JP3325830B2 - Bleach composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to bleaching compositions, more particularly, to relates to bleach compositions for use in the bleaching of pulp.

[0002]

2. Description of the Related Art Conventionally, fibers such as cellulosic fibers still have a natural pigment in the fibers even after the refining process. Therefore, bleaching is required to remove the natural pigment and secondary adhered coloring matter. Done. As such bleaching agents used for treating fibers, peroxide-based agents, chlorine-containing agents, and the like are generally known. However, chlorine-containing bleaches are expensive and have the drawback of severely corroding the bleaching equipment, and in recent years peroxide-based bleaches have become the mainstream. Also, as a bleaching agent for clothing and the like in general households, a bleaching agent composition containing a peroxide-based bleaching agent as a main component instead of a chlorine-based bleaching agent has begun to spread from the viewpoint of safety.

On the other hand, for bleaching wood pulp such as mechanical pulp (MP) and chemical mechanical pulp (CGP), oxidative bleaching using a peroxide-based chemical as a bleaching agent, sodium hydrosulfite, hydrosulfur A reduction bleaching method using a phytozinc or the like as a bleaching agent is known. However, although the bleaching agent used in the reduction bleaching method is relatively inexpensive, the bleaching ability is not sufficient, and the bleachable pulp is limited to low whiteness pulp. Oxidation bleaching using peroxide-based chemicals has begun to spread. In addition, deinked pulp (D
IP) has shown a significant increase in recent years, and as the bleaching method, an oxidative bleaching method using hydrogen peroxide as a bleaching agent is mainly employed.

In addition, for bleaching chemical pulp such as soda pulp (AP) and kraft pulp (KP), a so-called multi-stage bleaching method combining a chlorine-based oxidizing bleach, a sulfur-containing reducing bleach, and the like is employed. However, the chlorine-based oxidized bleaching agent has a problem that the bleaching device is severely corroded and dioxin is generated due to an increase in residual chlorine and an increase in temperature, as in the case of the above-described fiber bleaching. Therefore, in order to eliminate the drawbacks of these chlorine bleaching agents, the use of peroxide bleaching agents has been expanding in the bleaching of chemical pulp in recent years.

However, peroxides such as hydrogen peroxide have a problem that the bleaching effect is low even when used alone. For this reason, bleaching using hydrogen peroxide as a bleaching agent is mainly performed at high pH using an alkaline agent such as sodium hydroxide.

[0006] Hydrogen peroxide is the most industrially inexpensive source of active oxygen among peroxides.

[0007]

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As described above, peroxyhydroxy ions exhibiting a bleaching effect are produced.

However, when various polyvalent metal ions such as iron ions, copper ions, and manganese ions are present in water or in a bleached substance, the above-mentioned polyvalent metal ions are catalyzed to form peroxyhydroxy ions. No reaction occurs,

[0010]

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As described above, hydrogen peroxide is decomposed wastefully.

Therefore, in order to suppress wasteful decomposition of these peroxide bleaching agents, bleaching aids are usually used.
As the bleaching aid, inexpensive silicate bleaching aids such as sodium silicate are frequently used.

However, since the silicic acid-based bleaching aid does not have a sufficient function of suppressing the useless decomposition of the peroxide-based bleaching agent, for example, a leather cut mark (such as a razor cut mark) is formed on the bleached fiber. ) Or pinholes, or when silicic acid-based bleaching aids are used, the silicic acid or polymerized silicic acid combines with polymetal ions and the like to form so-called insoluble salts (scales), which cause bleaching during the bleaching process. It has the problem of bleaching and depositing on equipment.

Therefore, two methods have been proposed in order to overcome the above-mentioned problems of the silica-based bleaching aid. 1
One is a method using a silicic acid-based bleaching aid substitute, and the other is a method in which a silicate-based bleaching aid is used in combination with another bleaching aid to supplement silicate.

[0015] As an alternative to the above-mentioned silica-based bleaching aid,
For example, sulfites and sodium poly-α-hydroxyacrylate have been proposed. Among them, sulfite is used as a bleaching aid especially for wood pulp.

Examples of the bleaching aid used in combination with the silicic acid-based bleaching aid include aminocarboxylic acids such as ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, hydroxylethylenediaminetriacetic acid and nitrilotriacetic acid, tripolyphosphoric acid, hexametaphosphoric acid, and the like. Condensed phosphoric acid-based bleaching aids such as pyrophosphoric acid have been proposed.

[0017]

However, among the alternatives to the above-mentioned silicate-based bleaching aids, sodium poly-α-hydroxyacrylate is extremely expensive and cannot be used as a substitute for the silicate-based drug. Is the actual situation. On the other hand, sulfites are inexpensive, but combine with alkaline earth metal compounds or aluminum compounds added as polyvalent metals or other bleaching aids in wood to form insoluble salts, for example, refiner plates. There is a problem that a scale trouble easily occurs, for example, a clogged portion is formed on the upper portion.

Further, among the bleaching aids used in combination with the silicic acid-based bleaching aids, aminocarboxylic acid-based bleaching aids have a very small emulsifying and dispersing power on scale, and thus require a large amount of addition. . On the other hand, the condensed phosphoric acid-based bleaching aid flows out into the sea through rivers and the like as wastewater and becomes a causative substance such as red tide. Furthermore, it is hydrolyzed to phosphoric acid under high temperature and high alkali conditions in the bleaching process, and its effect cannot be fully exhibited. Is a causative substance.

When such a large amount of scale is produced, if the bleached material is a fiber, the scale is deposited on the fiber, the whiteness of the fiber is not improved, the bleaching property is poor, and the feeling is also poor. Coarse hardening causes problems in sewing properties.

Therefore, in order to solve the problems of the aminocarboxylic acid-based bleaching aid and the condensed phosphoric acid-based bleaching aid, (meth) acrylic acid,
Although (co) polymers using one or more unsaturated carboxylic acid monomers such as maleic acid and copolymers of olefins with unsaturated dicarboxylic acid monomers have been proposed. Since these (co) polymers have weak chelating ability against manganese ions, iron ions, copper ions and the like, hydrogen peroxide is decomposed wastefully, and the bleached matter is not sufficiently bleached. In addition, the (co) polymer itself easily generates scale with the above-mentioned polyvalent metal ions, and at present, it has not reached a drastic solution.

Further, as a bleaching aid for wood pulp, carboxylic acid polymers such as sodium polyacrylate and sodium polymaleate have been proposed. However, these carboxylic acid polymers do not have sufficient bleaching performance.

In addition, a peroxide bleach composition containing a peroxide as a main component, such as hydrogen peroxide, is gradually catalyzed by a trace amount of polyvalent metal ions in the composition during long-term storage. Special storage containers are required for peroxides to decompose and generate gas.

The bleaching compositions containing the above-mentioned conventional carboxylic acid polymers not only have low bleaching properties, but also have insufficient storage stability, and the peroxides are decomposed with time to reduce the bleaching performance. In addition, the above-mentioned problem of requiring a special storage container for the generated gas has not been solved.

