JP4042873B2 - Deinking agent composition - Google Patents

Description

【００３７】
（試験１）
オフセット新聞古紙５０％、凸版印刷古紙２０％、チラシ古紙３０％からなる原料古紙６０ｇを３ｃｍ角に切断してパルプ離解機に入れ、１，５００ミリリットルの水道水を入れた後、古紙重量に対して水酸化ナトリウム１．３％、３号ケイソー３．２％、３５％過酸化水素１．１％、実施例１〜５又は比較例１〜３の各脱墨剤組成物０．３％を加え、パルプ濃度４．０％にて２５分間離解を行なった。次いで、５０℃にて１時間熟成を行なった。その後パルプ濃度を１．０％に希釈して２５℃にて１０分間フローテーション処理を行なった。得られたパルプをＴＡＰＰＩスタンダード型抄紙機にて坪量１００ｇ／ｍ^２のパルプシートを得た。
得られたシートのハンター白色度、Ｌ値、ｂ値をΣ８０（日本電色工業製）にて測定した。
又、残インキ個数は得られたパルプシートを画像解析装置（ピアスＬＡ−５００）を用いて測定した。
フロス量はフローテーション１０分間にかき出された量を測定した。
泡切れ時間は、フローテーション開始後１分間後のフロスを１００ミリリットルメスシリンダーに１００ミリリットル採取し、泡の消失時間を測定した。
測定結果を以下の表に示す。
【００３８】
【表２】

【００３９】
（試験２）
コンピューターアウトプット古紙（ＣＰＯ）とコピー古紙（ＰＰＣ）からなる原料古紙（混合比１／１）６０ｇを３ｃｍ角に切断してパルプ離解機に入れ、１．５００ミリリットルの水道水を入れた後、古紙重量に対して水酸化ナトリウム１．３％、実施例１〜５又は比較例１〜３の各脱墨剤組成物０．３％を加え、パルプ濃度４．０％にて２５分間離解を行なった。次いで、５０℃にて１時間熟成を行なった。その後パルプ濃度を１．０％に希釈して２５℃にて５分間洗浄試験を行った。得られたパルプをＴＡＰＰＩスタンダード型抄紙機にて坪量１００ｇ／ｍ^２のパルプシートを得た。
得られたシートのハンター白色度、Ｌ値及び残インキ個数を試験１と同様の方法で測定した。
測定結果を以下の表に示す。
【００４０】
【表３】

【００４１】
【発明の効果】
本発明の効果は、高ハンター白色度、高Ｌ値、高ｂ値の製品紙が得られ、又脱墨工程中の抑泡効果に優れる脱墨剤組成物を提供したことにある。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deinking agent composition used for recycling used paper.
[0002]
[Prior art]
Recycling of used paper for renewing newspapers and magazines to create new paper is a technique that has been used for a long time. However, in recent years, the effective use of waste paper has become increasingly important from the viewpoints of shortage of pulp resources and soaring prices, lack of trees as raw materials, environmental protection, and the like. On the other hand, the use of deinked pulp has often been newspaper and magazine paper, but in recent years there has been a strong demand for high whiteness reproduction in order to develop various uses. Under such circumstances, demands for improving the performance of deinking agents that play an important role in the deinking process are becoming stricter year by year.
[0003]
A polyalkylene glycol diether analog is used as a base material for the deinking agent. For example, JP-A-1-266292 discloses a method for deinking waste paper using a deinking agent containing polyethylene glycol diether or polyethylene glycol diether and polyethylene glycol monoether as active ingredients. Specifically, polyethylene glycol dibutyl ether, polyethylene glycol hexyl methyl ether, polyethylene glycol 2-ethylhexyl methyl ether, polyethylene glycol 2-ethylhexyl butyl ether, polyethylene glycol lauryl methyl ether, and the like are used. Japanese Patent Application Laid-Open No. 5-125682 discloses a deinking agent composition in which an ethylene oxide adduct of monoglyceride is blended with the above polyethylene glycol diether.
