Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1995-11-14
1998-11-24
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510101, 510102, 510103, 510104, 510105, 510106, 510107, 510349, 510438, 510441, 510446, 510466, A61K 700, C11D 308, C11D 350
Patent
active
058406689
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to perfumed laundry detergent powders and to perfume-on-carrier systems for incorporation into laundry detergent powders.
BACKGROUND OF THE INVENTION
Detergent powders for laundry use span a wide range of compositions. Traditional (or "regular") products are typified by a detergent surfactant level of between 8% and 20% by weight in total, more commonly 10% to 15%. The surfactants may be anionic, non-ionic, cationic, zwitterionic or amphoteric in nature, and commercial products may contain all classes of surfactants, but the predominant form is generally anionic (i.e. anionic surfactants typically account for 50% or more of the total surfactants). Typical detergent surfactants are described in detail in "Surfactant Surface Agents and Detergents", volume II by Schwartz, Perry and Birch, Interscience Publishers (1958). The remainder of a laundry detergent composition generally comprises builders, fillers, moisture, soil release and soil suspension and anti-redeposition agents, and other optional adjuncts such as processing aids, optical brighteners, dyes, foam control agents, anti-corrosion agents, perfumes, pH control agents, enzymes, stabilisers, bleaches and bleach activators. The level of solid components in regular laundry detergent compositions is high, usually above 75%, often above 85%. Perfume loadings for such compositions are generally within the range 0.05% to 0.4%, more commonly 0.1% to 0.3%, and the ratio of solid constituents to organic liquid constituents in a regular detergent composition is usually at least 30:1, and is likely in practice to be considerable higher, e.g. at least 150:1 and up to 500:1.
Laundry detergent powder concentrates and hyperconcentrates (for the purposes of this specification further referred to as "concentrates") represent a relatively new product segment which is assuming increasing commercial importance world-wide. These concentrated products have a rather different composition to that described above.
The total level of detergent surfactants in concentrates generally lies within the range 15% to 60% by weight of the powder, more usually 20% to 40%. In addition to the difference in the level of surfactants another major point of difference concerns the level of low-functionality materials such as fillers. In concentrates the level of sodium sulphate for example, is rarely above 6% or even 2% by weight, whereas in regular powders levels of 20% to 30% are common. The composition of the actives may be similar to that in regular products, i.e. predominantly anionics, but not restricted to this and, for example, a high proportion of non-ionics may be used advantageously. The use of higher proportions of non-ionic surfactants is reported to be a significant trend in the detergent industry, at least for Europe, as reported by Smulders and Krings (Chemistry and Industry, March 1990, pages 160 to 163). Examples of detergent powder formulations with high non-ionics levels are disclosed in EP 228011, EP 168102, EP 425277, and EP 120492. Many non-ionic surfactants are liquid at ambient temperatures. Yet another difference between "regulars" and concentrates is that the percentage of perfume incorporated into concentrates tends to be higher than that for regular powder use, and lies generally above 0.1% by weight, normally within the range 0.4% to 2.5% by weight of the powder, more typically 0.5% to 1.5%.
Thus a concentrate may be defined for the purposes of the present specification as comprising at least 15% (and preferably at least 20%) w/w total surfactant actives and at least 0.1% w/w perfume, preferably at least 0.4% w/w. A consequence of these differences between regulars and concentrates is that the ratio of total solid to total organic liquid components for certain concentrates may be less than 30:1, or even less than 10:1, and problems can arise in manufacture and storage of the product due to "stickiness" and lump formation. In particular, for concentrates incorporating relatively high levels of liquid non-ionic surfa
REFERENCES:
patent: 4394127 (1983-07-01), Melville et al.
patent: 4954285 (1990-09-01), Wierenga et al.
patent: 4973422 (1990-11-01), Schmidt
patent: 5336665 (1994-08-01), Garner-Grey et al.
patent: 5691303 (1997-11-01), Pan et al.
Chemical Abstracts, vol. 115, No. 6, Aug. 12, 1991, abstract No. 52294m, K.Mizuo "Granular Laundry detergent compositions having high bulk density and containing perfumes for fabrics", p. 148; see abstract & JP, A, 03 035 100, 15 Feb. 1991.
Behan John Martin
Birch Richard Arthur
Leake John
Ness Jeremy Nicholas
Nock Anthony
Fries Kery A.
Lieberman Paul
Quest International B.V.
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