CA2020589A1 - Stabilized sodium percarbonate composition - Google Patents
Stabilized sodium percarbonate compositionInfo
- Publication number
- CA2020589A1 CA2020589A1 CA 2020589 CA2020589A CA2020589A1 CA 2020589 A1 CA2020589 A1 CA 2020589A1 CA 2020589 CA2020589 CA 2020589 CA 2020589 A CA2020589 A CA 2020589A CA 2020589 A1 CA2020589 A1 CA 2020589A1
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- Prior art keywords
- sodium
- acid
- sodium percarbonate
- sulfate
- component
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Abstract A stabilized sodium percarbonate is obtained by incorporating therein (A) at least one compound selected from the group consisting of mono- and dicarboxylic acids having not less than four carbon atoms and salts thereof; and (B) at least one compound selected from the group consisting of sulfates, nitrates and silicates of alkali metals and alkaline earth metals.
Description
2020~
Stabilized Sodium Percarbonate Composition Background of the Invention The present invention relates to a stabilized sodium percarbonate composition, particularly a stabilized sodium percarbonate composition suitable for use as a bleaching agent in detergents, etc.
Sodium percarbonate is generally used widely as a bleaching agent, a detergent, or a sterilizer. Sodium percarbonate as a bleaching agent is superior in solubility at low temperatures, exhibits a high bleaching effect, and is a stable compound in an ordinary perserved state. However, ~odium percarbonate is disadvantageous in that it is unstable when preserved in a high humidity condition or when incorporated in a detergent. As a household detergent, a product containing a predetermined certain amount of sodium percarbonate as a bleaching agent is particularly preferred.
When incorporated in a detergent, however, sodium percarbonate loses its stability upon contact with a zeolite which is used ac a builder or with water contained in a very small amount in the detergent, resulting in that not only the sodium percarbonate no longer exhibits the bleaching effect but also there is fear of the detergent losing its effect. Various proposals have heretofore been made for solving these problems.
For example in Japanese Patent Publication No. 56167/1988 there is disclosed a method wherein sodium percarbonate is coated with magnesium sulfonate or magnesium salt of sulfuric ester;
-` 202058~
in Japanese Patent Publication No. 57362/1988there is disclosed a method wherein sodium percarbonate is coated with such magnesium salt plus sulfate or hydrochloride of an alkali or alkaline earth metal; in Japanese Patent Laid-Open No.
118606/1085 there is disclosed a method wherein sodium percarbonate is coated with boric acid or a partially neutralized borate and a water repellent: in Japanese Patent Laid-Open No. 194000/1984 a method wherein sodium percarbonate is coated with a borate and a magnesium compound; and in Japanese Patent Laid-Open No. 129500/1975 a method wherein sodium percarbonate is coated with a mixture of a surfactant and a water-insoluble compound which is compatible with the surfactant. All of these methods intend to prevent sodium percarbonate rom coming into contract with detergent lngredients to stabilize it by coating it with specific chemical substances. According to these conventional methods, however, when the sodium percarbonate thus coated is preserved in a high humidity condition or when incorporated in a detergent, the stabilization effect is not attained at all to a satisfactory extent in practical use.
- It is the object of the present invention to solve the above-mentioned problem. The present inventors found that the aforesaid problem which had not been solved by the prior art could be overcome by incorporating in sodium percarbonate a mono- or dicarboxylic acid having not less than four carbon atoms or a salt thereof and a sulfate, nitrate or silicate of an alkali metal or alkaline earth metal. In this way we reached the present invention.
-.
.' .
Stabilized Sodium Percarbonate Composition Background of the Invention The present invention relates to a stabilized sodium percarbonate composition, particularly a stabilized sodium percarbonate composition suitable for use as a bleaching agent in detergents, etc.
