WO2014187485A1 - Stabilization of phthalimido percarboxylic acids with dicarboxylic acids - Google Patents

Stabilization of phthalimido percarboxylic acids with dicarboxylic acids Download PDF

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Publication number
WO2014187485A1
WO2014187485A1 PCT/EP2013/060556 EP2013060556W WO2014187485A1 WO 2014187485 A1 WO2014187485 A1 WO 2014187485A1 EP 2013060556 W EP2013060556 W EP 2013060556W WO 2014187485 A1 WO2014187485 A1 WO 2014187485A1
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acid
phthalimido
composition according
composition
weight
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PCT/EP2013/060556
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French (fr)
Inventor
Amila Bilic
Johannes Georg Winter
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Ecolab Usa Inc.
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Priority to PCT/EP2013/060556 priority Critical patent/WO2014187485A1/en
Publication of WO2014187485A1 publication Critical patent/WO2014187485A1/en

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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • C11D3/2082—Polycarboxylic acids-salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/39—Organic or inorganic per-compounds
    • C11D3/3902—Organic or inorganic per-compounds combined with specific additives
    • C11D3/3937—Stabilising agents
    • C11D3/394—Organic compounds

Definitions

  • the present invention relates to a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxylic acid, to a detergent composition comprising said composition, and to the use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition.
  • Phthalimido percarboxylic acids are used in detergents as bleaching agents and for disinfecting washing.
  • organic peracids have encountered increasing interest in the industrial field, among others due to their excellent properties as bleaching agents in detergent formulations. Therefore, a large number of publications are concerned with organic peracid compounds endowed with the required property of sufficient bleaching activity, said characteristic being essential for an industrial application and a widespread use of such compounds.
  • organic straight-chain or cyclic mono- or dipercarboxylic acids are known and used, e.g. in detergent compositions.
  • boric acid As boric acid has become a chemical of high concern, it is to be expected that boric acid will be banned from use in domestic applications in the near future. Consequently, there is a need for alternative ways of stabilizing phthalimido percarboxylic acids in detergent compositions without making use of boric acid.
  • the present invention satisfies this need by providing a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid.
  • a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid.
  • phthalimido percarboxylic acids can be stabilized by dicarboxyiic acids. This is rather surprising since it was suggested by the prior art that phthalimido percarboxylic acids, if not stabilized, degrade following a radical reaction pathway.
  • phthalimido percaproic acid PAP
  • PAP phthalimido percaproic acid
  • FIG 1 PAP is degraded in alkaline conditions to 4-phthalimido-1-hexanol and carbon dioxide via an electrocyclic reaction.
  • PAP is degraded by an intra molecular reaction: the slightly nucleophilic nitrogen atom of the phthalimide moiety attacks the electrophilic carbon atom of the peracid moiety.
  • the presence of at least one dicarboxyiic acid would prevent nucleophiles from degrading PAP either by excluding reactive nucleophiles, by blocking nucleophilic reaction sites at PAP and/or by catching nucleophiles in their capacity of being electrophiles.
  • the present invention is directed to a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid.
  • a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid.
  • the at least one dicarboxylic acid may be either saturated or unsaturated.
  • the at least one dicarboxylic acid may be aromatic.
  • the present invention also relates to the compositions described above, characterized in that it comprises at least one saturated dicarboxylic acid.
  • the present invention further relates to the composition described above, characterized in that it comprises at least one unsaturated dicarboxylic acid.
  • Suitable dicarboxylic acids for use according to the present invention are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaconic acid, traumatic acid, muconic acid, phthalic acid, isophthalic acid, terephthalic acid and combinations thereof, wherein adipic acid and isophthalic acid represent the most preferred dicarboxylic acids.
  • the present invention also relates to the compositions described above, characterized in that it comprises at least one dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaconic acid, traumatic acid, muconic acid, phthalic acid, isophthalic acid, terephthalic acid and combinations thereof.
  • the present invention further relates to the composition as described above, characterized in that it comprises adipic acid and/or isophthalic acid.
  • Suitable phthalimido percarboxylic acids for use according to the present invention may be selected from the phthalimido
  • phthalimido percaproic acid phthalimido percaproic acid (phthalimido peroxyhexanoic acid, PAP) represents
  • the present invention also relates to the compositions described above, characterized in that it comprises at least one phthalimido percarboxylic acid selected from the phthalimido percarboxylic acids of the general formula (I) above, where n is an integer of from 1 to 5.
  • the present invention further relates to the compositions described above, characterized in that it comprises phthalimido percaproic acid (phthalimido peroxyhexanoic acid, PAP).
  • Phthalimido percarboxylic acids and especially phthalimido peroxycarproic acid may be prepared as described in EP 0 325 288 A1 and EP 0 349 940 B1, respectively.
  • a substrate selected from phthalimido carboxylic acids and anhydrides thereof having a structure corresponding to the desired percarboxylic acid, e.g. of the general formula (I) may be reacted with concentrated H2O2 in a reaction medium selected from concentrated H2SO4 and CH3SO3H or in an alkaline medium, and the