[0024] The present invention has been made in view of the above problems, its object is to provide a superior bleaching composition on the performance of such storage stability and bleaching properties.

[0025]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned conventional problems, and as a result, have found that a monoethylenically unsaturated monomer containing a monoethylenically unsaturated carboxylic acid-based monomer is obtained. A bleaching aid containing a water-soluble graft polymer obtained by graft-polymerizing a component to a polyether compound is suitable as a bleaching agent, particularly a bleaching aid for hydrogen peroxide. The present inventors have found that a bleaching agent composition containing as a bleaching aid has excellent storage stability and bleaching properties and is inexpensive, and has completed the present invention.

That is, the bleaching composition according to the first aspect of the present invention provides a bleaching agent for bleaching pulp in order to solve the above problems.
A whitening agent composition comprising: (1) a bleaching agent containing hydrogen peroxide;
A bleaching aid used together with monoethylenically unsaturated
Monoethylenically unsaturated monomer containing carboxylic acid monomer
Water obtained by graft polymerization of body components to polyether compounds
It is characterized by containing a bleaching aid containing a soluble graft polymer , and (2) hydrogen peroxide as a bleaching agent.

[0027] Claim 2 bleach composition of the described invention, in order to solve the above problems, in the bleaching agent composition of claim 1, further pH adjusting agent, pH of the bleach composition is It is characterized in that it is included in the range of 1 to 7.

The above water-soluble graft polymer has the above constitution.
From gelation resistance, dispersibility, pulp, etc.
Manganese ions, copper ions, and iron ions contained in
Metal ions such as on, nickel ions, cobalt ions, etc.
On-chelation ability is particularly excellent.
Useless decomposition can be suppressed. Because of this, the water
When a soluble graft polymer is used as a bleaching aid,
Bleaching compositions show excellent bleaching and storage stability
You. Therefore, according to the configuration, the bleaching agent composition can suppress useless decomposition of hydrogen peroxide by using the bleaching aid containing the water-soluble graft polymer as the bleaching aid. It is possible to provide a bleaching composition for bleaching pulp, which is excellent in performance such as storage stability and bleaching property.

The above water-soluble graft polymer can be synthesized from the polyether compound (A) and the monoethylenically unsaturated monomer component (B) by graft polymerization, and is relatively inexpensive. Unlike the phosphoric acid-based bleaching aid, it does not flow out to the sea through rivers and the like as wastewater and does not become a causative substance such as red tide.

Further, if hydrogen peroxide is used as the above-mentioned bleaching agent, it is inexpensive, and furthermore, as in the case of using a chlorine-based oxidizing bleaching agent, the bleaching device is seriously corroded and dioxin is generated. No, safe. Hydrogen peroxide is the least expensive source of active oxygen industrially, does not damage fibers, and becomes a liquid when the bleaching composition contains hydrogen peroxide as a bleaching agent. easy. In the case of a liquid bleach composition using hydrogen peroxide, water and a pH adjuster are usually added in addition to the hydrogen peroxide and the water-soluble graft polymer. It is preferable that the above-mentioned pH adjuster is blended so that the pH of the bleaching composition used is in the range of 1 to 7. When the pH is lower than the above range, skin irritation tends to be strong. On the other hand, if the pH exceeds the above range, the storage stability of the bleach composition may be insufficient.

Hereinafter, the present invention will be described in detail. The bleaching aid according to the present invention is obtained by graft-polymerizing a monoethylenically unsaturated monomer component (B) containing a monoethylenically unsaturated carboxylic acid monomer as an essential component to a polyether compound (A). A water-soluble graft polymer.

In the present invention, the polyether compound (A) used as a raw material of the water-soluble graft polymer is not particularly limited, but is preferably a number containing ethylene oxide as a main structural unit. A compound having an average molecular weight of 100 or more, more preferably
It is a compound containing at least 80 mol% of ethylene oxide as a constituent unit.

The above polyether compound (A) can be prepared, for example, by subjecting ethylene oxide and an alkylene oxide copolymerizable with the ethylene oxide (hereinafter, referred to as other alkylene oxide) to water or an alcohol by a known method. It can be easily obtained by polymerization.

The above-mentioned other alkylene oxide is not particularly limited, but propylene oxide or butylene oxide is preferred.

The ratio of the constituent units composed of ethylene oxide and the constituent units composed of other alkylene oxides in the polyether compound (A), that is, the ratio of the ethylene oxide used for producing the polyether compound (A) to the other alkylene compound The ratio of use with oxide is
Ethylene oxide is 80 mol% or more of the whole, and the amount of the other alkylene oxide is 20 mol% as a whole.
It is preferred to be less than. If the amount of the other alkylene oxide is 20 mol% or more, the graft ratio of the water-soluble graft polymer obtained using the polyether compound (A) may be reduced.

The alcohol for obtaining the polyether compound (A) is specifically, for example, a primary or secondary alcohol having 1 to 22 carbon atoms such as methanol, ethanol, n-propanol and n-butanol. Grade alcohol;
3-18 carbon atoms such as isopropanol and 2-butanol
Secondary alcohols; tertiary alcohols such as t-butanol; diols such as ethylene glycol, diethylene glycol, propanediol, butanediol and propylene glycol; triols such as glycerin and trimethylolpropane; polyols such as sorbitol; Aromatic alcohols such as naphthol; and the like, but are not particularly limited thereto.

The number average molecular weight of the polyether compound (A) thus obtained is preferably 100 or more, more preferably 500 or more. The upper limit of the number average molecular weight of the polyether compound (A) is not particularly limited, but is preferably 2
000 or less, and the polyether compound (A)
When the compound has two or more hydroxyl groups, the number is preferably 6,000 or less. When the number average molecular weight of the polyether compound (A) is less than 100, the amount of the polyether compound (A) not involved in the graft polymerization increases. Also,
If the number average molecular weight exceeds 20,000, the gelation resistance may decrease, and the polyvalent metal ion chelating ability may decrease.

As the polyether compound (A), all or some of the terminal hydroxyl groups have 2 to 2 carbon atoms.
22 fatty acids, succinic acid, succinic anhydride, maleic acid,
Also included are those esterified with dicarboxylic acids such as maleic anhydride and adipic acid.

Further, among the raw materials for the water-soluble graft polymer, the above-mentioned monoethylenically unsaturated monomer component (B)
Contains a monoethylenically unsaturated carboxylic acid-based monomer as an essential component.

In the present invention, (meth) acrylic acid is particularly preferred as the monoethylenically unsaturated carboxylic acid-based monomer. ) Acrylic acid is 40 mol% to 1
Preferably, it is contained within the range of 00 mol%.

