JPS62252500A - Bleaching composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a neutral to weakly alkaline bleach composition containing a hydrogen peroxide adduct and an activator.

[Conventional technology and its problems]

Chlorine bleach has restrictions on the types of fibers it can be used on, cannot be used on colored or patterned fabrics, and has a unique odor, so oxygen bleach, which does not have these drawbacks, has become extremely popular recently. I'm starting.

Oxygen bleaches include hydrogen peroxide adducts such as sodium percarbonate, sodium perborate, sodium peroxide pyrophosphate, sodium peroxide tripolyphosphate, and urea peroxide. Sodium borate is particularly used because of its bleaching performance and stability.

Generally, the bleach composition contains 50 to 90% hydrogen peroxide adduct, and in order to strengthen the bleaching blade during use, an activator, an alkaline agent, etc. are used in combination, and the composition contains p)
l is adjusted to a high alkaline region of 10 or more.

However, even with bleach compositions containing sodium percarbonate and sodium perborate, the color dyed with metal-containing dyes,
When bleaching stains on patterned fabrics or colored or patterned fabrics that have been treated with a metal-containing fixing agent, there is a drawback that these colors or patterns may change color or fade. In order to prevent this, methods of adding alanine, lysine, adenine, acetylaminoacetic acid, phenylalanine, arginine, etc. have been tried in the past, but their effectiveness has been poor, and the above-mentioned colors and patterns have been repeatedly used, especially in homes. Not sufficient if bleached.

Furthermore, when using a hydrogen peroxide adduct and an activator together as a household bleach, it is preferable to create a composition that contains both from the beginning rather than adding them separately. It is difficult to store the mixed system because a small amount of moisture is generated not only in an aqueous solution but also in powder form, and this moisture further accelerates the decomposition of the hydrogen peroxide adduct.

In order to solve this storage instability, conventional measures have been taken to minimize contact between the activator and the hydrogen peroxide adduct by coating either or both of them with a film-forming material. Attempts have been made to increase the particle size of the particles or both, but these efforts have remained unsatisfactory.

[Means for solving problems]

As a result of extensive studies, the present inventors have discovered that a urea/hydrogen peroxide adduct obtained by reacting urea and hydrogen peroxide in the coexistence of gypsum is used in combination with a specific activator, and the pH of the composition is adjusted. The inventors have discovered that a neutral to slightly alkaline bleach composition can solve all of the above-mentioned problems, and have completed the present invention.

That is, the present invention provides a urea/hydrogen peroxide adduct obtained by reacting (^) urea and hydrogen peroxide in the presence of gypsum, and (B
) activator, (A) / (B) in a weight ratio of 9575
Provided is a bleaching agent composition which contains a bleaching agent in a ratio of ~20/80 and is characterized by being neutral to weakly alkaline.

The urea/hydrogen peroxide adduct (hereinafter referred to as PU-C) obtained by reacting urea and hydrogen peroxide in the coexistence of gypsum to be used in the present invention is produced by, for example, the method described in JP-A-58-167557. You can use what you get. pu-
The amount of c added is usually 50 to 98% by weight in the composition.

Suitable activators for use in the present invention include glucose pentaacetate, glucose tetraacetate, 8-acetylated sucrose, triacetylene, sorbitol hexaacetate, acetoxybenzene sulfonate, or triacetyl cyanuric acid. - Acylated products, N-acylated products such as tetraacetylethylenediamine or tetraacetylglycoluril, and acid anhydrides such as phthalic anhydride and succinic anhydride, which react with hydrogen peroxide in an aqueous solution to form organic peracids. Examples include those that generate. Among others, glucose pentaacetate,
Glucose tetraacetate, 8-acetylated sucrose, triacetin, acetoxybenzenesulfonate, triacetyl cyanuric acid, tetraacetyl ethylene diamine, tetraacetyl glycoluril, sorbitol hexaacetate are preferred, particularly glucose pentaacetate, tetraacetyl glycoluril, tetra Acetyl ethylene diamine is preferred.

The blending ratio of PU-G and activator is 9515-20/80,
Preferably it is 80/20 to 30/70.

The pH of the bleach composition of the present invention is neutral to weakly alkaline (6
, 0 to less than 10).

In this way, PU-G can be stably blended with an activator in powder form, and a bleaching composition that has excellent bleaching properties during use and can be safely used on colored and patterned items can be obtained.

In addition to the above-mentioned essential components, the bleach composition of the present invention may also contain known components that are usually added to bleach compositions.
For example, as builders, sulfates, carbonates, bicarbonates,
In addition to water-soluble inorganic builders such as silicates and phosphates, organic builders such as ethylenediaminetetraacetate, tartrates, and citrates can be used. Also known as stabilizers for peroxides or hydrogen peroxide adducts are magnesium salts such as magnesium sulfate, magnesium silicate, magnesium chloride, magnesium fluorosilicate, magnesium oxide, and magnesium hydroxide, and silicate acids such as sodium silicate. Salts can be used. Furthermore, if necessary, recontamination preventive agents such as carboxymethylcellulose, polyvinylpyrrolidone, and polyethylene glycol, and other ingredients such as various surfactants, enzymes, optical brighteners, dyes, pigments, and fragrances may be added. Can be done.

〔Effect of the invention〕

The bleach composition of the present invention has a stronger bleaching blade than conventional bleach compositions, and furthermore, the bleach composition of the present invention has a stronger bleaching blade than conventional bleach compositions, and can also be used for colored and patterned items dyed with metal complex dyes or pigments, as well as colored and patterned items that have been treated with metal salts or metal-containing fixing agents. In addition to being able to safely bleach and sterilize, it can also be used in a wide range of applications as a general disinfectant and as an oxidizing agent. Furthermore, the bleach composition of the present invention is stable for long periods of storage even when simply mixed.

〔Example〕

Next, the present invention will be described with reference to Examples, but the present invention is not limited to these Examples.

Inventive products 1 to 6 and comparative products A to D having the compositions shown in Table 1 were prepared, and the following tests were conducted. The results are shown in Table 1.

(1) pH measurement Bleach was heated at 20℃ so that the effective oxygen concentration was 0.05%.
Added to tap water and stirred for 1 minute, then measured using a Pi meter manufactured by Horiba.

(2) Bleaching rate: Dissolve a commercially available detergent in tap water at 20°C to a concentration of 0.8%, add bleach to an effective oxygen concentration of 0.05%, and then add commercially available contaminated cloth (E ?tPA 11hl14
) was soaked for 30 minutes, and the bleaching rate was calculated using the following formula.

(3) Disinfecting power Dissolve 0.8% commercially available detergent in sterile water at 20°C, add bleach to make the effective oxygen concentration 0.05%, and after dissolving Staphylococcus aureus in 42 x 10' K/10-addition,
After 30 minutes, the liquid is taken out and added to a medium (normal broth), and after culturing for 2 days, the growth of bacteria is observed. Those that occurred were rated x, and those that did not were rated O.

(4) Dissolve the decolorizing bleach in tap water at 40°C to an effective oxygen concentration of 0.05%, then dissolve the direct dye (Su+silightSu
After soaking the cotton cloth dyed with pra Blue FBGL for 2 hours, its grade was determined using JiS LO804 gray scale for discoloration and fading.
A score of ≧4 to less than 4 was evaluated as Δ, and a score of less than 3 was evaluated as ×.

(5) Storage stability evaluation method: Store the sample in a constant temperature room at 40°C/80% RH for 30 days.
The effective oxygen content of the bleach before and after storage was measured, and the effective oxygen residual rate was calculated using the following formula.

Claims (1)

[Claims] 1. (A) a urea/hydrogen peroxide adduct obtained by reacting urea and hydrogen peroxide in the presence of gypsum, and (B) an activator,
A bleach composition containing (A)/(B) in a weight ratio of 95/5 to 20/80 and being neutral to weakly alkaline. 2. The activator is from the group consisting of glucose pentaacetate, glucose tetraacetate, 8-acetylated sucrose, triacetin, acetoxybenzenesulfonate, triacetyl cyanuric acid, tetraacetylethylenediamine, tetraacetyl glycoluril, sorbitol hexaacetate A bleach composition according to claim 1 which is selected.