is a pigment much lighter and yellower than that described under Example I.

The yield is equivalent to that obtained in Example I. The only difference between this example and the preceding one is that in Example II the dye is developed in the presence of a lesser amount of alkali resulting Y in a pigment of much lighter and yellower shade and this example illustrates the effect of the absence of alkali. during the development of the pigment. 1

Example III Y The same procedure is used as in Example I except that parts of rosin is prepared as rosin soap instead of 75. parts as in Example I, and 88 parts of calcium chloride are used to effect the precipitation instead of the 240 parts of barium chloride. It will be seen when compared with Example I that the rechloride and the development contains a still larger amount of alkali.

ordinary calcium lithol red used in the trade.

The yield is approximately 275 parts of dry powder compared with 200 parts obtained without the rosin soap. The superiority of the rosin soap lake is similiar in this case to that described in Example I.

Ema/ripple I V The procedure is the same as that described in Example III except that'the rosin soap isaddcd to the azo compound at the boil, and the precipitation and development of the color is'carried out at this temperature. The pigment obtained by this procedure is camparable in blueness of tone to that described in vI)RP24 5, 747 (Friedlander x, page 936) The yield isequivalent to that of Example III. The product is maroon. orssclaret in action mass prior-to the addition of calcium The product so obtained corresponds in depth of shade to the shade, whereas that described in Example III 7 is bluish red. The product possesses the same qualities as to power to produce an ink yielding a bronzeless printing tone.

I Emample V- A solution of 52.25 parts of. the sodium salt of paratoluidinemetasulphonic acid (CH SO NH =1.: 3 4) is diazotized with 18 parts of nitrite of soda and'65 parts of 20 B. muratic acid. 50 parts of betaoxynaphthoic acid (OH:COOH=2:3) is dis- 7 solved in a solution of parts of sodium hydroxide in 400 parts of water. To this is then added 54 parts of soda ash in 300 parts of water.

In a separate container 22.5 parts of rosin is added to a solution of 3.6 parts of sodium hydroxide in 300 parts of water, and the solu tion boiled to effect the formation of the rosin soap. This solution of rosin soap is now added to the above described solution of beta-oxynaphthoic acid, the volume brought to the equal of 1250 parts of water, 11.5 parts para soap added, and the temperature adjusted to C. The above described diazo preparation is then run in whereupon the azo coupling proceeds quickly and to good completion. The charge is adjusted to neutrality, the volume brought to the equivalent of 25,000 parts of water, heated to 57 (1, and the color precipitated with a solution con taining 86 parts of calcium chloride. The charge is then brought to the boil, and digested at this temperature for 15 minutes, after which it is washed, filtered, and dried in the usual manner. mately 146 parts of pigment compared with 112 parts in a charge carried out'inexactly' the same way but without the rosin. The rosin soap lake is equalin strength to the normal product and is superior to it in richness of shade, clarity of tone, and freedom from bronze on the printing tone obtained from printing inks prepared from it.

Example VI is diazotized with 18 parts of nitrite of soda and 65 parts of 30 B. muriatic acid.

parts of beta-oxynaphthoic acid are dissolved in a solution of 21 parts tion is adjusted to 40 C. and the above de-' scribed diazo preparation is then run in whereupon the azo coupling proceeds quickly and to good completion. After stirring a short time the dyestutf is filtered.

The soda salt dye paste is then reslurried in 25,000 parts of water at 40 C. To this are added 11.5

parts of para soap in 00 parts of Water.

In a separate container 6 parts of rosin are added to a solution of 1.6 parts of sodium hydroxide in 400 parts water, and the solution boiled until the formation of the soluble rosin sodium salt is complete. This rosin soap solution is then added to the dye solution and the temperatureadjusted to 40 C. and stirred 15 minutes.

The yield is .approxi- .boiland digested at this temperature for hour, after which it is washed, filtered, and

dried in the usual manner. The yield is approximately 127 parts of pigment compared with 120 parts in a charge carried out in exactly the same way but without the rosin. The rosin soap as-calcium rosinate is 5.51 per cent of the finished dry pigment color.

Example VII A pigment color is prepared in a manner similar to the above and from slmilar ingre- ,dients, but the amount of calcium rosinate is increased to 11.1 per cent in the finished dry pigment color. The rosin soap solution is prepared as follows:

13' parts rosin are added to a solution 2.6 parts of sodium hydroxide in 600 partsof water and the solution boiled until the for mation of the soluble rosin sodium salt is complete. This is then added to the dyestufi' as in Example VI. The alkalinity during the development is. the same as in the preceding example. The yield'is approximately 134 parts of pigment as compared with 120 parts in a charge carried out in exactly the same way but without the rosin.

The calcium rosinate in this case comprises 11.1 per cent of the finished dry pigment color.

E wample VIII A solution of the sodium salt of 2-naphthylamin'e l-sulphonic acid corresponding to 111.5 parts of the free acid, is diazotized in the usual manner with 39 parts of sodium nitrite and 204 parts of 20 B. muriatic acid.