In the present invention, the graft ratio of the monoethylenically unsaturated monomer component (B) to the above polyether compound (A) is such that the graft ratio of the monoethylenically unsaturated monomer component (B) to the polyether compound (A) is 100% by weight. The unsaturated monomer component (B) is preferably graft-polymerized in an amount of 25% by weight or more, and among the monoethylenically unsaturated monomer components (B), monoethylenically unsaturated carboxylic acid monomers More preferably, (meth) acrylic acid is graft-polymerized in an amount of 20% by weight or more based on 100% by weight of the polyether compound (A). When the ratio of the monoethylenically unsaturated monomer component (B) to the polyether compound (A) is less than 25% by weight, the carboxylic acid density of the obtained water-soluble graft polymer decreases, and various performances, for example, And polyvalent metal ion chelating ability, dispersing ability and the like are not satisfied. When the amount of the monoethylenically unsaturated monomer component (B) used is 100% by weight or more, the amount of carboxylic acid (carboxylic acid density) in the obtained water-soluble graft polymer becomes too high, and The resulting water-soluble graft polymer is easily gelled by the metal ions.

The monoethylenically unsaturated monomers copolymerizable with the (meth) acrylic acid, that is, the monoethylenically unsaturated carboxylic acid monomers other than the (meth) acrylic acid and the monoethylenically unsaturated monomers The monoethylenically unsaturated monomer other than the saturated carboxylic acid-based monomer (hereinafter collectively referred to as other monoethylenically unsaturated monomers) is not particularly limited, Specific examples of the monoethylenically unsaturated carboxylic acid-based monomer other than (meth) acrylic acid include maleic acid, fumaric acid, maleic anhydride and the like. Specific examples of monoethylenically unsaturated monomers other than these monoethylenically unsaturated carboxylic acid monomers include, for example, alkyl esters of maleic acid such as dimethyl maleate and diethyl maleate; Alkyl esters of fumaric acid such as dimethyl fumarate and diethyl fumarate; alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and stearyl (mear) acrylate; hydroxyethyl ( Hydroxyalkyl (meth) acrylates such as meth) acrylate and hydroxypropyl (meth) acrylate; alkenyl acetates such as vinyl acetate; aromatic vinyls such as styrene; (meth) acrylonitrile, (meth) acrolein, (meth) acrylamide Dimethylaminoethyl (meth) dialkylaminoethyl acrylates such as (meth) acrylate; 2-
Acrylamide-2-methylpropanesulfonic acid and the like can be mentioned. One of these other monoethylenically unsaturated monomers may be used alone, or two or more of them may be used as a mixture. Among these other monoethylenically unsaturated monomers, maleic acid, from the viewpoint of increasing the carboxylic acid density and dispersibility of the obtained water-soluble graft polymer,
It is preferable to use fumaric acid and maleic anhydride together with the above (meth) acrylic acid.

In the above monoethylenically unsaturated monomer component (B), the ratio of (meth) acrylic acid to other monoethylenically unsaturated monomers copolymerizable with the water-soluble graft polymer is From the rate of introduction of the acid and the amount of the residual monomer, 0 mol% to 6 mol% of the other monoethylenically unsaturated monomer is added to 40 mol% to 100 mol% of (meth) acrylic acid.
It is preferably within the range of 0 mol% (however, the total of both is 100 mol%). In particular, for the purpose of improving the function as a bleaching aid, it is more preferable to use maleic acid in the range of 20 mol% to 50 mol%, more preferably 30 mol%.
Most preferably, it is used within the range of ~ 45 mol%.

The monoethylenically unsaturated monomer component (B) is a monoethylenically unsaturated monomer other than the monoethylenically unsaturated carboxylic acid monomer among other monoethylenically unsaturated monomers. When an unsaturated monomer is contained, the content of a monoethylenically unsaturated monomer other than the unsaturated carboxylic acid-based monomer (that is, a monoethylenically unsaturated monomer having no carboxyl group) Is preferably 20 mol% or less. When the content of the monoethylenically unsaturated monomer other than the unsaturated carboxylic acid-based monomer exceeds 20 mol%, the rate of introduction of the carboxylic acid into the obtained water-soluble graft polymer is reduced and remains. As the amount of the monomer increases, the carboxylic acid density decreases, and the polyvalent metal ion chelating ability,
It is not preferable because the dispersing ability and the like are not satisfied.

When a monoethylenically unsaturated carboxylic acid monomer other than (meth) acrylic acid is used as the other monoethylenically unsaturated monomer, the content of (meth) acrylic acid is reduced. Even if it is less than 40 mol%, the carboxylic acid density of the obtained water-soluble graft polymer does not decrease. However, in this case, if the content of (meth) acrylic acid is less than 40 mol%, the introduction rate of maleic acid, fumaric acid, maleic anhydride, etc. into the above water-soluble graft polymer decreases, and There is a tendency for the amount of monomer to be increased.

In the present invention, the graft polymerization of the polyether compound (A) and the monoethylenically unsaturated monomer component (B) is carried out in the presence of a polymerization initiator substantially without using a catalyst and a solvent. Done.

When the polyether compound (A) and the monoethylenically unsaturated monomer component (B) are graft-polymerized in the presence of water or an organic solvent such as alcohol or toluene, the polyether compound It is not preferable because the grafting efficiency of the monoethylenically unsaturated monomer (B) to (A) decreases. Therefore, when a solvent is used for adding the polymerization initiator or the monoethylenically unsaturated monomer component (B), it is preferable to minimize the amount. Specifically, the amount is preferably 5% by weight or less based on the total amount of the polymerization reaction system, or it is preferable to distill off the polymerization reaction system immediately after adding the solvent.

As the above-mentioned polymerization initiator, known radical polymerization initiators can be used, and among them, organic peroxides are particularly preferable. Specific examples of the organic peroxide that can be used as the radical polymerization initiator in the present invention include ketone peroxides such as methyl ethyl ketone peroxide and cyclohexanone peroxide; t-butyl hydroperoxide and cumene. Hydroperoxide, diisopropylbenzene hydroperoxide, p-menthane hydroperoxide, 2,5-dimethylhexane-2,5
Hydroperoxides such as dihydroperoxide and 1,1,3,3-tetramethylbutyl hydroperoxide; di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide;
dialkyl peroxides such as α, α′-bis (t-butylperoxy) p-diisopropylbenzene and α, α′-bis (t-butylperoxy) p-diisopropylhexyne; t-butylperoxyacetate; t-butylperoxylaurate, t-butylperoxybenzoate, di-t-butylperoxyisophthalate,
Peroxyesters such as 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butylperoxyisopropyl carbonate; n-butyl-4,
4-bis (t-butylperoxy) valeate, 2,2
Peroxy ketals such as -bis (t-butylperoxy) butane; diacyl peroxides such as dibenzoyl peroxide; and the like.

The use amount of these polymerization initiators is not particularly limited, but is used in a proportion of 0.1% by weight to 15% by weight based on the monoethylenically unsaturated monomer component (B). Preferably, it is used at a ratio of 0.5% by weight to 10% by weight. When the amount of the polymerization initiator used is out of the above range, the graft polymerization efficiency of the monoethylenically unsaturated monomer component (B) to the polyether compound (A) decreases. The polymerization initiator may be added to the polyether compound (A) in advance, or may be added simultaneously with the monoethylenically unsaturated monomer component (B).

