JP4675519B2 - Two-component liquid bleach - Google Patents

Description

【００２５】
〔式中、Ｒ¹は前記の意味を示す。ｕ及びｖの合計は３〜２０、好ましくは３〜１５、特に好ましくは２〜１０の数である。〕。
【００２６】
本発明ではこれらの中でも特に（１−ａ）又は（１−ｂ）から選ばれる非イオン界面活性剤が好ましい。
【００２７】
陽イオン界面活性剤としては、下記一般式（２）のモノ長鎖アルキル（もしくはアルケニル）トリ短鎖アルキル型陽イオン界面活性剤が好ましい。
【００２８】
【化２】

【００２９】
〔式中、Ｒ³は炭素数８〜１８、好ましくは１０〜１８、特に好ましくは１０〜１６のアルキル基又はアルケニル基であり、Ｒ⁴、Ｒ⁵、Ｒ⁶は同一又は異なっていてもよい炭素数１〜３のアルキル基である。Ｘ^-は陰イオン、好ましくはハロゲンイオン、炭素数１〜３のアルキル硫酸エステルイオン、炭素数１〜１２の脂肪酸イオン、炭素数１〜３の置換基を１〜３個有していてもよいアリールスルホン酸イオンである。〕。
【００３０】
陰イオン界面活性剤としては、分子中に炭素数１０〜１８、好ましくは１０〜１６、特に好ましくは１０〜１５のアルキル基又はアルケニル基と、−ＳＯ₃Ｍ基及び／又は−ＯＳＯ₃Ｍ基〔Ｍ：対イオン〕を有する陰イオン界面活性剤が好ましい。具体的には上記炭素数を有するアルキルベンゼンスルホン酸、アルキル（又はアルケニル）硫酸エステル、ポリオキシアルキレンアルキル（又はアルケニル）エーテル硫酸エステル、オレフィンスルホン酸、アルカンスルホン酸、α−スルホ脂肪酸、α−スルホ脂肪酸エステル及びこれらの塩が好ましい。これらの中でも特に炭素数１０〜１６のアルキル基又はアルケニル基を有するアルキル（又はアルケニル）硫酸エステル、炭素数１０〜１６のアルキル基又はアルケニル基を有し、エチレンオキシド（以下、ＥＯと表記する）平均付加モル数が１〜６、好ましくは１〜４、特に好ましくは１〜３であるポリオキシエチレンアルキル（又はアルケニル）エーテル硫酸エステル、炭素数１０〜１５のアルキル基を有するアルキルベンゼンスルホン酸、及びこれらの塩から選ばれる一種以上を配合することが好ましい。塩としては、ナトリウム塩、カリウム塩、アンモニウム塩、アルカノールアミン塩が貯蔵安定性の点から良好である。
【００３１】
両性界面活性剤としては、下記一般式（３）の化合物又は一般式（４）の化合物から選ばれる化合物が好ましい。
【００３２】
【化３】

【００３３】
〔式中、Ｒ⁷は炭素数８〜１６、好ましくは１０〜１６、特に好ましくは１０〜１４の直鎖アルキル基又はアルケニル基であり、Ｒ⁸、Ｒ⁹は、それぞれ炭素数１〜３のアルキル基又はヒドロキシアルキル基である。Ｒ¹⁰は炭素数１〜５、好ましくは２又は３のアルキレン基である。Ａは−ＣＯＯ−、−ＣＯＮＨ−、−ＯＣＯ−、−ＮＨＣＯ−、−Ｏ−から選ばれる基であり、ｃは０又は１、好ましくは１の数である。〕
【００３４】
【化４】