Sodium percarbonate is generally used widely as a bleaching agent, a detergent, or a sterilizer. Sodium percarbonate as a bleaching agent is superior in solubility at low temperatures, exhibits a high bleaching effect, and is a stable compound in an ordinary perserved state. However, ~odium percarbonate is disadvantageous in that it is unstable when preserved in a high humidity condition or when incorporated in a detergent. As a household detergent, a product containing a predetermined certain amount of sodium percarbonate as a bleaching agent is particularly preferred.
When incorporated in a detergent, however, sodium percarbonate loses its stability upon contact with a zeolite which is used ac a builder or with water contained in a very small amount in the detergent, resulting in that not only the sodium percarbonate no longer exhibits the bleaching effect but also there is fear of the detergent losing its effect. Various proposals have heretofore been made for solving these problems.
For example in Japanese Patent Publication No. 56167/1988 there is disclosed a method wherein sodium percarbonate is coated with magnesium sulfonate or magnesium salt of sulfuric ester;
-` 202058~
in Japanese Patent Publication No. 57362/1988there is disclosed a method wherein sodium percarbonate is coated with such magnesium salt plus sulfate or hydrochloride of an alkali or alkaline earth metal; in Japanese Patent Laid-Open No.
118606/1085 there is disclosed a method wherein sodium percarbonate is coated with boric acid or a partially neutralized borate and a water repellent: in Japanese Patent Laid-Open No. 194000/1984 a method wherein sodium percarbonate is coated with a borate and a magnesium compound; and in Japanese Patent Laid-Open No. 129500/1975 a method wherein sodium percarbonate is coated with a mixture of a surfactant and a water-insoluble compound which is compatible with the surfactant. All of these methods intend to prevent sodium percarbonate rom coming into contract with detergent lngredients to stabilize it by coating it with specific chemical substances. According to these conventional methods, however, when the sodium percarbonate thus coated is preserved in a high humidity condition or when incorporated in a detergent, the stabilization effect is not attained at all to a satisfactory extent in practical use.
- It is the object of the present invention to solve the above-mentioned problem. The present inventors found that the aforesaid problem which had not been solved by the prior art could be overcome by incorporating in sodium percarbonate a mono- or dicarboxylic acid having not less than four carbon atoms or a salt thereof and a sulfate, nitrate or silicate of an alkali metal or alkaline earth metal. In this way we reached the present invention.
-.
.' .
2~ 9 Summary of the Invention The present invention resides in a composition comprising sodium percarbonate and a stabilizer, the stabilizer consisting essentially of:
(a) at least one compound selected from the group consisting of mono- and dicarboxylic acids each having not less than four carbon atoms, and salts thereof; and (bO at least one compound selected from the group consisting of sulfates, nitrates and silicates of alkali metals and alkaline earth metals.
This sodium percarbonate composition, as compared with the conventional sodium percarbonate, is remarkably improved in its stability during preservation in a high humidity condition or when incorporated in a detergent.
Detailed Description of the Invention Examples of mono and dicarboxylic acids each having not less than four carbon atoms which may be used in the present invention include saturated or unsaturated aliphatic, alicyclic or aromatic mono- or dicarboxylic acids having 4 to 20 carbon atoms. More concrete examples are butyric acid, isobutyric acid, valeric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachic acid, behenic acid, lignoceric acid, cyclohexanecarboxylic acid, crotonic acid, 2-methylacrylic acid, sorbic acid, 2,4-pentadienoic acid, zoomaric acid, linolenic acid, linoleic acid, recinoleic acid, gadoleic acid, erucic acid, selacholeic acid, benzoic acid, diphenylacetic acid, toluic acid, p-t-butylbenzoic acid, phenylacetic acid, . . , ~ . , .
:
;' . ' :
.
