JPH01158098A - Acidic rinsing aid - Google Patents

Abstract

PURPOSE: To obtain a stable acidic rinse aid suitable for high concentrated polymer by including a low foam nonionic surfactant, specified (co)polymer, further nonionic surfactant and water.

CONSTITUTION: The aid is prepared by blending (A) a low foam nonionic surfactant, (B) polymer having a weight average molecular weight of 1,000-250,000 and being (i) a homopolymer of (meth)acrylic acid, maleic acid, 2-acrylamido-2- methylpropanesulfonic acid or acrylamide or being (ii) a copolymer consisting of units derived from two or more selected from among (meth)acrylic acid, malice acid, itaconic acid, hydroxyacrylic acid, a 1-4C alkyl (meth)acrylate or amide, 2-acrylamido-2-methylpropanesulfonic acid and styrene, etc., (C) further nonionic surfactant having a cloud point of 70°C and more (e.g. 80°C and more) and (D) water.

COPYRIGHT: (C)1989,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to compositions suitable for use as or in acidic cleaning aids, particularly acidic cleaning aids for dishwashing machines. However, this composition is useful for glass cleaning compositions (e.g., window cleaning compositions), metal cleaning compositions, knitted fabric manufacturing, finishing, and cleaning compositions,
and traps for use as or in water treatment compositions (eg in cooling circuits) would also be suitable.

Background of the invention Rinse aids in commercial and business dishwashers.

and is often used in household dishwashers.

The final rinse with fresh water served to replace the pre-final rinse water and its associated detergent and dirt residues. In large commercial machines, the acid and final rinse water are usually introduced at temperatures above 80°C; the higher temperatures are applied to dishes, glassware (hereinafter collectively referred to as ``substrates'') inside the machine. It is used for disinfection as well as to facilitate rapid flash drying of those surfaces when in use. In some types of "low energy" commercial dishwashers, the acid, final rinse water contains about 50 ppm of a conventional chlorine releasing agent for disinfection. In household dishwashers,
Disinfection is accomplished by efficient batch cleaning through multiple wash and rinse cycles using fresh water.

Rinse aid formulations for dishwashers are conveniently aqueous solutions containing low-foaming nonionic surfactants, approximately 50-100%
It is injected into the fresh final rinse water at a concentration of ppm. Surfactants in the rinse water reduce the surface tension of the rinse water and thus improve the wetting action of the rinse water on hydrophobic substrate surfaces. Improved wetting reduces the tendency of the rinse water to form water droplets containing dissolved solids on the substrate that remain as spots when dry. Therefore, the action of the surfactant in the cutting aid can effectively reduce the surface tension during drainage and avoid the traces of bubbles on the cutting substrate, which will result in residue during evaporation. , has low foaming properties.

In a commercial dishwasher, the acid, final rinse water is used to rinse the substrate and then mixed with the circulating pre-final rinse water. The rinse water may be fed back into the wash water,
Or it may be used as is as wash water for the next cycle. Finally, when rinse aids are included, surfactants and other additives should be selected based on their effect in the wash bath as well as in the rinse water. Therefore, an important aspect of rinse aids is their ability to defoam food soils in alkaline ash baths. Proteinaceous food soils are particularly prone to foaming in agitated alkaline cleaning baths. Foams in the cleaning spray (more specifically acids, trapped air) reduce the mechanical efficiency of the spray and prevent maximum dirt removal. Many low-foaming surfactants are effective soil defoamer agents. However, other additives interfere with soil defoaming.

Although low-foaming surfactants have improved the wetting of rinse water to the substrate, they have not completely eliminated the problem of spotting and streaking. It is known that rinsing and hydraulic addition of pre-carboxylated polymers such as polyacrylic acid can further reduce spotting, filming and streaking. It is believed that these water-soluble polymers can be adsorbed onto slightly soiled substrates to make the surface more hydrophilic.