【００３５】
〔式中、Ｒ¹¹は炭素数９〜２３、好ましくは９〜１７、特に好ましくは１０〜１６のアルキル基又はアルケニル基であり、Ｒ¹²は炭素数１〜６、好ましくは１〜４、特に好ましくは２又は３のアルキレン基である。Ｂは−ＣＯＯ−、−ＣＯＮＨ−、−ＯＣＯ−、−ＮＨＣＯ−、−Ｏ−から選ばれる基であり、ｄは０又は１の数、好ましくは０である。Ｒ¹³、Ｒ¹⁴は、それぞれ炭素数１〜３のアルキル基又はヒドロキシアルキル基、好ましくはメチル基、エチル基又はヒドロキシエチル基であり、Ｒ¹⁵はヒドロキシ基で置換していてもよい炭素数１〜５、好ましくは１〜３のアルキレン基である。Ｄは、−ＳＯ₃ ^-、−ＯＳＯ₃ ^-、から選ばれる基であり、特に−ＳＯ₃ ^-が漂白洗浄効果の点から良好である。〕。
【００３６】
本発明のＡ剤は、漂白洗浄効果の点から、非イオン界面活性剤を０．５〜１５質量％、更に１〜１０質量％含有することが好適であり、陽イオン界面活性剤を０．１〜２質量％、更に０．１〜１質量％含有することが好適であり、両性界面活性剤を０〜１０質量％、更に０．１〜５質量％含有することが好適である。
【００３７】
また、本発明のＢ剤は、洗浄効果の点から、非イオン界面活性剤を０〜４０質量％、更に１〜３５質量％含有することが好適であり、陰イオン界面活性剤を０〜３０質量％、更に０．１〜１０質量％含有することが好適である。また、両性界面活性剤を０〜１５質量％、更に０．５〜５質量％含有することが好適であり、陽イオン界面活性剤を０〜１０質量％、更に０．１〜５質量％含有することが好適である。
【００３８】
本発明では、Ａ剤及び／又はＢ剤に、洗浄性を向上させる目的から、アクリル酸、メタクリル酸、又はマレイン酸を重合して得られるホモポリマー若しくはこれらのモノマーからなるコポリマー、又はこれらのモノマーと共重合可能な他のモノマーとのコポリマー等のカルボン酸系ポリマーを配合することが好ましい。
【００３９】
これらのカルボン酸系ポリマーの重量平均分子量は、好ましくは３，０００〜１００，０００、更に好ましくは５，０００〜８０，０００である。重量平均分子量は、ポリエチレングリコールを標準物質としてゲルパーミエーションクロマトグラフィーで求めることが出来る。
【００４０】
また、このようなカルボン酸系ポリマーは一部及び／又は全部がアルカリ剤で中和された塩の状態であっても差し支えない。アルカリ剤としては、ナトリウム、カリウム等のアルカリ金属を含む化合物が好ましい。
【００４１】
具体的には、好ましくは重量平均分子量３，０００〜３０，０００のポリアクリル酸ナトリウム（若しくはカリウム）又はポリメタクリル酸ナトリウム（若しくはカリウム）、あるいは好ましくは重量平均分子量２０，０００〜１００，０００、更に好ましくは５０，０００〜８０，０００のアクリル酸−マレイン酸コポリマーのナトリウム塩（もしくはカリウム塩）が良好である。アクリル酸−マレイン酸コポリマーの場合はアクリル酸／マレイン酸が質量比で５／５〜９／１、好ましくは６／４〜８／２が洗浄効果の点から好ましい。
【００４２】
本発明において、上記カルボン酸系ポリマーの含有量は、Ａ剤中、好ましくは０〜１０質量％、更に好ましくは０．１〜７質量％であり、Ｂ剤中、好ましくは０．５〜１０質量％、更に好ましくは１〜８質量％である。
【００４３】
本発明のＡ剤には、漂白効果を高める上で漂白活性化剤を含有することが好ましい。漂白活性化剤としては漂白効果及び貯蔵安定性の点からアルカノイルオキシベンゼン型漂白活性化剤が好ましく、特に炭素数６〜１４、好ましくは７〜１３のアルカノイル基を有するアルカノイルオキシベンゼンスルホン酸もしくは炭素数６〜１４、好ましくは７〜１３のアルカノイル基を有するアルカノイルオキシベンゼンカルボン酸又はこれらの塩が好ましい。具体的に好ましい例としてはオクタノイルオキシ−ｐ−ベンゼンスルホン酸、ノナノイルオキシ−ｐ−ベンゼンスルホン酸、３，５，５−トリメチルヘキサノイルオキシ−ｐ−ベンゼンスルホン酸、デカノイルオキシ−ｐ−ベンゼンスルホン酸、ドデカノイルオキシ−ｐ−ベンゼンスルホン酸、オクタノイルオキシ−ｏ−又は−ｐ−ベンゼンカルボン酸、ノナノイルオキシ−ｏ−又は−ｐ−ベンゼンカルボン酸、３，５，５−トリメチルヘキサノイルオキシ−ｏ−又は−ｐ−ベンゼンカルボン酸、デカノイルオキシ−ｏ−又は−ｐ−ベンゼンカルボン酸、ドデカノイルオキシ−ｏ−又は−ｐ−ベンゼンカルボン酸、及びこれらの塩が挙げられる。塩としてはナトリウム塩、カリウム塩、マグネシウム塩が好ましく、特にナトリウム塩が溶解性の点から好ましい。
【００４４】
これらの中でも特にノナノイルオキシ−ｐ−ベンゼンスルホン酸、デカノイルオキシ−ｐ−ベンゼンカルボン酸、ドデカノイルオキシ−ｐ−ベンゼンスルホン酸及びこれらの塩が親油性汚れ漂白効果の点から好ましい。本発明のＡ剤には漂白活性化剤を０．０５〜５質量％、好ましくは０．１〜１質量％配合することが漂白効果の点から好ましい。
【００４５】
本発明のＢ剤には洗浄効果を高める目的で溶剤を配合することが好ましい。溶剤としては（１）炭素数１〜５の１価アルコール、（２）炭素数２〜１２の多価アルコール、（３）下記の一般式（５）で表される化合物、（４）下記の一般式（６）で表される化合物、（５）下記の一般式（７）で表される化合物が好ましい。
【００４６】
【化５】

