DE2113834A1 - Process for the production of slurries of optical brighteners from the group of triazines - Google Patents

Description

Dr. F. Zumstem sen. - Di. E. Assmann Dr.R.Koenigsberqor - DIpI. "ii./s. R. Hol-bauer _Ä - - _{Ä Ä A.}

8 Munich 2, Bräuhausitraß 4 / Ul

CIBA-GEIGY AG 1-3280 / 3349 / Ma 1431/45

CH-4002 Basel / Switzerland

Process for the production of slurry insulation from optical brighteners from the group of triazines

The present invention relates to a process for the production of slurry lamellations of optical brighteners from the group of Triazines.

Optical brighteners from the triazine range are often in the form of a dry powder is used, which hergestallt from the moist filter cake which, after being transferred to dishes, was predried in ovens for several hours. Because of the difficulties in handling the dry powder and because of the risk of dust, it would be advantageous to use the brightener in the form of a aqueous slurry. Attempts have been made to Slurry the dry powder and also the moist filter cake by mixing with water, but these were Unsuccessful attempts because the resulting slurry is not homogeneous, tends to settle out quickly and the rebound properties as well as the cold water coloring behavior are adversely affected. Furthermore, the slurry prepares a dry Powdery great difficulties

It has now surprisingly been found that homogeneous, thixotropic Aufsehlämmungen such brighteners can be produced by their moist filter cake with a dispersant mixed. Such slurries settle during the static storage is hardly affected, as they form a gel-like shape and therefore no noticeable sedimentation during long periods of static Storage, e.g. for 12 weeks, occurs. Additionally

1 09343 / 18AO

In addition to the good sedimentation behavior, the slurries have viscosity properties that make them much lighter than would be the case for a powder form. Such slurries can come out of the storage containers due to be taken by gravity or by means of pumps, with a dust hazard, as in the. Powder form occurs, does not exist is. Furthermore, there is no deterioration in the pick-up properties or the cold-water dyeing properties if these Materials can be incorporated into a spray dried detergent.

Slurries according to the invention v / earth obtained by the moist filter cake of a compound of the formula

NH- / V- CH = CH 'SO ₃ M "

wherein X and Y, which may be the same or different, one mono- or di-substituted amino or alkoxy group, and M denotes hydrogen, an alkali metal or an amine salt, in one Amount of 15-60% by weight based on the total weight of the slurry with a dispersant to form a thixotropic "slurry mixed, which does not noticeably settle on static storage and a Brookfield viscosity of 200 to Has 10,000 centipoise at 6 rpm to 2,000 centipoise at 60 rpm.

When the concentration of the compound present in the slurry of the general formula I is too high, the slurry can change in the sense of a reverse thixotropy, what leads to difficulty in pumping the slurry. This difference can be achieved by diluting the slurry with water or an aqueous electrolyte. However, when the concentration 2u is low, the sedimentation stability becomes poor achieved.

109843/1840

BAD OBiOiNAi.

The desired content of the compound of the general formula I. in the slurry can either by adding water, aqueous electrolyte, slurry or further dry powder to it adjusted to the moist filter cake. This setting can be made before, during or after the addition of the dispersant will. The proportion of the compound of the formula I is expedient 20 to 60%, preferably 20 to 40% by weight, based on the Weight of the slurry.

The slurry is then mixed with the dispersant until it becomes homogeneous. Mixing can be done, for example, with the help of a homogenizer guide device are carried out.

Thixotropic slurries according to the invention are accordingly marked e i t through:

a) a content of 15 to 60 parts by weight 7 _O, based on the total weight of the slurry of an optical AuFnellers of formula

where X and Y ,, which can be identical or preceding, denote a mono- or di-substituted amino or alkoxy group, and M denotes a hydrogen atom, an alkali metal or a Amine salt means

b) a content of 0.1 to 5% by weight, based on the total weight the slurry of a dispersant, and

c) a Brookfield viscosity of 200 to 10,000 centipoise

6 rpm and up to 2000 centipoise at 60 rpm. Preferably included such thixotropic slurries optical brighteners of the following formulas:

SO ₃ M SO ₃ M

109843/1840

wherein X ₁ and Y-, which can be identical or different, a phenylamino group, optionally mono- or di-substituted by alkyl radicals having 1 or 2 carbon atoms, the morpholino _T no group, an alkylamino group having 1 to 4 carbon atoms, an alkoxy group with Are 1 to 4 carbon atoms, and M is hydrogen, an alkali metal or an amine salt.