  • percarboxylic acid is then separated from the reaction composition by conventional and known techniques.
  • the content of dicarboxylic acid in the composition should range between 1 and 50 % by weight, preferably between 1 and 25 % by weight, more preferably between 1 and 10 % by weight, most preferably between 2 and 5 % by weight based on the total weight of the composition.
  • the present invention also relates to the compositions described above, characterized in that the content of dicarboxylic acid is between 1 and 50 % by weight, preferably between 1 and 25 % by weight, more preferably between 1 and 10 % by weight, most preferably between 2 and 5 % by weight based on the total weight of the compositions.
  • the weight ratio of phthalimido percarboxylic acid to dicarboxylic acid is between 20:1 and 1 :1 , preferably between 10:1 and 1 :1 , more preferably between 5:1 and 1 :1 , most preferably between 2:1 and 1 :1. Therefore, the present invention also relates to the compositions described above, characterized in that the weight ratio of phthalimido percarboxylic acid to dicarboxylic acid is between 20:1 and 1 :1 , preferably between 10:1 and 1 :1 , more preferably between 5:1 and 1 :1 , most preferably between 2:1 and 1 :1.
  • An especially expedient composition for use as a bleaching agent comprises between 10 and 25 % by weight of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) and between 2 and 5 % by weight of adipic acid or isophthalic acid based on the total weight of the composition.
  • PAP phthalimido percaproic acid
  • the present invention also relates to the composition described above, characterized in that it comprises between 10 and 25 % by weight of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) and between 2 and 5 % by weight of adipic acid or isophthalic acid based on the total weight of the composition.
  • phthalimido percaproic acid phthalimido percaproic acid
  • compositions comprising the at least one phthalimido percarboxylic acid and the at least one dicarboxylic acid according to the present invention may be
  • the present invention also relates to the compositions described above, characterized in that the composition is in the form of a powder, a flake or a solid block.
  • composition according to the present invention is particularly suitable as effective bleaching agent in detergent formulations.
  • the present invention is also directed to the use of a composition described above as a bleaching agent.
  • the present invention is further directed to a detergent composition
  • a detergent composition comprising a composition described above.
  • the detergent composition may contain any additive or active ingredient commonly used in corresponding washing, cleansing and/or disinfecting agents like builders, surfactants, soaps, zeolites, hydrotropic agents, corrosion inhibitors, enzymes, optical brighteners, stabilizers, abrasives, perfumes, coloring agents.
  • inventive composition may be incorporated into the detergent composition either as such or in combination with further additives, for example phosphates, carbonates, zeolites, carboxymethylcellulose or filmbuilding agents like fatty acids, fatty acid amides or esters etc. in the forms mentioned above for the composition.
  • further additives for example phosphates, carbonates, zeolites, carboxymethylcellulose or filmbuilding agents like fatty acids, fatty acid amides or esters etc.
  • the detergent composition is substantially free of boric acid, i.e. comprises less than 10 ppm, preferably less than 5 ppm, even more preferably less than 1 ppm, and most preferably less than 0,1 ppm boric acid.
  • the present invention also relates to the detergent composition described before, characterized in that it comprises less than 10 ppm, preferably less than 5 ppm, even more preferably less than 1 ppm, and most preferably less than 0,1 ppm boric acid.
  • the detergent composition may be used as a laundry detergent, preferably as a textile detergent, and is not only suitable for generally washing laundry, but as well for disinfecting.
  • the detergent according to the present application may be used as cleanser and/or disinfectant for cleansing and disinfecting various kinds of hard surfaces like, for example, in the medicinal or institutional field, in the food preparing, processing and/or selling industry, in agriculture, in hotel business, catering trade and/or in public buildings and/or institutions. It may as well be useful in further applications in which a disinfected surface is required or desired and which are not explicitly mentioned herein.
  • the surfaces supposed to become disinfected may be made of common materials mentioned in the state of the art like, for example, metal, glass, ceramic, plastic, (coated) wood.
  • the present invention relates to the use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition.
  • phthalimido peroxyhexanoic acid phthalimido percaproic acid, PAP
  • PAP phthalimido percaproic acid
  • Eltra 40 is a detergent in powder form which is used for disinfecting washing of laundry.
  • the tested detergent comprises 18,4 wt-% of PAP.
  • the stability over time at 35 °C and 60% humidity was tested by using different dicarboxylic acids as stabilizing agent.
  • boric acid was used as stabilizing agents in the detergent Eltra 40. The following table shows the results.
  • the concentration of the stabilizing agent in the detergent composition was 3,64 wt- %.
  • example 1a isophthalic acid, example 1b adipic acid, example 1c succinic acid and example 1d boric acid (comparative).
  • concentration of chemically active PAP in the respective mixture was determined after storage by 35 °C at 1 , 3, 8, 10, 15, 18, 21 , 24, and 28 days, respectively.
  • a mixture comprising a dicarboxylic acid shows a significantly higher long-term stability of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) than a mixture comprising boric acid (example 1d).
  • Table 1 shows that the stabilization with any of the dicarboxylic acids in examples 1a - c is better than with the stabilizer boric acid in comparative example 1d. Especially after longer storage times of more than 18 days the stabilization with dicarboxylic acids is surprisingly better than with boric acid which is used in the state of art as stabilizing agent.