[0004]
JP-A-4-136288 discloses a polyalkylene glycol diether, specifically, a C ₁₂ -C ₁₅ synthetic alcohol with a C ₁₆ -C ₁₈ α-olefin oxide, propylene oxide and ethylene oxide randomly. Copolymerized deinking agents are disclosed.
[0005]
[Problems to be solved by the invention]
However, polyalkylene glycol derivative-based deinking agents represented by these, although showing a certain effect when high whiteness is not required, such as newspaper / magazine recycled paper based on newspaper / magazine used paper, It was difficult in terms of performance to produce recycled paper with higher whiteness by blending old OA paper with OA waste paper.
Accordingly, an object of the present invention is to provide a deinking agent composition that can provide product paper having high whiteness, high L value, and high b value, and is excellent in the defoaming effect during the deinking process.
[0006]
[Means for Solving the Problems]
Therefore, the present inventors have intensively studied and developed a deinking agent composition capable of obtaining recycled paper with high whiteness, residual ink and low residual carbon, which can be used as OA paper as well as newspaper / magazine paper. It came to do.
That is, the present invention provides the following general formula (1) as the component (A).
R ¹ —O— (AO ¹ ) _m —R ² (1)
(In the formula, R ¹ and R ² represent a hydrocarbon group, AO ¹ represents an oxyalkylene group, and m represents a number of 1 or more.)
A polyalkylene glycol diether represented by :
As the component ( B), the following general formula (2)
R ³ —O— (AO ² ) _n —H (2)
[Wherein, R ³ represents a hydrocarbon group, (AO ² ) _n represents a polyoxyalkylene chain composed of two or more oxyalkylene groups, and n represents a number of 2 or more. ]
A polyalkylene glycol monoether represented by:
And as (C) component, following general formula (3)
R ⁴ —O— (C ₃ H ₆ O) _p —R ⁵ (3)
(In the formula, R ⁴ and R ⁵ represent a hydrocarbon group, and p represents a number of 1 or more.)
A deinking agent composition comprising a polypropylene glycol diether represented by the formula:
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The component (A) of the deinking agent composition of the present invention is a polyalkylene glycol diether represented by the general formula (1). In the general formula (1), R ¹ and R ² are hydrocarbon groups. Examples of the hydrocarbon group include an alkyl group, an alkenyl group, an aryl group, a cycloalkyl group, and a cycloalkenyl group.
[0008]
Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, tertiary butyl, pentyl, isopentyl, secondary pentyl, neopentyl, tertiary pentyl, hexyl, secondary hexyl, heptyl, secondary Heptyl, octyl, 2-ethylhexyl, secondary octyl, nonyl, secondary nonyl, decyl, secondary decyl, undecyl, secondary undecyl, dodecyl, secondary dodecyl, tridecyl, isotridecyl, secondary tridecyl, tetradecyl, secondary tetradecyl, Hexadecyl, secondary hexadecyl, stearyl, icosyl, docosyl, tetracosyl, triacontyl, 2-butyloctyl, 2-butyldecyl, 2-hexyloctyl, 2-hexyldecyl, 2-octyldecyl, 2-hexyldecyl, 2 Octyldodecyl, 2-decyltetradecyl, 2-dodecyl-hexadecyl, 2-hexadecyl octadecyl, 2-tetradecyl-octadecyl, monomethyl branched - include isostearyl.
[0009]
Examples of the alkenyl group include vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl, oleyl and the like.
[0010]
Examples of the aryl group include phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonyl Examples include phenyl, decylphenyl, undecylphenyl, dodecylphenyl, phenylphenyl, benzylphenyl, styrenated phenyl, p-cumylphenyl, α-naphthyl, β-naphthyl group and the like.
[0011]
Examples of the cycloalkyl group and cycloalkenyl group include cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclopentenyl, methylcyclohexenyl, methylcycloheptenyl group, and the like. Is mentioned.
[0012]
Among these, in order to obtain recycled paper with high whiteness, R ¹ is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group or alkenyl group having 1 to 18 carbon atoms. R ² is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group or alkenyl group having 1 to 12 carbon atoms.