More hydrophilic surfaces can be wetted more easily by surfactant-containing rinse water.

Polycarboxylated polymers are particularly effective because they do not contribute to foam generation and do not interfere with the soil defoaming activity of low-foaming surfactants. Such polycarboxylated polymeric acids also have the advantage of helping to prevent precipitation of acid, hardness ionic salts when used in hard water.

However, significant obstacles exist to the use of polycarboxylated polymers in rinse aids. This failure is due to the incompatibility of these polymers in aqueous formulations containing low-foaming surfactants. Combining such polymers and surfactants in water results in phase separation. Upon standing for a short period of time, the water containing these polymers and surfactants forms two or more layers of different composition. This phase separation is clearly unacceptable. This is because such formulations, when introduced into the machine, result in non-uniform addition of a given component. For example, the formulation may contain too little surfactant to provide sufficient wetting, or it may contain too much surfactant to generate excessive foam.

Hydrotropes such as sodium xylene sulfonate, sodium cumene sulfonate and short chain alkyl sulfates have been used to enable formulation of low foaming nonionic surfactants into stable aqueous concentrates. C For example,
U8F 3.563.901 and [r8F 4,44
3.270). However, these hydrotropes have little effect on compatibilizing low foaming surfactants with polycarboxylated polymers in aqueous concentrates. Furthermore, even when hydrotropes provide limited compatibility, they suffer from the major drawback of interfering with the food soil defoaming activity of surfactants.

It has also been proposed to use water-miscible solvents such as isozolopanol and zoropylene glycol and hydrogen bond-breaking components such as urea in the formulation of rinse aids containing low-foaming nonionic surfactants. However, they have been found to have little or no effect on compatibilizing polycarboxylated polymers with low-foaming surfactants. Although the combination of hydrotropes with such solvents provides some improvement over either compound alone, the combination also
This results in a one-coat adjuvant with limited compatibility and adversely affects food soil defoaming activity.

Low molecular weight polyelectrolytes have been combined with low foaming surfactants in powder detergent formulations. σSF4.203.
858, an acid, an alkali metal salt or ammonium salt of carbonate (e.g., sodium carbonate), and a molecular weight of about 500 to 4
．． A low-foaming, phthalate-free dishwashing composition is disclosed comprising a water-bath salt of a polyelectrolyte of 0.000 and optionally an anti-foaming nonionic surfactant of up to IC1.

The ratio of polyelectrolyte to carbonate is between 5:95 and 20:8.
Ranges to 0. Representative examples of polyelectrolytes are polymers of acrylic acid, methacrylic acid, maleic acid, and itaconic acid. Acrylic and methacrylic acid homopolymers and copolymers having a molecular weight in the range of 504 to 1291 are preferred. 08F 4,203.858, the main differences between this composition and conventional polyelectrolyte-built dishwashing compositions are the lower concentration of polyelectrolytes and the inferior metal ion content of these polyelectrolytes. It is disclosed that it has a blockade ability.

Additional materials disclosing (meth)acrylic eR polymers and their salts in detergent and cleaning applications are available at ffAP
3.671.440 ; 3.853.981 : 3.9
50.260; 3.933.673; 3.922.
230; and 4.521.332. However, nowhere in these documents does the solution of polyelectrolytes using low-foaming surfactants in rinse aid concentrates be addressed or presented.

The nature of the rinse aid required depends on the hardness of the water used in the dishwasher. In the case of soft water with a low level of hardness, e.g. less than about 10, the rinse aid typically has a hardness of 7 or higher (referred to herein as an alkaline rinse aid). hardness, e.g. about 6
In the case of hard water having a French hardness of 0 or higher, acid rinse aids typically have a - of less than 7 (referred to herein as acids, acid rinse aids). The problem of making acidic, low-foaming nonionic surfactants compatible with polycarboxylated polymers in the case of alkaline rinse aids has been overcome.

methacrylic acid and one or more C1-06 alkyl Cmeth)
acrylate, wherein at least 5 of the acid groups in the copolymer are
A stable alkaline stitching aid is produced by using a polymer that is 0% neutralized with alkali as a compatibilizer or stabilizer (applicant's zp-A-024
See '5987.