.In a separate container a solution of 80 parts of beta naphthol and 36 parts of caustic soda is prepared and made to a volume corresponding to approximately 2500 parts. After the temperature of this solution has been adjusted to 25 C. the diazo suspension, formed as indicated above, is introduced into the beta naphthol solution. When one-half of the diazo suspension has beenadded a solution of 15 parts of caustic soda dissolved V in 40. parts of water is added and the coupling completed. The coupling proceeds rapidly and to good completion. The volume is then made to 13,000 parts and heated to 40 C. in 15 minutes. 1

In a separate container 150 parts f rosin are added to a solution of 35 parts o caustic soda and 2100 parts of water and the preparation boiled to complete'the saponification. This preparation of the rosin-is then run into the charge of the azo dye,- described above,

and the temperature of the combined solutions adjusted to 40? C. It will be evident from the above figures that the reaction mass contains at this point free caustic alkali equal to 1.75 mols NaOH for each mol of dyestuif produced. In a separate'container 270 parts 1 of barium chloride crystals are dissolved in product is then washed, filtered, anddried and ground in the usual manner.

The yield is approximately 397.5 parts of dry pigment color as compared with 240 parts actually obtained in a charge prepared in a similar manner but without rosin soap. The amount of barium rosinate comprises per cent of the finished dry pigment color.

Example [X P I I The procedure is the same as that described in Example VIII except that the rosin soap and barium chloride are increased as follows:

y 250 parts of rosin are added to a solution of46 parts of sodium hydroxide and 2500 parts of water and boiled to effect complete.

saponification. The free alkali in the reactionmass is thereby increased to 1.6 mols per mol of dyestufi. The barium chloride is increased to 310 'parts in order to take care of the excess rosin. The yield is approximately 498 parts of dry pigment color as com ared with 240 parts-actually obtained in a c arge prepared without-rosin soap. The increase in yield is 258 parts, the barium rosinate comprising 5 1.9 per cent of the dry pigment color.-

Example X I f The procedure is the same as that described v-1n Example VIIIexcept the rosin soap and barium chloride areincreased as follows:

350 parts ofrosin areadded to a solution of 58'parts of sodium hydroxide and 3200 parts of water and boiled to efiect complete saponification. The free alkali in the reaction mass is thereby increased to 1.6 mols per mol of dyestufi. The barium chloride is increased to 350=parts in order to take care of the excess rosin. The yield is approximately 590 parts of dry pigment color as compared with. 240 parts actually obtained in a charge without rosin'soap. The increase in yield is 350 parts, the barium rosinate comprising 59.33

per cent of the dry pigment color.

Thepigment forming azo compounds given in theabove examples belong to the group of acidic mono-azo compounds, the sodium salts of which are difiicultl'y soluble in water,

and these areparticularly adapted to'form according to our invention lakes or toners on development with roslnatesin whlch'the rosin acts as a non-diluting substratum. Specifically these compounds are the azo compounds derived from 2-naphthylamine l-sulphonic acid and beta naphthol (known in the trade as Lithol Red) and from paratoluidinemetasulphonic acid and beta-oxynaphthoic acid (known in the trade as Lithol Rubine) Although we preferably use the metallic derivatives of barium or calcium, or both, we may-also use strontium, magnesium, lead or copper or any of the metals which form substantially insoluble metallic soaps with rosin.

Although instances of the use of small amounts of rosin soap as adispersing agent are known, this invention is distinguished by the fact that we combine a substantial amount we may incorporate as little as approximate- 1y 5 per cent of rosin soap and as high as 50 per cent or even' greater proportion, the preferred range is from 15'to 30 per cent.

It will be understood, of course, that we do not intend to limit ourselves to the addition of,

the rosin soap to the azo compounds under the exact conditions specified in the foregoing examples for the reason that in some cases it ma be of some advantage in order to secure certaln tints or shades to add a portion of the rosin soap during the coupling, or at.

some other step in the process. We have found that the desired results are obtainable by the development of the metallic salt of the dyestufi in the presence of the insoluble me tallic rosinate, preferably under alkaline conditions. I

A particular advantage in the use of the pigment prepared according to our invention is in the matter of the bright glossy I rinting tone obtained therefrom. The

ronziness of the rinting tone ordinarily present in colors of this klnd is eliminated. For exam 1e, if equal parts of rosin soap lake and htho varnish of #1 grade (bodied linseed oil are-ground in the ordinary manner on a t ree roll ink mill, there is obtained a printing ink ossessing heavier body, by virtue of the big er oil absorption of the pigment, than is obtainable with a pigment made inthe ordinary manner. In place of the litho varnish, other commercial vehicles or combination vehicles may be used. The greatest superiority, however, of this ink is that the resulting printing. tone is dis- -tinc'tly superior to an ink made from an ordinary pigment, in the matter of gloss and brilliance, a property which is prethe better dispersion of the pigment with the oil. I

By the term metallic rosin soap, as used harem, we mean the metal salts of the rosin case of the alkali metals are limit ourselves to the specific embodiments thereof except as indicated in the appended claims.

