Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
1999-08-18
2002-05-21
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S421000, C510S424000, C510S428000, C510S477000, C510S508000, C510S511000
Reexamination Certificate
active
06391842
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a novel detergent which contains liquid sodium silicate, and more specifically, to a clear liquid detergent containing liquid sodium silicate.
BACKGROUND ART
Liquid detergents utilizing sodium silicate which is liquid silicate salt have been expected to latently have a far excellent detergency power than those of any other surfactants, and since long time ago, there have been enormous efforts and researches made to develop such a detergent in many industrial fields including detergent and chemical industries. However, until today, there has been n6 developmental technique established in our country or other world industrial countries.
Conventionally, for liquid detergents, alminosilicate salts such as zeolites (A-type, Y-type), crystalline alminosilicate salts, inorganic silicates, inorganic carbonates or the like have been utilized as a detergency builder, and there have been a great number of patent applications filed. However, many of liquid cleansers, liquid detergents and the like are mainly designed for cleaning dishes, kitchen and bathroom, and liquid sodium silicate is not effectively utilized.
Liquid sodium silicate exhibits a mixing hindrance to a nonionic surfactant, an anionic surfactant, a metal-chelating agent, an anti-freezing agent, various builders, moisture and the like. When it is mixed with them, the mixture exhibits an optical anisotropy due to their reaction, becomes cloudy due to changes in temperature conditions caused by heating or warming, is gelled into a sherbet state due to an abrupt change in pH, and precipitates ultramicro-crystals. Therefore, the detergent containing liquid sodium silicate has not been easy to develop. In other words, there has been no clear liquid detergent which contains liquid sodium silicate together with a surfactant, and yet does not generate precipitates, or does not become cloudy due to the temperature changes.
Thus, it is an object of the present invention to provide a clear or transparent liquid detergent which contains liquid sodium silicate together with a surfactant and which does not generate precipitates, or does not become cloudy due to the temperature changes, such detergent being unable to be provided by the conventional technique.
DISCLOSURE OF INVENTION
The present inventors have conducted intensive researches for a long period of time in an attempt to provide a clear liquid detergent containing sodium silicate, that could not have been conventionally achieved, and at last accomplished the present invention.
Thus, the present invention provides a clear liquid detergent which contains, in water, liquid sodium silicate, an alkylethersulfate salt anionic surfactant, and a polyoxyethylene alkyl or aryl ether nonionic surfactant, and which does not generate precipitates or does not become cloudy due to a change in temperatures. Such a detergent has never existed in the past.
The present inventors have found that sodium silicate, a predetermined nonionic surfactant, a predetermined anionic surfactant, and optionally or preferably, a fluorosurfactant, form, preferably in the presence of a metal-chelatinqg agent, a buffering agent, a pH adjusting agent, and a freezing/clouding inhibitor, a liquid detergent which can be dissolved into water without a mutual inhibition reaction, fully exhibits a required detergency power, and maintains transparency without regard to temperature conditions. Based on these findings, the present invention has been accomplished.
In one aspect of the present invention, there is provides a clear liquid detergent composition containing liquid sodium silicate, an alkylethersulfate salt anionic surfactant, a polyoxyethylene alkyl or aryl ether nonionic surfactant, a metal-chelating agent, malic acid (particularly preferably DL-malic acid) or citric acid, glycerin, fatty acid alkanolamide and water, and optionally, further containing a fluorosurfactant.
Further, according: to the present invention, there is provided a clear liquid detergent composition comprising 10 to 35% by:weight of (a) a sodium silicate solution containing 1 to 40 parts by weight of sodium silicate, 30 to 85 parts by weight of water, 5 to 15 parts by weight of a metal-chelating agent, 0.1 to 3.0 parts by weight of malic acid (particularly preferably DL-malic acid) or citric acid and 0.15 to 15 parts by weight of glycerin; 89.5 to 59% by weight of either (b) a surfactant solution containing 5 to 50 parts by weight of an alkylethersulfate salt anionic surfactant, 5 to 30 parts by weight of a polyoxyethylene alkyl or aryl ether nonionic surfactant and 20 to 65 parts by weight of water, or (c) a surfactant solution containing 5 to 50 parts by weight of an alkylethersulfate salt anionic surfactant, 5 to 30 parts by weight of a polyoxyethylene alkyl or aryl ether nonionic surfactant, 0.01 to 0.1 part by weight of a fluorosurfactant and 20 to 65 parts by weight of water; and 0.5 to 6% by weight of (d) fatty acid alkanolamide.
The clear liquid detergent composition of the present invention is suitable for washing clothes, and cleaning niche, toilet, bathroom including a bath tub, and it can be used for cleaning dishes when diluted.
BEST MODE OF CARRYING OUT THE INVENTION
The present invention will now be described in more detail.
Liquid sodium silicate, which is contained characteristically in the clear liquid detergent (composition) of the present invention, imparts an excellent detergency power to the detergent, together with a predetermined surfactant, which will be explained later, and is an essential component for the detergent to function as such a detergent. The clear liquid detergent of the present invention, by containing liquid sodium silicate, exhibits such an excellent and high detergency power that cannot be achieved by a conventional detergent.
As such liquid sodium silicate described above, use may be made of sodium silicate No. 1 as specified by JIS (specific gravity: 59.2 or higher (Be value at 15° C.); silicon dioxide (SiO
2
): 35 to 38% by weight; sodium oxide (Na
2
O): 17 to 19% by weight, iron (Fe): 0.03% by weight or less,. and water-insoluble component: 0.2% by weight or less), sodium silicate No. 2 as specified by JIS (specific gravity: 54 or higher (Be at 15° C.); silicon dioxide (SiO
2
): 34 to 36% by weight; sodium oxide (Na
2
O): 14 to 15% by weight, iron (Fe): 0.03% by weight or less, and water-insoluble component: 0.2% or less by weight), and sodium silicate No. 3 as specified by JIS (specific gravity: 40 or higher (Be at 15° C.); silicon dioxide (SiO
2
): 28 to 30% by weight; sodium oxide (Na
2
O): 9 to 10% by weight, iron (Fe): 0.02% by weight, and water-insoluble component: 0.2% by weight or less). In general, sodium silicate used in the present invention can be represented also by formula: Na
2
O.nSiO
2
, and in the case where n=about 2 to 4, it is liquid. Apart from the JIS products or commercially available products, a prepared product obtained by mixing sodium oxide and silicon dioxide at a ratio of 1 mole of the former to 2 to 4 moles of the latter can be used. As liquid sodium silicate, JIS sodium silicate No. 2 and sodium silicate No. 3 are preferable, and in particular the silicate No. 2 is more preferable.
The surfactants used in the clear liquid detergent of the present invention are an alkylethersulfate salt anionic surfactant, a polyoxyethylene alkyl or aryl ether nonionic surfactant. Optionally, a fluorosurfactant can be further contained in the detergent of the present invention. As these surfactants, commercially available products can be used.
Preferable examples of the alkylethersulfate salt anionic surfactant are primary or secondary higher alcoholethoxysulfates and alkylphenolsulfates. Of these, primary and secondary alcoholethoxysulfates, each of which has an excellent detergency and an excellent foaming property, and is less irritative to skin, are particularly preferable.
Primary higher alcoholethoxysulfate can be represented by general formula:
R—(OCH
2
CH
2
)
n
OSO
3
M
where R represents a primary alkyl group, particular
Uno Hisashi
Uno Minoru
Uno Tsutomu
Ogden Necholus
Pennie & Edmonds LLP
Uno Shoyu Co., Ltd.
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