Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1995-12-11
1998-01-27
Hertzog, Ardith
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510336, 510352, 510357, 510361, 510404, 510469, 510476, 510478, 510480, 510507, C11D 1100, C11D 320, C11D 337, C11D 1700
Patent
active
057122423
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a high active surfactant paste composition and to high active granular detergent components and compositions which can be made using such paste compositions. The invention also relates to a process for making these pastes, and granular components and compositions.
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 technique 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.
Different approaches to these objectives have been made in the prior art.
U.S. Pat. No. 5,080,848, published on Jan. 14, 1992 describes a process for making surfactant granules typically having an anionic surfactant activity of 50% to 75% (see examples 1 to 8). The process involves chilling and granulating a viscous high active surfactant paste. The granulation may be performed with the aid of some detergency builders (see examples 3 and 4), but the emphasis is on reducing the temperature in order to initiate granulation. The finished detergent composition may contain other optional ingredients including chelating agents, but there is no indication of any advantages of adding solutions of chelating agent and .polymers directly to the paste.
EP 0 508 543, published on Oct. 14, 1992 discloses methods of chemically conditioning high active surfactant pastes in order to achieve high active detergent granules. Phosphonates, polymers and copolymers are disclosed as useful conditioning agents. Conditioning of a paste may be achieved by, for example, increasing paste viscosity and/or drying.
An example of paste conditioning by the addition of powdered co-polymer is given. However there is no suggestion of the benefits of using solutions of chelant and polymer together.
The prior art suggests that in order to maximise the surfactant activity it is necessary to minimise the amount of water in the surfactant paste. This has resulted in the need to handle surfactant pastes having an increasingly high viscosity which imposes limits on the flexibility of the process. However, it has now been found that it is possible to further improve the process in order to make agglomerates which have still higher surfactant activity, and still maintain, or further improve the desired physical characteristics of the granular detergent.
The present invention addresses the problems of how to make higher active surfactant particles than possible using the disclosures in prior art and how to increase the rate of solubility of the resulting particles. There is no need to cool the paste during the granulation step, and the resulting agglomerates have an activity of at least 35%, preferably at least 50%, and more preferably at least 60%.
It has now been surprisingly found that it is advantageous to incorporate a chelating agent and a polymer or co-polymer in the form of an aqueous solution. In particular, it has been found that a narrowly defined ratio of chelating agent to polymer or co-polymer gives the benefits sought.
The present invention allows the handling of paste compositions which contain more water than those of the prior art, which therefore have a correspondingly lower viscosity, and yet still result in granular detergents having a very high surfactant composition.
SUMMARY OF THE INVENTION
A free-flowing granular detergent component or composition having a bulk density of at least 650 g/l
REFERENCES:
patent: 4704233 (1987-11-01), Hartman et al.
patent: 5366652 (1994-11-01), Capeci et al.
patent: 5451354 (1995-09-01), Aouad et al.
patent: 5486303 (1996-01-01), Capeci et al.
patent: 5494599 (1996-02-01), Goovaerts et al.
Angell Adrian John Waynforth
Aouad Yousef Georges
Vega Jose Luis
Hertzog Ardith
Patel K. K.
Rasser J. C.
The Procter & Gamble & Company
Zerby K. W.
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