JPH01170695A - Stable detergent containing fluorescent brightener - Google Patents

Abstract

PURPOSE: To obtain a detergent which is storage-stable and suitable for washing white and colored fiber materials by blending a peracid (salt) and a bis- benzofranyl fluorescent whitening agent.

CONSTITUTION: This detergent is obtained by admixing (A) 0.5-30% of a inorganic or organic peracid or its mixture (preferable example: a 6-12C diperoxydicarboxilic acid), and (B) 0.03-0.5% of bis-benzophanyl fluorescent whitening agent (mixture) shown in the formula (M is H, non-coloring cation, etc.; n is 2-4). This detergent is suitable for washing at 20-60°C.

COPYRIGHT: (C)1989,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides storage-stable optical brighteners containing, in addition to at least one peracid or a salt of a peracid, at least one specific optical brightener of the bis-benenfuranyl type. Detergents, processes for their production and their use for washing textiles.

The proportion of synthetic or mixed fiber materials in m* fabrics produced today is increasing. It is also desired that colored laundry does not need to be washed separately. For these reasons, and as a means of saving energy, many countries wash clothes at lower temperatures than 90-95°C or boiling temperatures. This requires that perborate, which acts as a bleaching agent, conventionally contained in detergents, be activated by an auxiliary substance, such as tetraacetylethylenediamine (TAED), which can be used at washing temperatures of 60 to 80°C. This means that a bleaching effect of 1° must be achieved. At wash temperatures even lower than this, the use of such over-drunk/activator systems no longer gives satisfactory results.

For this reason, detergents containing stronger bleaching agents, such as peracids, were once proposed (West German Patent Publication No. 275).
6583, European Patent Publication No. 145438, British Patent No. 2141754, British Patent No. 2141755, US Patent No. 4028263 and British Patent No. 59272
(see issue). These new bleaching agents have the advantage of exhibiting a good bleaching effect even at temperatures as low as 20"C, but on the other hand, they have the disadvantage of destroying the optical brighteners normally contained in detergents. there were.

Now, according to the present invention, it has been discovered that certain bis-benzofuranyl compounds have excellent stability even in detergents containing strong bleaching agents such as those mentioned above. Under average storage conditions and under enhanced conditions (temperature 3
Even at temperatures above 0°C and atmospheric humidity above 60%, this particular subenzofuranyl optical brightener is completely stable in detergents for several months, or at best has a quality that does not pose any practical problems. It only causes a decline.

That is, the present invention uses 0.5 to 30% of an inorganic or organic peracid or peracid mixture or persalt mixture and 0.03 to 0.5% of an optical brightener or optical brightener mixture.
With respect to storage-stable detergents containing, as optical brighteners, the detergents of formula (I), where M is hydrogen or one equivalent of a non-chromogenic cation, n
is 2 to 4, and the compound of formula (1) further contains halogen, Cl-04-alkyl or CtC
(optionally substituted with a 4-alkoxy group R).

M in formula (1) can be, for example, an alkaline earth metal such as magnesium or calcium, but is preferably an alkali metal such as lithium, sodium or potassium, and also substituted or unsubstituted ammonium, such as ammonium , C or triethanol-ammonium, C or tripropatur ammonium or tri or tetramethylammonium.

In particular, the detergent according to the invention preferably contains an optical brightener of the following formula (r+).

These optical brighteners of formula (1) and (II) are known compounds and can be prepared by known methods (see DE 22 38 734).

Peracids and salts of peracids are compounds that have been described in the literature and are available on the market, and are already available from temperatures of 20 °C.
An inorganic or organic compound that can bleach dirt. Particular preference is given to organic peracids, such as peroxyacids or polyperacids with an alkyl chain having at least 3 and preferably 6 to 20 carbon atoms, especially diperoxyazelaic acid, diperoxysebacic acid and/or Diperoxyphthalic acid is a diberoxycarboxylic acid having 6 to 12 carbon atoms. However, highly active inorganic peracids such as persulfates and/or percarbonates can also be used. The amount of organic peracid used is preferably 0.5 to 10%, particularly preferably 1 to 5%. The amount of inorganic peracid used is preferably 1 to 30%, particularly preferably 10 to 20%. Note that the numerical values are percentages of the total weight of the detergent. In the case of inorganic peracids, combinations of suitable and, if desired, t=1 compounds are used which enhance the self-activity of the peracids.

It is of course also possible to use mixtures of organic and/or inorganic peracids or persalts.

These peracids are added to detergents in particular by mixing the ingredients together using, for example, screw metering systems and/or fluidized bed mixers.