[0013]
AO ¹ is an oxyalkylene group. Examples of the oxyalkylene group include oxyethylene, oxypropylene, oxybutylene, oxyhexylene, oxyoctylene and the like. Among these, an oxyalkylene group having 2 to 4 carbon atoms is preferable, and an oxyethylene group is most preferable. When AO ¹ is two or more kinds of oxyalkylene groups, one kind is preferably an oxyethylene group. The (AO ¹ ) _m portion can be formed by addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, α-olefin oxide, and the like. In addition, when the part of (AO ¹ ) _m is two or more kinds of oxyalkylene groups, the polymerization form such as oxide to be copolymerized is not particularly limited, and may be random copolymer, block copolymer or random / block copolymer. It may be. Although the degree of polymerization m is a number of 1 or more, in order to obtain recycled paper with high whiteness, when either R ¹ or R ² is a hydrocarbon group having 4 or more carbon atoms, 1 to 200 is Preferably, 1-100 are more preferable, and 3-50 are the most preferable. When both R ¹ and R ² are hydrocarbon groups having 3 or less carbon atoms, m is preferably 1 to 1,000, more preferably 5 to 750, and most preferably 10 to 500.
[0014]
The production method of the polyalkylene glycol diether represented by the general formula (1) is not particularly limited, and may be an ordinary known method. Usually, after addition polymerization of an alkylene oxide to an alcohol or phenol composed of R ¹ —OH in the presence of an alkali catalyst, the terminal hydrogen atom is replaced with a hydrocarbon group with an alkylating agent such as alkyl chloride. it can.
[0015]
(B) of the deinking agent composition of the present invention is a polyalkylene glycol monoether represented by the general formula (2). In the general formula (2), R ³ is a hydrocarbon group. Among these, R ³ is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group or alkenyl group having 6 to 28 carbon atoms.
[0016]
In the general formula (2), (AO ² ) _n represents a polyoxyalkylene chain composed of two or more oxyalkylene groups. Examples of the oxyalkylene group include oxyethylene, oxypropylene, oxybutylene, oxyhexylene, oxyoctylene, α-olefin oxide and the like. Especially, a C2-C4 oxyalkylene group is preferable and it is preferable that 1 type is an oxyethylene group among 2 or more types of oxyalkylene groups. (AO ² ) _n is a polyoxyalkylene chain composed of two or more of these oxyalkylene groups, and is formed by copolymerizing alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, and the like. be able to. The form of polymerization such as oxide to be copolymerized is not particularly limited, and may be random copolymerization, block copolymerization, random / block copolymerization, or the like, but is preferably a group constituted by random copolymerization. The degree of polymerization n is a number of 2 or more, preferably 2 to 200, more preferably 2 to 150, and most preferably 10 to 100.
[0017]
The production method of the polyalkylene glycol monoether represented by the general formula (2) is not particularly limited, and may be an ordinary known method. Usually, it can be obtained by random copolymerization or block copolymerization of two or more alkylene oxides with an alcohol or phenol comprising R ³ —OH in the presence of an alkali catalyst.
[0018]
The mixing ratio of the component (A) and the component (B) is not particularly limited, but when considering the whiteness of the recycled paper and the defoaming effect during the deinking process, the weight ratio (A) / (B) = 10 / 90-99 / 1 is preferable and 40 / 60-99 / 1 is more preferable.
[0019]
The deinking agent composition of the present invention contains the above-mentioned components (A) and (B) and the polypropylene glycol diether represented by the general formula (3) of the component (C), and has high whiteness and high L value, product paper of the high b value can be obtained is excellent in foam effect during deinking process.
[0020]
In the general formula (3), R ⁴ and R ⁵ are hydrocarbon groups. Among them, when considering the whiteness of recycled paper and the defoaming effect during the deinking process, R ⁴ and R ⁵ are preferably alkyl groups or alkenyl groups, and are alkyl groups or alkenyl groups having 1 to 4 carbon atoms. Further preferred. The degree of polymerization p is a number of 1 or more, preferably 1 to 200, more preferably 1 to 150, and most preferably 1 to 100.
