Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Inorganic silicon containing component
Reexamination Certificate
2001-06-07
2004-03-02
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Inorganic silicon containing component
C510S276000, C510S315000, C510S323000, C510S338000, C510S405000, C510S407000, C510S434000, C510S475000, C510S477000, C510S485000, C510S486000, C510S507000, C510S531000, C510S532000
Reexamination Certificate
active
06699831
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a liquid detergent composition useful in a wide variety of art fields such as cleaners including a washing detergent for fiber goods, a kitchen detergent, a household detergent and a hard-surface-washing detergent and a liquid cleanser.
PRIOR ARTS
The liquid detergent has such an advantage that it is generally superior in water solubility to powdery detergents, it is directly applicable to dirty portions, it needs no drying in production procedures, it can be compounded with thermally instable materials which cannot be incorporated into powdery detergents and it does not require any complicated instrument such as drying facilities.
Incorporation of an alkaline agent, a calcium scavenger, a bleaching agent, an enzyme, an abrasive etc. into the liquid detergent has been desired for supplementary effects. A liquid detergent containing solid components, however, maybe involved easily in problems such that the solid components precipitate and separate in storage, not easily re-dispersed again, and the product will have too high a viscosity to be easily poured into a laundry tank. In order to prevent the solid components from precipitating, increasing the viscosity of the liquid phase or reducing the particle diameter of solid matter has been used. Increasing the viscosity, however, is limited for pouring. It cannot assure a stable dispersion to reduce simply the particle diameter of the solid.
For the purpose of stabilizing a dispersion of solid components, it is known to use a polymeric dispersant to a liquid detergent composition: a copolymer of maleic anhydride and ethylene or vinyl methyl ether hydrolyzed at least at 30% in JP-B 60-39319; a polymer containing an amphiphatic carboxy group in JP-A 3-86800; a copolymer comprising a monomer containing a group being capable of extending from the surface of the solid phase and a monomer containing a group being capable of associating with the solid phase in JP-A 5-140599; and a polymer comprising a monomer showing self-association in the liquid phase and a monomer being soluble in the liquid phase in JP-A 7-508781. However, the solid components used in those reference compositions are stabilized with polymer network, but not satisfactory in dispersion stability.
DISCLOSURE OF INVENTION
The purpose of the present invention is to provide a liquid detergent composition being excellent in detergency and dispersion stability.
The inventors have found that the detergency is increased with a polymeric dispersant having a large cation exchanging capacity, that is, having a high calcium-capturing ability and an excellent stability is obtained with a polymeric dispersant having a good affinity with both liquid phase and solid phase.
When the water content of a detergent composition is 5 wt. % or less, a crystalline silicate compound works as an excellent alkaline agent and calcium-capturing agent. Therefore it has been found that an increased detergency and an excellent stability can be obtained with a polymeric dispersant having a good affinity with both liquid phase and solid phase.
The invention provides a liquid detergent composition, having a degree of separation by volume of 5% or less after 1 month of storage at 25° C., comprising a liquid phase as the phase (a), a polymeric dispersant as the component (b) and at least one selected from the group consisting of a crystalline silicate compound and an aluminosilicate compound as the component (c), wherein the component (b) has a cation exchange capacity of not less than 120 CaCO
3
mg/g when the water content of the composition is 5% by weight or less and then the aluminosilicate compound only is used as the component (c) or when the water content of the composition is larger than 5% by weight.
It is preferable that the content of the phase (a) is 30 to 95% by weight of the composition; the phase (a) comprises 10 to 100% by weight of a surfactant; the content of the component (b) is 0.1 to 10% by weight of the composition; the content of the component (c) is 3 to 69.9% by weight of the composition; the component (b) is a polymer consisting of 2 or more kinds of polymer chains; the component (b) is a block or graft polymer consisting of a polymer chain 1 being soluble or uniformly dispersible in the phase (a) and a polymer chain 2 having a functional group having a good affinity with the component (c); or the component (c) is the crystalline silicate compound.
The invention provides a process for producing the liquid detergent composition as defined above, which comprises a step of wet grinding the components (b) and (c) in the phase (a) to obtain a slurry of finely pulverized solid components.
The process may preferably comprise steps of wet grinding the component (c) in the phase (a) to obtain a slurry of finely pulverized solid component and adding the component (b) to the slurry. It is preferable in the process that the total volume of the phase (a), the component (c) and other solid components is 0.9 to 1.1 times as much as the volume of gaps of media introduced into a media mill at the step of the wet grinding.
DETAILED DESCRIPTION OF INVENTION
Phase (a): Liquid Phase
The content of the phase (a) as the liquid phase of the liquid detergent composition is preferably 30 to 95% by weight, more preferably 40 to 90% by weight. The content of the phase (a) can be determined by sedimenting the solid of the liquid detergent composition (separating conditions: 10,000 rpm, 30 minutes, 25° C.) with a centrifuge, himac CR22F (tradename) produced by Hitachi, Ltd., and then quantifying the filtrate from which the sedimented components have been removed through a 0.1 &mgr;m membrane filter at 25° C., made of PTFE, produced by ADVANTEC Co., Ltd.
The phase (a) comprises a surfactant as an essential ingredient and if necessary water and a water-soluble organic solvent. The phase (a) may contain water. In order to compact the detergent composition, however, the content of water of the phase (a) may be preferably 60% by weight or less and the phase (a) may be more preferably a non-aqueous liquid phase not containing water substantially. The non-aqueous liquid system means that water is not intentionally added and further the content of water of the liquid detergent composition is preferably 5% by weight or less, more preferably 2% by weight or less.
The content of the surfactant of the phase (a) is preferably 10 to 100% by weight, more preferably 50 to 100% by weight or particularly preferably 60 to 100% by weight.
The surfactant is preferably a nonionic surfactant. Insofar as the stability of the product is not deteriorated, an anionic surfactant, a cationic surfactant or an amphoteric surfactant may be used with the nonionic surfactant by dissolving it in the phase (a). The phase (a) is also preferably a nonionic surfactant.
a-1: Nonionic Surfactant
A nonionic surfactant is conventionally incorporated for use in a detergent composition and advantageously provides an excellent detergency and stability. The content of the nonionic surfactant in the surfactants is preferably 70 to 100% by weight, more preferably 90 to 100% by weight and particularly preferably 100% by weight.
As the nonionic surfactant, the known nonionic surfactants described in e.g. “3-1. Collection of Well Known and Customary Techniques (Powder Detergent for Clothing)” published by the Japanese Patent Office can be used.
In the liquid detergent composition of the present invention, it is particularly preferable to use a polyethylene oxide- and/or polypropylene oxide-including nonionic surfactant. It is in particular at least one selected from a polyoxyethylene alkyl ether comprising 5 to 20 moles on the average of ethylene oxide added to a C
8-18
linear or branched, primary or secondary alcohol and a polyoxyethylene polyoxypropylene alkyl ether comprising 5 to 15 moles on the average of ethylene oxide and 1 to 5 moles on the average of propylene oxide added thereto, the ethylene oxide and propylene oxide having been added in random or in block.
As other nonionic surfactants, it is also
Ishikawa Akira
Oda Takashi
Takano Tomoe
Takiguchi Osamu
Yui Koji
Birch & Stewart Kolasch & Birch, LLP
Boyer Charles
Kao Corporation
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