Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-01-31
1998-10-20
McAvoy, Ellen M.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510351, 510352, C11D 1700
Patent
active
058246339
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to heterogeneous surfactant granules with an inner core consisting of relatively long-chain alkyl sulfates or mixtures thereof with relatively short-chain homologs or alkyl ether sulfates and of a coating of relatively short-chain alkyl sulfates. The present invention also relates to a process for the production of the heterogeneous surfactant granules.
2. Discussion of Related Art
Anionic surfactants, more particularly alkyl sulfates or fatty alcohol sulfates, are important components of laundry detergents, dishwashing detergents and cleaning compositions. In contrast to nonionic surfactants which show inverse solubility behavior and better solubility in cold water than in warm water through the presence of hydrogen bridge bonds, anionic surfactants exhibit conventional behavior, i.e. their solubility increases more or less linearly with temperature until the solubility product is reached. However, for technical applications, for example with regard to dispensing behavior during the washing process, there is a need for anionic surfactants which also show adequate solubility in cold water.
There has been no shortage of attempts in the past to solve the problem posed by the inadequate solubility of anionic surfactants, particularly alkyl benzene sulfonates, fatty alcohol sulfates and a-methyl ester sulfonates, in cold water. These efforts have largely been based on two concepts, namely:
The most well-known hydrotropes undoubtedly include the short-chain alkylaryl sulfonates such as, for example, toluene, xylene or cumene sulfonate. They are suitable, for example, as solubilizers for anionic and nonionic surfactants in the production of liquid detergents. The improved solubility is probably attributable to advantageous mixed micelle formation. Reference is made in this connection to the review by H. Stache in Fette, Seifen, Anstrichmitt. 71, 381 (1969).
However, the improvement in cold water solubility, particularly in the case of fatty alcohol sulfates, is normally achieved by adding surfactants with high HLB values, for example highly ethoxylated polyglycol ethers (tallow alcohol 40 EO adduct) or the like, to them as hydrotropes. However, the dissolving rates obtainable in this way, particularly in the case of fatty alcohol sulfates, are unsatisfactory for a number of technical applications.
A totally different approach for improving the solubility of anionic surfactants is described in German patent application DE-A1 4030688 (Henkel) where it is proposed to dry water-containing surfactant pastes with superheated steam. Through the condensation of the superheated steam on the cooler starting material and release of the heat of condensation to the material to be dried, the surfactant droplets are spontaneously heated to the boiling temperature of the water. As a result, a plurality of fine channels is formed in the surfactant granule as the water escapes. The large inner surface obtained in this way leads to a considerably improved dissolving rate, for example by comparison with conventionally spray-dried products. Nevertheless, the described process is attended by the disadvantage of high outlay on equipment.
According to DE-A1 4124701 (Henkel), solid detergents of high apparent density and improved solubility are obtained by adding polyethylene glycol ethers with a molecular weight of 200 to 12,000 and preferably 200 to 600 to mixtures of anionic and nonionic surfactants and then drying and/or solidifying the resulting mixtures. Example 1 discloses a detergent formulation containing C.sub.12/18 fatty alcohol sulfate, C.sub.12/18 fatty alcohol 5 EO/C.sub.16/18 tallow fatty alcohol 5 EO adduct and--based on the nonionic surfactants--not less than 45% by weight of polyethylene glycol with a molecular weight of around 400 which, after homogenization, is extruded and processed to granules. Unfortunately, the dissolving rate of the solid detergents obtained is still not satisfactory. In addition, the presence of the large quantities o
REFERENCES:
patent: 4731195 (1988-03-01), Olson
patent: 4826632 (1989-05-01), Blackburn et al.
patent: 5215683 (1993-06-01), Kravetz et al.
patent: 5399297 (1995-03-01), Panthal et al.
patent: 5443751 (1995-08-01), Mazzola
patent: 5482646 (1996-01-01), Mazzola
Kischkel Ditmar
Krohnen Thomas
Schmid Karl
Syldath Andreas
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
McAvoy Ellen M.
Szoke Ernest G.
LandOfFree
Heterogeneous surfactant granules does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Heterogeneous surfactant granules, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heterogeneous surfactant granules will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-244211