Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Inorganic silicon containing component
Reexamination Certificate
2000-12-15
2002-09-24
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Inorganic silicon containing component
C510S276000, C510S334000, C510S446000, C510S445000, C510S531000
Reexamination Certificate
active
06455491
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a granular alkali metal phyllosilicate compound, to a process for its preparation, and to detergents and cleaners which comprise such a granular alkali metal phyllosilicate compound.
DE 199 43 237 A1 describes cellulose-containing cogranulates of alkali metal phyllosilicates and disintegrants, which can optionally be colored. These cogranulates are used as detergent builders.
Detergent builders fulfill a large number of functions. Of these, particular mention may be made of the removal of or reduction in water hardness and the supplying of alkalinity, i.e. the increasing of the pH in the wash liquor. The removal of the water hardness present in mains water is important since, at the customary, in particular relatively high, washing temperatures, it causes inorganic incrustations on heating elements, walls of the washing machine and on textiles, and causes the anionic surfactants frequently used to precipitate out in the form of so called lime soaps. Firstly, this results in a decrease in detergency and, secondly, produces a gray haze on the laundry after just a few wash cycles. Inorganic incrustations consist of water hardness precipitated out in the form of calcium carbonate or of deposited residues of undissolved detergent builder components. The (desired) increase in the pH in the wash liquor results in the soil particles receiving a higher surface charge and therefore being easier to remove from the fabric.
According to the prior art, detergent constituents, this applies in particular to the builder component, are colored for various purposes by adding colorants. A particularly high color strength of the product can only be achieved here by increasing the colorant proportion accordingly. In this connection, a disadvantage is that residues of the colorants can remain in the wash liquor and lead to the tingeing of textiles and/or pollution of the environment. Surprisingly, we have now found that alkali metal phyllosilicates can be colored in a particularly color-intensive manner by appropriate choice of additives in combination with colorants without significantly increasing the proportion of colorant in the product.
2. Summary of the Invention
The object of the present invention is therefore to provide a granular alkali metal phyllosilicate compound which has particularly high color intensity relative to the prior art.
This object is achieved by a granular alkali metal phyllosilicate compound of the type mentioned in the introduction, which comprises a crystalline alkali metal phyllosilicate, a colorant and an additive.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The granular alkali metal phyllosilicate compound according to the invention preferably comprises
68-99.79% by weight of alkali metal phyllosilicate
0.01-2% by weight of colorant
0.1-15% by weight of additives
0.1-15% by weight of water.
The granular alkali metal phyllosilicate compound according to the invention particularly preferably comprises
84-98.95% by weight of alkali metal phyllosilicate
0.05-1% by weight of colorant
0.5-5% by weight of additives
0.5-10% by weight of water.
Preferred alkali metal phyllosilicates which can be used advantageously for the preparation of the compound according to the invention are those of the formula NaMSi
x
O
2x+1
•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. Phyllosilicates of this type are described in EP-B-0 164 514, to which reference is expressly made here. Preferred phyllosilicates are those in which M is sodium and x assumes the values 2 or 3. In particular, both beta- and delta-sodium disilicates Na
2
Si
2
O
5
•yH
2
O are preferred, where beta-sodium disilicate can, for example, be obtained by the process described in WO-A-91/08171. Beta-sodium disilicate is available commercially under the name SKS-7 and delta-sodium disilicate is commercially available under the name ™SKS-6 (products from Clariant GmbH).
Further phyllosilicates which can preferably be used for the preparation of the granular alkali metal phyllosilicate compound according to the invention are described in DE-A-198 30 591. This is a finely divided crystalline sheet sodium disilicate of the formula NaMSi
x
O
2x+1
•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, which has a content of from 0 to 40% by weight of alpha-disodium disilicate, 0 to 40% by weight of beta-disodium disilicate, 40 to 100% by weight of delta-disodium disilicate and 0 to 40% by weight of amorphous fractions and a screen oversize residue of less than 60%, and is free from sodium metasilicate.
DE-A-196 01 063 describes a crystalline sodium phyllosilicate of the formula xNa
2
O*ySiO
2
*zP
2
O
5
with an x:y ratio of from 0.35 to 0.6, an x:z ratio of from 1.75 to 1200 and a y:z ratio of from 4 to 2800. These phosphorus-containing phyllosilicates, which have a high degree of crystallinity and a very high calcium-binding capacity, are likewise preferably used for the preparation of the compound according to the invention.
Also used according to the invention are crystalline alkali metal phyllosilicates of the formula
a M′
2
O•b EO
2
•c X
2
O
5
•d ZO
3
•SiO
2
•e H
2
O,
in which M′ is an alkali metal, E is an element of the fourth main group, X is an element of the fifth main group and Z is an element of the sixth main group of the Periodic Table of the Elements, and the following also apply:
0.25
≦a≦
6.25
2.5·10
−4
≦b≦
5.63
0
≦c≦
2.81
0
≦d≦
5.63
0
≦e≦
15.3
In this connection, preferred crystalline alkali metal phyllosilicates are those which have a certain content of phosphorus, sulfur and/or carbon.
Suitable silicates are, however, also highly alkaline crystalline sodium silicates of the composition
Na
2
O*xSiO
2
*yH
2
O
where x is a number between 1.2 and 2.1, and y is a number between 0 and 20, and highly alkaline crystalline sodium silicate consists of 70 to 98% by weight of sheet disodium disilicates and of 2 to 30% by weight of non-phyllosilicatic sodium silicates of the formula
Na
2
O*vSiO
2
*wH
2
O
in which v is a number between 0.05 and 2 and w is a number between 0 and 20.
Finally, preference is also given to using sparingly soluble alkali metal silicates which comprise alkali metal phyllosilicates in finely distributed form in a nonphyllosilicatic alkali metal silicate environment of the formula x M′
2
O•ySiO
2
, in which M′ is an alkali metal and y/x is (1.9 to 500):1. Here, the alkali metal silicate corresponds overall to the formula
a M′
2
O•b M″O•cX
2
O
3
•dZ
2
O
5
•eSiO
2
•fH
2
O
in which M′ is an alkali metal, M″ is an alkaline earth metal, X is an element of the third main group and Z is an element of the fifth main group of the Periodic Table of the Elements and the following also apply:
0
≦a≦
1;
0
≦b≦
0.5;
0
≦c/e≦
0.05;
0
≦d/e≦
0.25;
1.9
≦e≦
4;
0
≦f≦
20
Preference is given here to those sparingly soluble alkali metal silicates which have a certain content of alkaline earth metal ions (magnesium and/or calcium), boron and/or phosphorus.
Suitable colorants are preferably oxidation-stable and/or alkali-stable dyes, and pigments. Suitable dyes can primarily be the Sandolan types (S. Blau E-HRL 180 (blue), S. NBG125 (brilliant red), S. MFBL (green)) or else Vitasin types (V. ponceau 4RC82 (red), V. chinolingelb 70 (yellow) and Telon types (Telon Blau AFN (blue), DyStar Textilfarben). It is also possible to use pigments such as Patentblau (patent blue) (DyStar), Unisperse types or Terasil-T types (both Ciba).
The additives are preferably alkyl alkoxylates, gluconamides, alkyl polyglycosides, alkyl ester alkoxylates, oligoglycols, polyglycols, monoalkyl glycol ethers, monoalkyl oligoglycol ethers, monoalkyl polyglycol ethers, dialkyl glycol ethers, dialkyl oligoglycol ethers, dialkyl polyglycol ethers, olig
Bauer Harald
Holz Josef
Schimmel Günther
Boyer Charles
Clariant GmbH
Silverman Richard P.
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