DE2537570A1 - DETERGENT POWDER, IN PARTICULAR LOW FOAM DETERGENT WASHING POWDER FOR TEXTILES - Google Patents

Description

DR. ING. A. VAN DERWERTH DR. FRANZ LEDERER

(1934-1974) 8 MUNICH flO

LUCILE-ORAHN-STR 22 TEL. 10891 * 7 29 * 7

Munich, August 21, 1975 c. 762 (L)

UNILEVER N.V.

Burgemeester s'Jacobplein 1, Rotterdam, Netherlands

Detergent powder, in particular low-foaming washing powder for textiles

Addendum to patent (patent application P 25 20 187.0)

The invention relates to a modification and improvement of what is described in the main patent (patent application P 25 20 187.0) Detergent powder that has been produced according to the process described there.

The main patent (patent application P 25 20 187.0)

relates to a method for producing a particulate detergent base powder by spray drying a slurry, which uses a nonionic surfactant as the main detergent active ingredient This process is characterized by the fact that the tendency of the powder to auto-oxidize is countered, by adding an alkaline material in a slurry

S09811 / 0975

at least 5% sodium oxide equivalent amount and from 0.5 to 6% of an alkanolamide is entered, the amounts being expressed in terms of weight of the particulate detergent base powder are.

Furthermore, the main patent (patent application

P 25 20 187.0) a detergent base powder that was produced according to the above-mentioned process.

The most common method of making washing powder for textiles is to make a slurry of the relatively heat stable ingredients and spray dry or spray cool them. Other desired, but less stable components are added later, dry.

Furthermore, in the applicant's German patent application P 24 36 145.3, a method for the production of particulate Detergent compositions described which have a nonionic surfactant as the primary detergent active Constituent, this method comprising the step of adding at least 4% of an amino compound, z. An alkanolamide, in the ingredient slurry. This addition causes the tendency for one to occur Autoxidation is considerably reduced during the spray drying step.

As stated earlier, the main patent relates

(Patent application P 25 20 187.0} a method for producing a Detergent powder and in particular a washing powder for Textiles, the slurry being formulated to contain an alkanolamide in an amount of 0.5 to 6% by weight and an alkaline one Contains material in an amount equivalent to at least 5% sodium oxide. The addition of alkanolamide and alkali sets the Tendency to occur auto-oxidation is significantly reduced.

The present invention therefore relates to a low-foaming detergent powder and in particular to a low-foaming washing powder for textiles that contain a non-ionic, interfacial

6 0 9811/0975

active agent as the main detergent-active ingredient, an alkanolamide as a processing aid and a Contains foam suppressants.

According to a particular embodiment, the invention relates to a slightly foaming washing powder for textiles, which has a spray-dried component, which is a non-ionic, surface-active one Agent in an amount such that it is the major detergent-active ingredient of the powder, as well from 0.5 to 6% of an alkanolamide to reduce the tendency of the spray-dried portion to auto-oxidize, the Powder additionally contains a foam suppressant, and if the amount of alkanolamide is below 4% - at least one 5% by weight, based on the powder, of an amount equivalent to sodium oxide of an alkaline material.

The suds suppressor is used to reduce the effects of the addition of an alkanolamide in the composition for processing purposes to suppress foam formed.

It has been found that monoalkyl phosphate esters are the most powerful suds suppressing agents in the systems of the invention, and of these, the C 1-4 alkyl ester is the most powerful. Such substances are commercially available, e.g. B. under the trade name "AIf 5" from Lankro Chemicals Limited, this product containing a high proportion of MOnO-C ₁ g-alkyl phosphate ester and has proven to be very advantageous. Mixtures of mono- and dialkyl phosphate esters have been found to be much less performing.

Although silicone oils such as are commercially available, e.g. B. Dow Comings DB-31 (a 30% polysiloxane emulsion) and Q2 / 3000 (35 wt% polysiloxane absorbed onto sodium tripolyphosphate) have been found to perform well, they are difficult to be incorporated into the composition. Furthermore, such silicone oils are currently quite expensive.

6098 11/0975

Generally the suds suppressor is in the compositions present in amounts from 0.1 to 5.0, and preferably from 0.5 to 1.5 weight percent.

It has been found that one of the most advantageous ways of incorporating a monoalkyl phosphate ester into laundry detergent powder consists in noodles of the material with z. B. sodium tripolyphosphate and / or a nonionic surfactant and / or sodium carboxymethyl cellulose.

Another method of incorporation is to inject it directly into the detergent slurry just before the slurry reached the spray drying nozzles. This method is especially beneficial when having some or all of it Part of the nonionic surfactant is introduced into the slurry by injection thereof as the alkyl phosphate can then be injected at the same time.