Abstract

The present invention relates to a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxylic acid, to a detergent composition comprising said composition, and to the use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition.

Description

Stabilization of phthalimido percarboxylic acids with dicarboxylic acids
FIELD OF THE INVENTION
The present invention relates to a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxylic acid, to a detergent composition comprising said composition, and to the use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition. Phthalimido percarboxylic acids are used in detergents as bleaching agents and for disinfecting washing.
BACKGROUND OF THE INVENTION
In the past, organic peracids have encountered increasing interest in the industrial field, among others due to their excellent properties as bleaching agents in detergent formulations. Therefore, a large number of publications are concerned with organic peracid compounds endowed with the required property of sufficient bleaching activity, said characteristic being essential for an industrial application and a widespread use of such compounds. Thus, many organic straight-chain or cyclic mono- or dipercarboxylic acids are known and used, e.g. in detergent compositions.
A problem with the widespread use of organic peracids arises from their low thermal stability, which makes it necessary to physically or chemically stabilize these compounds. The organic peracids known so far show a significant decrease of active oxygen, even under conventional storage conditions. This is also the case with imido percarboxylic acids as described already in J. Chem. Soc. 1962, 3821 and Chem. Ind. 1961 , 469. Among the imido percarboxylic acids, phthalimido percarboxylic acids have gained a widespread use in industry, especially as bleaching agents in detergent compositions. However, addition of boric acid to phthalimido percarboxylic acids is considered necessary to guarantee a sufficient long-term stability.
As boric acid has become a chemical of high concern, it is to be expected that boric acid will be banned from use in domestic applications in the near future. Consequently, there is a need for alternative ways of stabilizing phthalimido percarboxylic acids in detergent compositions without making use of boric acid.
SUMMARY OF THE INVENTION
The present invention satisfies this need by providing a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid. With the present invention, it is possible to stabilize phthalimido percarboxylic acids so as to minimize a decrease of oxygen under conventional storage conditions, but to avoid the use of boric acid. Thus, detergent compositions may be obtained showing sufficient bleaching activity over time.
DETAILED DESCRIPTION OF THE INVENTION
After extensive studies, the inventors have found that phthalimido percarboxylic acids can be stabilized by dicarboxyiic acids. This is rather surprising since it was suggested by the prior art that phthalimido percarboxylic acids, if not stabilized, degrade following a radical reaction pathway.
Without wishing to be bound to any theory, it is assumed that phthalimido
percarboxylic acids in fact degrade under attack of nucleophiles. Two plausible degradation schemes of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) are shown in figures 1 and 2. According to figure 1 , PAP is degraded in alkaline conditions to 4-phthalimido-1-hexanol and carbon dioxide via an electrocyclic reaction. According to figure 2, PAP is degraded by an intra molecular reaction: the slightly nucleophilic nitrogen atom of the phthalimide moiety attacks the electrophilic carbon atom of the peracid moiety. As a consequence, the presence of at least one dicarboxyiic acid would prevent nucleophiles from degrading PAP either by excluding reactive nucleophiles, by blocking nucleophilic reaction sites at PAP and/or by catching nucleophiles in their capacity of being electrophiles.
Therefore, the present invention is directed to a composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxyiic acid. There is no restriction as concerns the chemical nature of the at least one
dicarboxylic acid. Thus, the at least one dicarboxylic acid may be either saturated or unsaturated. Besides, the at least one dicarboxylic acid may be aromatic.
Therefore, the present invention also relates to the compositions described above, characterized in that it comprises at least one saturated dicarboxylic acid. The present invention further relates to the composition described above, characterized in that it comprises at least one unsaturated dicarboxylic acid.