^X 2 "r ^" ^NO

N \ ^ N

Y,

CH = CH

ΑΛ. »

nh

(in)

SO ₃ M

where X «and Υ«, which can be identical or different, a Phenylamino, morpholino, the N-methyl-N-ethanolamino group and M denotes hydrogen, an alkali metal or an amine salt.

SO ₃ M

wherein X, and Y, which can be identical or different,. the morpholino or the N-methyl-N-ethanolamine group and M hydrogen, mean an alkali metal or an amine salt.

-CH --- CH

NH-f

wherein M denotes hydrogen, an alkali metal or an amine salt, in the case of this optical brightener it is expedient to have a content from 4 to 25 weight percent based on the total weight of the slurry is present on a strong electrolyte.

Under conditions of static storage, the thixotropic form

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Slurries of gel-like shapes, which are easily wiader by stirring can be liquefied. This reduces the viscosity so that it is possible to pump or drain the slurry to be taken from the containers.

The dispersant can be an anionic, cationic or nonionic surfactant. Examples of suitable ones Dispersants are the following:

The sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde.

Dibutylnaphthalenesulfonic acid sodium salt.

The condensation product of caprylic wax and ethylene oxide.

A mixture of cyclohexanol and stearic acid amide.

The sodium salt of a sulfonated oil.

Bis (2-hydroxyethyl) tallow amine oxide.

Mono-fatty acid or resin acid esters of polyoxyethylene glycols.

Amphoteric N-coconut-ß-amino-butyric acid.

A polymer made from mixed propylene / ethylene oxides.

An organic »crystalline water-soluble wax or the Nat ritunhalb s al ζ.

Non-ionic long-chain polyoxyethylene ether condensates.

The amount of dispersant that is added to the wet filter cake weight, expediently 0.1 to 5 parts by 7 _O, based on the weight of the moist filter cake. The proportion of the dispersant is preferably in the range from 0.5 to 2% by weight, based on the weight of the moist filter cake.

If desired, a gelling agent can also be added to the slurry. Examples of gelling agents are carboxyvinyl polymers, highly processed magnesium silicate, magnesium montmorillonite or finely divided pure silica. The amount of gelling agent that is added may vary, it is usually in the range of 0.1 to 2 wt .-%, based on the weight of the moist filter cake, preferably in a range of 0.1 to ^{1 wt '-%} * 100843/1040

If desired, an electrolyte can be added to the slurry. The electrolyte can be sodium chloride, sodium sulfate, Be sodium carbonate or one of the corresponding potassium salts. The amount of electrolyte can be 4 to 25 wt .-%, based on the Total weight of the slurry, preferably 5 to 20% by weight, be.

Compounds in which the presence of an electrolyte is particularly is advantageous, correspond to the following formulas:

-CII = CH J

SO ₃ Na SO / a ^N

-CH = CH
SO ₃ Na

SO ₃ Na

N (CH ₃ ) CH ₂ CH ₂ OH

.N (CH ₃ ) CH ₂ CH ₂ OH

The addition of electrolytes to a slurry of crystalline The form of a compound of the formulas II or III brings about an improvement in the appearance of spray-dried detergents in which such slurries have been incorporated.

Furthermore, the cold water coloring properties can be improved by subjecting the slurry to grinding treatment because the cold water coloring properties depend on the specific surface area of the particles depend.

The milling treatment has proven particularly useful when using the compound of formula II shown as valuable. Good water coloring properties can be achieved when the majority of the particles

10 9843/1840

in the slurry a particle size of 5 to 20μ., preferably 5 to 10 μ.

The viscosity of the slurry depends on the concentration and the specific surface area of the particles. At 6 revolutions per minute, the Brookfield viscosity is preferably 300 up to 5000 centipoise and at 60 revolutions per minute preferably about 50 to 1000 centipoise.

The homogeneous slurry thus prepared can, if desired be diluted or concentrated as required.

The inventive preparation of an aqueous slurry has the advantage over you. that the compounds of formula I brought into an application form which are suitable for immediate use, using otherwise necessary process steps. Simultaneously a low product loss is achieved. The inventive Slurries can last for several weeks, e.g. 12 weeks or longer, without noticeable sedimentation during storage and without deterioration the properties are preserved. The slurry can then be incorporated into a detergent e.g. by flowing the required amount of the slurry from a container into a mixer, which is a slurry of the detergent or detergent contains.

