Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1994-06-01
1995-09-26
Albrecht, Dennis
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
252173, 25217417, 25217423, 25218626, 25218642, 252DIG14, 264117, 264118, C11D 332, C11D 3395, C11D 1100, C11D 1708
Patent
active
054532140
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for agglomeration of amidoperoxyacids which leads to improved rheological properties of suspensions made from these agglomerated peroxyacids. The invention further relates to agglomerates made using this process, as well as a process for making suspensions which embodies the agglomeration process and to suspensions made from these agglomerates.
BACKGROUND OF THE INVENTION
Organic peroxyacids are useful as fabric bleaching agents. As such, they are often formulated in the form of either dry, granular compositions, or aqueous suspensions, either of which products can be used in combination with detergent compositions.
An agglomeration process is known for diperoxydodecanedioic acid from published European Patent application number 0 254 331 wherein a water-impermeable material is employed as the agglomeration agent. These agglomerates are made in aqueous suspension at a temperature above the melting point of the water-impermeable material but below the melting and decomposition temperatures of the peroxyacid.
However, this process suffers from the disadvantage that you must employ a significant amount of a water-impermeable material as a binder material in order to make such agglomerates. Use of a water-impermeable material in making bleaching agents is not always possible or desirable.
Amidoperoxyacids made in accordance with EP 0 349 220 have been successfully suspended in aqueous suspensions but, after short storage periods they were found to be rheologically unstable. More particularly, the amidoperoxyacid underwent a change which led to a significant, undesirable viscosity increase. Since liquid bleaching compositions must remain pourable throughput their useful life. Products which thicken to the point of no longer being readily pourable are not commercially acceptable.
Methods for suspending some peroxyacids are known from published European Patent application number 0 347 988, published European Patent application number 0 435 379, published European Patent application number 0 176 124, published European Patent application 0 160 342 and published European patent application number 0 201 958, among others. However, none of these publications teaches or suggests a method of preparing a suspension of the present amidoperoxyacids which do not undergo a significant viscosity increase upon storage.
Accordingly, there exists a need in the art for rheologically stable suspensions of amidoperoxyacids, as well as a method for making such rheologically stable suspensions without negatively affecting one or more of the other properties of the bleaching materials and without the need for significant quantities of water-impermeable materials.
SUMMARY OF THE INVENTION
The present invention relates to a process for the suspension agglomeration of amidoperoxyacids represented by the formulas I and II: ##STR1## wherein R, is selected from C.sub.1-14 alk(en)yl, ar(en)yl and alkar(en)yl, R.sup.2 is selected from alkyl (ene), aryl(ene) and alkaryl (ene) groups containing from about 1-14 carbon atoms, and R.sup.3 is hydrogen or an alkyl, aryl or an aralkyl group containing from about 1 to about 10 carbon atoms; comprising the steps of:
A. preparing an aqueous suspension having a pH of from 2-6 of a composition comprising at least one of said amidoperoxyacids,
B. agglomerating said aqueous suspension of peroxyacid at a temperature 0-20.degree. C. below the melting point of said peroxyacid composition, and
C. cooling said agglomerated peroxyacid composition to a temperature below 30.degree. C.
The present invention also relates to amidoperoxyacid agglomerates made by this process, a process for making suspensions which employs the aforementioned agglomeration process and to suspensions made from agglomerates which are produced in accordance with the above-described process.
It has surprisingly been found that the agglomeration of amidoperoxyacids at elevated temperature leads to an agglomerate which lends itself to the making of theologically stable suspensi
REFERENCES:
patent: 4179394 (1979-12-01), Dillenburg
patent: 4634551 (1987-01-01), Burns et al.
patent: 4686063 (1987-08-01), Burns et al.
patent: 4818425 (1989-04-01), Meijer
patent: 4909953 (1990-03-01), Sadlowski et al.
patent: 5030381 (1991-07-01), Zimmermann
patent: 5055218 (1991-10-01), Getty
patent: 5126066 (1992-06-01), Torenbeek et al.
patent: 5314639 (1994-05-01), Torenbeek
Research Disclosure No. 193, May, 1980, abstract 19302.
International Search Report dated Sep. 21, 1992.
Hekkert Richard H. J.
van den Berg Rolf H.
Akzo Nobel N.V.
Albrecht Dennis
Mancini Ralph J.
Morris Louis A.
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