However, such polymeric dense copolymers are unsuitable for compatibilizing low-foaming nonionic surfactants and polycarboxylated polymers in acidic rinse aid formulations, and phase separation may occur. Do you get it.

SUMMARY OF THE INVENTION The inventors have unexpectedly discovered that low foaming nonionic surfactants can be made compatible with polycarboxylated polymers by using additional nonionic surfactants. It has been found that a stable acidic rinse aid can be produced.

According to the present invention, (1) low foaming nonionic surfactant: C11) has a weight average molecular ti, ooo ~ 250.000, and has acrylic acid, methacrylic acid, maleic acid, 2-acrylaminated A homopolymer of p-2-methylpropanesulfonic acid or acrylamide V, or acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, itaconic acid, hydroxyl acrylic acid%'lS-'4 Alkyl (meth)
Acrylates or amyl acids such as ethyl acrylate, 2-acrylamido-2-methylpropanesulfonic acid (AMP8), styrene, acrylamide, isobutadiene, zomethylakinoethyl methacrylate (DMAF)
liMA), and t-butylacrylamide (t-R
A polymer that is a copolymer consisting of units derived from two or more of AM) (hereinafter referred to as "r-superposition product" for convenience): (iii) Chain point of 70°C or higher C, for example, 80°C or higher ) an additional nonionic surfactant: and (1v) water, a stable composition suitable for use as or in an acidic rinse aid is provided.

The present invention also uses a low-foaming nonionic surfactant (which has a chain point below 70°C due to its low-foaming requirement) and a deuteran average molecular weight of 1.000 to 250.
000, and is a homopolymer of acrylic acid, methacrylic acid, maleic #112-acrylamide V-2-methylpropanesulfonic acid, or acrylamide, or acrylic acid, methacrylic acid, ethacrylic acid, maleic acid , Itacone, Hydroxyacrylic acid, C1-0
4-alkyl C methacrylates or amides such as ethyl acrylate, 2-acrylamido-2-methylpropanesulfonic acid (AMP8), styrene, acrylamide ρ, isobutadiene, dimethylaminoethyl methacrylate (DMAHMA), and t-butylacrylamide (t- A method for stabilizing an aqueous composition comprising a copolymer comprising units derived from two or more of 7.
The method comprises incorporating a nonionic surfactant having a chain point above 0°C.

DETAILS OF THE INVENTION Figure 1 shows two formulations of the rinse aid of the present invention (1 is formulation 8 of Table 2 below; 1 is formulation 4 of Table 2 below).
) and conventional formulation C111 exhibit the light transmittance when mixed in soft water, medium hard water, and hard water as described in Example 1 below. High light transmittance correlates with high ability to inhibit precipitation of hardness-ion salts.

Unless otherwise specified herein, all amounts expressed by weight for low foaming nonionic surfactant, polymer, and additional 710 nonionic surfactant refer to low foaming nonionic surfactant, polymer, and additional 710 nonionic surfactant. The amount is per 100 parts of foaming nonionic surfactant and 10 parts of additional nonionic surfactant.

