FI92329C - Stock stabilized detergent with enhanced bleaching properties - Google Patents

Description

1 92329

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The present invention relates to a stock-stabilized detergent with enhanced bleaching properties, in particular a household detergent for laundry and laundry, which detergent contains 2-20% by weight of detergents and other auxiliaries, including detergents. you. ... ..

10 As the use of washing machines is becoming more common, the properties of the detergent must also be adapted to the changed conditions.

The new detergents are therefore combinations of detergents which act as detergents, bleaches and detergents, which are called builder agents. feel.

Particularly good builder materials are polymerized phosphates, preferably sodium tripolyphosphate.

Due to the risk of eutrophication of rivers and lakes caused by phosphates in domestic wastewater, zeolites have been proposed as builder materials.

. It has been shown that when zeolites are used as builder, the laundry loses the desired softness after several washes. In addition, during storage between manufacture and use, the detergent loses some of its detergent effect due to the decomposition of the bleach.

DE-3 416 669 A1 therefore proposes that 1-20% by weight of crystalline layered silicate or alkali metal silicate is added to the detergent. Tate also got a soft feel on the laundry when using zeolites as a builder, however, the storage stability of the detergent could not be affected.

2 '92329

Therefore, it was an object of the present invention to provide a detergent which has better storage stability and has enhanced bleaching properties, while at the same time preserving the soft feel of the washed textiles.

It has surprisingly been found that a stock-stabilized detergent with enhanced bleaching properties is obtained when the detergent contains 10 to 50% by weight, preferably 20 to 35% by weight, of crystalline layered silicate having the general formula as a builder.

NaMSi 2 O 5 where M = Na or H, and a bleaching agent, wherein the amount of bleaching agent is measured such that the detergent contains 0.5-4% by weight, preferably 1.0-2.5% by weight of detergent active oxygen (AVOX ).

Particularly good results were obtained when the crystalline layer silicate corresponded to the i-form of Na 2 Si 3 O 5.

A) In addition, the detergent according to the invention can advantageously be characterized in that the particle diameter of the crystalline layered silicate varies between 0.01 and 1000 μm, preferably between 1 and 20 μm; b) the ion exchange capacities of the crystalline layered silicate are between 400 and 1200 mmol Na + / 100 g anhydrous substance; c) the bleaching agent is sodium perborate tetrahydrate, sodium perborate monohydrate and / or sodium percarbonate; (d) it contains up to 20% by weight of inorganic phosphates, borates, citrates, gluconates, nitrilotriacetic acid (NTA) and / or iminodiacetates as additional builder substances; e) it consists of agglomerate particles with a particle size between 0.25 and 2.5 mm and has been produced by a 35 spray mist mixing process;

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92329 3 f) it contains, as detergents, alkali metal salts of alkylbenzenesulfonates, higher alkyl sulfonates and / or higher fatty alcohol polyethoxylate sulfates, the alkyl groups of which preferably have 10 to 18 carbon atoms; g) it contains up to 10% by weight of carboxymethylcellulose, carboxymethylstarch and / or methylcellulose as excipient.

The crystalline layered silicate used for the preparation of the detergent according to the invention can be prepared according to DE-3 413 571 A1. Although all of the crystalline layered silicates disclosed in said publication can be used in the preparation of the detergent according to the invention, it has been found that it is advantageous to favor 5-Na2Si50j if enhanced bleaching ability is desired.

The determination of detergent oxygen (AVOX) in a bleaching agent such as detergent was performed according to the method of Dr. E. Heinerg, Tenside 2 (1965) 180. The AVOX number of the sodium perborate tetrahydrate (NaBO3 · 20 4H2O) studied was 10% by weight, sodium perborate monohydrate NaBO3 H 2 O) AVOX number was 15% by weight, sodium percarbonate (2 Na 2 CO 3 · 3H 2 O) AVOX number was 13.5% by weight.

The washing power (bleaching power) of the detergent was determined as the whiteness of the test fabric (WFK polyester / cotton with tea stains, 25 Order-Code 20 G) according to DIN 44983.

The washing performance (bleaching capacity) of the detergent was determined by the differential method according to Equation I% WK =% WGg -% WGb (I) 30 where% WK =% washing performance (bleaching capacity)% WGg =% whiteness of washed fabric% WGb =% whiteness of unwashed fabric, 92329 4

The storage test was performed under the following extreme conditions:

The test detergent was stored in a refrigerator with a relative air humidity of 70% and a temperature of 37 ° C. The detergent was packaged in a normal detergent package. The water vapor permeability of the package was 0.4 g / m2h.

The detergent compositions studied are listed in Table 1.

Table 2 summarizes bleach degradation data as a function of time under the most extreme storage conditions. Table 2 also included 2 commercially available zeolite and sodium polyphosphate based detergents. The decomposition of the bleaching agent, especially sodium percarbonate, is very voxnac in the presence of zeolite.

Washing results: Detergent compositions 2 and 4 were tested according to DIN 44983 and the results were calculated according to Equation I. the washing power (bleaching ability) of the detergent 2 was 30%, the washing power of the detergent 4 according to the invention was 36.5%.

As a result of the palpation test carried out by a group of experts, the fabric washed with the detergent 4 according to the invention was considerably softer than the fabric washed with the zeolite-containing detergent 2.

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Claims (7)

92329 A storage-stabilized detergent with enhanced bleaching properties and containing from 2 to 20% by weight of detergents and other auxiliaries, including fillers, characterized in that it contains from 20 to 50% by weight, preferably from 20 to 50% by weight, of builder. 35% by weight, of a layered layered silicate having the general formula NaMS i205 where M = Na or H, and bleach, the amount of bleach being measured such that the detergent contains 0.5 -4% by weight, preferably 1.0-2.5% of detergent oxygen (AVOX). Storage-stabilized detergent according to Claim 1, characterized in that the crystalline layered silicate corresponds to the <S form of Na 2 SiO 2. Storage-stabilized detergent according to Claim 1 or 2, characterized in that the particles of the crystalline layered silicate have a diameter of between 0.01 and 1000 μιη, preferably between 1 and 20 μπι. Storage-stabilized detergent according to one of Claims 1 to 3, characterized in that the ion exchange capacity of the solid layered silicate is from 400 to 1200 mmol Na + / 100 g of anhydrous substance. Storage-stabilized detergent according to one of Claims 1 to 4, characterized in that the bleaching agent is sodium perborate tetrahydrate, sodium perborate monohydrate and / or sodium percarbonate. Storage-stabilized detergent according to one of Claims 1 to 5, characterized in that it contains inorganic and / or organic phosphates, borates, citrates, gluconates, nitrilotriacetic acid (NTA) and / or iminodiacetates up to 20% by weight as additional builder. t · 92329 Storage-stabilized detergent according to one of Claims 1 to 6, characterized in that it consists of agglomerate particles with a particle size of between 0.25 and 2.5 mm and is produced by a spray-molding process. . · II 9/329