The present invention accordingly also relates to a process for the production of detergent compositions, as well as the one obtained thereafter of detergents, characterized in that a slurry for * detergents common detergents with a thixotropic slurry of brighteners, mixed and dried. The suspension mixtures obtained are advantageously dried, by subjecting them to a spray drying process.

The following examples are intended to further illustrate the present invention. Parts by weight are in the same ratio to parts by volume like kilograms to liters. Parts and percentages are based on weight.

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example 1

0.75 part of the condensation product of naphthalenesulfonic acid and formaldehyde were added to a wet filter cake containing 66.5 parts of water, 0.75 parts of sodium chloride and 32.0 parts the amorphous compound of formula III contained.

This mixture was first mixed by hand and then homogenized with a mixing device (Silverson mixer). The Brookfield viscosity range of the slurry was 3000 centipoise at 6 rpm and 510 centipoise at 60 rpm.

in Table I is the sedimentation stability of the slurry for the range of 12 weeks ". From this table it can be seen that no noticeable sedimentation during this period entered. At the end of this period the slurry was agitated and then easily released using gravity or removed from the container by pumping.

Table I.
Sedimentation stability in a one-ton container.

Elapsed time in
Weeks Solids content % Above center Below 0
4th
8th
12th 33.2
31.2
32.2
31.3 33.4
35.4.
32.6
33.6 33.3
33.0
33.5
34.0

This slurry had the same application properties as the normal dry powdery material with regard to the optical brightening behavior at different temperatures.

109U3 / 1840

Example 2

0.4. Parts of the sodium salt of the condensation product of naphthalenesulfonic acid and 0.5 part of magnesium silicate (hand product "Benaquee") were added to a moist filter cake, the 64.1 parts of water and 35.0 parts of a compound of the formula IV

NH- ^ V-NH "^

(IV)

NHC ₆ H ₅

contained.

The mixture was mixed first by hand and then with homogenized using a mixing device (Silverson mixer). The Brookfield viscosity range of the slurry was 5000 Centipoise at 6 rpm. and 750 centipoise at 60 rpm.

in Table II is the sedimentation stability of the slurry given for a period of 12 weeks. From this table it can be seen that no noticeable Sedir mentation occurred. At the end of this period, the slurries were agitated and then easily moved by gravity or removed from the container by pumping.

Table II

Sedimentation stability in a one-ton container.

Elapsed time in
V / o just Solids content% center Below 0 Above 35.4 35.7 4th 35.6 35.7 35.8 8th 35.1 34.6 36.0 12th 33.0 34.9 35.8 33.5

109843 / 18A0

to

example

1 part of the sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde (commercially available product "Belloid TD ^'r), was added to a moist filter cake, of 61.6 parts of water, 0.1 part of sodium chloride and 38.3 parts of a compound of the formula II contained.

60 parts of a 10% sodium chloride solution in water were used added and the whole thing mixed by hand and then homogenized with a mixer (Silverson mixer). Then were Mill 1500 parts of the slurry with 1500 parts of Ballotini beads (3 mm diameter) in a bead mill for 2 hours. After the Ballotini beads were separated, the viscosity of the slurry was 2600 centipoise measured at 6 rpm with a Brookfield viscometer. The slurry did not noticeably settle over the course of 12 weeks.

Table III
Sedimentation stability in a one-ton container

Elapsed time in
Weeks Solids content % Above center Below 0
4th
8th
12th 24.0
24.5
24.5
24.2 24.0
25.5
25.7
25.5 24.0
25.9
25.7
25.2

Bead milling the slurry improved the cold water staining process from 144 units to 257 units (standard specification: 260 units).

In Table III is the sedimentation stability of the slurry indicated for 12 weeks. After the 12th

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The slurry has been stirred for weeks, then it can be easily taken with it Can be removed from the container by gravity or by pumping.

This slurry shows the same whitening property at normal temperature like the normal dry powdered material.

Example 4

1 part ^ of the sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde (commercial product "Belloid TD"), was added to a moist filter cake that was 75.3 parts Water, 12 parts of sodium chloride and 23.7 parts of a compound of formula II.

The whole thing was mixed by hand and then with a mixer (Silverson mixer) homogenized. The viscosity of the slurry was 2100 centipoise at 6 rpm as measured by a Brookfield viscometer. The slurry did not noticeably settle over the course of 12 weeks.