The polymerization temperature is 100 ° C. or higher, and preferably 110 ° C. to 16 ° C. from the viewpoint of improving the function of the bleaching aid.
0 ° C, more preferably 110 ° C to 140 ° C.
It is in the range of ° C. When the polymerization temperature is lower than 100 ° C., the grafting efficiency of the monoethylenically unsaturated monomer component (B) to the polyether compound (A) decreases. on the other hand,
When the polymerization temperature exceeds 160 ° C., the polyether compound (A) and the obtained water-soluble graft polymer may be thermally decomposed.

In the present invention, when performing the graft polymerization, it is preferable to initially charge a part or the entire amount of the polyether compound (A). In the monoethylenically unsaturated monomer component (B), the other monoethylenically unsaturated monomer may be a monoethylenically unsaturated carboxylic acid-based monomer such as maleic acid, fumaric acid, or maleic anhydride. In the case of using, at least half of these other monoethylenically unsaturated monomers are initially charged and mixed in advance with the polyether compound (A), and the resulting mixture is heated to 100 ° C. or higher. It is particularly preferable that the remaining monoethylenically unsaturated monomer component (B) and the polymerization initiator are separately added to this mixture to carry out graft polymerization. As a method of separately adding the monoethylenically unsaturated monomer component (B) and the polymerization initiator, for example, using a dropping device, the monoethylenically unsaturated monomer component (B) A method in which the polymerization initiator and the polymerization initiator are simultaneously dropped from a separate dropping device into the above mixture may be mentioned, but the method is not particularly limited.

By employing the above method, the rate of introduction of a monoethylenically unsaturated carboxylic acid-based monomer such as maleic acid, fumaric acid, maleic anhydride or the like into a water-soluble graft polymer can be greatly improved. Can be. When part of the polyether compound (A) is initially charged, the remaining polyether compound (A) is mixed with a polymerization initiator or a monoethylenically unsaturated monomer component (B) and added. May be.

The water-soluble graft polymer thus obtained is a polymer having a solubility in water of 1% or more.
The water-soluble graft polymer can be used as it is as a bleaching aid, but after the completion of the graft polymerization reaction, a basic compound is added to neutralize it, for example, to obtain a monovalent salt such as a sodium salt or a potassium salt. Metal salts; divalent metal salts such as calcium salts; trivalent metal salts such as aluminum salts; ammonium salts; organic amine salts such as monoethanolamine salts and triethanolamine salts; It may be partially neutralized or completely neutralized before use. The solvent used when adding the above basic compound is preferably water, but is not particularly limited.

The weight-average molecular weight of the water-soluble graft polymer is not particularly limited, but may be 500 to 500.
Preferably it is in the range of 50,000. When the above-mentioned weight average molecular weight is less than 500, the chelating power is reduced, and as a result, the bleachability tends to be reduced. On the other hand, when the weight average molecular weight exceeds 50,000, the water-soluble graft polymer tends to gel due to polyvalent metal ions, and the bleachability tends to decrease.

As described above, the above-mentioned water-soluble graft polymer has a high graft ratio, gelation resistance, dispersing ability, manganese ion, copper ion, iron ion eluted from pulp or the like or contained in service water. It is particularly excellent in the ability to chelate polyvalent metal ions such as ions, nickel ions, and cobalt ions.

Therefore, when the above water-soluble graft polymer is used as a bleaching aid together with a bleaching agent containing hydrogen peroxide, it is not clear why the bleaching property of the bleached material is high. By blending the water-soluble graft polymer as a bleaching aid into the bleaching composition, (1) chelating the polyvalent metal ion to suppress the catalytic action of the polyvalent metal ion and prevent wasteful decomposition of hydrogen peroxide. Suppress the scale and promote the generation of peroxyhydroxy ions,
It is also considered that (2) the generated scale is dispersed to suppress deposition on the bleached material. In particular, when the bleached material is a fiber, if the scale is deposited on the fiber, the whiteness of the fiber is not improved, the bleaching property is inferior, and the feeling is coarsely hardened, which causes a problem in sewing.

In the present invention, the above-mentioned water-soluble graft polymer can be used alone as an inexpensive bleaching aid instead of a silicic acid-based drug, and can be used alone as a bleaching aid. Auxiliaries, for example, condensed phosphates such as aminocarboxylates, silicates, sulfites and tripolyphosphates; alkaline earth metal compounds such as magnesium and calcium; aluminum compounds; polycarboxylic acids such as polyacrylates It may be used in combination with a bleaching aid such as a salt or a poly-α-hydroxyacrylate. That is, the bleaching aid according to the present invention may contain the above-described conventionally known bleaching aid within a range that does not impair the performance of the water-soluble graft polymer.

The bleaching composition according to the present invention comprises a bleaching agent,
Preferably, it contains a peroxide bleaching agent as a main component and also contains the above-mentioned bleaching aid as an auxiliary of the bleaching agent. As the bleaching agent, a bleaching agent containing hydrogen peroxide is used.

Examples of the above-mentioned peroxide other than hydrogen peroxide used as a bleaching agent in the present invention include, for example, hydrogen peroxide, percarbonates such as sodium percarbonate and potassium percarbonate, and sodium peroxide. , Peracetic acid and the like. Among the above-mentioned peroxides, hydrogen peroxide and percarbonate are preferable, and among them, hydrogen peroxide is an industrially inexpensive source of active oxygen and has little damage to fibers, and When the bleach composition contains hydrogen peroxide as a bleach, it becomes liquid and easy to use,
Particularly preferred. When the bleaching composition contains a percarbonate as a bleaching agent, it becomes a liquid or solid composition.

The water-soluble graft polymer is not only a bleaching aid for peroxide bleaching agents as described above, but also has a slightly lower effect, but is not limited to chlorine, bleached powder, chlorine dioxide, chlorite, etc. And a bleaching aid for a sulfur-containing reducing bleach such as sodium hydrosulfite, zinc hydrosulfite, thiosulfate, sulfite, and bisulfite.

The bleaching composition is particularly excellent in storage stability and bleaching performance by using the bleaching aid containing the water-soluble graft polymer as a bleaching aid for the bleaching agent containing hydrogen peroxide. ing. Moreover, since the water-soluble graft polymer is particularly excellent in the ability to chelate and disperse polyvalent metal ions, the use of a bleaching aid containing the water-soluble graft polymer suppresses the generation and deposition of scale. And a scale trouble can be suppressed.

The water-soluble graft polymer is relatively inexpensive because it can be synthesized from the polyether compound (A) and the monoethylenically unsaturated monomer component (B) by graft polymerization. Unlike the phosphoric acid-based bleaching aid, it does not flow out into the sea through rivers or the like as wastewater and does not become a causative substance such as red tide.

Further, if a peroxide bleaching agent such as hydrogen peroxide is used as the bleaching agent, it is inexpensive. Moreover, as in the case of using a chlorine-based oxidizing bleaching agent, the bleaching device is severely corroded or dioxin is not used. It is safe without any problems such as the occurrence of problems.

The bleaching object to which the bleaching with the bleaching agent composition can be applied is not particularly limited, but, for example, fiber; pulp; and the like are particularly preferable.

