Bleaching and dyeing; fluid treatment and chemical modification – Cleaning or laundering – Removing formation impurities from artifical fiber
Patent
1997-05-01
1999-11-09
Diamond, Alan
Bleaching and dyeing; fluid treatment and chemical modification
Cleaning or laundering
Removing formation impurities from artifical fiber
510531, 510532, 510535, 510441, 510445, 510438, 510349, 510276, 510353, 510356, 510360, 510357, C11D 1700, C11D 308, C11D 310, D06L 116
Patent
active
059805803
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a washing method and a detergent composition. More specifically, the present invention relates to a washing method having excellent detergency even with a low surfactant concentration in the washing liquid by decreasing water hardness of the washing liquid before increasing pH of the washing liquid, and a detergent composition.
BACKGROUND ART
Generally, it is known that the addition of metal ion capturing agents, such as zeolites, to detergents reduces the effects of calcium ions and magnesium ions in tap water on surfactants, thereby removing dirt stains adhered to clothes, while the detergents inhibiting redeposition owing to freed dirt stains by making the washing liquid alkaline to increase dispersion of the dirt stains.
Therefore, in general, conventional detergent granules include alkalizing agents and metal ion capturing agents. The detergent granules are generally produced by the following method.
Specifically, a slurry comprising aqueous dispersion of surfactants, mainly comprising anionic surfactants and nonionic surfactant; alkalizing agents, such as sodium carbonate and sodium silicates; calcium ion capturing agents (metal ion capturing agents), such as zeolites and sodium tripolyphosphates; fillers, such as sodium sulfate; and other components (those which are stable against heat) is prepared. Thereafter, the resulting slurry is dried to be powdered. Subsequently, materials which are unstable against heat including perfumes, and in certain cases, bleaching agents and bleaching activators are post-blended, to give desired detergent granules.
Incidentally, phosphorus-based metal ion capturing agents typically exemplified by tripolyphosphates have been formulated in dry granules, the tripolyphosphates being generally employed as calcium ion capturing agents before the use of zeolites. This is due to the fact that the phosphorus-based metal ion capturing agents have a function of alkalizing agents besides the calcium ion capturing capacity and also have the most suitable properties for improvement in powder properties, such as flowability, of the dry granules.
In the detergent granules mentioned above, since the alkalizing agents, such as alkali metal carbonates and alkali metal silicates, also have the characteristics of improving flowability by mechanically strengthening the granules themselves, the alkalizing agents act to form into granules with surfactants having plasticity and zeolite fine particles, so that the alkalizing agents are generally included in the same granules as the surfactants and the zeolites.
As mentioned above, since the metal ion capturing agents and the alkalizing agents are formulated in the same granule in the conventional detergents, the dissolution of these components may simultaneously show alkalizing ability and metal ion capturing capacity in the washing liquid. In certain cases, the alkalizing ability is shown earlier than the metal ion capturing capacity because the rate of reaction of the metal ion capturing agents with calcium ions and magnesium ions in water is delayed more than the rate of reaction of an alkalizing agent and water. The same can be said for liquid detergents, and since the metal ion capturing agents and the alkalizing agents are mixed in the same liquid, the alkalizing ability and the metal ion capturing capacity may be simultaneously shown, or the alkalizing ability is shown earlier than the metal ion capturing capacity.
Aside from the above, most man-derived sebum dirt stains contain fatty acids. In the process of washing, calcium and magnesium together with fatty acids form a scum, thereby lowering solubility and inhibiting the dispersion of the dirt stains in water. In particular, the present inventors have found that the scum-formation rate becomes faster as the alkalization degree (pH) becomes higher, and that washing performance cannot be exhibited to its optimum in conventional washing methods.
On the other hand, besides ones mentioned above, several methods comprising dry-blending a
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Kasai Katsuhiko
Tamura Shigeru
Tsumadori Masaki
Yamaguchi Shu
Yamaguchi Yoko
Diamond Alan
Kao Corporation
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