Table IV
Sedimentation stability in a one-ton container

Elapsed time in
Weeks Solids content% Above center Below 0 52.2 52.2 52.2 4th 52.0 51 Λ 52.0 8th 52.0 52.2 52.6 12th 55.2 35.9 54.0

In Table IV is the sedimentation stability of the slurry reported over a period of 12 weeks. At the end of the 12 weeks the slurry was stirred, it can then be easily removed from the container by gravity or by pumping.

10884 3/18 AO

This slurry shows the same whitening properties at normal temperature as the normal dry powdered material.

Example 5

1 part of the sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde was added to a moist filter cake containing 57 parts of water, 7.7 parts of sodium chloride and 35.3 parts of a compound of formula III contained.

This mixture was first mixed by hand and then homogenized with a mixer (Silverson mixer). The Brookfield viscosity range of the slurry was 5140 centipoise at 6 rpm and 700 centipoise at 60 rpm. No sedimentation had occurred after 73 hours.

Example 6 to 8

The same procedure as described in Example 5 was followed, but with the addition of 0.125, 0.25 and 0.5 parts, respectively a highly processed magnesium silicate as a gelling agent. The viscosity of the slurry and the sedimentation times are given in Table V.

Table V

example Parts
Gelation
middle Viscosity range
(6 to 60 rpm)
(Centipoise) The slurry
did not sit down
noticeably from: 6th
7th
8th 0.125
0.25
0.5 5380/730
5520/330
7300/1070 12 weeks
12 weeks
12 weeks

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/ 3

The sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde was added to a moist filter cake, of the 63.5 parts of water, 0.3 parts of 2Tatriunarbonat and 36.2 Parts of a compound of formula II contained.

In Examples 9 and 10, a highly refined magnesium silicate was used was used as a gelling agent, and in Example 12 a specially prepared magnesium monomorillonite was used as a gelling agent used. The slurry was first mixed by hand and then homogenized with a mixing device (Silverson mixer). The amounts of additives used and the sedimentation time are given in Table VI.

Table VI

example Share Disper
greed Share gelation
middle The Aufschlärajnurjg-
did not sit down
noticeably from: 5 0.8 0.2 12 V / o s 6th 0.8 0.5 12 weeks 7th 1.0 - 12 weeks 8th 1.0 0.25 12 weeks

This slurry had the same whitening properties Normal temperature like the normal dry powdered material.

Example 13

Part of the sodium salt of the condensation product of naphtha linsulfonic acid and formaldehyde (commercial product "Belloid TD"), was added to a moist filter cake containing 53.4 parts of water, 0.2 part of sodium chloride and 46.4 parts of a compound of Formula V

109843/1840

contained.

This mixture was first mixed by hand and then homogenized with a mixer (Silverson mixer). The viscosity range of the slurry was 6900 centipoise at 6 rpm and 971 centipoise at 60 rpm. After 12 weeks it was no sedimentation occurred.

If 1 part of the sodium salt of a specially sulfonated oil was used in place of the dispersant used above, a homogeneous slurry was obtained.

This slurry shows the same whitening properties at normal temperature like the normal dry powdered material.

Example 14

0.6 part of a polymer of mixed propylene / ethylene oxides and 0.5 part of a highly processed magnesium silicate were added to a moist filter cake containing 56.1 parts of water, 0.1 part of sodium chloride and 43.8 % of a compound of the formula IV contained. This mixture was mixed by hand and then homogenized with a mixer (Silverson mixer). No sedimentation had occurred after 12 weeks.

This slurry had the same application properties as the normal dry powdered material in terms of whitening properties. at different temperatures ..

109843/1840

Example 15

2.5 parts of the sodium salt of the condensation product of Ttflphthalinsulfsonic acid and formaldehyde, commercially available under the name "Belloid TD", were added to 250 parts of a moist filter cake containing 96 parts of the compound of formula II and to this mixture were added 2JO parts by volume of one 10% w / v sodium chloride solution. The mixture was mixed initially by hand and then homogenized with a mixer (Silverson mixer). Then 300 parts of this slurry were placed in a precise amount in a ball mill which was operated at 29 revolutions per minute for 24 hours. A white pourable slurry was obtained which did not noticeably settle in the course of 12 weeks and whose cold water coloring properties were significantly improved compared with the same product which had not been subjected to any grinding treatment. The cold water coloring properties were determined as follows:
In aluminum bowls were exactly weighed:

(a) 0.0070 g of a pure compound of the formula I (100% standard)

(b) a weight of a slurry of the compound of formula I equivalent to 0.0070 g of the 100% standard product, calculated on the basis of the spectrophotometric intensity.