Specific examples of the above-mentioned fibers include cellulose-based natural fibers such as cotton and hemp; cellulose-based regenerated fibers such as rayon and cupra; and synthesis of these cellulose-based fibers with nylon, polyester, and acrylic. Mixed fibers with fibers; mixed fibers of these cellulosic fibers and semi-synthetic fibers such as acetate; and the like, but are not particularly limited thereto. Furthermore, the form at the time of bleaching of these fibers is not particularly limited, and may be any form such as fibers, yarns, cheeses, woven fabrics, knitted fabrics, nonwoven fabrics, and even final textile products such as clothes and bedding products. No problem.

The pulp is, specifically,
For example, mechanical pulp (MP) and chemical mechanical pulp (CG)
Wood pulp such as high yield pulp such as P); deinked pulp (DIP); chemical pulp such as soda pulp (AP) and kraft pulp (KP); and the like, but not particularly limited thereto. Further, the form at the time of bleaching of the pulp is not particularly limited, and may be a pulp slurry or a form of a final pulp product such as paper.

When fibers are bleached using the above bleaching agent composition, the bleaching method may be, for example, a pad steam method, a pressure boiling method, a boiling method, or a dipping method depending on the form of the fiber to be bleached. Various bleaching methods known in the art, such as a bleaching method, can be selected. Further, the bleaching agent composition can be applied to bleaching performed in one bath at the same time as other steps, such as refining / bleaching; desizing / refining / bleaching;

The amount of the bleaching composition used for bleaching the fibers by such a method may be appropriately set according to the composition of the bleaching composition, the type and form of the fibers, the bleaching method and the like. Is usually used at a ratio of 0.1% by weight to 50% by weight based on the fiber to be bleached.

When the bleaching composition is used as a bleaching composition for bleaching fibers, the blending ratio of the water-soluble graft polymer in the bleaching composition is not particularly limited. 0.5% to 5%
It is preferably in the range of 0% by weight, more preferably in the range of 1% to 30% by weight, and most preferably in the range of 2% by weight to 20% by weight.

If the blending ratio of the water-soluble graft polymer is less than 0.5% by weight, the bleachability tends to decrease. Further, the mixing ratio of the water-soluble graft polymer is set to 50.
Even if the amount is more than 10% by weight, further improvement in bleaching performance and the like in proportion to the increase in the amount of the water-soluble graft polymer cannot be expected, and a part of the added water-soluble graft polymer is wasted, which is economically disadvantageous. Is not preferred.

The mixing ratio of the bleaching agent in the bleaching composition is not particularly limited, but
It is preferably in the range of 5% to 99.5% by weight, more preferably in the range of 10% to 90% by weight, and 15% by weight.
Most preferably, it is in the range of -80% by weight.

Further, the blending ratio of the blend (other blends) other than the bleaching agent and the water-soluble graft polymer in the bleaching agent composition is not particularly limited. It is used in the range of from 45% by weight to 45% by weight (provided that the total amount of the bleaching agent, the water-soluble graft polymer, and other compounds is 100% by weight).

In this case, the above-mentioned bleaching composition may be added, if necessary, as other components to a bleaching aid other than the above-mentioned water-soluble graft polymer or an additive commonly used in bleaching compositions for fibers. May be included.

For example, when the above-mentioned bleaching composition is used as a bleaching composition for bleaching fibers, particularly when used as a household bleaching composition for clothing or the like, the above-mentioned bleaching composition contains Preferably, a surfactant is further contained.

The surfactant is not particularly limited and a wide range can be used. Specifically, for example, linear alkyl benzene sulfonate, polyoxyethylene alkyl ether sulfate, α -Anionic surfactants such as olefin sulfonates and alkyl sulfates; nonionic surfactants such as polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether; and amphoteric surfactants such as betaine type. The amount of the surfactant in the bleach composition is not particularly limited, but is preferably 0.1% by weight or less.
It is used within the range of 20% by weight.

In the case of a liquid bleaching composition using hydrogen peroxide as the bleaching agent, usually, in addition to the hydrogen peroxide and the water-soluble graft polymer, water and p
An H adjuster is blended.

The pH adjuster is not particularly limited, but specific examples thereof include inorganic acids such as hydrochloric acid and sulfuric acid; organic acids such as citric acid, malic acid and gluconic acid;
Alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; and the like are used.

The above-mentioned pH adjuster is preferably blended so that the pH of the bleaching composition to be used falls within a range of 1 to 7, and is blended so as to fall within a range of 2 to 6.5. Is more preferable. When the pH is lower than the above range, skin irritation tends to be strong. On the other hand, if the pH exceeds the above range, the storage stability of the bleach composition may be insufficient.

Further, the bleaching agent composition may optionally contain a coloring agent such as a pigment or a dye for coloring. Specific examples of the above pigment include, for example, Color Index Bat Blue 4, Color Index Bat Blue 6, Color Index Pigment Blue 22, Color Index Bat Red 23, Color Index Pigment Blue 15, Color Index Pigment Blue 17, Color Organic pigments such as Index Pigment Green 36; and navy blue or ultramarine or cobalt-based pigments, cadmium-based pigments, inorganic pigments such as iron oxide and titanium dioxide; and the like, but are not particularly limited.

Specific examples of the dye include, for example, Color Index Acid Blue 229, Color Index Acid Blue 9, Color Index Acid Blue 112, Alizarine Fast Blue ERL (manufactured by Yamada Chemical Co., Ltd.), Alizarine Fast Blue 3GL ( (Yamada Chemical Co., Ltd.)
And acidic dyes such as Fastogen Blue 5380 (manufactured by Dainippon Ink); metal-containing dyes such as Color Index Acid Red 198, Color Index Acid Blue 158, Color Index Acid Green 35, Color Index Direct Blue 86, and Color Index Direct Blue 199. Dyes; and the like,
There is no particular limitation.

Further, it is apparent from the above description that the above-mentioned bleaching composition can be blended with a bleaching aid conventionally used in household bleaching compositions such as clothing. No. Examples of such bleaching aids include condensed phosphoric acid aids such as sodium tripolyphosphate and potassium pyrophosphate; amino acids such as ethylenediaminetetraacetic acid (salt), diethylenetriaminepentaacetic acid (salt), and nitrilotriacetic acid (salt). Carboxylic acid (salt); organic phosphonic acid (salt) such as alkylidene diphosphonic acid (salt) and nitrilotrimethylene phosphonic acid (salt); poly-α-hydroxyacrylic acid (salt), sodium polyacrylate, sodium polymaleate and the like Carboxylic acid polymers; and the like.

When pulp is bleached using the above-described bleaching agent composition, a conventionally known oxidation bleaching method using a peroxide bleaching agent as a bleaching agent is preferably used. .

The amount of the bleaching composition used in bleaching the pulp by the oxidative bleaching method may be appropriately set according to the composition of the bleaching composition, the type and form of the pulp, the bleaching method and the like. Is usually used at a ratio of 2% by weight to 50% by weight based on the bleached pulp.