The low-foaming nonionic surfactant acid may comprise any known low-foaming nonionic surfactant useful in machine dishwashing or cutting aid applications, for example. Suitable low-foaming nonionic surfactants include 06-022 fatty alcohol/ethyleneoxy condensates, polyoxypropylene-polyoxyethylene condensates, alkylpolyoxypropylene-polyoxyethylene condensates, alkylpolyoxy Ethylene-polyoxypropylene condensates, polyoxyalkylene glycols, benzyl ethers of polyoxyethylene condensates of alkylphenols, and butyleneoxy r-capped alcohol condensates, such as formula %) c, where R is 08 ''-a1e is an alkyl group, y
has an average value of 6.5 to 10, and X has an average value of 0.5
~1.5. Typical commercially available low foaming nonionic surfactant acids,
Triton 0F-IQ (alkylaryl polyether) and Triton DR-1 manufactured by Rohm and Haas
6 (Modified polyoxyalkylated alcohol) S BAE
Pluronic T manufactured by IF, -62C polyoxyethylene-polyoxypropylene block copolymer), Ruchimple L1'403, and Ruchimple L F 404;
and Antalox BI, -3 manufactured by GASP.
30 (modified linear aliphatic alcohol polyethoxylated chloro-terminated compound).

The compositions of the invention contain, for example, at least 1 part by weight, preferably at least 5 parts by weight, more preferably less than
Both have 10 parts by weight of low foaming nonionic surfactant. An acid, eg, up to 60 parts by weight, preferably up to 40 parts by weight, of a low foaming nonionic surfactant is present in the composition.

In one embodiment of the present invention, the acid or polymer is a homopolymer of acrylic acid, methacrylic acid, or maleic acid, or
or acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, itaconic acid, hydroxyacrylic acid, 02-C4
It is a copolymer formed from two or more of alkyl (meth)acrylate or amide and 2-acrylamido-2-methylpropanesulfonic acid.

The polymers used in the compositions of the invention may be polysoxylated polymers.

The weight average molecular weight of the polymer is at least 1.000 and preferably up to 100.000, more preferably up to 70.000. The polymers may be used in the free acid form when preparing the non-exploitable compositions, or in the form of partially or fully neutralized, e.g. alkali gold maple or ammonium salts. The acid may be preferably used in partially neutralized form. This is because there is no need to carry out later adjustable steps to achieve the desired acidity.

A suitable commercially available polymer is Acrysol IJMW.
45 (20% neutralized, ″Xt average molecular weight 450
0 acrylic acid homopolymer, Acrysol LMW 45
N (completely neutralized, heavy average molecular weight 4500
acrylic acid homopolymer).

The compositions of the invention contain, for example, at least 0.5 part by weight of polymer, preferably at least 1 part by weight of acid. Up to 20 parts by weight of polymer may be present in the composition, preferably up to 10 parts by weight, more preferably up to 5 parts by weight.

A suitable nonionic cosurfactant (cosurfa-
ctant) is an alkylaryl polyether alcohol having an average of at least 10 ethylene oxide units per molecule, an alkyl polyether alcohol having an average of at least 10 ethylene oxide units per molecule, and the like. Preferably, the acidic cosurfactant is the reaction product of ethylene oxide and octyl or nonylphenol, such as a compound having the following formula:
or, provided that X is small (both have an average value of 10).

A suitable commercially available material acid having formula (I), Triton X-165 (average value of X = 16); Triton X-
305 (average value of χ = 30): ) Ridone X-40
5 (average value of X = 4[]); and] trito: /X-7
05-70% xo) -302 (average value of x = 30);) Lido 7N-4
Average value of Q1Cx = 40):) Lido 71i9°9B-7
0% (mean value of X = 100): and Triton N998
-100% (xo) average value -100); all of these materials are manufactured by Rohm and Haas.

The compositions of the invention contain, for example, at least 0.1 m parts by weight of a nonionic co-surfactant, preferably at least 0.5 parts by weight. For example, up to 100 ml of nonionic cosurfactant may be present in the composition, preferably up to 5 ml.

The composition of the present invention comprises a low foaming nonionic cosurfactant;
It should be understood that it may consist of one or more of each of a polymer and a nonionic surfactant. In one embodiment of the present invention, an acid, a low-foaming nonionic surfactant, a polymer, a nonionic cosurfactant, and water? ! The amount is 100% by weight of the composition.