The detergent is a dry detergent of normal composition. Generally, detergents are
Besides the combination of peracid and optical brightener according to the invention,
For example, it contains the following ingredients. Anionic, nonionic, amphoteric and/or cationic surfactants, bilters such as pentasodium tripolyphosphate or its substitutes such as phosphonates, polycarboxylates, acrylic/maleic acid copolymers, zeolites, nitrilotriacetate and ethylenediaminetetraacetic acid, Anti-soil settling IL agents such as sodium carboxymethylcellulose, pl+regulating salts such as alkali metal or alkaline earth metal silicates, foam regulators such as soaps,
Spray drying properties and granulation properties 2gl1 salts such as sodium sulfate, fragrances and optionally antistatic agents, softeners, enzymes, optical bleaches, pigments and/or toning agents. Of course, these ingredients must be stable to the bleaching system used.

As a result of the combination according to the invention, it is possible to obtain detergents that meet the usual standards in terms of cleaning power, stain removal, rejuvenation of the appearance of laundry, etc., even when washing is carried out at temperatures of 20 to 60°C. It is possible to provide this.

Then, colored laundry and white laundry can be conveniently washed together regardless of the type of fiber material.

The following examples are illustrative of the invention and are not intended to limit it. The percentages in the examples are weight percentages.

Detergent samples were prepared using a conventional two-step method as follows.

First, granules A were produced by drying and granulating a slurry consisting of 1 part of fishing rod and 1 part of detergent having the following composition.

Linear dodecylbenzenesulfonate 84g tallow alcohol tetradecane-ethylene glycol ether (14 moles of ethylene oxide) 1g sodium soap (mainly behenic acid and CI4C)
to) 37 g sodium tripolyphosphate 458 g sodium silicate
79g magnesium silicate
20g carboxymethyl cellulose 12g
Ethylenediaminetetraacetate 2gSodium sulfate 222gI of formula (1)-(It)? Photobrightener (abbreviated as FWA)
Ig obtained granules A (residual moisture after drying 5
Peracid B (70 g of monopersulfuric potassium + 42 mg of anhydrous CuSQ) was homogeneously mixed and added to 500 g of the sample (%) in a dry state.

iStudy 1 A storage test was conducted on the sample of detergent D (granules A-10 peracid B) produced in the above manner as described above.

(b) As a control for the starting value, a portion of this sample was immediately analyzed and the content of FWA was determined by extraction and spectrophotometric absorbance measurement (theoretical value is based on the weight of granules A). (m1%): (b) The other part of this sample was placed in a cardboard packaging bag suitable for commercial powder detergents, i.e. coated, and stored for a specified period under selected and controlled temperature and humidity conditions. Immediately after the expiry of its storage period, the FWA content of the detergent was determined. The difference between the starting value and this measured value is expressed as a percentage.

This value is a measure of the stability of FWA against zero agents contained in powdered detergents.

The method for measuring FWA in Section L is as follows: Thoroughly grind the sample detergent to homogenize it, and dissolve the Ig in a solvent consisting of 9 parts of dimethyl sulfoxide and 1 part of water.
Mix 1. Stir this mixture for 30 minutes at room temperature.
Then centrifuge for 30 minutes. The resulting clear solution is pipetted into a 1 cm quartz cell and its absorbance is measured at its absorption maximum in the ultraviolet region with reference to a standard solution of the particular FWA in question. Absorbance is FW
Proportional to A concentration. The reproducibility of results is approximately ±1% if the test conditions are exactly the same.

Loss of FWA (percentage) during storage under conditions listed in Figure 1-F
was measured. Storage was carried out in sealed packaging bags at a temperature of 20-25°C. The storage period was 6 months. The FWA loss measured after 6 months is 0% as shown below.
Met.

Claims (1)

[Claims] 1. 0.5 to 30% of an inorganic or organic peracid or a salt thereof or a mixture of peracids or a mixture of persalts, and 0.03 to 0.0% of an optical brightener or a mixture of optical brighteners. In a shelf-stable detergent containing 5% optical brightener, the formula (I
) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) Bis-benzofuranyl optical brightener (wherein M means hydrogen or 1 equivalent of a non-chromogenic cation, and n is 2 to 4) A detergent characterized by: 2. Detergent according to claim 1, containing a peracid or a salt of a peracid which bleaches textile materials at temperatures from 20°C. 3. If desired, in combination with a small amount of a compound that enhances the bleaching action of peracid, it can be used as a peracid or persalt, with a carbon number of 6
3. Detergent according to claim 2, containing from 20 to 20, preferably from 6 to 12 diperoxydicarboxylic acids, persulfates and/or percarbonates. 4. The detergent according to claim 1, which contains a compound of formula (II) ▲Mathematical formula, chemical formula, table, etc.▼(II) as an optical brightener. 5. A method of using a detergent according to any of claims 1 to 4 for washing textiles at temperatures of 20 to 60°C. 6. A method for producing a detergent according to any of claims 1 to 4 by mixing the ingredients using a screw metering system and/or a fluidized bed mixer.