Yet another method of incorporation is to mix the monoalkyl phosphate ester with a nonionic surfactant, preferably a liquid agent, and spray the resulting mixture onto an absorbent such as sodium perborate monohydrate, expanded borax, or one or more of the absorbent forms of sodium tripolyphosphate. Optionally a solid or almost solid nonionic surfactant can be used in this method, in which case it will be necessary to heat the mixture, e.g. B. to 60 ⁰ C to spray it on the absorbent. A small amount of water can also be added to the mixture.

In general, the detergent consists of the non-ionic, surfactants, the alkanolamide and the suds suppressing agent from the conventional ingredients in conventional ones Amounts. For example, the agents or compositions can contain builder components or builder substances, fillers, synthetic, anionic cleaning agents (detergents) and soaps in

6 09811/0975

contain smaller amounts as well as components that are present in smaller quantities _/ z. B. Antioxidants, fluorescent substances and optical brighteners. These ingredients can be added either to the spray-dried portion of the slurry or to the dry-metered portion. In addition, the washing powder can contain heat-sensitive constituents such as sodium perborate or percarbonate, enzymes and perfumes, which are added to the dry portion.

Further details of these components are given below.

The nonionic surfactant is in an amount from about 2 to about 20% by weight and preferably from about 5 to about 15% by weight, and in each case it forms the predominant, detergent active ingredient, d. H. it is in an amount of at least 50% of the total detergent content or Detergent content present.

Examples of suitable nonionic surfactants are:

Condensates of alkylphenols with about 6 to 12 carbon atoms either in straight-chain or branched-chain arrangement containing alkyl radical (derived e.g. from polymerized propylene, Diisobutylene, octene, dodecene or nonene) with about 5 to 25 moles of ethylene oxide per mole of alkylphenol; as well as condensates of linear or branched chain aliphatic alcohols containing 8 to 18 carbon atoms with ethylene oxide, e.g. B. a coconut alcohol-ethylene oxide condensate, which has about 4 to 30 moles of ethylene oxide per mole of coconut alcohol.

Preferred nonionic surfactants are:

1. Nonylphenol-8,10,12 and 15 (mol) ethylene oxide condensates;

2. Tergitol 15-S-7,9,12 and 15;

3. Tergitol 45-S-7,9,10,12 and 15;

4. Dobanol 25-7, 9, 12 and 15;

5. Dobanol 45-7, 9, 12 and 15;

609811/0975

- ο -

6. Softanol 70 and 90;

7. Alfol 12/14 and 14 / 12-7,9,12 and 15;

8. Synperonic 7, 9, 11 and 15;

9. Acropol 35 7Ä0, 35 9Ä0 and 11Ä0.

ÄO = ethylene oxide.

All of these materials are ethoxylated alcohols. Syperonics (trade name of Imperial Chemical Industries Ltd.), Dobanole, (Trademarks of Shell Chemicals Ltd.) and Acropole (Wa ^ - renbezeichnung) are ethoxylated derivatives of primary alcohols, which were produced according to the oxo process. These alcohols therefore contain a proportion of branched materials. Alfole (trade name) come from Condea-Ziegler alcohols, and are therefore less branched. Tergitole (trademarks of Union Carbide Corporation) and Softanole (trademarks of Japan Catalytic KK) are derived from linear, secondary alcohols. In particular, the tergitols of the 15-S series come from linear, secondary Cj .j _. ^ - alcohols.

The builder component or builder component for the cleaning agent can be present in an amount of from about 15 to 55% by weight and preferably from 20 to 40% by weight, based on the powder. Examples of suitable builder ingredients or builder substances are phosphate builders such as sodium ortho-, pyro- or tripolyphosphate or mixtures thereof, or they can also be other builders or builders, eg. B. to sodium carbonate, sodium silicate, sodium titrate, sodium oxydiacetate, Natriumnxtrilotriacetat, sodium ethylenediamine tetraacetate, sodium salts of long-chain dicarboxylic acids, z. B. straight-chain (C _{1 n} to Cq) succinic acids and malonic acids, sodium carboxymethyloxysuccinate, sodium salts of QC -sulfonated, long-chain monocarboxylic acids and modified starches such as oxidized starches, e.g. B. using sodium hypochlorite oxidized starches in which some anhydroglucose units have been opened to form dicarboxyl units.