The compositions of the present invention may contain other additives, such as sequestering agents such as nitrile triacetate [1 (NTA), ethylenecyaminetetraacetic acid (KDTA), phosphonates, chlorides, and sodium citrate]. ] and water-miscible solvents (such as isopropanol and zoropylene glycol)
It may contain one or more of the following. Examples of suitable phosphonates are 1-hydroxyethylene-bis-phosphonic acid, nitrile-tris (methylenephosphonic acid), ethylenediaminetetra(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), and hexamethylenediaminetetra(methylenephosphonic acid) A suitable commercially available phosphonate acid, Dequest-2006, -20, manufactured by Monsanto.
16, -2046, -2056, and -2066, and Micron-P 060, P 110, P 20 manufactured by Warwick International.
0. P 310, P 400, and the like. For example, on a total basis for the composition, KDTA is 2ffi.
&% (, NTA may be present in an amount up to 4% by weight (, < citric acid may be present in an amount up to 10% by weight (, or The phosphonate may be present in amounts up to twofold. If more than 18% of such sequestering additive is present, it may be necessary to appropriately adjust the amount of such additive present. The acidic materials useful as optional additives can be used in cough form, partially neutralized form, or fully neutralized form.

Although specific examples of formulations are shown in Table Ig1, the numbers indicated for each ingredient are weights of the total weight of the formulation, and the remainder is water.

Acids at 40° C. for several weeks and at room temperature at least 90° C.
It has been found that it is possible to produce compositions of the invention that are stable for days and survive five freeze/thaw cycles. Without wishing to be limited by theory, it is believed that this stability is due to the creation of a microemulsion by the addition of nonionic cosurfactants. Two observations support the formation of microemulsions. First, in the absence of a nonionic cosurfactant acid, the composition is cloudy;
The composition rapidly separates into two or more phases, but when a nonionic cosurfactant is added, the composition becomes transparent. This transparency is believed to be due to the creation of a microemulsion with particle sizes too small to cause light scattering. Second, when the nonionic cosurfactant is added, a stable dispersion is produced instantly, ie, without input of mechanical energy (eg, without stirring). It is known that in oil/surfactant/water systems where no homogeneous phase is formed, by the addition of acids, co-surfactants it is possible to instantaneously form stable dispersions due to the formation of microemulsions, and It is believed that a similar situation occurs with the compositions of the present invention.

When used as or in a tearing aid (e.g., a rinse aid for an automatic dishwasher), the compositions of the invention can promote wetting of the substrate and improve the quality of the substrate when subsequently dried. can reduce spotting. These properties of the composition also make it suitable for other uses, such as for use as or in glass (eg window cleaning or metal cleaning compositions).

The present invention will be further explained with reference to examples and drawings.
The examples are for illustrative purposes and are not intended to limit the scope of the invention.

Example 1 This example illustrates the need to use nonionic cosurfactants to stabilize aqueous compositions consisting of low foaming nonionic surfactants and polymers. Contains a low-foaming nonionic surfactant, a polymer, and water,
A number of compositions have been prepared in which some compositions additionally contain nonionic cosurfactants. Of these compositions,
The stability against phase separation at 40° C. for 24 hours (or more) was measured and the results are shown in Table 2.

Table 2 Compounds 1 2345678 (Ingredients) (Part) Polymer (appetizer) 5522221010 Nonionic surfactant (old →) 01030404 Water 85 84 68 65 48
44 70 66 Stability For example, Triton DF-12 < 5 (Modified polyalkoxylated alcohol) For example, Acrydel T, +MW45 (Acrylic acid homopolymer - 20% neutralized - I Molecular weight 4500 > +**% oleic acid, Triton X-305 (octylphenol ethoxylatene with an average of 30 ethyleneoxy F units per molecule).