With a launderometer set at 25 ° C, were the dye liquors prepared as follows:

The required number of dye liquors were in the launderometer given dish and 500 ml of a solution containing 4 g per liter of a brightener-free V / ash agent, and 12.0 g sample made from bleached non-mercerized cotton sateen put in each bowl.

These dye liquors were preheated to 25 ° C and the aluminum dish containing the sample was floated on the liquor left and the dye liquor carefully sealed in the container.

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All dye liquors were shaken simultaneously, and in the Launderometer moved for exactly 10 minutes. After stirring, the dye liquors were removed from the launderometer and the Swatches rinsed in cold running water. The excess water was separated off in a centrifugal dryer.

The specimens were stretched out on pin frame and placed in a drying oven at a temperature of? 0 ° C for about 5 minutes and then removed from the pin frame and allowed the samples during at least 2 hours, at the temperature of 20 ⁰ C and a relative humidity adjust by 65 %.

The patterns were then folded in half with the satin side out.

Using the Harrison fluorimeter, total fluorescence was measured (with filter 2) and the average of 5 readings taken from each side was averaged.

The approach (a) and approach (b) should have the same cold water dyeing property exhibit. The comparison of the viscosity and the cold water color before and after grinding is in the Table VII given.

sample Brookfield viscosity
(cps) (6-60 rpm) XaI tv; a s s er coloring default Before the ver
grind
According to the Ver
grind 1080 - Ay?
305-65 approach 262
262 16?
260

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Claims (1)

