Crystalline alkali metal phyllosilicate

Details Crystalline alkali metal phyllosilicate Crystalline alkali metal phyllosilicate

2000-09-11

2002-06-18

Boyer, Charles (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Inorganic silicon containing component

C510S276000, C510S511000, C510S531000, C423S326000, C423S328200, C423S334000

Reexamination Certificate

active

06407055

ABSTRACT:

CROSS-REFERENCES TO RELATED APPLICATIONS
The present invention is described in the German priority application No. 19943470.0, filed Sep. 11, 1999, which is hereby incorporated by reference as is fully disclosed herein.
BACKGROUND OF THE INVENTION
The invention relates to a crystalline alkali metal phyllosilicate, to a process for its preparation, and to detergents and cleaners which comprise the crystalline alkali metal phyllosilicate according to 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 suitable replacements for the detergent builders phosphate and zeolite. The use of such crystalline phyllosilicates for the softening of water is described, for example, in EP-B-0 164 514.
A crystalline phyllosilicate doped with phosphorus is described in DE-A-1 96 01 063. A crystalline sodium phyllosilicate of the formula xNa
2
O*ySiO
2
*zP
2
O
5
where the x to y ratio is from 0.35 to 0.6, the x to z ratio is from 1.75 to 1200 and the y to z ratio is from 4 to 2800 is claimed therein.
A granulate of crystalline sodium phyllosilicate with an SiO
2
/Na
2
O molar ratio of from 1.7 to 4.1:1 and moisture-absorbing substances is described in JP-A-10291817. To obtain such a granulate, a mixture of 80% by weight of sodium silicate (SiO
2
/Na
2
O molar ratio of 2) and 20% by weight of Na
2
CO
3
was compacted, ground and classified.
Detergent builders fulfill a large number of functions. Of these, particular mention is to be made of the removal of or reduction in water hardness and the supplying of alkalinity, i.e. the increase in the pH of the wash liquor. The removal of water hardness is usually measured by measuring the calcium-binding capacity (CBC, see general procedure “Determination of the calcium-binding capacity”). Builder performance is a summary parameter which, inter alia, includes calcium-binding capacity and alkalinity. It is usually determined in practical washing experiments in washing machines (see general procedure “Determination of detergency” and “Determination of inorganic incrustation”).
The removal of the water hardness present in mains water is important since, at the customary, in particular relatively high, washing temperatures, they cause inorganic incrustations on heating elements, walls of washing machines and textiles, and cause the anionic surfactants often used to precipitate out in the form of so-called lime soaps. This results not only in a reduction in detergency but also 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 dissolved detergent builder components. The (desired) increase in the pH in the wash solution results in the dirt particles having a higher surface charge, thus facilitating their removal from the fabric.
In addition, a builder should not produce too many deposits on the textiles as a result of undissolved builder residues. This is usually determined by the solubility test (see general procedure “Solubility test”).
It is known that the addition of carbonate to mains water effects the precipitation of calcium carbonate with the formation of harmful deposits on the washing machine and incrustations in the textiles. For this reason, the person skilled in the art uses builder substances for detergents in order to remove calcium and magnesium from mains water.
However, there has hitherto been a lack of suitable substances which are able to satisfy all of the abovementioned requirements.
Surprisingly, we have now found that phyllosilicates, as a result of certain incorporated substances, achieve the required performance more than expected or even improve upon it and, in particular, counteract the formation of precipitates (solubility) which is to be expected.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to provide a crystalline alkali metal phyllosilicate which, compared with the prior art, has increased water-softening ability, improved builder performance and results in a reduced formation of residues.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The object is achieved by a crystalline alkali metal phyllosilicate of the formula
a
M
I
2
O.
b
EO
2
.c
X
2
O
5
.d
ZO
3
.SiO
2
.e
H
2
O,
in which M
I
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 applies:
0.25≦a≦6.25
2.5·10
−4
≦b≦5.63
0≦c≦2.81
0≦d≦5.63
0≦e≦15.3.
Preferably,
0.25≦a≦6.25
2.5·10
−4
≦b≦5.63
1.25·10
−4
≦c≦2.81
2.4·10
−4
≦d≦5.63
0≦e≦15.3.
Preferably,
0.5≦a≦0.73
3.6·10
−3
≦b≦0.086
2.56·10
−4
≦c≦0.5
3.6·10
−3
≦d≦0.086
0≦e≦0.25.
Preferably,
0.5≦a≦0.63
8.6·10
−3
≦b≦0.043
1.29·10
−3
≦c≦0.025
8.6·10
−3
≦d≦0.043
0≦e≦0.25.
Preferably,
d=0 and
0.25≦a≦6.25
2.5·10
−4
≦b≦5.63
1.25·10
−4
≦c≦2.81
3.13·10
−4
≦e≦15.3.
Preferably,
d=0 and
0.5≦a≦0.6
3.6·10
−3
≦b≦0.086
2.56·10
−4
≦c≦0.5
0≦e≦0.29.
Preferably,
d=0 and
0.52≦a≦0.58
8.6·10
−3
≦b≦0.043
1.29·10
−3
≦c≦0.025
0≦e≦0.29.
In another embodiment of the invention,
c=0 and
0.25≦a≦6.25
2.5·10
−4
≦b≦5.63
2.5·10
−4
≦d≦5.63
0≦e≦12.5.
Preferably,
c=0 and
0.51≦a≦0.7
3.6·10
−3
≦b≦0.086
3.6·10
−3
≦d≦0.086
0≦e≦0.29.
Preferably,
c=0 and
0.51≦a≦0.59
8.6·10
−3
≦b≦0.043
8.6·10
−3
d≦0.043
0≦e≦0.29.
In a further embodiment of the invention,
c=0 and d=0 and
0.25≦a≦6.25
2.5·10
−4
≦b≦5.63
0≦e≦12.5.
Preferably,
c=0 and d=0 and
0.5≦a≦0.59
3.6·10
−3
≦b≦0.086
0≦e≦0.29.
Preferably,
c=0 and d=0 and
0.51≦a≦0.54;
8.59·10
−3
≦b≦0.043;
0≦e≦0.26.
The alkali metal (M
I
) is preferably lithium, sodium, potassium, cesium or mixtures thereof.
The alkali metal (M
I
) is particularly preferably sodium and/or potassium.
The element of the fourth main group (E) is preferably carbon, germanium, tin, lead or mixtures thereof. The element of the fourth main group (E) is particularly preferably carbon.
The element of the fifth main group (X) is preferably nitrogen, phosphorus, arsenic, antimony, bismuth or mixtures thereof.
The element of the fifth main group (X) is particularly preferably phosphorus.
The element of the sixth main group (Z) is preferably sulfur, selenium, tellurium or mixtures thereof.
The element of the sixth main group (Z) is particularly preferably sulfur.
The crystalline alkali metal phyllosilicate according to the invention preferably additionally comprises up to 10% by weight of foreign constituents.
The foreign constituents are preferably compounds of alkaline earth metal ions (magnesium, calcium, strontium, barium), aluminum, zinc, iron, titanium, vanadium, chromium, manganese, cobalt, nickel, boron, fluoride, chloride, bromide and/or iodide.
The present object is also achieved by a process for the preparation of crystalline alkali metal phyllosilicates of the formula
a
M
I
2
O.
b
EO
2
.c
X
2
O
5
.d
ZO
3
.SiO
2
e
H
2
O,
in which M
I
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 applies: 0.25≦a≦6.25;
2.5·10
−4
≦b≦5.63; 0≦c≦2.81; 0≦d≦5.63; 0≦e≦15.3, which comprises mixing a sodium silicate-containing starting material with one or more compounds which comprise the components M
I
, E, X and/or Z, and then heat-treating

Affiliated with

Also associated with

Rating

Crystalline alkali metal phyllosilicate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crystalline alkali metal phyllosilicate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystalline alkali metal phyllosilicate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2911800