From Table 2 it can be seen that formulation C according to the invention, namely formulation 2.
4.6, and 8) were stable, whereas comparative compositions containing no nonionic cosurfactant (i.e., formulations 1.3.5, and 7) were not stable. can be easily recognized.

As previously mentioned, the presence of polymers (e.g., polycarboxylated polymers) in acidic rinse aids prevents the precipitation of hardness ionic salts from the water where the rinse aid is used. This is beneficial because it is inhibited by polymers. However, conventional rinse aids are entirely composed of polymers. ! They have the disadvantage that they can only be used in very small amounts, otherwise phase separation of the low-foaming nonionic surfactant and the polymer will occur in the cutting aid.

The presence of the co-surfactant used in the present invention allows a greater concentration of polymer to be present in the rinse aid, thus combining the polymer and the low-foaming nonionic surfactant 9.
Increases the efficiency of inhibiting precipitation of hardness ionic salts from water using a five-ring aid without causing phase separation. That is, a composition containing a cosurfactant acid, a low-foaming nonionic surfactant, and a polymer that is stable enough to have a higher concentration of polymer than could be used in the composition. This allows for compositions to be produced.

The ability of nonionic cosurfactants to make it possible to produce stable aqueous compositions containing low foaming nonionic surfactants and polymers (e.g. polycarboxylated polymers);
The light transmittance of formulations 4 and 8 of Table 2 (ie, formulations of the invention) was assayed by comparing it with that of a conventional formulation containing no nonionic cosurfactant. The conventional formulation contains 30% by weight of a low-foaming nonionic surfactant and 10% isopropanol. t% and 60 overlapping parts of water. Light transmittance can be used as an indicator of whether precipitation of formulation-entrapment hardened ionic salts occurs. This is because such precipitation reduces light transmittance.

The light transmittance of each of these six formulations was measured by adding them to acid, soft water, medium hard water, and hard water. The results are shown in the graphs of the accompanying drawings.

The X-axis is water hardness, with A representing soft water, B representing medium hard water, and C representing hard water. The y-axis represents the original transmittance.6(1) is! C11) is the curve obtained for formulation 8 of Table 2; C11) is the curve obtained for formulation 4 of Table 2; and riii) is the curve obtained for the conventional formulation.

From the graph it can be seen that the formulations of the invention [curves (i) and (11
)] has substantially higher light transmission, i.e., greater hardness ion salt precipitation inhibition, than the conventional formulation [represented by curve (iii >)] in medium and hard water. .

The suppression of hardness ionic salt precipitation wrinkling exhibited by the compositions of the present invention is greater than that of conventional compositions, and according to the present invention stable compositions having a higher degree of polymerization than can be used in conventional compositions. It can contribute to the ability to create things.

Curves (1) and (n) in the attached graphs show that the higher the concentration of polymer in the acid rinse aid, the greater the inhibition of hardness ion salt precipitation (particularly in medium and hard waters), therefore , the light transmittance increases: Song M (1) is 10
curve (11) represents a formulation containing 2 parts by weight of polymer.

Example 2 This example demonstrates two procedures for making the compositions of the present invention.

Procedure A Polymer was added to water, then low foaming nonionic surfactant, and finally nonionic cosurfactant.

The low foaming nonionic surfactant was added to 1 L of water, then the polymer was added, and finally the cosurfactant was added.

A number of formulations of the invention were prepared using the above procedure and their stability at 40° C. for 24 hours (C or more) was determined.

The results are shown in Table W.3.

Third surface water 75 75 75 75
75 75 stable note Yes Yes Yes
Yes Yes Yes Tatami = Triton
DF-16 tatami cost = Triton X-60
5 The total amount of each formulation was 100 parts by weight. From Table 6, Triton DF is used as a low foaming nonionic surfactant.
-160, it is recognized that either Procedure A or Procedure B can be used to produce stable compositions according to the invention. Table 3 also shows that stable compositions are produced despite variations in the polycarboxylated polymer.