Suitable dicarboxylic acids for use according to the present invention are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaconic acid, traumatic acid, muconic acid, phthalic acid, isophthalic acid, terephthalic acid and combinations thereof, wherein adipic acid and isophthalic acid represent the most preferred dicarboxylic acids.
Therefore, the present invention also relates to the compositions described above, characterized in that it comprises at least one dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaconic acid, traumatic acid, muconic acid, phthalic acid, isophthalic acid, terephthalic acid and combinations thereof. The present invention further relates to the composition as described above, characterized in that it comprises adipic acid and/or isophthalic acid.
Also, there is no restriction as concerns the chemical nature of the at least one phthalimido percarboxylic acid. Suitable phthalimido percarboxylic acids for use according to the present invention may be selected from the phthalimido
percarboxylic acids of the general formula (I), where n is an integer of from 1 to 5:
Figure imgf000004_0001
Thus, suitable phthalimido percarboxylic acids for use according to the present invention may be selected from the group consisting of phthalimido peracetic acid (n=1), phthalimido perpropionic acid (n=2), phthalimido perbutyirc acid (n=3), phthalimido peramylic acid (n=4) and phthalimido percaproic acid (n=5), wherein phthalimido percaproic acid (phthalimido peroxyhexanoic acid, PAP) represents the most preferred phthalimido percarboxylic acid.
Therefore, the present invention also relates to the compositions described above, characterized in that it comprises at least one phthalimido percarboxylic acid selected from the phthalimido percarboxylic acids of the general formula (I) above, where n is an integer of from 1 to 5. The present invention further relates to the compositions described above, characterized in that it comprises phthalimido percaproic acid (phthalimido peroxyhexanoic acid, PAP).
Phthalimido percarboxylic acids and especially phthalimido peroxycarproic acid may be prepared as described in EP 0 325 288 A1 and EP 0 349 940 B1, respectively. Thus, a substrate selected from phthalimido carboxylic acids and anhydrides thereof having a structure corresponding to the desired percarboxylic acid, e.g. of the general formula (I), may be reacted with concentrated H2O2 in a reaction medium selected from concentrated H2SO4 and CH3SO3H or in an alkaline medium, and the
percarboxylic acid is then separated from the reaction composition by conventional and known techniques.
In order to obtain optimum stabilization of the at least one phthalimido percarboxylic acid, the content of dicarboxylic acid in the composition should range between 1 and 50 % by weight, preferably between 1 and 25 % by weight, more preferably between 1 and 10 % by weight, most preferably between 2 and 5 % by weight based on the total weight of the composition.
Therefore, the present invention also relates to the compositions described above, characterized in that the content of dicarboxylic acid is between 1 and 50 % by weight, preferably between 1 and 25 % by weight, more preferably between 1 and 10 % by weight, most preferably between 2 and 5 % by weight based on the total weight of the compositions.
Advantageously, the weight ratio of phthalimido percarboxylic acid to dicarboxylic acid is between 20:1 and 1 :1 , preferably between 10:1 and 1 :1 , more preferably between 5:1 and 1 :1 , most preferably between 2:1 and 1 :1. Therefore, the present invention also relates to the compositions described above, characterized in that the weight ratio of phthalimido percarboxylic acid to dicarboxylic acid is between 20:1 and 1 :1 , preferably between 10:1 and 1 :1 , more preferably between 5:1 and 1 :1 , most preferably between 2:1 and 1 :1.
An especially expedient composition for use as a bleaching agent comprises between 10 and 25 % by weight of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) and between 2 and 5 % by weight of adipic acid or isophthalic acid based on the total weight of the composition.
Therefore, the present invention also relates to the composition described above, characterized in that it comprises between 10 and 25 % by weight of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) and between 2 and 5 % by weight of adipic acid or isophthalic acid based on the total weight of the composition.
The compositions comprising the at least one phthalimido percarboxylic acid and the at least one dicarboxylic acid according to the present invention may be
