Phyllosilicate-containing detergent and cleaner component

Details Phyllosilicate-containing detergent and cleaner component Phyllosilicate-containing detergent and cleaner component

1998-12-16

2001-10-09

Kelly, Cynthia H. (Department: 1774)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Specific organic component

C510S404000, C510S477000, C510S511000

Reexamination Certificate

active

06300303

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a phyllosilicate-containing detergent and cleaner component, to its use for the preparation of detergent constituents, and to detergent constituents comprising the abovementioned phyllosilicate-containing detergent and cleaner component.
BACKGROUND OF THE INVENTION
Crystalline sheet sodium silicates (phyllosilicates) of the formula NaMSi
x
O
2x
.yH
2
O, where M is sodium or hydrogen, x is a number from 1.9 to 4 and y is a number from 0 to 20, and preferred values for x are 2, 3 or 4, have proven to be suitable replacements for phosphate and zeolite builders. The use of such crystalline phyllosilicates for softening water is described, for example, in EP-A-0 164 514. Preferred crystalline phyllosilicates are those in which M is sodium and x assumes the values 2 or 3. Preferred replacements are both &bgr;- and &dgr;-sodium disilicates (Na
2
Si
2
O
5
.yH
2
O), it being possible to obtain &bgr;-sodium disilicate, for example, by the process of PCT/WO 91/08171.
&bgr;-sodium disilicate is obtainable commercially under the name SKS 7, and &dgr;-sodium silicate is commercially available under the name SKS 6 (commercial products from Clariant GmbH, Frankfurt). These powders generally have a bulk density below 600 g/l and have high fine particle size fractions. They usually comprise more than 30% by weight of particles with a particle size below 150 &mgr;m.
In industry, modern detergents are generally prepared by agglomerating pulverulent substances with liquid detergent ingredients to give granules. Granules are often prepared with different detergent ingredients. The granules are then mixed together to give the finished detergent. For agglomeration to be possible, the solid detergent ingredients must have a sufficiently high surfactant absorption capacity.
The absorption capacity for liquid detergent ingredients, in particular surfactants, is, however, limited in the case of the abovementioned phyllosilicates in powder form. If the absorption capacity is exceeded, the resulting product is no longer flowable and can not be used in detergents and cleaners.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to provide a phyllosilicate-containing detergent and cleaner component which has a high absorption capacity for other detergent ingredients without the flow factor dropping too much, and which at the same time leads, following absorption of the detergent ingredients, to a detergent constituent which comprises, as essential constituent, phyllosilicates. The resulting detergent constituent should likewise have as high a bulk density as possible and an adequate flow factor.
This object is achieved by a phyllosilicate-containing detergent and cleaner component of the type mentioned at the beginning, which has a bulk density of less than 540 g/l, a mean particle diameter of more than 150 &mgr;m, a particle size fraction below 150 &mgr;m of less than 10%, a particle size fraction above 1180 &mgr;m of less than 5% and a flow factor of more than 15.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The mean particle diameter is preferably more than 400 &mgr;m.
The particle size fraction below 150 &mgr;m is preferably less than 5%.
The particle size fraction above 1180 &mgr;m is preferably less than 2%.
The flow factor is preferably more than 20.
The phyllosilicate-containing detergent and cleaner component preferably comprises
from 50 to 98% by weight of phyllosilicate,
from 2 to 50% by weight of polycarboxylate and
from 0 to 20% by weight of water.
It preferably comprises
from 90 to 98% by weight of phyllosilicate,
from 1 to 10% by weight of polycarboxylate and
from 1 to 10% by weight of water.
The invention also relates to the use of the abovementioned phyllosilicate-containing detergent and cleaner component for the preparation of detergent constituents.
The abovementioned object is also achieved by a detergent constituent comprising from 30 to 98% by weight of the phyllosilicate-containing detergent and cleaner component and from 2 to 70% by weight of detergent ingredient.
The detergent constituent preferably comprises from 50 to 95% by weight of the phyllosilicate-containing detergent and cleaner component and from 5 to 50% by weight of detergent ingredients.
The detergent ingredients are preferably anionic, cationic and/or nonionic surfactants. Customary liquid detergent ingredients can likewise be used.
The anionic surfactants are preferably used in the acidic and in the neutralized form.
The customary liquid detergent ingredients are preferably polycarboxylates, soil-release polymers, polyvinylpyrrolidone and/or silicones.
The detergent constituent preferably has a bulk density of more than 500 g/l, a mean particle diameter of more than 360 &mgr;m, a particle size fraction below 150 &mgr;m of less than 2%, a particle size fraction above 1180 &mgr;m of less than 10% and a flow factor of more than 4.
The mean particle diameter is preferably more than 500 &mgr;m.
The flow factor is preferably more than 8.
The ingredients used in detergents have different functions. The solid silicates are water-softeners. Soda and sodium bicarbonate buffer the alkalinity of the wash liquor. Surfactants, which are frequently used in liquid form, are soil-removers. Bleaching substances, such as perborate, percarbonates or organic oxygen carriers, and bleach activators or catalysts, such as tetraacetyldiamine or certain manganese complexes are stain-removers. Enzymes, such as proteases, amylases and lypases, aid soil removal. Soil-release polymers, cellulases, carboxymethyl-cellulose and polyvinylpyrrolidone protect the fibers and colors. Optical brighteners enhance the optical impression of whiteness of the laundry. Complexing agents and phosphonates complex undesired traces of heavy metals. Phosphonates and polycarboxylates are used for soil dispersal. Antifoams, perfumes and fillers round off the customary detergent formulations. Such substances and their mode of action are revealed in the known prior art.
According to the invention, the following constituents can be used.
Silicates
It is possible to use sodium phyllosilicates of the formula Na
2
Si
x
O
2x+1
.yH
2
O in which x is a number from 1.9 to 4 and y is a number from 0 to 20. Particular preference is given to a disodium disilicate which crystallizes in the &dgr;-phase and is obtainable from Clariant GmbH, Frankfurt under the name SKS-6. Disodium disilicates which are crystallized in the beta form are also particularly suitable.
Other phyllosilicates, such as, for example, potassium-, calcium- and magnesium-doped phyllosilicates, as cited in EP 0 630 855 and EP 0 550 048 A1, or potassium-doped phyllosilicates according to PCT/WO 96/01307 can also be used.
It is also possible to use silicon-rich sodium phyllosilicates of the formula Na
2
Si
x
O
2x+1
.yH
2
O in which x is a number from 4 to 25 and y is a number from 0 to 20. Particular preference is given in this connection to sodium phyllosilicates in which x is approximately 8, 14 or 20 to 22 and whose crystalline structure is derived from ilerite, magadiite or kenyaite.
Surfactants
Particularly suitable surfactants are nonionic ones of the ethoxylated fatty alcohol type and alkyl polyglycosides or else anionic surfactants of the sulfonate type. Other liquid surfactants can also be used for the purposes of the invention.
Nonionic Surfactants
Nonionic surfactants used are preferably alkoxylated, advantageously ethoxylated, in particular primary alcohols having, preferably, from 8 to 18 carbon atoms and on average from 1 to 12 mol of ethylene oxide per mol of alcohol, in which the alcohol radical may be linear or branched, saturated or unsaturated, or linear and branched, saturated or unsaturated radicals may be present in the mixture, as are usually present in oxo alcohol radicals.
Alkyl Polyglycosides
Preference is given to alkyl glycosides of the formula RO(G)
x
in which R is a primary straight-chain or methyl-branched, in particular methyl-branched in the 2-position, aliphatic radical having from 8 to 22, preferably from 1

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