However, in some cases the order of addition of the acids, eg, when alkoxy polyethoxy polyproboxybenzyl ether is used as the low-foaming nonionic surfactant, the components of the composition is important. Table 4 shows step A above.
and B1 and the stability of the compositions of the invention prepared using two additional applications 0 and D. Procedure C is the addition of the polymer to the water followed by the addition of the nonionic cosurfactant and finally the addition of the low foaming nonionic surfactant; After adding the auxiliary surfactant, the low foaming nonionic surfactant is added, and finally the polymer 7kfj& is added. In each of these compositions, the low foaming nonionic surfactant was an alkoxybolyethoxypolyzolopoxybenzole ether.

Table 4 Formulations 15 16 17 18 Procedures
A B OD Stability Unstable Unstable Unstable Unstable This example illustrates that the procedure for making the formulations of the present invention varies depending on the chemical structure of the low-foaming nonionic surfactant. The terms "Triton" and "Acrisol" are trademarks of Rohm and Haas.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the light transmittance of formulations of the rinse aid of the present invention as well as conventional formulations when mixed with soft water, medium hardness water, and hard water.

Claims (27)

[Claims] (1) (i) Low foaming nonionic surfactant; (ii)
It has a weight average molecular weight of 1,000 to 250,000 and is a homopolymer of acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, or acrylamide, or acrylic acid, methacrylic acid , ethacrylic acid, maleic acid, itaconic acid,
2 of hydroxyl acrylic acid, C_1-C_4 alkyl (meth)acrylate or amide, 2-acrylamido-2-methylpropanesulfonic acid, styrene, acrylamide, isobutadiene, dimethylaminoethyl methacrylate, and t-butylacrylamide
(iii) an additional nonionic surfactant having a cloud point of 70°C or higher (e.g., 80°C or higher); and (iv) water. A stable composition suitable for use as or in an acidic rinse aid comprising: (2) Polymer (ii) is a homopolymer of acrylic acid, methacrylic acid, or maleic acid, or acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, itaconic acid,
Claim 1, which is a copolymer produced from two or more of hydroxyacrylic acid, C_2-C_4 alkyl (meth)acrylate or amide, and 2-acrylamido-2-methylpropanesulfonic acid. Composition of. (3) The composition according to claim 1, wherein the polymer (ii) is a polycarboxylated polymer. (4) Low foaming nonionic surfactant (i) is C_6~
C_2_2 fatty alcohol/ethylene oxide condensate,
One of polyoxypropylene-polyoxyethylene condensates, alkylpolyoxypropylene-polyoxypropylene condensates, polyoxyalkylene glycols, benzyl ethers of polyoxyethylene condensates of alkylphenols, and butylene oxide cap alcohol condensates The composition according to claim 1, comprising the above composition. (5) The butylene oxide capped alcohol condensate has the formula R(OC_2H_4)_y(OC_4H_8)_xOH
(In the formula, R is a C_8 to C_1_8 alkyl group, and y
has a mean value of 3.5 to 10, and x has a mean value of 0.5
1.5). (6) The low foaming nonionic surfactant (i) is
2. The composition of claim 1, wherein the composition is present in an amount of at least 1 part by weight per 100 parts by weight of +(ii) +(iii) + (iv). (7) The low foaming nonionic surfactant (i) is
2. A composition according to claim 1, wherein the composition is present in an amount of at least 5 parts by weight per 100 parts by weight of + (ii) + (iii) + (iv). (8) The low foaming nonionic surfactant (i) is
2. A composition according to claim 1, wherein the composition is present in an amount of at least 10 parts by weight per 100 parts by weight of +(ii) +(iii) + (iv). (9) The low foaming nonionic surfactant (i) is
7. The composition of claim 6, wherein the composition is present in an amount of up to 60 parts by weight per 100 parts by weight of +(ii) +(iii) +(iv). (10) The low foaming nonionic surfactant (i) is