Claims 1. A method of making a slurry containing 15 "up to 60% by weight, based on the total weight of the slurry, a compound of the general formula I. CH = CH SO ₃ M Y contains, wherein X and Y, which may be the same or different, one mono- or di-substituted amino or alkoxy group, and M is hydrogen, mean an alkali metal or an amine salt, characterized in that the in the preparation of this compound obtained moist filter cake mixed with a dispersant so that the resulting slurry is thixotropic and does not settle noticeably on static storage and a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise. at 60 rpm. 2. The method according to claim 1, characterized in that the slurry 20 to 40 wt .-% of a compound of the general Formula I based on the total weight of the slurry contains. 5- The method according to claim 1 or 2, characterized in that that the dispersant is the sodium salt of the condensation product of naphthalenesulfonic acid and formaldehyde. 4 ·. Method according to one of the preceding claims, characterized in that the amount of dispersant is 0.5 to 2.0% by weight, based on the weight of the moist filter cake, amounts to. 5. The method according to any one of the preceding claims, 109843 / 18AO eat characterized in that the Brookfield viscosity is 300 to 5000 centipoise at 6 rpm and 50 to 1000 centipoise at 60 RPM is. 6. The method according to any one of the preceding claims, characterized characterized in that a.Gelling agent to the slurry is given. 7. The method according to claim 6, characterized in that the gelling agent is highly processed magnesium silicate. 8. The method according to claim 6 or 7, characterized in that the amount of gelling agent 0.1 to 2.0 Gev. ^r .-%, based on the weight of the moist filter cake. 9. Process according to one of the preceding claims, characterized in that 4 to 25% by weight of a strong electrolyte, based on the total weight of the slurry are. 10. The method according to claim 9 »characterized in that that the electrolyte is sodium chloride. II / thixotropic slurry characterized by: a) a content of 15 to 60 wt .-%, based on the total weight the slurry of an optical brightener of the formula viorin X and Y, which can be the same or different, denote a mono- or di-substituted amino or alkoxy group, and M denotes a hydrogen atom, an alkali metal or a Aminsalζ means b) a content of 0.1 to 5% by weight, based on the total weight the slurry of a dispersant, and 109843/1840 c) a Brookfield viscosity of 200 to 10,000 centipoise " 6 rpm and up to 2000 centipoise at 60 rpm. 12. Thixotropic slurry characterized by: a) a content of 15 "to 60% by weight, based on the total weight the slurry on an optical brightener of the formula: (II) SO ₃ M where X ^. and Y _x ., which can be identical or different, a phenylamino group, optionally mono- or di-substituted by alkyl radicals having 1 or 2 carbon atoms, the morpholino group, an alkylamino group having 1 to 4 carbon atoms which can be substituted by hydroxyl radicals, a Mean alkoxy group with 1 to 4 carbon atoms, and M represents hydrogen, an alkali metal or an amine salt •, b) a content of 0.1 to 5% by weight, based on the total weight the slurry of a dispersant and c) a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm. Thixotropic slurry, characterized by a) a content of 15 to 60% by weight, based on the total weight the slurry on an optical brightener of the formula: 109843/1840 where Xp and Yp, which can be the same or different, the phenyl amino group, the ho rpho lino group, an alkylamino group with 1 to 4 carbon atoms represented by hydroxyl groups may be substituted, and M denotes hydrogen, an alkali metal or an amine salt, b) a content of 0.1 to 5% by weight, based on the total weight the slurry on a dispersant, and c) a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm. 14. Thixotropic slurry characterized by: a) a content of 15 to 60% by weight, based on the total weight the slurry on an optical brightener of the formula: A / -CH = CH- / V > == / i J (IV) OM SO ₃ M SO ₃ M where X and Y ₇ , which may be identical or different, denote a phenylamino, morpholino, N-methy 1-N-athanolamino group and M denotes hydrogen, an alkali metal or an amine salt, b) a content of 0.1 to 5% by weight, based on the total weight the slurry on a dispersant, and c) a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm. 15 · Thixotropic slurry, characterized by a) a content of 15 to 60 wt .-%, based on the total weight the slurry on an optical brightener of the formula: 109843/1840 wherein X ₁ , and Y ^, which can be identical or different, the morpholine or the N-Hethyl-N-äthaiiolaminogruppe .and M hydrogen, an alkali metal or an amine salt ", b) a content of 0.1 to 5 % by weight, based on the total weight of the slurry, of a dispersant, and c) by a content of 4 to 25 Gev ^,? % of a strong electrolyte based on the total weight of the slurry and that has a Brookfield viscosity of from 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm. 16. Thixotropic slurry characterized by: a) a content of 15 to 60 wt .-%, based on the total weight the slurry on an optical brightener of the formula: ~ ^{ch = ch} SO ₃ M wherein M is hydrogen, an alkali metal or an amine salt, b) a content of 0.1 to 5% by weight, based on the total weight the slurry, on a dispersant, c a content 4-25 Gev .-% _t) based on the total weight of the slurry to a strong electrolyte, and d) through a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm. 17 · Thixotropic slurry according to claims 12 to 16, characterized by a content of 20 to 40% by weight, based on based on the total weight of the slurry, on an optical brightener. 109843/1840 18. Thixotropic slurry according to claims 11 to 17i characterized in that the dispersant is the sodium salt of the condensation product of ITaphthalenesulfonic acid and Is formaldehyde. 19. Thixotropic slurry according to any one of the preceding Claims, characterized in that the Brookfield viscosity 300 to 5000 gentipoise at 6 rpm and 50 to 1000 centipoise at 60 TJpM. 20. Thixotropic slurry according to any one of the preceding Claims, characterized by a content of 0.1 to 2.0% by weight, based on the total weight of the slurry a gelling agent. 21. Thixotropic slurry according to claim 10, characterized in that the gelling agent is magnesium silicate. 22. Thixotropic slurry according to claim 14 · and 15 *, characterized in that the electrolyte is sodium chloride. 23 · Method of preparing a slurry that 20 Contains up to 60% by weight, based on the total weight of the slurry, of a compound of the general formula I, characterized in that that the moist filter cake obtained in the preparation of this compound is mixed with a dispersant, so that the resulting slurry is thixotropic and does not settle noticeably on static storage, and a Brookfield viscosity of 200 to 10,000 centipoise at 6 rpm and up to 2000 centipoise at 60 rpm on v / eist. 24. A process for the preparation of a slurry which contains 15 to 40 Geiei .-% _r, based on the total weight of the slurry, of a compound of the formula II, characterized in that the moist filter cake obtained in the preparation of the compound is obtained contains at least 4% by weight of a strong electrolyte, based on the total weight of the filter cake, mixed with a dispersant and the slurry is then subjected to a major treatment. 109843/1840 25. Process for the production of detergent compositions, characterized in that a slurry for detergents common detergents with a thixotropic slurry of Brighteners as defined in any one of claims 11 to 22, mixed and dried. 26. The method according to claim 25, characterized in that the slurry mixture is a spray drying process subject. 27. Detergent produced according to claims 25 and 26. FO 3.31 / Sc / pm
March 19, 1971 109843/1840