60981 1/0975

The invention is illustrated in more detail by means of the following examples, Examples 1 to 3

Mixtures of the following ingredients were added to the funnel of a Simon-Heesen device for preparation of pasta entered and deformed into pasta.

example 1 Wt% Example. 3 33 Example 2 30th AIf 5 62 35 - Sodium tripolyphosphate 5 - - Tallow ethoxylate (18Ä0) - - 40 Sodium carboxymethyl cellulose 60 (65% ai) - 5 Tergitol 15-S-9 - 5 12th soap - 12th water

These noodles were made into a nonionic surfactant Detergent powder containing agents with one of the following compositions:

Example 4

Wt%

Tergitol 15-S-9 10.0

Coconut monoethanolamide 1.5

Colonut Soap 2.0

Sodium tripolyphosphate 38.0

Sodium silicate 5.0

colored particles of enzyme and tripolyphosphate 5.0

Sodium perborate 25.0

AIf 5 pasta - 3.0 moisture and ingredients in lesser amount to 100.0

80981 1/0975

Example 5

Wt%

Synperonic 7 12.2

Palm kernel monoethanolamide 2.0

Sebum soap 2.0

Sodium tripolyphosphate 40.0

Sodium silicate 6.0

Sodium perborate 25.0

AIf 5 noodles 3.6 moisture and ingredients in

lower amounts to 100.0

Example 6

The following washing tests show the reduced foam formed by the agents or compositions according to the invention compared to that of a similar composition, which did not contain an anti-foaming agent was formed.

A commercially available washing machine was used in eight separate experiments (Hoover Keymatic, trade name) loaded with 3.2 kg of naturally soiled clothes. The machine was turned on, and the height of the foam appearing in the window of the shutter door was measured at fixed time intervals measured. The results obtained were as follows:

609 811/0975

Attempt washing program. Dosage water hardness powder compositions

(g) whites (85 ° C) 200 26 <

Wash whites (85 ° C) 200

Ex. 4, where the AIf replaced 5 noodles with 3% NTPP * became.

Ex. 4 with the AIf 5 noodles from Ex. 2.

White laundry (85 ° C) 150 Ex. 4 with replacement of AIf.5-

Pasta with 3% NTPP *

Whites (85 ° C) 150 ex. 4 with AIf 5 noodles from ex. 2.

Gentle action (40 ⁰ C) 200 26 ^c

Example 4 by replacing the AIf 5 noodles with 3% NTPP *

Gentle action (40 ⁰ C) 200 26 ^C

Ex. 4 with AIf 5 noodles from Ex. 3.

Gentle cycle (40 ⁰ C) 150 ex. 4 with replacement of the AIf 5 noodles with 3% NTPP *

Gentle cycle (40 ⁰ C) 150 * NTPP = sodium tripolyphosphate example 4 with AIf 5 noodles from

Ex. 3.

£ 0981 1/0975

Foam height in the washing machine door window (cm)

Time attempt attempt attempt attempt attempt (min) attempt 1 attempt 2 attempt 3 attempt 4 attempt 5 attempt 6 attempt 7 attempt 8

5 12.7 ; eat traces 25.4 c-
2ßen 2.5 25.4 - 5, 1 25.4 * - 5, 1 10 fully traces fully 5.1 fully - 5, 1 fully - 5, 1 15th fully 1.3 fully 6.4 - 5, 1 - 5, 1 20th
25th over
flow 8.3
3.2 practice
fli < 7.6
11.4 - 5, 1 \ - 5, 1 30th 5.1 14.0 - - 35 7.6 P. 15.2 r - - 40 12.7 - - 45 11.4 - - 5C > > 10.2

It follows that the compositions containing a suds suppressor contained, namely those used in Runs 2, 4, 6 and 8, produced considerably less foam than the examples which did not contain an anti-foaming agent-

609811/0975

Claims (4)

Claims 1. Detergent powder, especially low-foaming detergent powder for textiles that use a nonionic surfactant as the primary detergent active Contains component, according to patent (patent application P 25 20 187.0), characterized in that it continues an alkanolamide processing aid and a suds suppressor contains. 2. Detergent powder, especially low-foaming washing powder for textiles, according to claim 1, which contains a spray-dried portion which is a nonionic, surface-active Comprises agent in an amount such that it is the major detergent-active ingredient of the Represents powder, characterized in that the spray-dried portion contains from 0.5 to 6 wt .-% of alkanolamide, and that the powder contains a foam suppressant, with an alkanolamide content of less than 4% by weight of the spray-dried portion, the powder contains an amount of alkaline material equivalent to at least 5% by weight of sodium oxide. 3. Detergent powder, especially low-foaming washing powder for textiles according to claim 1 or 2, characterized in that the foam suppressant is a monoalkyl phosphate ester is. 4. Detergent powder, especially low-foaming washing powder for textiles, according to one of the preceding claims, characterized in that the amount of foam suppressant in the powder is from 0.1 to 5% by weight. 6098 1 1/0975