20205~ -benzoylbenzoic acid, ethylbenzoic acid, 2,3,5-trimethylbenzoic acid, d-naphthoic acid, B-naphthoic acid, 2-methylnaphthoic acid, sebacic acid, undecanoic acid, dodecane-dicarboxylic acid, brassylic acid, detradecane-dicarboxylic acid, thapsinic acid, itaconic acid, muconic acid, naphthenic acid, beef tallow fatty acid, horse fat fatty acid, mutton tallow fatty acid, lard fatty acid, coconut oil fatty acid, palm oil fatty acid, palm kernel oil fatty acid, soybean oil fatty acid, linseed oil fatty acid, castor oil fatty acid, rice bran oil fatty acid, rape oil fatty acid, and hydrogenated such fatty acids.
Examples of salts of mono- and dicarboxylic acids each having not less than four carbon atoms which may be used in the present invention include sodium salts, potassium salts, magnesium salts and calcium salts of the C4 or more mono- or dicarboxylic acids examplified above.
Examples of sulfates, nitrates and silicates of alkali metals and alkaline earth metals which may be used in the present invention include sodium sulfate, potassium sulfate, magnesium sulfate, sodium nitrate, potassium nitrate, magneslum nitrate, calcium nitrate, sodium silicate (Nos. 1, 2 and 3), sodium metasilicate, sodium orthosilicate, and potassium silicate.
In the stabilizer used in the present invention, even if at least one compound selected from the group (A) or at least one compound selected from the group (B) is incorporated each alone in sodium percarbonate, there will not be obtained a satisfactory effect of stabilization. Only when both compounds are used together ther~ is obtained a satis~actory effect.
2020~89 It is preferable that the stabilizer components (A) and (B~ in the present invention be used each in an amount of 0.5 to 20 wt~. If the amount thereof is smaller than O.S wt%, there will not be obtained a satisfactory effect, while if the amount thereof is larger than 20 wt~, the effective oxygen concentration will be decreased more than necessary although a satisfactory effect of stabilization will be obtained. More preferably, the stabilizer components (A) and (B) are used each in an amount o 2 to lO wt~.
For preparing the composition of the present invention there may be adopted any method if only it permits uniform dispersion or incorporation of the stabilizer components (A) and (B) in sodium percarbonate. For example, the composition of the present invention can be prepared by mixing the compounds (A) and (B) with wet crystals obtained in a crystallization step and then granulating the resulting mixture. Or it can be prepared by dissolving the stabilizer components in water or an organic solvent and spraying the resulting solution to flowing crystals or granules of sodium percarbonate followed by drying. A solution containing both compounds (A) and (B) may be sprayed in a single step, or separate solutions prepared using the compounds (A) and (B) respectively may be sprayed in two separate steps. Or one of the compound~ (A) and (B) may be added at the time of granulation, while the other is sprayed as a solution. There also may be used conventional additives for sodium percarbonate such as stabilizers other than the one used in the present invention as well as granulation binders.
., .
2020~89 Examples The present invention will be described below in more detail in terms of working Examples of the invention and Comparative Examples. But it is to be understood that the invention is not limited thereto.
Examples l - 29 Sodium carbonate and hydrogen peroxide were reacted together in an aqueous solution and the resulting crystals were separated by centrifugal filtration. Then, the resulting crystals of sodium percarbonate in a wet condition were mixed with a predetermined amount of each of the stabilizer components (A) shown in Table l in accordance with the correcponding composition ratio set forth also in the same table. The resulting mixture was extrusionwise granulated by means of a granulator equipped with a 1.0 mm mesh wire gauze, followed by drylng. 200 g of the granules thus obtained were fed into a rotary vacuum dryer equipped with a spray coated and a 10-25% aqueous solution of the corresponding stabilizer component (B) shown in Table l was sprayed to the granules little by little while heating was made to 70C under reduced pre~sure in accordance with the corresponding compsition ratio ~et forth in the same table. After termination of the spraying, the composition thus obtained was dried for 20 minute~. In this way there were prepared sodium percarbonate compo~itions in accordance with the composition ratios described in Table l, which compositions were found to range in effective oxygen concentration from 12.5% to 13.5~. Then, the - -2~ 8~
compositions were each mixed 2 g with 2 g of a powdered zeolite for detergent intimately and the resulting mixtures were allowed to stand for 48 hours under the conditions of 50C and a relative humidity of 80~, then determined for residual effective oxygen concentrations, from which the respective stabilities were calculated. The results are as set out in Table 1. The determination of effective oxygen concentration was performed according to an iodometric titration method. For comparison purpose, the same test was conducted also with respect to the use of sodium percarbonate not containing any stabilizer and the use of each stabilizer component alone, and the results obtained are showing as Comparative Examples in Table 1.