[0021]
The blending amount of the component (C) is not particularly limited, but considering the whiteness of the recycled paper and the defoaming effect during the deinking process, (A) + (B) / (C) = 10/90 in weight ratio. ~ 99/1 is preferable, and 40/60 to 90/10 is more preferable.
[0022]
The amount of the deinking agent composition of the present invention is not particularly limited, but is preferably 0.001 to 15% by weight, and 0.005 to 10% by weight based on the weight of the used paper for efficient deinking. More preferred is 0.01 to 5% by weight.
[0023]
Examples of the waste paper to be deinked by the deinking agent composition of the present invention include newspapers, magazines, flyers, computer output paper, copy paper, etc., and in particular waste paper including computer output paper and copy paper is removed. Excellent effect when inking.
[0024]
The deinking agent composition of the present invention can be used in combination with other known deinking agents. Other deinking agents include, for example, ethers such as polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene (block copolymer or random copolymer) alkyl ether, and the like; polyoxyethylene alkyl And polyoxyalkylene alkylphenyl ethers such as phenyl ether and polyoxyethylene polyoxypropylene (block copolymer or random copolymer) alkylphenyl ether; polyoxyethylene polyoxypropylene block copolymer diether and the like. Examples of the fatty acid derivatives include polyoxyalkylene fatty acid esters such as polyoxyethylene fatty acid esters; alkylene oxide adducts of fats and oils; sorbitan esters such as sorbitan fatty acid esters and polyoxyethylene sorbitan fatty acid esters; polyoxyethylene sorbitol fatty acid esters Polyoxyalkylene sorbitol fatty acid esters such as monoethanolamine, diethanolamine and other alkanolamine fatty acid amides; Fatty acids such as sodium oleate, potassium oleate, sodium laurate, potassium laurate, sodium coconut fatty acid, potassium coconut fatty acid Soaps; fatty acid alkyl esters, fatty acids and the like. Examples of anionic deinking agents include alcohol sulfates; hydroxy fatty acid alkyl ester sulfates; alkyl ether sulfates such as polyoxyethylene alkyl sulfate; and polyoxyalkylene alkylphenyl sulfates such as polyoxyethylene alkylphenyl sulfate. Sulfonic acid esters of olefins; sulfonates such as alkyl sulfonates, α-olefin sulfonates, dialkyl sulfosuccinates; alkyl phosphates.
[0025]
In addition, the deinking agent composition of the present invention includes other known surfactants, for example, alcohol alkylene oxide adducts such as alcohol ethoxylates, alkylarylalkylene oxide adducts such as alkylphenol ethoxylates, and fatty acid alkylene oxide adducts. , Alkylamine alkylene oxide adduct, ethylene oxide / propylene oxide block polymer polyalkylene glycol, fatty acid glycerin ester, fatty acid glycol ester, fatty acid pentaerythritol ester, fatty acid sucrose ester, fatty acid sorbitan ester, fatty acid sorbitol ester, sucrose alkylene Oxide adduct, sorbitan alkylene oxide adduct, sorbitol alkylene oxide adduct, pentaerythritol al Nonionic surfactants such as fatty acid amides of lenoxide adducts and alkanolamines; fatty acid salts, alcohol sulfates, alcohol ether sulfates, alkyl sulfonates, nonyl phenols, styrenated phenols, sulfates of alkylaryls such as p-cumylphenol, Anionic surfactants such as ether sulfates of alkylaryls such as nonylphenol, styrenated phenol, p-cumylphenol, sulfonates of alkylbenzene, α-olefin sulfonates, sulfosuccinates, alkylphosphates; alkylamine salts, fourth Cationic surfactants such as quaternary ammonium salts; Betaine amphoteric surfactants such as carbobetaine and sulfobetaine; Amino acids such as glycine derivatives and alanine derivatives Type amphoteric surfactants and the like. Polymer flocculants, polymer dispersants, bleaching agents such as hydrogen peroxide and sodium hypochlorite, alkali agents such as sodium hydroxide and potassium hydroxide, enzymes such as lipase and cellulase, sodium silicate, carbonic acid It can be used in combination with other known additives such as sodium and chelating agents.