manufactured in the form of an aqueous solution, gel, emulsion, paste, dispersion, powder, flake, granules, scales, pearls, tablets, solid block form, extrudates and other forms known in the art, but preferably represents a powder, a flake or a solid block. Therefore, the present invention also relates to the compositions described above, characterized in that the composition is in the form of a powder, a flake or a solid block.
The composition according to the present invention is particularly suitable as effective bleaching agent in detergent formulations.
Therefore, the present invention is also directed to the use of a composition described above as a bleaching agent.
The present invention is further directed to a detergent composition comprising a composition described above. The detergent composition may contain any additive or active ingredient commonly used in corresponding washing, cleansing and/or disinfecting agents like builders, surfactants, soaps, zeolites, hydrotropic agents, corrosion inhibitors, enzymes, optical brighteners, stabilizers, abrasives, perfumes, coloring agents.
s The inventive composition may be incorporated into the detergent composition either as such or in combination with further additives, for example phosphates, carbonates, zeolites, carboxymethylcellulose or filmbuilding agents like fatty acids, fatty acid amides or esters etc. in the forms mentioned above for the composition.
It is preferred that the detergent composition is substantially free of boric acid, i.e. comprises less than 10 ppm, preferably less than 5 ppm, even more preferably less than 1 ppm, and most preferably less than 0,1 ppm boric acid.
Therefore, the present invention also relates to the detergent composition described before, characterized in that it comprises less than 10 ppm, preferably less than 5 ppm, even more preferably less than 1 ppm, and most preferably less than 0,1 ppm boric acid.
The detergent composition may be used as a laundry detergent, preferably as a textile detergent, and is not only suitable for generally washing laundry, but as well for disinfecting.
Besides, the detergent according to the present application may be used as cleanser and/or disinfectant for cleansing and disinfecting various kinds of hard surfaces like, for example, in the medicinal or institutional field, in the food preparing, processing and/or selling industry, in agriculture, in hotel business, catering trade and/or in public buildings and/or institutions. It may as well be useful in further applications in which a disinfected surface is required or desired and which are not explicitly mentioned herein. The surfaces supposed to become disinfected may be made of common materials mentioned in the state of the art like, for example, metal, glass, ceramic, plastic, (coated) wood.
Finally, the present invention relates to the use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition.
In the following, the stabilization of phthalimido peroxycarboxylic acids with
dicarboxylic acids will be demonstrated without being restricted to these examples. EXAMPLES
Example 1 :
The stability of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) was tested in a detergent composition Eitra 40 (produced by Ecolab Inc.). Eltra 40 is a detergent in powder form which is used for disinfecting washing of laundry. The tested detergent comprises 18,4 wt-% of PAP. The stability over time at 35 °C and 60% humidity was tested by using different dicarboxylic acids as stabilizing agent. As comparative examples boric acid was used as stabilizing agents in the detergent Eltra 40. The following table shows the results.
The concentration of the stabilizing agent in the detergent composition was 3,64 wt- %. (example 1a: isophthalic acid, example 1b adipic acid, example 1c succinic acid and example 1d boric acid (comparative).. The concentration of chemically active PAP in the respective mixture was determined after storage by 35 °C at 1 , 3, 8, 10, 15, 18, 21 , 24, and 28 days, respectively.
As can be taken from Table 1 , a mixture comprising a dicarboxylic acid (example 1 a- c) shows a significantly higher long-term stability of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) than a mixture comprising boric acid (example 1d).
Table 1 :
Figure imgf000009_0001
Table 1 shows that the stabilization with any of the dicarboxylic acids in examples 1a - c is better than with the stabilizer boric acid in comparative example 1d. Especially after longer storage times of more than 18 days the stabilization with dicarboxylic acids is surprisingly better than with boric acid which is used in the state of art as stabilizing agent.
Similar results were found in an experiment in which pure PAP was directly stabilized with dicarboxylic acids or the comparative stabilizer boric acid.