We claim:

' 1. A substantially oil and water insoluble lake which comprises an insoluble metallic salt of an azo dyestufl' and from 15% to 50% of a non diluting substratumcomprising a substantiallyinsoluble metallic rosinate, said lake having'the characteristic of producing a clear, bright, non-bronzy tone.

2. A substantially oil and Water insoluble lake which comprises an insoluble metallic salt of an azo dyestufi of acidic character and from 15% to 50% of a nondiluting substratum comprising a substantially insoluble metallic rosinate inadefrom a metal of the group comprising the alkaline earth metals, copper, lead and magnesium, said lake having the characteristic of producing a clear, bright, non-bronzy tone.

3. A substantially oil and water insoluble lake which comprises the insoluble metallic salt'of an azo dyestuff and from 15% to 50% of an insoluble metallic rosinate, said lake having the characteristic of producing a clear, bright, non-bronzy tone.

4:. A substantially oil and water insoluble lake which comprises an insoluble metallic salt of an azo dyestutf and from 15% to 50% of a non-diluting substratum comprlsing an alkaline earth metal rosin ate, said lake having the characteristic of producing aclear bright, non-bronzy tone.

5. A substantially oil and water insoluble lake whichcomprises an insoluble rosinate and an insoluble metallic salt of the dyestufi obtainable by coupling beta naphthol with diazotized 2-naphthylamine I-sulphonic acid, said lake having been formed by developing it under alkaline conditions, said lake 113V.

ing the characteristic of producing a clear, bright, non-bronzy tone and said 10811121178 being present in a proportion of about 15% to 50% of the finished product.

6. A substantially oil and water insoluble lake which comprises an alkaline earth metal rosinate and an alkaline earthmetal salt of the dyestuff obtainable, by coupling beta naphthol with diazotized 2-naphthylamine 1- sulphonic acid, said lake having been formed by developing it in alkaline conditions, Sald rosinate being present in-a proportion of I about 15% to 30%. of the finished product,

and said lake having the characteristic of producing a clear, bright, non-bronzy tone.

7. A substantially oil and Water insoluble acid and heating "said lake having been formed by developing it in alkaline conditions, said rosinate being presentin a proportion of about 15% to of the finished product, and said lake having the characteristic of producing a clear, bright, non-bronzy tone.

I 9. In a process of preparing a substantially oil and water insoluble lake of an acidic azo dyestufl, the steps of combining an insoluble metallic salt of an azo dye of acidic character with an insoluble metallic rosinate in an aqueous medium, and heating the aqueous suspension of said dye salt and rosinate-in the presence of free alkali to develop the lake.

10. The process of preparing a substantially oil and water insoluble lake which produces clear, bright, non-bronzy tones, which comprises preparing an aqueoussuspension comprising an alkaline earth metal rosinate present ina proportion and an alkaline earth metal salt of the azo dyestufi' obtained by coupling beta naphthol with diazotized 2-na'phthylamine l-sulphonic the mixture in the presence of free alkali to develop the lake, said rosinate being present in the proportion of about to 50% of the finished product.

11. The process of preparing a substantially oil and water insoluble lake which produces clear, bright, non-bronzy tones, which comprises preparing an aqueous suspension comprising an alkaline earth metal roslnate and an alkaline earth metal salt of the azo dyestuff obtainedby coupling beta naphthol with diazotized 2-n aphthylamine l-sulphonic acid, but heating the mixture in the presence of at least one-halt molecular amount of free causticior each molecular amount of the dyestuft' to develop the lake, said rosinate being present in the proportion of about 15% to 30% of the finished product.

12. The process of preparing a substantiallv oil and water insoluble lake which produces clear, bright, non-bronzy tones, whlch comprises preparing an aqueous suspension comprising an alkaline earth metal rosinate and an alkaline earth metal salt of the azonlye stuff obtained by coupling beta-oxynaphthoic acid with diazotized p-toluidine-metasulphonic acid (CH SO: :NH 1:3: 4), and heating said aqueous suspension in a nonacidic condition to develop the lake, said rosinate being present in the proportion of about 15% .to of the finished product.

13. The process of preparing a substantial ly oil and water insoluble lake which produces clear, bright, non-bronzy tones, which comprises preparing an aqueous suspension comprising an alkaline earth metal rosinate and an alkaline earth metal salt of the azo dyestufl obtained by coupling beta-oxynaphthoic acid with diazotized ptolui'cline-metasulphonic acid (CH SO NH =1:3:4)', and heating the mixture in the presence of at least one-half molecular amount 'of free caustic for each molecular amount of the dyestufi to de 'velop the lake, said rosinate being present in the proportion of about 15% to 30% of the finished product.

In witness whereof, we afiix oursignatures.

EDWARD R. ALLEN. ALFRED SIEGEL.