[0026]
Recycled paper produced using the deinking agent composition of the present invention can be used as newspaper or magazine paper, and of course has high whiteness and low residual ink and residual carbon. And OA paper such as computer output paper.
[0027]
【Example】
Hereinafter, the present invention will be described more specifically with reference to production examples and examples. In the examples, parts and% are based on weight unless otherwise specified. EO represents an oxyethylene group or ethylene oxide, PO represents an oxypropylene group or propylene oxide, and BO represents an oxybutylene group or butylene oxide. In the structural formula, “/” represents random addition, and “−” represents block addition.
[0028]
(Production Example 1)
386 g of a mixed alcohol of C _{12 to} C ₁₃ and 1.7 g of potassium hydroxide were charged into an autoclave, treated at 100 ° C. for 1 hour, and then dehydrated at the same temperature. Thereafter, the temperature was raised to 120 ° C., and 440 g of ethylene oxide (EO) was fed over 2 hours. Thereafter, aging was performed at the same temperature for 2 hours to obtain a colorless and transparent reaction product. Next, this reaction product and 432 g of a sodium methylate 28% methanol solution were charged and reacted at 10 mmHg and 110 ° C. for 6 hours. Thereafter, 116 g of methyl chloride was reacted at 80 ° C. for 3 hours and neutralized to obtain a C ₁₂ -C ₁₃ alcohol EO 5 mol adduct methyl ether (A-1).
[0029]
Hereinafter, (A-2) and (A- 3 ) were obtained by the same method.
_{(A-2) C 12 ~C} 13 alcohol EO8 mole adduct methyl ether (A- 3)
_{C 8 H 17 O- (EO)} 7 -C8H 17
[0030]
(Production Example 2)
186 g of lauryl alcohol and 4 g of potassium hydroxide were placed in an autoclave, treated at 100 ° C. for 1 hour, and then dehydrated at the same temperature. Thereafter, the temperature was raised to 120 ° C., and a mixture of 792 g of EO and 1,044 g of PO was fed over 7 hours. Thereafter, aging was carried out at the same temperature for 2 hours to obtain a colorless and transparent reaction product. The neutralization process was performed and the lauryl alcohol EO18 mol PO18 mol random adduct (B-1) was obtained.
[0031]
Hereinafter, (B-2 ) was obtained by the same method.
(B- 2 )
_{C 12 H 25 O- (EO)} 36 / (PO) 36 -H
[0032]
(Production Example 3)
386 g of C ₁₂ -C ₁₃ mixed alcohol and 3.1 g of potassium hydroxide were charged into an autoclave, treated at 100 ° C. for 1 hour, and then dehydrated at the same temperature. Thereafter, the temperature was raised to 120 ° C., and 1,160 g of PO was fed over 2 hours. Thereafter, aging was carried out at the same temperature for 2 hours to obtain a colorless and transparent reaction product. Next, this reaction product and 432 g of a sodium methylate 28% methanol solution were charged and reacted at 10 mmHg and 110 ° C. for 6 hours. Thereafter, 116 g of methyl chloride was reacted at 80 ° C. for 3 hours to carry out a neutralization treatment to obtain a C ₁₂ -C ₁₃ alcohol PO10 mol adduct methyl ether (C-1).
[0033]
Hereinafter, (C-2) to (C-4) were obtained in the same manner.
(C-2)
Embedded image
_{CH 3 O- (PO) 70 -CH} 3
(C-3)
Embedded image
_{CH 3 O- (PO) 43 -CH} 3
(C-4) Allyl alcohol PO 6 mol adduct allyl ether In addition to the above components, the following surfactants were used as other components.
[0034]
(Other 1) Nonylphenol EO 10 mol adduct
Using each of the above components, a deinking agent composition of the present invention and a comparative product were prepared at the blending ratios shown in Table 1 below.
