DE1419360B2 - - Google Patents

Description

Substituted amnionium radical means, have not included, incorporated.

Able to improve the bleaching effect of persalts at low temperatures. Under the expression 30 can be used, depends on various factors, such compounds are understood, the most important of which are: the moisture, which is more correctly referred to as peroxyhydrate, the activity content of the agent, in which the stabilized reactant and K. ristall Contain hydrogen peroxide, which should be used in the window capable of movement, and which dissolve the substances in water is released. Examples of relative humidity and temperature at which these substances are the alkali metal perborates and percarbonates, perpyrophosphates and persilicates containing the stabilized reactive ester. Bleach should be stored. In general, the bleaching action in aqueous solution of esters is desirable that the moisture content of the bleaching is of the above kind in connection with persalts and by means of the invention should be below 10%, and the other usual ingredients, if desired, such as storage conditions including the moisture sodium pyrophosphate, in the Belgian patent 40 permeability of the containers used should such '49 817 previously described. In the case of esters the general rule that the agent does not absorb large amounts of water from my formula CH ₃ CO · O · R · SO ₃ M is the lead atmosphere. However, agents with a suitable agent at low temperatures peracetic- greater water content or under conditions acidic (CH ₃ · CO ₃ H), formed by perhydrolysis of the stores, under which they are relatively large esters. 45 absorbing amounts of water can be satisfactorily incorporated into them. It has been found that if this reactive manner would be stabilized by the addition of greater amounts of capable ester in persalt-containing detergent powders than would otherwise be required, they are incorporated, and to a lesser extent. Moreover, the amount of Stabilidas Persalz itself seems to tend to decompose on standing, not the degree of stabilization, but that when noticeable amounts of moisture over a period of time, for which the agents or the surrounding atmosphere are essentially completely stabilized is caused to affect. So can be. This decomposition occurs even if the quantities of only 1 ° / ₀ of the stabilizer, based on the reactive Este; present in separate particles by weight of reactive ester, for short storage and no liquid water present. In the case of the times being effective during storage times (2 or 3 months) for normal commercial esters sodium and potassium acetoxy 55 amounts up to benzenesulfonate, the decomposition during the 100%> based on the weight of the reactive storage of an undesirable discoloration can be - Esters, may be desirable. Preferably will be slides. about 15 to 60% de ^c under normal conditions. It has now been found that this decomposition can be reduced, based on the weight of the reaction, when used with the reactive 60 capable ester.

Esters intimately combine a non-volatile material The stabilizer should be intimately involved with the reactive

which has a pH of 2.5 to 8, measured in capable esters, and this is suitably

a 1% aqueous solution, possesses and reacts in a manner that causes a mixture of

capable in the manner of an acid with a strongly alkaline inside, both in finely divided form, in grains

Substance is. Under a strongly alkaline substance 65 results. The grain can, for example, under

is understood to mean a pH measured by adding a small amount of a volatile liquid

in 1% aqueous solution, speed of 9.5 or above, z. B. water, and mechanical processing takes place-

^v "* ^{c! t} ' ^t find, after which the liquid is subsequently

1 418360

tubs is driven off. Instead, the graining can also be carried out by mechanical processing of the mixture of ester and stabilizer with a non-volatile binder, which does not directly impair the effect of the ester, does not fundamentally interfere with the effect of the stabilizer and has no adverse effect on the agents in which the ester is to be used. Suitable binders are the monoethanolamides of fatty acids, for example fatty acids from coconut oil, but other neutral and non-reactive substances with suitable physical properties can also be used. Granulation can also be effected by making an aqueous solution or slurry of the ester? and the stabilizer and spray drying the solution or slurry by known methods. Other non-deleterious impacts can be included in du-grains if desired, for example neutral salts such as sodium sulfate.

The particle size of the granules containing the reactive ester and stabilizer is proportionate irrelevant for the stability of the ester. The particle size can be any suitable for incorporation be in the bleach of the invention. Although very fine grains (for example through a sieve with openings with a side length of 251 microns) tend to become more stable than coarser grains lose, this effect is hardly pronounced, and because the usual graining processes relatively little To deliver material of this particle size, there is normally no need to screen out this fine material, to get satisfactory results.

The bleaching agents according to the invention can in addition to the stabilized reactive ester and a persalt contain other common ingredients of bleaching agents, in particular they can be surface-active Contain compounds and other common ingredients of detergents, e.g. B. water-soluble condensed phosphates, carbonates and silicates and thus stabilized, at low temperature form bleaching detergents.

The invention is illustrated by the following examples in which parts and percentages are by weight are, "sodium p-acetoxybenzoisulfonate" is a commercially available one Material and "sodium perborate" is commercially available sodium perborate tetrahydrate.

example 1

50

This example illustrates the use of sodium p-acetoxybenzenesulfonate, stabilized by the incorporation of disodium dihydrogen pyrophosphate in a detergent that bleaches at a low temperature.