, ' 1 , ~ - 1 of 2 , ~ - Table 1 2020~
Ex. Composition Ratio (~) Sodium Stabilizer Stabilizer Stability No. Percarbonate Component (A) Component (B) (~) , : 1 90 caproic Acid 5 magnesium 5 69 2 90 ~ 5 " 5 71 3 90 cyclohexane- " 5 70 carboxylic -~; acid 5 4 90 lauric acid 5 magnesium 5 73 ' ; 5 90 myristic acid 5 sodium 73 - sulfate 5 6 90 palmitic acid 5 n 5 75 7 90 stearic acid 5 potassium 70 sultate 5 - 8 90 behenic acid 5 sodium 69 nitrate 5 9 90 linolenic acid 5 magnesium 72 nitrate 5 " 5 " 5 75 ' 11 90 recinoleic magnesium 5 76 acid 5 sulfate . - 12 90 p-toluic acid 5 " 5 78 13 90 phenylacetic " 5 79 acid 5 14 92 beef tallow " 3 73 fatty acid 5 : , 15 92 horse fat " 3 72 fatty acid 5 ~:' 16 94 mutton tallow sodium 70 fatty acid 5 silicate . ~No.3) 17 93 lard fatty potassium 72 . acid 5 silicate 2 18 90 coconut oil sodium 75 fatty acid 5 sulfate 5 ! 19 90 palm kernel " 5 75 : i oil fatty acid 5 soybean oil " 5 77 fatty acid 5 , ' , ~ ~ , . ~ .' ' ' ":
20~205~89~cdble 1 2 of 2 Sodium Stabilizer Stabilizer gtabllity No. Percarbonate Component (A) Componen~ lB) (%) 21 94 linseed oil sodium 73 fatty acid 5 silicate (No.3) 22 94 rice bran " 1 75 : oil fatty acid 5 23 94 hydrogenated " 1 76 beef tallow fatty acid 5 24 92 hydrogenated magnesium 77 horse fat sulfate 3 fatty acid S
92 naphthenic " 3 72 acid (~125) 5 26 92 sodium " 3 77 oleate 5 27 90 potassium sodium 73 oleate 5 sulfate 5 28 90 magnesium " 5 73 oleate 5 29 90 calcium " 5 74 oleate 5 Comp. Ex.
1 100 . 20 2 95 magnesium 5 25 sulfate 3 99 - sodium 1 33 silicate (No.3) 4 95 beef tallow 5 40 fatty acid sodium 5 39 oleate 6 99.4 beef tallow 0.3 magnesium 0.3 45 fatty acid sulfate 7 99.4 p-toluic acid 0.3 sodium 0.3 43 sulfate 2020~8~9 Examples 30 - 49 200 g of 16 to 80 mesh granules of dried sodium percarbonate obtained by extrusive granulation were fed into a rotary vacuum dryer equipped with a spray coater and a 10-255 aqueous solution of each of the stabilizer components (B) shown in Table 2 was sprayed to the granules little by little while heating was made to 70C under reduced pressure until a predetermined amount thereof was incorporated in the granules.