When the bleaching composition is used as a bleaching composition for pulp bleaching, the blending ratio of the water-soluble graft polymer in the bleaching composition is not particularly limited. 0.2% by weight
It is preferably in the range of 30% by weight, more preferably in the range of 0.5% to 20% by weight, and most preferably in the range of 1.0% to 10% by weight.

If the blending ratio of the water-soluble graft polymer is less than 0.2% by weight, the bleachability tends to decrease. The mixing ratio of the water-soluble graft polymer is 30.
Even if the amount is more than 10% by weight, further improvement in bleaching performance and the like in proportion to the increase in the amount of the water-soluble graft polymer cannot be expected, and a part of the added water-soluble graft polymer is wasted, which is economically disadvantageous. Is not preferred.

The mixing ratio of the bleaching agent in the bleaching composition is not particularly limited, but
It is preferably in the range of 20% by weight to 99.5% by weight, and 30% by weight.
More preferably, it is in the range of 40% to 90% by weight, most preferably in the range of 40% to 90% by weight.

Further, the blending ratio of the blend (other blends) other than the bleaching agent and the water-soluble graft polymer in the bleaching agent composition is not particularly limited. It is used in the range of 50% by weight to 50% by weight (provided that the total amount of the bleaching agent, the water-soluble graft polymer, and other compounds is 100% by weight).

In this case, if necessary, the above-mentioned bleaching composition may be used as other components as bleaching aids other than the above-mentioned water-soluble graft polymer, and additives which are commonly used in bleaching compositions for pulp. May be included.

As described above, the bleaching aid according to the present invention is a bleaching aid used together with a bleaching agent containing hydrogen peroxide, and comprises a monoethylenic unsaturated carboxylic acid monomer. The composition contains a water-soluble graft polymer obtained by graft-polymerizing the unsaturated monomer component (B) to the polyether compound (A). Further, the bleaching composition according to the present invention has a configuration containing the above-mentioned bleaching aid and bleaching agent.

According to the above construction, the bleaching composition has high water solubility by containing the water-soluble graft polymer having the above construction as a bleaching aid for a bleach containing hydrogen peroxide. Shows excellent bleaching and storage stability. The water-soluble graft polymer is relatively inexpensive because it can be synthesized from the polyether compound (A) and the monoethylenically unsaturated monomer component (B) by graft polymerization. Unlike bleaching aids, it does not flow out into the sea as wastewater through rivers, etc., and does not cause red tide or other causative substances. Furthermore, if a peroxide bleach such as hydrogen peroxide is used as the bleach, it is inexpensive, and as in the case of using a chlorine-based oxidized bleach, the bleaching device is severely corroded and dioxin is generated. No, safe.

[0091]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto. In the Examples and Comparative Examples, “parts” indicates “parts by weight”, and “%” indicates
"% By weight" is shown.

Example 1 Polyethylene having a number average molecular weight of 200 as a polyether compound (A) was placed in a glass reactor equipped with a thermometer, a stirrer, a nitrogen gas inlet tube, two dropping devices, and a reflux condenser. 100 parts of glycol, 51.8 parts of maleic acid as a monoethylenically unsaturated monomer component (B) and p-
4.5 parts of toluenesulfonic acid monohydrate were charged.
In addition, 48.2 parts of acrylic acid, which is a monoethylenically unsaturated carboxylic acid monomer, was charged into one dropping device, and perbutyl I (trade name; Nippon Oil & Fat Co., Ltd.) as a polymerization initiator was charged into the other dropping device. 8 parts of t-butyl peroxyisopropyl monocarbonate (produced by the company, containing 95%).

Next, the contents in the reactor were heated and dissolved while stirring under a nitrogen gas stream, and the temperature was raised to 128 ° C. Subsequently, the temperature of the contents in the reactor was increased to 126
The acrylic acid and perbutyl I were continuously added dropwise over 1 hour while maintaining the temperature in a temperature range of from 0 ° C. to 131 ° C., followed by stirring for further 1 hour to perform graft polymerization.

As a result, the graft polymer of the present invention had a weight average molecular weight of 5,000 and a graft ratio of 80.
%, A water-soluble graft polymer (1) having a purity of 85%.
Subsequently, a predetermined amount of water was added to the water-soluble graft polymer (1) and neutralized with an aqueous sodium hydroxide solution to adjust the pH of the aqueous solution of the water-soluble graft polymer (1) to 8, and the present invention Thus, a sodium salt of the water-soluble graft polymer (1) was obtained as a bleaching aid.

Next, in a polyethylene bottle having a capacity of 600 ml, 71.4 g of 35% hydrogen peroxide solution, 15 g of polyoxyethylene alkyl ether, 35 g of sodium linear alkylbenzene sulfonate, and the above water-soluble graft polymer (1) were prepared. 10 g of sodium salt (in terms of solid content) and 300 g of tap water were added and uniformly dissolved. The carbon number of the alkyl group in the polyoxyethylene alkyl ether is 12, and the average addition mole number of ethylene oxide is 10 mol. The alkyl group in sodium linear alkylbenzene sulfonate has 12 carbon atoms. Subsequently, the solution in the bottle was adjusted to pH 4.5 with dilute sulfuric acid, and tap water was added to adjust the total volume to 50%.
By adjusting to 0 g, the solution in the bottle was obtained as the bleach composition according to the present invention.

Then, the above bottle was sealed and used as a storage container, left at 55 ° C. for 14 days.
The storage stability of the bleach composition was evaluated by visually observing the state of the bottle. The evaluation criteria are as follows. A state in which no swelling is observed in the storage container (bottle) is marked with “○”, a state in which slight swelling is recognized in the storage container is marked with “△”, and a state in which considerable swelling is recognized in the storage container is marked with “x” did.

On the other hand, a new bleach composition was prepared in the same manner as described above, and this bleach composition was added to Fe
Dissolved in 1 liter of tap water containing 10 ppm of ³⁺ ions so that the effective oxygen concentration becomes 0.05%,
The temperature was set to 30 ° C. to obtain a test solution for measuring the bleaching ratio. After immersing five pieces of black tea-stained cloth prepared by the method described below in this test liquid for 30 minutes, the cloth was washed with a predetermined amount of tap water for a predetermined time, and further dried under predetermined conditions.

[0098]

(Equation 1)

According to the above, the bleaching ratio of the black tea-contaminated cloth with the above-mentioned bleach composition was calculated.

The black tea-stained cloth was prepared by the following method. First, 80 g of black tea was boiled with 3 liters of ion-exchanged water for 15 minutes and then filtered with desizing bleached cotton. Then, a cotton gold cloth # 2003 cloth was immersed in the filtrate, boiled for 15 minutes, and allowed to cool for 2 hours. Then, this cotton gold cloth # 2
The 003 cloth was taken out of the filtrate, allowed to air dry, and then washed with water until the washing liquid was no longer colored. Then, after dehydrating and pressing this cotton gold cloth # 2003 cloth, 8 cm
A test piece of × 8 cm was used as a black tea-stained cloth for calculating the bleaching rate. The obtained bleaching ratio is shown in Table 1 together with the storage stability.