Claims

1. Composition for use as a bleaching agent comprising at least one phthalimido percarboxylic acid and at least one dicarboxylic acid.
2. Composition according to claim 1 , characterized in that it comprises at least one saturated dicarboxylic acid.
3. Composition according to claim 1 or 2, characterized in that it comprises at least one unsaturated dicarboxylic acid.
4. Composition according to any of claims 1 to 3, characterized in that it
comprises at least one dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaconic acid, traumatic acid, muconic acid, phthalic acid, isophthalic acid, terephthaiic acid and combinations thereof.
5. Composition according to any of claims 1 to 4, characterized in that it
comprises adipic acid and/or isophthah'c acid and/or succinic acid.
6. Composition according to any of claims 1 to 5, characterized in that it
comprises at least one phthalimido percarboxylic acid is selected from the phthalimido percarboxylic acids of the general formula (I)
Figure imgf000010_0001
where n is an integer of from 1 to 5.
7. Composition according to any of claims 1 to 6, characterized in that it
comprises phthalimido peroxyhexanoic acid (phthalimido percaproic acid,
PAP).
8. Composition according to any of claims 1 to 7, characterized in that the content of dicarboxylic acid is between 1 and 50 % by weight, preferably between 1 and 25 % by weight, more preferably between 1 and 10 % by weight, most preferably between 2 and 5 % by weight based on the total weight of the composition.
9. Composition according to any of claims 1 to 8, characterized in that the weight ratio of phthalimido percarboxylic acid to dicarboxylic acid is between 20:1 and 1 :1 , preferably between 10:1 and 1 :1 , more preferably between 5:1 and 1 :1 , most preferably between 2:1 and 1 :1.
10. Composition according to any of claims 1 to 9, characterized in that it
comprises between 10 and 25 % by weight of phthalimido peroxyhexanoic acid (phthalimido percaproic acid, PAP) and between 2 and 5 % by weight of adipic acid or isophthalic acid based on the total weight of the composition.
11.Composition according to any of claims 1 to 10, characterized in that the
composition is in the form of a powder, a flake or a solid block.
12. Use of a composition according to any of claims 1 to 11 as a bleaching agent.
13. Detergent composition comprising the composition according to any of claims 1 to 11.
14. Detergent composition according to claim 13, characterized in that it
comprises less than 10 ppm, preferably less than 5 ppm, even more preferably less than 1 ppm, and most preferably less than 0,1 ppm boric acid.
15. Use of at least one dicarboxylic acid for stabilizing a phthalimido percarboxylic acid in a detergent composition.
PCT/EP2013/060556 2013-05-22 2013-05-22 Stabilization of phthalimido percarboxylic acids with dicarboxylic acids WO2014187485A1 (en)

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* Cited by examiner, † Cited by third party
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EP0526959A2 (en) * 1991-08-06 1993-02-10 W.R. Grace & Co.-Conn. Biodegradable bleach stabilizers for detergents
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