Then, a 10-30% solution in ethanol of each of the stabilizer components (A) shown in the same table was sprayed in the same manner as above until a predetermined amount thereof was incorporated in the granules. After termination of the spraying, the composition thus obtained was dried for 10 minutes. In this way there were prepared sodium percarbonate compositionq in accordance with the composition ratios de~cribed in Table 2, which compositions were found to range in effective oxygen concentration from 12.0% to 13.5%. Then, the compositions were determined for stability in the same way as ln Examples 1-29. The results are as set forth in Table 2.
,, ~
':~
2~20~3 Table 2 1 of 2 Ex. Composition Ratio (%) Sodium Stabilizer Stabilizer Stability No. Percarbonate Component (A) Component (B) ~ (%) 92 crotonic acid 5 magnesium 72 sulfate 3 31 92 2-methylacrylic ~"
aci~ 5 " 3 73 32 92 sorbic acid 5 " 3 70 33 90 d-naphthoic sodium acid 5 sulfate 5 77 34 90 sebacic acid 5 " 5 70 didecane- " 5 80 dicarboxylic acid 5 36 90 tetradecane- " 5 81 dicarboxylic acid 5 37 90 muconic acid 5 " 5 72 38 90 beef tallow magnesium fatty acid 5 sulfate 5 81 39 90 " 5sodium 76 sulfate 5 -93 " 5sodium 75 silicate (No.2) 2 41 93 " 5sodium 72 sulfate 2 42 92 " 5magnesium 70 nitrate 3 43 91.5 /beef tallow /sodium 80 soda soap 80% silicate mixture coconut oil 5 (No.3) 0.5 ~oda soap 20% ~sodium sulfate 3 2~2~$~
Table 2 2 of 2 Sodium Stabilizer StabilizerStability No. Percarbonate component (A) Component (B) (~) 44 92.5 benzoic acid 1 sodium 83 / silicate naphthenic (No.3) 0.5 acid (#125) 1 sodium beef tallow sulfate 3 ~fatty acid 2 94 benzoic acid 1 magnesium 69 sulfate 5 46 90 " 5 " 5 79 47 85 " 10 " 5 85 .
48 98 " 0.5 sodium 67 sulfate sodium silicate (No-3) 0.5 49 99 beef tallow sodium 0.5 63 fatty acid 0.5 silicate (No.3) , - ' : :
'' ' :
,: :
~ ~ .
(a) at least one compound selected from the group consisting of mono- and dicarboxylic acids each having not less than four carbon atoms, and salts thereof; and (bO at least one compound selected from the group consisting of sulfates, nitrates and silicates of alkali metals and alkaline earth metals.
This sodium percarbonate composition, as compared with the conventional sodium percarbonate, is remarkably improved in its stability during preservation in a high humidity condition or when incorporated in a detergent.
Detailed Description of the Invention Examples of mono and dicarboxylic acids each having not less than four carbon atoms which may be used in the present invention include saturated or unsaturated aliphatic, alicyclic or aromatic mono- or dicarboxylic acids having 4 to 20 carbon atoms. More concrete examples are butyric acid, isobutyric acid, valeric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachic acid, behenic acid, lignoceric acid, cyclohexanecarboxylic acid, crotonic acid, 2-methylacrylic acid, sorbic acid, 2,4-pentadienoic acid, zoomaric acid, linolenic acid, linoleic acid, recinoleic acid, gadoleic acid, erucic acid, selacholeic acid, benzoic acid, diphenylacetic acid, toluic acid, p-t-butylbenzoic acid, phenylacetic acid, . . , ~ . , .
:
;' . ' :
.
20205~ -benzoylbenzoic acid, ethylbenzoic acid, 2,3,5-trimethylbenzoic acid, d-naphthoic acid, B-naphthoic acid, 2-methylnaphthoic acid, sebacic acid, undecanoic acid, dodecane-dicarboxylic acid, brassylic acid, detradecane-dicarboxylic acid, thapsinic acid, itaconic acid, muconic acid, naphthenic acid, beef tallow fatty acid, horse fat fatty acid, mutton tallow fatty acid, lard fatty acid, coconut oil fatty acid, palm oil fatty acid, palm kernel oil fatty acid, soybean oil fatty acid, linseed oil fatty acid, castor oil fatty acid, rice bran oil fatty acid, rape oil fatty acid, and hydrogenated such fatty acids.