Example 2 Example 1 was repeated except that in place of polyethylene glycol having a number average molecular weight of 200, 100 parts of naphthoxy polyethylene glycol having a number average molecular weight of 600 was used as the polyether compound (A). The same reaction and operation as in Example 1 were performed to obtain a water-soluble graft polymer (2). The average number of moles of ethylene oxide added to naphthol in the above naphthoxy polyethylene glycol is 10 mol. The weight average molecular weight of the obtained water-soluble graft polymer (2) was 5,500, the graft ratio was 82%, and the purity was 86%. Subsequently, a predetermined amount of water was added to the water-soluble graft polymer (2) and neutralized with an aqueous sodium hydroxide solution to adjust the pH of the aqueous solution of the water-soluble graft polymer (2) to 8, and the present invention Thus, a sodium salt of a water-soluble graft polymer (2) was obtained as the bleaching aid.

Next, in the same manner as in Example 1, except that the sodium salt of the water-soluble graft polymer (2) was used instead of the sodium salt of the water-soluble graft polymer (1). Was carried out to obtain a bleaching composition. The storage stability of this bleach composition was evaluated in the same manner as in Example 1. The bleaching rate of the black tea-contaminated cloth with the above-mentioned bleach composition was calculated in the same manner as in Example 1. The obtained bleaching ratio is shown in Table 1 together with the storage stability.

Example 3 Example 1 was repeated except that 200 parts of naphthoxy polyethylene glycol having a number average molecular weight of 1,000 was used as the polyether compound (A) in place of polyethylene glycol having a number average molecular weight of 200. The same reaction and operation as in Example 1 were performed to obtain a water-soluble graft polymer (3). The average number of moles of ethylene oxide added to naphthol in the above naphthoxy polyethylene glycol is 20.
Is a mole. The weight average molecular weight of the obtained water-soluble graft polymer (3) was 4,300, the graft ratio was 80%, and the purity was 83%. Subsequently, a predetermined amount of water was added to the water-soluble graft polymer (3) and neutralized with an aqueous sodium hydroxide solution to adjust the pH of the aqueous solution of the water-soluble graft polymer (3) to 8, and the present invention Thus, a sodium salt of a water-soluble graft polymer (3) was obtained as the bleaching aid.

Next, in the same manner as in Example 1, except that the sodium salt of the water-soluble graft polymer (3) was used instead of the sodium salt of the water-soluble graft polymer (1). Was carried out to obtain a bleaching composition. The storage stability of this bleach composition was evaluated in the same manner as in Example 1. The bleaching rate of the black tea-contaminated cloth with the above-mentioned bleach composition was calculated in the same manner as in Example 1. The obtained bleaching ratio is shown in Table 1 together with the storage stability.

[Example 4] In Example 1, instead of polyethylene glycol having a number average molecular weight of 200, an adduct 200 obtained by averaging 7 mol of ethylene oxide to an alkyl having 12 to 15 carbon atoms was used as a polyether compound (A). A water-soluble graft polymer (4) was obtained by carrying out the same reaction and operation as in Example 1 except that the parts were used. The weight average molecular weight of the obtained water-soluble graft polymer (4) was 6,800, and the graft ratio was 78.
% And the purity was 82%. Subsequently, a predetermined amount of water was added to the water-soluble graft polymer (4) and neutralized with an aqueous sodium hydroxide solution to adjust the pH of the aqueous solution of the water-soluble graft polymer (4) to 8, and the present invention Thus, a sodium salt of a water-soluble graft polymer (4) was obtained as the bleaching aid.

Next, in the same manner as in Example 1, except that the sodium salt of the water-soluble graft polymer (4) was used instead of the sodium salt of the water-soluble graft polymer (1). Was carried out to obtain a bleaching composition. The storage stability of this bleach composition was evaluated in the same manner as in Example 1. The bleaching rate of the black tea-contaminated cloth with the above-mentioned bleach composition was calculated in the same manner as in Example 1. The obtained bleaching ratio is shown in Table 1 together with the storage stability.

Comparative Examples 1 to 6 The procedure of Example 1 was repeated, except that the bleaching aid shown in Table 1 was used instead of the sodium salt of the water-soluble graft polymer (1). A bleach composition for comparison was obtained. The storage stability of each bleach composition was evaluated in the same manner as in Example 1. The bleaching ratio of the black tea-contaminated cloth with each bleaching composition was calculated in the same manner as in Example 1. The obtained bleaching ratio is shown in Table 1 together with the storage stability.

[0108]

[Table 1]

Reference Example 1 First, the water-soluble graft polymer (1) obtained in Example 1
A bleaching composition was obtained using the sodium salt of in accordance with the amounts shown below. C _14-18 α-olefin sodium sulfonate 10% Chained alkyl (C ₁₂ ) sodium benzene sulfonate 10% Sophthanol EP12050 (manufactured by Nippon Shokubai) 5% C ₁₈ fatty acid sodium 5% sodium carbonate 20% sodium percarbonate 20 % Tetraacetylethylenediamine 6% zeolite 8% sodium salt of water-soluble graft polymer (1) 3% sodium sulfate 6% water 7% Next, a so-called mayonnaise bottle made of glass (capacity: 225 m)
l), 150 ml of the above-mentioned bleach composition is added, and 45 ° C. →
It was stored for one month under the recycling condition of 25 ° C. → 45 ° C. as one cycle. Then, 5 g of the bleach composition after storage
, A 50% acetic acid aqueous solution (50 ml) was added thereto, and the amount of available oxygen in the bleach composition was determined by iodometry.

[0110]

(Equation 2)

The effective oxygen residual ratio was calculated according to the following. Table 2 shows the results.

Reference Examples 2 to 4 In the same manner as in Reference Example 1, except that the bleaching aid shown in Table 2 was used instead of the sodium salt of the water-soluble graft polymer (1). A bleach composition according to the present invention was obtained. The effective oxygen remaining rate of each bleaching composition was calculated in the same manner as in Reference Example 1. Table 2 shows the results.

Comparative Reference Examples 1 to 4 In the same manner as in Reference Example 1, except that the bleaching aid shown in Table 2 was used instead of the sodium salt of the water-soluble graft polymer (1). Thus, a bleach composition for comparison was obtained. The effective oxygen remaining rate of each bleaching composition was calculated in the same manner as in Reference Example 1. Table 2 shows the results.

[0114]

[Table 2]

REFERENCE EXAMPLE 5 A cotton sheet woven knit knitted by using the sodium salt of the water-soluble graft polymer (1) obtained in Example 1 as a bleaching aid was bleached. The bleaching conditions are as follows.

Water used: A water bath ratio (a weight ratio of water used to a cotton knitted knitted knit) of Himeji City water to which Cu ²⁺ , Fe ³⁺ , and Mn ²⁺ were added at a ratio of 10 ppm each 1 to 25 Temperature 85 ° C. Time 30 minutes Chemicals used Hydrogen peroxide 10 g / liter Sodium hydroxide 2 g / liter No. 3 sodium silicate 5 g / liter Sodium salt of water-soluble graft polymer (1) 2 g / liter Texture, whiteness,
The sewing property was evaluated by the following method. Feeling was determined by a sensory test. Those with a soft feel were marked with “○”, those with a slightly hard feel were marked with “△”, and those that were fairly hard were marked with “x”.

