Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1997-02-24
1998-09-29
Green, Anthony
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510336, 510370, 510373, 510404, 510467, 510477, 510478, 510488, 510489, 510490, 510491, 510492, 510495, 510497, 510498, 510499, 510500, 510504, 510505, 510506, 510507, 510509, 510510, 510535, 510537, C11D 1706, C11D 337, C11D 333
Patent
active
058145966
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to structured surfactant pastes, and to processes for making a high bulk density detergent component by forming a structured surfactant paste, and subsequently granulating the paste to form free-flowing particles having a bulk density of at least 650 g/l.
In recent years there has been a trend towards making granular detergents having a higher bulk density than before. Various techniques of making dense granular detergents, and of processing low density granular detergents in such a way that the bulk density is increased, have been described. One example of a suitable techniques for making dense granular detergents is known as "agglomeration". This term describes any process in which small particles of the components are processed in such a way that they are built-up (or "agglomerated") to form suitable granular components.
The ideal detergent agglomerate should have a high bulk density and a high surfactant content and yet still have good solubility and dispersion properties. It should also be possible to use a manufacturing process which is both efficient and versatile.
The general use of quaternary ammonium compounds as cationic surfactants as components of surfactant agglomerates is disclosed in patent application, EP510746, published on Oct. 28th, 1992. However the cationic surfactants described generally have a low structuring effect, if indeed they have any structuring effect at all.
EP508543 also published on Oct. 28th, 1992 discloses various means for structuring a surfactant paste. It is disclosed that anionic surfactant pastes are preferably structured (i.e. physically/chemically brought into a specific crystalline phase having a high viscosity) prior to high active paste agglomeration. Such a structuring or "conditioning" step enables granulation of the paste to be carried out resulting in very high active surfactant particles. The conditioning step minimises or eliminates problems such as caking and poor rate of solubility. However whilst the conditioning steps described are particularly effective with certain compositions of surfactant pastes, they are less effective with other surfactant compositions.
It is an objective of the present invention to provide structured pastes which are highly suitable for subsequent granulation.
This has been achieved by incorporating polymeric cationic compounds, or polar amino acids into surfactant pastes.
Polymeric cationic compounds are known as components of compositions for textile conditioning and hair conditioning. Typical disclosures are U.S. Pat. No. 4,179,382 and U.S. Pat. No. 5,116,543 which are discussed below. However in neither of these applications is a high active (greater than 35% active by weight) anionic surfactant paste disclosed which is effectively structured by the polymeric cationic compound.
U.S. Pat. No. 4,179,382, published on Dec. 18th, 1979, discloses textile conditioning compositions containing polymeric cationic materials. In addition to the polymeric cationic material, the compositions comprise cationic surfactant and optionally nonionic surfactant. There is no mention of anionic surfactants.
Many compositions of the prior art disclose polymeric cationic materials as active hair conditioning agents. One such example is:
U.S. Pat. No. 5,116,543, published on May 26th, 1992 describes a paste comprising an anionic surfactant, a skin conditioner, a hair conditioner (polymeric cationic material) and a preservative. The paste is for bathing with a small quantity of water in microgravity conditions. Preferred pastes are very viscous and comprise from 15-25% of anionic surfactant and 0.1-3% of polymeric cationic material.
In particular, the present invention offers a method of structuring pastes which have a low amount (or zero) of linear alkyl benzene sulphonate (LAS). LAS has previously been a common surfactant in laundry detergents and methods of effectively structuring LAS have been discussed in the prior art (mentioned above). Now there is a tendency to reduce the level of LAS in favour of other anioni
REFERENCES:
patent: 4551506 (1985-11-01), Gosselink
patent: 5066425 (1991-11-01), Ofosu-Asante et al.
patent: 5152914 (1992-10-01), Forster et al.
patent: 5254333 (1993-10-01), Kajino et al.
Chemical Abstract No. 92:182881 which is an abstract of Japanese Patent Specification No. 54-161607 (Dec. 1979).
Abstract No. 94-156884/19; Granular detergent compsn. having high bulk density and good washability-comprises surfactant(s) alkali metal carbonate, with aluminosilicate salt, polymer and itaconic acid-vinyl pyrrolidone salt as calcium ion arrestors, useful for clothes washing; (Japanese Patent Specification No. JP-06100886) (Apr. 1994).
Aquad Yousef Georges
Pangrle Brian Joseph
Pluyter Johan Gerwijn L.
Green Anthony
Patel Ken K.
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim W.
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