Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
1999-08-18
2002-05-14
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S421000, C510S424000, C510S428000, C510S477000, C510S511000
Reexamination Certificate
active
06387868
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a novel liquid detergent containing an alkylbenzenesulfonate salt anionic surfactant and liquid sodium silicate, and more specifically to a clear liquid detergent containing an alkylbenzenesulfonic anionic surfactant and liquid sodium silicate in water.
BACKGROUND ART
As a technique established to manufacture a liquid detergent which utilizes an alkylbenzenesulfonate salt which is an anionic surfactant, it is known to neutralize a soft or linear alkylbenzenesulfonic acid by adding thereto sodium hydroxide in a certain amount of water, to combine therewith other surfactants, water, a pH adjusting agent, a buffering agent, a thickener, a clouding inhibitor and the like. As the alkylbenzenesulfonic acid, a hard type (a type having an alkyl group consisting of a tetramer of propylene) has been conventional used; however nowadays, a linear type is mainly used. As the other surfactants, polyoxyethylene alkyl ether, which is a nonionic surfactant, is used. Further, as a softener which imparts a softness to an article to be washed, an aliphatic quaternary ammonium salt, which is a cationic surfactant, is used. Furthermore, polyethylene glycol is used for the purposes of preventing the freezing of the liquid detergent, stabilization of the viscosity, and improvement of the compatibility with the other surfactant, and its moistness.
Until now, various studies have been conducted in an attempt to further improve the detergency power of the liquid detergent containing an alkylbenzenesulfonate salt anionic surfactant such as described above; however a satisfactory results have not yet been achieved.
Incidentally, it is known that sodium silicate, which is a liquid silicate salt, potentially has a detergency power higher than that of any other surfactants. Therefore, the detergency power is expected to be further enhanced, if sodium silicate can be blended into the above-described conventional liquid detergent containing alkylbenzenesulfonate salt anionic surfactant.
However, it is recognized by ordinary persons skilled in the art that it is technically difficult to obtain a liquid detergent by mixing the conventional liquid agent having the above-described composition and sodium silicate together. In fact, when they are mixed together, a severe reaction takes place to bring about gelation. Thus, at present, as a detergent containing an alkylbenzenesulfonate salt anionic surfactant and sodium silicate, only the powdery detergent is produced by utilizing the gelation reaction.
In order to produce the powdery detergent, it is necessary to dry the gel and make it into powder, thus increasing the production cost. In addition, in some cases, the powder detergent does not dissolve into cleaning water depending upon the temperatures at use. The undissolved detergent powder may remain to be attached to an article to be washed, such as a cloth. Such remaining detergent may cause a skin affection such as skin allergy to a person who wears the cloth.
It is therefore an object of the present invention to provide a clear liquid detergent which contains is sodium silicate together with alkylbenzenesulfonate salt anionic surfactant, which cannot be achieved by the conventional technique, and which can be diluted and dissolved easily into water and does not generate a precipitate or become cloudy over a long period of time.
DISCLOSURE OF THE INVENTION
The present inventors conducted intensive studies for a long period of time in an attempt to develop a clear or transparent liquid detergent containing an alkylbenzenesulfonate salt anionic surfactant and liquid sodium silicate, and found at last that the alkylbenzenesulfonate salt anionic surfactant and sodium silicate can form, in water, the target clear liquid detergent in the co-presence of polyoxyethylene alkyl or aryl ether nonionic surfactant and alkylethersulfate salt anionic surfactant, which has led to the present invention.
Thus, according to the present invention, there is provided a clear liquid detergent containing an alkylbenzenesulfonate salt anionic surfactant, liquid sodium silicate, a polyoxyethylene alkyl or aryl ether nonionic surfactant, and an alkylethersulfate salt anionic surfactant in water. The clear liquid detergent may also contain a fluorosurfactant.
In the clear liquid detergent of the present invention, it is preferred that the alkylbenzenesulfonate salt be contained in an amount of about 5 to about 15.5% by weight, and the sodium silicate be contained in an amount of about 1 to about 7.5% by weight. In the clear liquid detergent of the present invention, it is preferred that the polyoxyethylene alkyl or aryl ether nonionic surfactant be contained in an amount of about 1 to about 10% by weight, and the alkylethersulfate salt anionic surfactant be contained in an amount of about 1 to about 15% by weight. The fluorosurfactant, if it is added, should be contained in the clear liquid detergent of the present invention preferably in an amount of 0.01 to 0.1% by weight, more preferably in an amount of 0.01 to 0.09% by weight.
The clear liquid detergent of the present invention may further contain a metal-chelating agent, a pH adjusting agent and a freezing/clouding inhibitor. In such a case, it is preferred that the metal-chelating agent be contained in an amount of about 0.5 to about 3% by weight, the pH adjusting agent be contained in an amount of about 0.05 to about 5% by weight, and the freezing/clouding agent be contained in an amount of about 0.1 to about 3% by weight.
Further, according to the present invention, there is provided a clear liquid detergent prepared by blending liquid sodium silicate in an amount of about 1 to about 7.5% by weight, a metal-chelating agent in an amount of about 0.5 to about 3% by weight, a pH adjusting agent in an amount of about 0.05 to about 5% by weight, an alkylbenzenesulfonic acid in an amount of about 5 to about 15% by weight, an alkali metal hydroxide, as a neutralizing agent for the alkylbenzenesulfonic acid, in an amount of about 1 to about 4.5% by weight, a fluorosurfactant in an amount of 0 to about 0.1% by weight, a polyoxyethylene alkyl or aryl ether nonionic surfactant in an amount of about 1 to about 10% by weight, an alkylethersulfate salt anionic surfactant in an amount of about 1 to about 15% by weight, a freezing/clouding inhibitor in an amount of about 0.1 to about 3% by weight, and the balance of water.
Furthermore, according to the present invention, there is provided a clear liquid detergent prepared by blending liquid sodium silicate in an amount of about 1 to about 6% by weight, a metal-chelating agent in an amount of about 0.5 to about 2.5% by weight, a pH adjusting agent in an amount of about 0.05 to about 4% by weight, an alkylbenzenesulfonic acid in an amount of about 5 to about 12.5% by weight, an alkali metal hydroxide, as a neutralizing agent for the alkylbenzenesulfonic acid, in an amount of about 1 to about 4% by weight, a fluorosurfactant in an amount of 0 to about 0.09% by weight, a polyoxyethylene alkyl or aryl ether nonionic surfactant in an amount of 1 to 8.5% by weight, an alkylethersulfate salt anionic surfactant in an amount of about 1 to about 14% by weight, a freezing/clouding inhibitor in an amount of about 0.1 to about 2.5% by weight, and the balance of water.
Furthermore, according to the present invention, there is provided a clear liquid detergent prepared by adding, to (1) a mixed surfactant aqueous solution containing a polyoxyethylene alkyl or aryl ether nonionic surfactant, a freezing/clouding inhibitor, an alkylethersulfate salt anionic surfactant and water, (2) a sodium silicate aqueous solution containing liquid sodium silicate, a metal-chelating agent, a pH adjusting agent and water; and adding, to the resultant mixture, (3) an alkylbenzenesulfonate salt anionic surfactant aqueous solution prepared by adding water and an alkali metal hydroxide as a neutralizing agent to an alkylbenzenesulfonic acid.
The clear liquid detergent of the present invention preferably contains the alkylbenzenesulfon
Uno Hisashi
Uno Minoru
Uno Tsutomu
Ogden Necholus
Pennie & Edmonds LLP
Uno Shoyu Co., Ltd.
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