Examples of salts of mono- and dicarboxylic acids each having not less than four carbon atoms which may be used in the present invention include sodium salts, potassium salts, magnesium salts and calcium salts of the C4 or more mono- or dicarboxylic acids examplified above.
Examples of sulfates, nitrates and silicates of alkali metals and alkaline earth metals which may be used in the present invention include sodium sulfate, potassium sulfate, magnesium sulfate, sodium nitrate, potassium nitrate, magneslum nitrate, calcium nitrate, sodium silicate (Nos. 1, 2 and 3), sodium metasilicate, sodium orthosilicate, and potassium silicate.
In the stabilizer used in the present invention, even if at least one compound selected from the group (A) or at least one compound selected from the group (B) is incorporated each alone in sodium percarbonate, there will not be obtained a satisfactory effect of stabilization. Only when both compounds are used together ther~ is obtained a satis~actory effect.
2020~89 It is preferable that the stabilizer components (A) and (B~ in the present invention be used each in an amount of 0.5 to 20 wt~. If the amount thereof is smaller than O.S wt%, there will not be obtained a satisfactory effect, while if the amount thereof is larger than 20 wt~, the effective oxygen concentration will be decreased more than necessary although a satisfactory effect of stabilization will be obtained. More preferably, the stabilizer components (A) and (B) are used each in an amount o 2 to lO wt~.
For preparing the composition of the present invention there may be adopted any method if only it permits uniform dispersion or incorporation of the stabilizer components (A) and (B) in sodium percarbonate. For example, the composition of the present invention can be prepared by mixing the compounds (A) and (B) with wet crystals obtained in a crystallization step and then granulating the resulting mixture. Or it can be prepared by dissolving the stabilizer components in water or an organic solvent and spraying the resulting solution to flowing crystals or granules of sodium percarbonate followed by drying. A solution containing both compounds (A) and (B) may be sprayed in a single step, or separate solutions prepared using the compounds (A) and (B) respectively may be sprayed in two separate steps. Or one of the compound~ (A) and (B) may be added at the time of granulation, while the other is sprayed as a solution. There also may be used conventional additives for sodium percarbonate such as stabilizers other than the one used in the present invention as well as granulation binders.
., .
2020~89 Examples The present invention will be described below in more detail in terms of working Examples of the invention and Comparative Examples. But it is to be understood that the invention is not limited thereto.
Examples l - 29 Sodium carbonate and hydrogen peroxide were reacted together in an aqueous solution and the resulting crystals were separated by centrifugal filtration. Then, the resulting crystals of sodium percarbonate in a wet condition were mixed with a predetermined amount of each of the stabilizer components (A) shown in Table l in accordance with the correcponding composition ratio set forth also in the same table. The resulting mixture was extrusionwise granulated by means of a granulator equipped with a 1.0 mm mesh wire gauze, followed by drylng. 200 g of the granules thus obtained were fed into a rotary vacuum dryer equipped with a spray coated and a 10-25% aqueous solution of the corresponding stabilizer component (B) shown in Table l was sprayed to the granules little by little while heating was made to 70C under reduced pre~sure in accordance with the corresponding compsition ratio ~et forth in the same table. After termination of the spraying, the composition thus obtained was dried for 20 minute~. In this way there were prepared sodium percarbonate compo~itions in accordance with the composition ratios described in Table l, which compositions were found to range in effective oxygen concentration from 12.5% to 13.5~. Then, the - -2~ 8~
compositions were each mixed 2 g with 2 g of a powdered zeolite for detergent intimately and the resulting mixtures were allowed to stand for 48 hours under the conditions of 50C and a relative humidity of 80~, then determined for residual effective oxygen concentrations, from which the respective stabilities were calculated. The results are as set out in Table 1. The determination of effective oxygen concentration was performed according to an iodometric titration method. For comparison purpose, the same test was conducted also with respect to the use of sodium percarbonate not containing any stabilizer and the use of each stabilizer component alone, and the results obtained are showing as Comparative Examples in Table 1.
, ' 1 , ~ - 1 of 2 , ~ - Table 1 2020~
Ex. Composition Ratio (~) Sodium Stabilizer Stabilizer Stability No. Percarbonate Component (A) Component (B) (~) , : 1 90 caproic Acid 5 magnesium 5 69 2 90 ~ 5 " 5 71 3 90 cyclohexane- " 5 70 carboxylic -~; acid 5 4 90 lauric acid 5 magnesium 5 73 ' ; 5 90 myristic acid 5 sodium 73 - sulfate 5 6 90 palmitic acid 5 n 5 75 7 90 stearic acid 5 potassium 70 sultate 5 - 8 90 behenic acid 5 sodium 69 nitrate 5 9 90 linolenic acid 5 magnesium 72 nitrate 5 " 5 " 5 75 ' 11 90 recinoleic magnesium 5 76 acid 5 sulfate . - 12 90 p-toluic acid 5 " 5 78 13 90 phenylacetic " 5 79 acid 5 14 92 beef tallow " 3 73 fatty acid 5 : , 15 92 horse fat " 3 72 fatty acid 5 ~:' 16 94 mutton tallow sodium 70 fatty acid 5 silicate . ~No.3) 17 93 lard fatty potassium 72 . acid 5 silicate 2 18 90 coconut oil sodium 75 fatty acid 5 sulfate 5 ! 19 90 palm kernel " 5 75 : i oil fatty acid 5 soybean oil " 5 77 fatty acid 5 , ' , ~ ~ , . ~ .' ' ' ":
20~205~89~cdble 1 2 of 2 Sodium Stabilizer Stabilizer gtabllity No. Percarbonate Component (A) Componen~ lB) (%) 21 94 linseed oil sodium 73 fatty acid 5 silicate (No.3) 22 94 rice bran " 1 75 : oil fatty acid 5 23 94 hydrogenated " 1 76 beef tallow fatty acid 5 24 92 hydrogenated magnesium 77 horse fat sulfate 3 fatty acid S
92 naphthenic " 3 72 acid (~125) 5 26 92 sodium " 3 77 oleate 5 27 90 potassium sodium 73 oleate 5 sulfate 5 28 90 magnesium " 5 73 oleate 5 29 90 calcium " 5 74 oleate 5 Comp. Ex.
1 100 . 20 2 95 magnesium 5 25 sulfate 3 99 - sodium 1 33 silicate (No.3) 4 95 beef tallow 5 40 fatty acid sodium 5 39 oleate 6 99.4 beef tallow 0.3 magnesium 0.3 45 fatty acid sulfate 7 99.4 p-toluic acid 0.3 sodium 0.3 43 sulfate 2020~8~9 Examples 30 - 49 200 g of 16 to 80 mesh granules of dried sodium percarbonate obtained by extrusive granulation were fed into a rotary vacuum dryer equipped with a spray coater and a 10-255 aqueous solution of each of the stabilizer components (B) shown in Table 2 was sprayed to the granules little by little while heating was made to 70C under reduced pressure until a predetermined amount thereof was incorporated in the granules.
Then, a 10-30% solution in ethanol of each of the stabilizer components (A) shown in the same table was sprayed in the same manner as above until a predetermined amount thereof was incorporated in the granules. After termination of the spraying, the composition thus obtained was dried for 10 minutes. In this way there were prepared sodium percarbonate compositionq in accordance with the composition ratios de~cribed in Table 2, which compositions were found to range in effective oxygen concentration from 12.0% to 13.5%. Then, the compositions were determined for stability in the same way as ln Examples 1-29. The results are as set forth in Table 2.
,, ~
':~
2~20~3 Table 2 1 of 2 Ex. Composition Ratio (%) Sodium Stabilizer Stabilizer Stability No. Percarbonate Component (A) Component (B) ~ (%) 92 crotonic acid 5 magnesium 72 sulfate 3 31 92 2-methylacrylic ~"
aci~ 5 " 3 73 32 92 sorbic acid 5 " 3 70 33 90 d-naphthoic sodium acid 5 sulfate 5 77 34 90 sebacic acid 5 " 5 70 didecane- " 5 80 dicarboxylic acid 5 36 90 tetradecane- " 5 81 dicarboxylic acid 5 37 90 muconic acid 5 " 5 72 38 90 beef tallow magnesium fatty acid 5 sulfate 5 81 39 90 " 5sodium 76 sulfate 5 -93 " 5sodium 75 silicate (No.2) 2 41 93 " 5sodium 72 sulfate 2 42 92 " 5magnesium 70 nitrate 3 43 91.5 /beef tallow /sodium 80 soda soap 80% silicate mixture coconut oil 5 (No.3) 0.5 ~oda soap 20% ~sodium sulfate 3 2~2~$~
Table 2 2 of 2 Sodium Stabilizer StabilizerStability No. Percarbonate component (A) Component (B) (~) 44 92.5 benzoic acid 1 sodium 83 / silicate naphthenic (No.3) 0.5 acid (#125) 1 sodium beef tallow sulfate 3 ~fatty acid 2 94 benzoic acid 1 magnesium 69 sulfate 5 46 90 " 5 " 5 79 47 85 " 10 " 5 85 .
48 98 " 0.5 sodium 67 sulfate sodium silicate (No-3) 0.5 49 99 beef tallow sodium 0.5 63 fatty acid 0.5 silicate (No.3) , - ' : :
'' ' :
,: :
~ ~ .
Claims
(1) A stable sodium percarbonate composition comprising sodium percarbonate and the following components (A) and (B) incorporated therein:
(A) at least one compound selected from the group consisting of mono- and dicarboxylic acids having not less than four carbon atoms and salts thereof; and (B) at least one compound selected from the group consisting of sulfates, nitrates and silicates of alkali metals and alkaline earth metals.
(2) A stable sodium percarbonate as set forth in Claim 1, wherein the content of the component (A) and that of the component (b) are each in the range of 0.5 to 20 % by weight.
(3) A stable sodium percarbonate as set forth in Claim 1, wherein the component (A) is a saturated or unsaturated, aliphatic, alicyclic or aromatic mono- or dicarboxylic acid having 4 to 20 carbon atoms.
(4) A stable sodium percarbonate as set forth in Claim 1, wherein the salts in the component (A) are sodium salt, potassium salt, magnesium salt and calcium salt.
(5) A stable sodium percarbonate as set forth in
Claim 1, wherein the component (B) is sodium sulfate, potassium sulfate, magnesium sulfate, sodium nitrate, potassium nitrate, magnesium nitrate, calcium nitrate, sodium silicate, sodium metasilicate, sodium orthosilicate, or potassium silicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2020589 CA2020589A1 (en) | 1989-07-06 | 1990-07-06 | Stabilized sodium percarbonate composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP173063/1989 | 1989-07-06 | ||
| CA 2020589 CA2020589A1 (en) | 1989-07-06 | 1990-07-06 | Stabilized sodium percarbonate composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2020589A1 true CA2020589A1 (en) | 1991-01-07 |
Family
ID=4145418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2020589 Abandoned CA2020589A1 (en) | 1989-07-06 | 1990-07-06 | Stabilized sodium percarbonate composition |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2020589A1 (en) |
-
1990
- 1990-07-06 CA CA 2020589 patent/CA2020589A1/en not_active Abandoned
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