[0036]
[Table 1]

[0037]
(Test 1)
After cutting 60 g of raw waste paper consisting of 50% offset newspaper waste paper, 20% letterpress printing waste paper, and 30% leaflet waste paper into 3cm squares, put it in a pulp disintegrator, put 1,500ml of tap water, 1.3% sodium hydroxide, 3.2% No. 3 caustic, 35% hydrogen peroxide 1.1%, 0.3% of each deinking agent composition of Examples 1 to 5 or Comparative Examples 1 to 3. In addition, disaggregation was performed for 25 minutes at a pulp concentration of 4.0%. Next, aging was performed at 50 ° C. for 1 hour. Thereafter, the pulp concentration was diluted to 1.0%, and a flotation treatment was performed at 25 ° C. for 10 minutes. A pulp sheet having a basis weight of 100 g / m ² was obtained from the obtained pulp using a TAPPI standard type paper machine.
Hunter whiteness, L value, and b value of the obtained sheet were measured with Σ80 (manufactured by Nippon Denshoku Industries Co., Ltd.).
The number of remaining inks was measured using an image analysis apparatus (Pierce LA-500) for the obtained pulp sheet.
The amount of floss measured was the amount scraped out during 10 minutes of flotation.
With respect to the time of foam loss, 100 ml of floss 1 minute after the start of flotation was collected in a 100 ml graduated cylinder, and the disappearance time of the foam was measured.
The measurement results are shown in the following table.
[0038]
[Table 2]

[0039]
(Test 2)
After cutting 60 g of raw paper (mixing ratio 1/1) made of computer output waste paper (CPO) and copy waste paper (PPC) into a 3 cm square, put it in a pulp disintegrator, and 1.50 ml of tap water, Add 1.3% sodium hydroxide, 0.3% of each deinking agent composition of Examples 1 to 5 or Comparative Examples 1 to 3 with respect to the weight of the waste paper, and disaggregate for 25 minutes at a pulp concentration of 4.0%. I did it. Next, aging was performed at 50 ° C. for 1 hour. Thereafter, the pulp concentration was diluted to 1.0%, and a washing test was conducted at 25 ° C. for 5 minutes. A pulp sheet having a basis weight of 100 g / m ² was obtained from the obtained pulp using a TAPPI standard type paper machine.
The Hunter whiteness, L value, and number of remaining inks of the obtained sheet were measured in the same manner as in Test 1.
The measurement results are shown in the following table.
[0040]
[Table 3]

[0041]
【The invention's effect】
The effect of the present invention is to provide a deinking agent composition that can provide product paper with high hunter whiteness, high L value, and high b value, and is excellent in the defoaming effect during the deinking process.

Claims (6)

As the component (A), the following general formula (1)
R ¹ —O— (AO ¹ ) _m —R ² (1)
(In the formula, R ¹ and R ² represent a hydrocarbon group, AO ¹ represents an oxyalkylene group, and m represents a number of 1 or more.)
A polyalkylene glycol diether represented by :
As the component ( B), the following general formula (2)
R ³ —O— (AO ² ) _n —H (2)
[Wherein, R ³ represents a hydrocarbon group, (AO ² ) _n represents a polyoxyalkylene chain composed of two or more oxyalkylene groups, and n represents a number of 2 or more. ]
A polyalkylene glycol monoether represented by:
And as (C) component, following general formula (3)
R ⁴ —O— (C ₃ H ₆ O) _p —R ⁵ (3)
(In the formula, R ⁴ and R ⁵ represent a hydrocarbon group, and p represents a number of 1 or more.)
A deinking agent composition comprising a polypropylene glycol diether represented by: The deinking agent composition according to claim ^{1, wherein} (AO ¹ ) _m is a polyoxyalkylene chain containing an oxyethylene group. The deinking agent composition according to claim 1 or 2, wherein (AO ² ) _n is a polyoxyalkylene chain formed by random copolymerization of an oxyethylene group and other oxyalkylene groups. The deinking agent composition according to any one of claims 1 to 3, wherein R ³ is an alkyl group or an alkenyl group having 6 to 28 carbon atoms. The deinking agent composition according to any one of claims 1 to 4, wherein R ⁴ or R ⁵ is an alkyl group or an alkenyl group having 1 to 4 carbon atoms. The deinking agent composition according to any one of claims 1 to 5 , further comprising another surfactant.