A spray dried powder base of the following composition was used:

Parts by weight

Sodium dodecylbenzenesulfonate 20

Coconut oil fatty acid ethanolamide 2.5

Alkaline sodium silicate 6

Sodium carboxymethyl cellulose (60%) x x 1

Sodium tripolyphosphate 32

Sodium sulfate 10.5

Water, optical brighteners etc 8

The unstabilized sodium acetoxybenzenesulfonate used was a material which, by processing with 6% of its weight of coconut oil fatty acid monoethanolamide, was granulated and sieved to remove most of the fines. The stabilized sodium acetoxybenzenesulfonate was prepared by spray drying and contained 50% disodium dihydrogen pyrophosphate and 17% sodium sulfate, based on the weight of the acetoxybenzenesulfonate. It included about 20% material that passed through a 251 micron screen. In each case, an amount of product equal to 12 parts of sodium octoxybenzenesulfonate along with 8 parts of sodium perborate was added to 80 parts of the base powder.

The powders were stored in three samples in layered cardboard boxes, of the kind used as containers for common detergents, in warehouses set at 20 ° / 90 ° / ₀ relative humidity (RH) and 28/70%. r. V. were held. The contents of each carton were then analyzed for sodium acetoxybenzenesulfonate content.

The percentages of sodium acetoxybenzenesulfonate decomposed in each of the indicated times were the following:

Table I.

Type of sodium acetoxybenzenesulfonate

Storage at

20'790 ° / o r. F. | 28770% r. F.

8 I 14 8 I 20

Unstable & balanced
Stabilized ...

Weeks

32

Weeks

The results show that a low temperature bleaching detergent according to the invention is remarkably superior to that in terms of stability is the same in which the reactive ester has not been stabilized according to the invention.

Example 2

This example illustrates that in the low temperature bleaching detergent of the invention the stabilization of finely divided reactive ester is particularly noticeable. J is.

A spray-dried mixture of sodium acetoxybenzenesulfonate, containing, on an anhydrous basis, 30 percent by weight disodium dihydrogen pyrophosphate and 10 weight percent sodium sulfate, and with a water content of 6.5%, was divided into three fractions. The first fraction was that passing through a sieve with square openings of 251 microns, the second fraction was passed through a sieve with square openings of 353 microns, however did not pass through the first sieve, and the third fraction did not pass through the second sieve, but passing through a sieve with square openings of 699 microns. Not through that material passing last sieve was discarded.

Sodium acetoxybenzenesulfonate was granulated with water, in a trough to a water content of 1.5% dried and finally divided into three equal portions.

Each of the servings of the trough dried acidic pyrophosphate containing sodium acetoxybenzenesulfonate was mixed with perborate and a base powder to make a low temperature bleaching To give detergent, and the storage test as in Example 1 subjected.

Table II Sodium Acetoxybenzenesulfonate (NABS) Particle size

(Size of the sieve openings

in microns)

% Decomposition in the powders after 4 weeks of storage at

20790% r. F. NABS I perborate

28770 / r. F. NABS I perborate

Spray dried with 30% Na ₂ H ₈ P ₈ O ₇
(6.5% water)

Grained with water and trough-dried
(1.5% water)

699/353

353/251

going through 251

699/353

353/251

going through 251

1.5

27
69

5 8 6

6 13 27

0 0 3

12 20 64

10

10.5

12th

35

The figures for the decomposition of the sodium acetoxy- the fraction with the finest particle size despite higher

Benzenesulfonate and perborate are used in the fore-water content. The stability rfes according to the invention

given table. stabilized sodium acetoxy uenzenesulfonate will only

The results show that the agents output very little due to fluctuations in particle size

are conspicuously superior, especially with respect to 20 impaired.

Claims (1)

The invention therefore provides a bleach powder Claim: with a content of a persalt and a reactive ester of the general formula Bleach powder with a content of _ap "_ .. Persalt and a reactive ester of all- 5 CH ₃ CU · υ · κ · au ₃ M, common formula CH ₃ CO · O · R · SO ₃ M, where R an unsubstituted or substituted phenyl in which R is a substituted or substituted phenyl radical and M is an alkali metal, ammonium or nylradikal and M is an alkali metal or a given denotes a substituted ammonium radical, d also denotes substituted ammonium radical, characterized in that it is a mono- or dialkali Monoalkali dihydrogen orthophosphate, a dialkali dihydrogen pyrophosphate or di- or trialkalisaize dihydrogen pyrophosphate or di- or trialkali- the ethylenediamine acetic acid as a stabilizer for the contains salts of ethylenediaminetetraacetic acid as stabilizing reactive esters, Sator for the reactive ester contains Sodium acid pyrophosphate is a well-known one 15 stabilizer for solutions of persalts, C. h. for the stabilization of hydrogen peroxide, which from the persalts is released. If the erfindungsgc If agents are dissolved in water, the bleaching agent is not hydrogen peroxide, but per- The invention relates to the stabilization of λο acetic acid, which by perhydrolysis of the reaction -, - white reactive esters in bleaching powders. capable ester is formed. The stability of the Peres ^ - Esters of the general formula acid do not pose a problem. No benefit would be expected or would result from the presence CH ₃ CO · O · R · SO ₃ M, from acidic pyrophosphate in solution. The acidic pyro s5 phosphate is included in the solid mixtures because of its wherein purely unsubstituted or substituted phenyl-stabilizing effect on the reactive radical and M an alkali metal, ammonium or sub-ester, these are compounds which have a per bond