8. The composition of claim 7, wherein the composition is present in an amount of up to 50 parts by weight per 100 parts by weight of )+(ii)+(iii)+(iv). (11) The low foaming nonionic surfactant (i) is (i
9. The composition of claim 8, wherein the composition is present in an amount of up to 40 parts by weight per 100 parts by weight of )+(ii)+(iii)+(iv). (12) Polymer (ii) has a weight average molecular weight of 100,00
The composition according to claim 1, having a molecular weight of 0 or less (preferably 70,000 or less). (13) The composition according to claim 1, wherein the polymer (ii) is partially neutralized. (14) Polymer (ii) is (i) + (ii) + (ii
per 100 parts by weight of i)+(iv) at least 0.
A composition according to claim 1, wherein the composition is present in an amount of 5 parts by weight. (15) Polymer (ii) is (i) + (ii) + (ii
A composition according to claim 1, wherein the composition is present in an amount of at least 1 part by weight per 100 parts by weight of i)+(iv). (16) Polymer (ii) is (i) + (ii) + (ii
15. The composition of claim 14, wherein the composition is present in an amount of up to 20 parts by weight per 100 parts by weight of i)+(iv). (17) Polymer (ii) is (i) + (ii) + (ii
16. A composition according to claim 15, wherein the composition is present in an amount of up to 10 parts by weight per 100 parts by weight of i)+(iv). (18) Polymer (ii) is (i) + (ii) + (ii
16. A composition according to claim 15, present in an amount of up to 5 parts by weight per 100 parts by weight of i)+(iv). (19) The additional nonionic surfactant (iii) is from an alkylaryl polyether alcohol having an average of at least 10 ethylene oxide units per molecule, or an alkyl polyether alcohol having an average of at least 10 ethylene oxide units per molecule. The composition according to claim 1. (20) Alkylaryl polyether alcohol has the formula ▲ has a mathematical formula, chemical formula, table, etc. ▼ (I) or ▲ has a mathematical formula, chemical formula, table, etc. ▼ (II) (where x has an average value of at least 10) 20. The composition according to claim 19, comprising a compound of: (21) The additional nonionic surfactant (iii) is (
A composition according to claim 1, wherein the composition is present in an amount of at least 0.1 parts by weight per 100 parts by weight of i) + (ii) + (iii) + (iv). (22) The additional nonionic surfactant (iii) is (
A composition according to claim 1, wherein the composition is present in an amount of at least 0.5 parts by weight per 100 parts by weight of i) + (ii) + (iii) + (iv). (23) The additional nonionic surfactant (iii) is (
21. The composition of claim 20, present in an amount of up to 10 parts by weight per 100 parts by weight of i)+(ii)+(iii)+(iv). (24) The additional nonionic surfactant (iii) is (
22. The composition of claim 21, wherein the composition is present in an amount of up to 5 parts by weight per 100 parts by weight of i) + (ii) + (iii) + (iv). (25) A low foaming nonionic surfactant having a weight average molecular weight of 1,000 to 250,000, and containing acrylic acid, methacrylic acid, maleic acid, 2-acrylamide-
A homopolymer of 2-methylpropanesulfonic acid or acrylamide, or acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, itaconic acid, hydroxyacrylic acid, C_2-C_4 alkyl (meth)acrylate or amide, 2-acrylamide - an aqueous composition having a mixture with a copolymer consisting of units derived from two or more of 2-methylpropanesulfonic acid, styrene, acrylamide, isobutadiene, dimethylaminoethyl methacrylate, and t-butylacrylamide. A stabilizing method, comprising further incorporating into the composition a nonionic surfactant having a cloud point of 70° C. or higher. (26) a low foaming nonionic surfactant, a polymer, and an additional nonionic surfactant, and the amounts thereof are as defined in claim 2. ,
The method according to claim 25. (27) 70°C or higher (e.g. , 80° C. or higher).