The whiteness (W) was measured by using a 3M Color Computer SM-3 (manufactured by Suga Test Instruments Co., Ltd.) to measure the lightness of the bleached cotton knitted knit and the chromaticity index at coordinates a and b. Measure the color and use the La
b system whiteness formula

[0118]

(Equation 3)

Calculated according to the following.

[0120] The sewing property was evaluated by the number of broken yarns in the case where four layers of bleached cotton sheet knit were knitted and sewn 30 cm with a lockstitch sewing machine. A # 11S needle was used as a sewing needle. Table 3 also shows these results.

[0121] In Reference Example 6-8] Reference Example 5, instead of the sodium salt of a water-soluble graft polymer (1), except for using the bleaching aid shown in Table 3, in the same manner as in Reference Example 5 Bleaching of knitted cotton knit was performed. The texture, whiteness and sewing properties of the bleached cotton knitted knit
Evaluation was performed in the same manner as in Reference Example 5 . Table 3 also shows these results.

[0122] [Comparative Example 5-10] Reference Example 5, instead of the sodium salt of a water-soluble graft polymer (1), except for using the bleaching aid shown in Table 3, in the same manner as in Reference Example 5 And bleached cotton knitted knitted fabric. The texture, whiteness and sewing properties of the bleached cotton knitted knit
Evaluation was performed in the same manner as in Reference Example 5 . Table 3 also shows these results.

[0123]

[Table 3]

Example 5 30 parts of unbleached refiner ground pulp, which is a high-yield pulp, was placed in a beaker having a capacity of 500 ml as an absolute dry weight, and F was added to the unbleached refiner ground pulp.
Water containing 20 ppm each of e ³⁺ , Cu ²⁺ , and Mn ²⁺ was added so that the pulp concentration was finally 14%. Next, while the obtained pulp slurry was stirred at a low speed, 0.06 part (in terms of solid content) of the sodium salt of the water-soluble graft polymer (1) obtained in Example 1 was added to the pulp slurry at 35%. After adding 3.43 parts of aqueous hydrogen peroxide and 0.9 parts of sodium silicate No. 3, the pH of the pulp slurry was adjusted to 1 using sodium hydroxide.
Adjusted to 1.0. Sodium salt of the water-soluble graft polymer (1) to pulp, 35% hydrogen peroxide solution, 3
No. sodium silicate was added in order of 0.2%, 4%
% And 3%.

Subsequently, the pulp slurry was transferred to a predetermined polyethylene bag, and the bag inlet was turned back so that the moisture of the pulp slurry did not evaporate.
The bleaching process was performed by performing a heat treatment in a water bath adjusted to 5 hours for 5 hours. Next, after the bleached pulp slurry was dewatered, the obtained pulp was washed with 1000 parts of ion-exchanged water. Subsequently, a predetermined amount of this pulp was collected and diluted with ion-exchanged water so as to have a concentration of 3%. Then, the obtained pulp slurry was adjusted to pH 4.5 using a sulfurous acid solution. Using the diluted and pH-adjusted pulp slurry, two hand-made sheets were prepared by the TAPPI standard method (tappy standard method), air-dried, and the whiteness was measured by a Hunter whiteness meter. Table 4 shows the results.

[0126] In Example 6-8] Example 5, instead of the sodium salt of a water-soluble graft polymer (1), except for using the bleaching aid shown in Table 4, in the same manner as in Example 5 A hand-made sheet was prepared and its whiteness was measured. Table 4 shows the results.

[0127] In Comparative Example 7-13] In Example 5, instead of the sodium salt of a water-soluble graft polymer (1), except for using the bleaching aid shown in Table 4, in the same manner as in Example 5 A hand-made sheet was prepared and its whiteness was measured. Table 4 shows the results.

[0128]

[Table 4]

From the results shown in Table 1, the bleaching composition containing the bleaching aid according to the present invention was compared with the conventional bleaching composition containing the bleaching aid used in Comparative Examples. It can be seen that useless decomposition of hydrogen can be suppressed. Further, as shown in Table 1, the bleaching composition containing the bleaching aid according to the present invention can suppress the generation of gas generated by the decomposition of hydrogen peroxide and can improve the storage stability as compared with the related art. As shown in Tables 1 and 4, it can be seen that the bleaching properties of fibers and pulp are excellent.

Further, from the results shown in Table 3, the bleaching composition containing the bleaching aid according to the present invention suppressed the rough curing of the feeling of the fiber and the decrease in whiteness and sewing properties, and was excellent. It turns out that it shows bleaching property. From this, it is presumed that the bleaching agent composition containing the bleaching aid according to the present invention has an effect of suppressing scale generation and deposition.

[0131]

Bleach composition according to the first aspect of the present invention exhibits, as above, der bleach composition for bleaching of pulp
(1) Used with bleach containing hydrogen peroxide
A bleaching aid, comprising a monoethylenically unsaturated carboxylic acid
Monoethylenically unsaturated monomer components containing monomers
Water-soluble graft weight obtained by graft polymerization to
A bleaching aid containing coalescing, and (2) hydrogen peroxide as a bleaching agent. As described above, the bleaching composition according to claim 2 of the present invention has a configuration further including a pH adjuster such that the pH of the bleaching composition is in the range of 1 to 7. is there.

According to the above configuration, the water-soluble graft
Polymers can suppress wasteful decomposition of hydrogen peroxide.
Excellent bleaching and storage stability when used with bleach
This has the effect of showing qualitative properties. Further , according to the above configuration, the bleaching composition uses the bleaching aid containing the water-soluble graft polymer as the bleaching aid, thereby storing the bleaching composition containing hydrogen peroxide as the bleaching agent. The effect of providing an inexpensive and safe bleaching composition which is excellent in performance such as stability and bleachability and can be suitably used for pulp bleaching can be provided.

────────────────────────────────────────────────── ⁷ Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // C08F283 / 06 C08F283 / 06 (JP, A) JP-A-7-53993 (JP, A) JP-A-3-177406 (JP, A) JP-A-2-127500 (JP, A) JP-A-2-117999 (JP, A) 63-265998 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C11D 1/00-19/00

Claims (2)

(57) [Claims] 1. A bleaching agent composition for bleaching pulp, which is a bleaching aid used together with a bleaching agent containing hydrogen peroxide.
Contains a monoethylenically unsaturated carboxylic acid monomer
Monoethylenically unsaturated monomer component to polyether compound
Including a water-soluble graft polymer obtained by graft polymerization of
Bleaching characterized by containing a white assistant and hydrogen peroxide as a bleaching agent
Composition. 2. The method of claim 1, further comprising adding a pH adjuster to the bleaching composition.
The pH is included in the range of 1 to 7.
A bleach composition according to claim 1, characterized in that: