MXPA97006868A - White product - Google Patents

Abstract

The present invention relates to a bleaching product comprising an aqueous solution at a pH of 8 or more, which contains: A) from 0.5 to 60 weight percent of a compound selected from the group consisting of hydrogen peroxide and compounds of peroxide that generate hydrogen peroxide in aqueous solution, B) cyanourea and C) an alkaline agent

Description

WHITENING PRODUCT Technical Field This invention relates to a peroxide bleaching product with excellent bleaching activity. The bleaching product of this invention is characterized by its cyanourea content as the bleach activating agent and is used to whiten fabrics. The bleaching product of this invention is preferably used to whiten mold developed on the walls of a house or furniture.

Previous Technique Bleaches and mildew removers are classified into chlorine bleach and peroxide bleach. Chlorine bleaches with the main component of sodium hypochlorite have been used to whiten fabrics and the mold developed on the walls of a house or a piece of furniture due to its strong whitening activity. However, despite the excellent bleaching effectiveness, chlorine bleach products are full of disadvantages such as discoloration of the fabric, making its use inappropriate for fabrics with color, unpleasant characteristic odor due to the chlorine molecule during its use and the Possible poisoning damage due to chlorine gas.

On the other hand, peroxide bleaches have been used more frequently in general household maintenance because of the broad applicability as a bleach compared to the type of chlorine and the absence of bad odor. However, the bleaching effectiveness of peroxide whiteners is lower, if used alone, compared to chlorine bleach, resulting in poor bleaching performance when used for fabrics at low temperatures and when used to whiten the mold on the surface of domestic walls or furniture, especially the mold that develops in the laundry room of the kitchen and on the walls, bathroom ceilings and tile joints. Accordingly, attempts have been made to increase the bleaching activity by the addition of N-acyl compounds such as tetraacetylethylenediamine (TAED) or tetraacetyl glycoluril (sic) (TAGU) or esters such as glucose pentacetate or sucrose octaacetate for compounds of peroxide such as hydrogen peroxide, adduct of hydrogen peroxide of sodium carbonate or sodium perborate. Various proposals have been made for using nitrile compounds as the activating agent for improved bleaching activity of the peroxide compounds. U.S. Patent Application No. 802,035 described the use of various nitrile compounds and U.S. Patent Application No. 3,882,035 described the use of a bleach product containing iminodiacetonitrile as the activating agent. The Japanese Patent Application Kokai No.

Sho 52 [1977] -52880 describes nitriles such as p-chlorobenzoylcyanamide. However, insufficient whitening activity was obtained for fabrics at low temperatures and for the removal of domestic mold by bleaching. There is another disadvantage in such a bleach in that bad odor, specifically peracetic acid, was generated as a result of the reaction of hydrogen peroxide in the use of activators such as N-acyl compounds, for example, TAED, and esters, for example, glucose pentacetate.

Description of the Invention This invention offers a bleaching product with excellent bleaching activity on fabric as well as excellent activity for the removal of mold on domestic walls and furniture by bleaching without bad odor. After intensive studies to solve the aforementioned problems, it was discovered that a major improvement can be made in fabric bleaching and mold removal on furniture and domestic walls by bleaching without generating a bad smell by the use of a bleaching product. compound of hydrogen peroxide or a peroxide that gives origin to hydrogen peroxide in aqueous solution, cyanourea and alkaline agent, under the condition that the alkalinity is reached when the product dissolves in water. The invention is the result of this discovery.

The invention offers a bleaching product characterized by its content of hydrogen peroxide or peroxide compounds that generate hydrogen peroxide in aqueous solution, (B) cyanourea and (C) an alkaline agent under the condition that it reaches pH 8 or higher in the aqueous solution of the product. As (A) hydrogen peroxide or a peroxide that generates hydrogen peroxide in aqueous solution, an aqueous solution of hydrogen peroxide or hydrogen peroxide with added sodium carbonate can be used with a molar ratio between sodium carbonate and hydrogen peroxide. 2: 3 hydrogen or sodium perborate mono- or tetrahydrate. As (B) cyanourea, the solid form or an alkaline aqueous solution of this compound can be used. As (C) an alkaline agent, alkali metal hydroxides or alkali metal silicate salts can be used. Among them, it is preferable to use alkali metal silicate salts such as sodium and potassium silicate, since the bleaching activity is markedly improved by those compounds. The bleaching product of this invention can be used by spraying the product components, (A) hydrogen peroxide or a peroxide that generates hydrogen peroxide in aqueous solution, (B) cyanourea and (C) an alkaline agent on the material that is going to bleach. Or the product can be used with the cleaner during washing. An aqueous solution prepared in advance can also be used by dissolving (A) hydrogen peroxide or a peroxide which generates hydrogen peroxide in aqueous solution, (B) cyanourea and (C) an alkaline agent in water. In the use of the bleaching product of this invention, it is preferable to use the aqueous solution of the product previously prepared to carry out the bleaching process in a gentle manner. In such a case the content of hydrogen peroxide is 0.5-60% by weight or preferably 0.5-30% by weight or more preferably 0.5-10% by weight and practically 1-6% by weight. If the content is less than this scale, the bleaching activity is too low and, if the content is greater than this scale, handling becomes difficult. The content of (B) cyanourea is 0.2-30% by weight, or preferably 0.5. -10% by weight, or more preferably 0.5-5% by weight. The content of (C) an alkaline agent is 0.1-20% so that the pH of the aqueous solution is 8 or greater or, preferably on the scale of 9-13. It is necessary to use the alkaline agent to achieve a high bleaching activity in the bleaching product of this invention, the bleaching product of this invention may be in the form of a homogeneous solution and a paste, in order to carry out the bleaching activity. When the bleaching product of this invention is used for mold removal, such an aqueous solution prepared above is convenient for easy application. It is possible to improve the bleaching and cleaning effect by adding a surfactant to the bleaching product of this invention. As such a surfactant, there may be mentioned polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters and amine oxides as nonionic surfactants, soap, alkyl sulfate salts and alkylbenzenesulfonate salts as anionic surfactants. It is preferable to add the surfactant to 0.1-5% by weight of the bleaching product.

Description of the Preferred Modalities The invention is explained with application examples, although the invention is not limited by those examples.

Application Example 1 A bleaching product was prepared by dissolving 3% by weight hydrogen peroxide, 3% by weight cyanourea and 5% sodium metasilicate in water at pH 10.9. With the bleaching product thus obtained, the following tests were carried out as described below: the bleaching test of the fabric stained with black thé, the mildew bleaching test and the odor evaluation. The results are shown in Table I. Method of testing and evaluation for the bleaching test of the cloth stained with black cloth 1) Preparation of cloth stained with black tea 10 g of black thea sheets wrapped in gauze were boiled for 5 minutes in 1000 ml of water placed in a laboratory glass followed by the removal of the tea leaves for the preparation of the black tea. 50 g of prewashed cotton fabric (# 100) soaked in the tea, which was boiled continuously for 30 minutes. The cloth was squeezed by hand after cooling and dried without exposure to sunlight. 2) Test method for bleaching cloth stained with black thé The cloth stained with thé (5 x 5 cm) was placed in a crystallization dish (external circumference 12 cm, height 6 cm) and 20 g of the bleaching product were added and They left for 30 minutes. The cloth was removed to be washed with tap water and dried without exposure to sunlight. 3) Evaluation method The reflectance of the fabric was measured before staining with black thé, after staining with black thé and after bleaching using a colorimeter (differential colorimeter and the bleaching scale was calculated using the following equation: Bleaching scale (%) = (Rw-Rs) x 100 R0: reflectance of the fabric before staining with black threads Rw: reflectance of the cloth after blanching Rs: reflectance of the cloth after staining with black thé. Mold bleaching 1) Mold culture method Agar agar culture medium was poured into sterile petri dishes to be seeded with black mold (Aureobasidium pullulans) and the dish was incubated in an incubator at 35 ° C during 10 days. 2) Test Method of mildew bleach was placed a glass tube on the agar plate in which the mold grew and the test solution was placed in the glass tube. 30 minutes later, the degree of mildew bleaching was measured. 3) Evaluation method The degree of bleaching was classified in 3 stages, described below by macroscopic observation. Degree of bleaching: completely bleached Degree of bleaching: bleached to a certain degree Degree of bleaching, almost or completely unbleached Test method and odor evaluation 1) Odor test method 10 members of a panel were asked to aspirate the bleaching product for the sensitive evaluation. 2) Odor evaluation The odor was classified as follows: o: No irritant smell or bad odor was detected by almost all panel members. A: Half of the panel members detected an irritating odor or bad odor. x: Almost all members of the panel detected an irritating odor or bad smell.

Application Examples 2-7 Bleaching products were prepared with altered and contained components as shown in Table I, where the term% Indica% wt. The pH of the solution is shown in Table I. Similar to the previous one, the bleaching test was carried out on the cloth stained with black thé, the bleaching test on mold and the odor evaluation with the results listed in Table I.

Examples of Aplication 8-9 Bleaching products were prepared using hydrogen peroxide with added sodium carbonate and sodium perborate instead of hydrogen peroxide. The content of hydrogen peroxide with added sodium carbonate or sodium perborate monohydrate was expressed in terms of the hydrogen peroxide contained in those substances. Table I shows the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor, using those products.

Application Example 10 A bleaching product similar to the Example of Application 1 except for the added alkylamine oxide (trademark Aromox Lion Akuzo (transliteration) K.K.) as the surfactant. The pH of the product is shown in Table II, in which the% term indicates% by weight. The bleaching test was carried out on the cloth stained with black thé, the bleaching test on mold and the evaluation of odor similar to the previous ones using the product and the results are shown in Table II.

Comparative Example 1 A bleaching product was prepared using sodium hypochlorite as shown in Table III. The term% indicates% by weight. Table III shows the pH of the product and the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor carried out with this product. The whitening activity was excellent, although the bad odor of the chlorine was markedly detected.

Comparative Example 2 A bleaching product similar to that of Application Example 1 was prepared, except for the use of cyanourea. Table III shows the pH of the product and the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor with this product. The whitening activity decreased. Comparative Example 3 A bleaching product having a sodium metasilicate content of 2.5% was prepared and using tetracetylethylenediamine instead of cyanourea. Table III shows the pH of the product and the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor with this bleaching product. The whitening activity decreased slightly with a strong odor of peracetic acid.

Comparative Example 4 A bleaching product similar to that of Application Example 1 was prepared, except for the addition of an alkaline agent. The pH of the product was 2.3 and the bleaching activity was reduced.

Comparative Example 5 A bleaching product similar to that of Application Example 1 was prepared, except that iminodiacetonitrile is used in place of cyanourea. Table III shows the pH of the product and the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor. The whitening activity was reduced.

Comparative Example 6 A bleaching product was prepared with hydrogen peroxide with added sodium carbonate. Table III shows the pH of the product and the results of the bleaching test on the cloth stained with black, the bleaching test on mold and the evaluation of odor using this bleaching product. The whitening activity was reduced.

Application Example 11 A wash test on cloth stained with black thé was carried out using the mixture of a commercial brand detergent (trademark Hi-top, Lion K.K.) and hydrogen peroxide with added sodium carbonate, cyanourea and sodium metasilicate with the prescribed contents. Table IV shows the content of each component and the results. Washing test and evaluation methods 1) Preparation of the fabric stained with black thé A similar method was used as in the bleaching test for the cloth stained with black thé. 2) Standard wash 0.75 g of detergent and the prescribed amounts of bleach and / or bleaching product were dissolved in 900 ml of tap water at 25 ° C and 10 pieces of cloth stained with black (5 x 5 cm) and 30 pieces of cotton fabric for underwear (5 x 5 cm) were placed in the solution for washing in a targotometer (transliteration) (product of Daieí Kagaku Seiki Seisakusho) for 10 minutes followed by rinsing, water removal and drying. 3) Washing after soaking 0.75 g of detergent and the prescribed amounts of bleaching product were dissolved in 150 ml of tap water at 25 ° C. 10 pieces of cloth stained with black thé (5 x 5 cm) were soaked in the solution for 1 hour at 25 ° C. After 30 pieces of cotton for underwear (5 x 5 cm) and 750 ml of tap water at 25 ° C were added for washing in a. targotometer for 10 minutes followed by rinsing, water removal and drying. 4) Evaluation method The bleaching scale was calculated in a similar way to the bleaching test for the cloth stained with black thé and the average was obtained for 10 pieces of cloth stained with black thé as the bleaching scale.ahs.

Comparative Example 7 A washing test was carried out with detergent and hydrogen peroxide with added sodium carbonate as the bleach. The amounts added and the results are shown in Table IV. The bleaching scale was reduced in the standard wash test and the wash test after soaking.

Comparative Example 8 A washing test with hydrogen peroxide with added calcium carbonate as a bleach and tetracetylethylene diamine was carried out as the bleach activator. The amounts added and the results are shown in Table IV. The bleaching scale was somewhat reduced in the wash test after soaking and the bleaching of the cloth stained with black thé resulted in a stained condition.

Comparative Example 9 A wash test was carried out with hydrogen peroxide with added sodium carbonate as the bleach and iminodiacetyl nitrile as the bleach activator. The amounts added and the results are shown in Table IV. The bleaching scale was reduced in the standard wash test and the wash test after soaking.

Table I Example 3 4 Application Peroxide 3% 3% 3% 3% 3% 1% 18% Hydrogen Cyan3% 3% 3% 5% 1% 3% 3% urea Metasili5% 5% 5% 5% 5% cato sodium Orthosili- 5% sodium cato Hydroxy 5% sodium Water Rem * Rem * Rem * Rem * Rem * Rem * Rem * Rem * pH 10.9 11 3 13.0 11.1 11.4 11 5 9.6 Test III III III III III III of mildew bleaching Scale 94% 95% 92% 96% 90% 86% 96% Bleaching ** Evalua0 0 0 0 0 0 0 Remaining smell odor **: of cloth stained with thé black TABLE II Example of 10 Application SPC hydrogen peroxide *** pp * ** * Cyanourea Sodium metasilicate AAO ***** Water Mildew bleaching test Bleaching scale ** Odor evaluation **: stained cloth with thea black *** hydrogen peroxide with added sodium carbonate (concentration expressed as the concentration of hydrogen peroxide) ****: sodium perborate mohydrate (concentration expressed as the concentration of hydrogen peroxide) surfactant, alkylamine oxide TABLE III Example 1 2 3 4 5 6 Comparati -vo Peroxide 3% 3% 3% 3% hydrogen SPC *** 3% Hypoclop- 3 5% to Sodium Cianourea 3% TAED ***** 3% * Iminodia- 3% cetonitplo Metasilica 5% 2 5% 5% 1-to sodium Water Rem * Rem * Rem * Rem * Rem * Rem * PH 13 1 11 5 10 8 2 3 10 9 96 Test of III I II I II I bleaching for mold 93% scale 81% 82% 18% 85% 65% bleaching * * EvaluaX OAO 0 Odor odor * remaining ** of cloth stained with black thé *** peroxide hydrogen with added sodium carbonate (concentration expressed as concentration of hydrogen peroxide) ****** tetracetylethylenediamine TABLE IV Ej Api 11 Ej Comp 7 Ej Comp 8 Ej Comp 9 Detergent 075 g 075 g 075 g 075 g SPC *** 0 075 g 0 075 g 0 075 g 0 075 g Cianourea 0038 g TAED ****** 0 038 g IDAN ******* 0038 G 0 075 g sodium metasilicate Bleaching scale Washing 10% 4% 10% 6% standard Soaking / Washing 34% 16% 29% 24% *** hydrogen peroxide with added sodium carbonate (concentration expressed as concentration of hydrogen peroxide) ****** tetracetylethylenediamine ******* iminodiacetonitplo This invention offers the bleaching product with excellent bleaching and washing activities without irritating smell. The bleaching product of this invention can be used effectively for mold removal.

Claims (2)

1. Bleaching product composed of the combination of (A) hydrogen peroxide or peroxide compounds that generate hydrogen peroxide in aqueous solution, (B) cyanourea and (C) alkaline agent.

2. Bleaching product with the following characteristics: the content of hydrogen peroxide or peroxide to generate hydrogen peroxide in aqueous solution as hydrogen peroxide (A) is 0.5-60% by weight, the content of cyanourea (B) is 0.2- 30% by weight, the content of alkaline agent (C) is 0.1-20% by weight and the pH in the aqueous solution of 8 or more.