Compositions – Electrolytes for electrical devices
Patent
1992-11-17
1993-12-28
Albrecht, Dennis
Compositions
Electrolytes for electrical devices
8111, 252 891, 252 96, 252 97, 252 99, 252104, 252139, 252173, 25217412, 25218638, 252DIG14, 422 29, A61K 3119, C11D 3395, C11D 754, D06L 302
Patent
active
052736741
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the use of 2,5-diacyloxy-2,5-dihydrofurans as activators for inorganic peroxides and to detergents, cleaning preparations and disinfectants containing these activators.
2. Discussion of Related Art
Inorganic per compounds, more particularly hydrogen peroxide and solid per compounds which dissolve in water with evolution of hydrogen peroxide, such as sodium perborate and sodium carbonate perhydrate, have long been used as oxidizing agents for disinfection and bleaching purposes. The oxidizing effect of these substances in dilute solutions depends to a large extent on temperature. Thus, with H.sub.2 O.sub.2 or perborate, for example, sufficiently rapid bleaching of soiled textiles in alkaline bleaching liquors is only achieved at temperatures above approximately 80.degree. C. At lower temperatures, the oxidizing effect of the inorganic per compounds can be improved by addition of so-called activators, for which numerous proposals have been made in the literature, above all from the classes of N- or O-acyl compounds, for example polyacylated alkylenediamines, more particularly tetraacetyl ethylenediamine, acylated glycol urils, more particularly tetraacetyl glycol uril, N-acylated hydantoins, hydrazides, triazoles, urazoles, diketopiperazines, sulfuryl amides and cyanurates, also carboxylic anhydrides, more particularly phthalic anhydride, carboxylic acid esters, more particularly sodium isononanoyl phenyl sulfonate and acylated sugar derivatives, such as pentaacetyl glucose. The bleaching effect of water-based peroxide liquors can be increased by addition of these substances to such an extent that substantially the same effects are obtained at temperatures as low as 60.degree. C. as are obtained with the peroxide liquor alone at 95.degree. C.
In the efforts being made to develop energy-saving washing and bleaching processes, application temperatures well below 60.degree. C. and, more particularly, below 45.degree. C. down to the temperature of cold water have acquired increasing significance in recent years.
Unfortunately, the effect of hitherto known activators clearly diminishes at these low temperatures. Accordingly, there has been no shortage of attempts to develop more effective activators for this temperature range although there has not yet been any evidence of real success. The problem addressed by the present invention also was to improve the oxidizing and bleaching effect of inorganic per compounds at low temperatures below 80.degree. C. and, more particularly, in the range from about 15.degree. C. to 45.degree. C.
DESCRIPTION OF THE INVENTION
Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients or reaction conditions used herein are to be understood as modified in all instances by the term "about".
It has now been found that a remarkable increase in the oxidizing and bleaching effect of inorganic per compounds in oxidation, bleaching and wash liquors is achieved in this temperature range by the use of certain 2,5-diacyl-oxy-2,5-dihydrofurans as activators. The activators in question are substances selected from compounds corresponding to formula (I) ##STR2## in which R is a C.sub.1-8 alkyl radical or the phenyl radical, and mixtures thereof. Compounds corresponding to formula (I), in which R=C.sub.1-4 alkyl, and mixtures thereof are particularly preferred. The present invention also relates to detergents, cleaning preparations and disinfectants containing such activators and to a process for activating inorganic per compounds.
The 2,5-diacyloxy-2,5-dihydrofurans corresponding to formula (I) to be used in accordance with the invention may be produced by chemical or electrochemical oxidation of furan by processes known in principle, for example as described in DE-OS 26 01 543, in GB-PSS 642,277 and 703,297, by N. Elming and N. Clauson-Kaas in Acta Chem. Scand. 6 (1952), 535 or by A.J. Baggaley and R. Brettle in J. Chem. Soc. (C) 1968, 969.
In the process
REFERENCES:
patent: 4107065 (1984-11-01), Gray
patent: 4483778 (1984-11-01), Thompson
patent: 4536314 (1985-08-01), Hardy
Kottwitz Beatrix
Lehmann Rudolf
Merz Thomas
Albrecht Dennis
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
LandOfFree
2,5-diacyloxy-2,5-dihydrofuran activators for inorganic per comp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with 2,5-diacyloxy-2,5-dihydrofuran activators for inorganic per comp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 2,5-diacyloxy-2,5-dihydrofuran activators for inorganic per comp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1540687