Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1995-01-26
1996-09-17
Pal, Asok
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
510470, 510508, 510405, 252351, 252352, C11D 166, C11D 302, C11D 702
Patent
active
055565735
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a process for the production of storable nonionic surfactants with improved resistance to crystallization, in which selected crystallization moderators are added to alk(en)yl oligoglycosides.
2. Statement of Related Art
Alk(en)yl oligoglycosides are important nonionic surfactants which are being used to an increasing extent in laundry detergents, dishwashing detergents and cleaning products by virtue of their favorable detergent properties and their high ecological compatibility.
For this purpose, alk(en)yl oligoglycosides have to be kept available and stored, for example as aqueous solutions or pastes, for certain periods pending final processing. However, since aqueous alk(en)yl oligoglycosides have a pronounced tendency towards crystallization, the homogeneity of such preparations gradually decreases during storage under ambient conditions, resulting in the formation of agglomerates containing water of crystallization which reduce the pumpability of the products to a considerable extent.
Accordingly, alk(en)yl oligoglycosides are not normally stored at room temperature, but at temperatures of at least 40.degree. C. Although the preparations can largely be prevented from crystallizing in this way, storage at elevated temperatures involves additional costs and, moreover, can seriously affect the color quality of the products.
Accordingly, the problem addressed by the present invention was to provide a process by which alk(en)yl oligoglycosides could be stored at temperatures below 40.degree. C. without the pumpability of the products being impaired by the formation of crystalline agglomerates.
DESCRIPTION OF THE INVENTION
The present invention relates to a process for the production of storable nonionic surfactants, in which crystallization moderators selected from the group consisting of oligoglycosides corresponding to formula (I): 22 carbon atoms, G is a sugar unit containing 5 or 6 carbon atoms and p is a number of 1 to 10.
It has surprisingly been found that the tendency of the alk(en)yl oligoglucosides towards crystallization can be greatly reduced by adding small quantities of selected moderators to them. Aqueous preparations which remain stable in storage and color-stable for months at temperatures around 30.degree. C. and which have hardly any tendency towards crystallization are obtained in this way.
Alkyl and alkenyl oligoglycosides are known substances which may be obtained by the relevant methods of preparative organic chemistry. EP-A1-0 301 298 and WO 90/3977 are cited as representative of the extensive literature available on this subject.
The alkyl and/or alkenyl oligoglycosides may be derived from aldoses or ketoses containing 5 or 6 carbon atoms, preferably glucose. Accordingly, the preferred alkyl and/or alkenyl oligoglycosides are alkyl and/or alkenyl oligoglucosides.
The index p in general formula (I) indicates the degree of oligomerization (DP degree), i.e. the distribution of mono- and oligoglycosides, and is a number of 1 to 10. Whereas p in a given compound must always be an integer and, above all, may assume a value of 1 to 6, the value p for a certain alkyl oligoglycoside is an analytically determined calculated quantity which is generally a broken number. Alkyl and/or alkenyl oligoglycosides having an average degree of oligomerization p of 1.1 to 3.0 are preferably used. Alkyl and/or alkenyl oligoglycosides having a degree of oligomerization of less than 1.7 and, more particularly, between 1.2 and 1.4 are preferred from the applicational point of view.
The alkyl or alkenyl radical R.sup.1 may be derived from primary alcohols containing 4 to 11 and preferably 8 to 10 carbon atoms. Typical examples are butanol, caproic alcohol, caprylic alcohol, capric alcohol and undecyl alcohol and the technical mixtures thereof obtained, for example, in the hydrogenation of technical fatty acid methyl esters or in the hydrogenation of aldehydes from Roelen's oxo synthesis. Alkyl oligoglucosides having a chain l
REFERENCES:
patent: H171 (1986-12-01), McDaniel et al.
patent: 2596093 (1952-05-01), de Benneville
patent: 2601329 (1952-06-01), Sanders et al.
patent: 2888489 (1959-05-01), Horsley et al.
patent: 3382285 (1968-05-01), Egan et al.
patent: 3865754 (1975-02-01), Norris et al.
patent: 5169553 (1992-12-01), Durbut et al.
patent: 5230835 (1993-07-01), Deguchi et al.
patent: 5318715 (1994-06-01), Krishnan
patent: 5370816 (1994-12-01), Balzer et al.
Engels Thomas
Hensen Herman
Nickel Dieter
Tesmann Holger
Weuthen Manfred
Drach John E.
Hailey Patricia L.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Millson Jr. Henry E.
LandOfFree
Process for the production of storable nonionic surfactants does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of storable nonionic surfactants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of storable nonionic surfactants will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-411252