【００４７】
〔式中、Ｒ¹⁶及びＲ¹⁷は、それぞれ水素原子、炭素数１〜６のアルキル基、フェニル基又はベンジル基を示すが、Ｒ¹⁶及びＲ¹⁷の双方が水素原子となる場合を除く。ｇは０〜１０の数を、ｈは０〜１０の数を示すが、ｇ及びｈの双方が０である場合を除く。Ｒ¹⁸及びＲ¹⁹は、それぞれ炭素数１〜３のアルキル基を示す。Ｒ²⁰は炭素数１〜８のアルキル基を示す。〕。
【００４８】
（１）の炭素数１〜５の１価アルコールとしては、一般的にエタノール、プロピルアルコール、イソプロピルアルコールが挙げられる。これらの低級アルコールを配合することにより低温における系の安定性を更に向上させることができる。
【００４９】
（２）の炭素数２〜１２の多価アルコールとしては、イソプレングリコール、２，２，４−トリメチル−１，３−ペンタンジオール、１，８−オクタンジオール、１，９−ノナンジオール、エチレングリコール、プロピレングリコール、ジエチレングリコール、ジプロピレングリコール、グリセリン等が挙げられる。
【００５０】
（３）の化合物は、一般式（５）において、Ｒ¹⁶、Ｒ¹⁷がアルキル基である場合の炭素数は１〜４が特に好ましい。また、一般式（５）中、ＥＯ及びプロピレンオキシドの平均付加モル数のｇ及びｈは、それぞれ０〜１０の数である（ｇ及びｈの双方が０である場合を除く）が、これらの付加順序は特に限定されず、ランダム付加したものであってもよい。（３）の化合物の具体例としては、エチレングリコールモノブチルエーテル、ジプロピレングリコールジメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノブチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールジメチルエーテル、ポリオキシエチレン（ｐ＝２〜３）ポリオキシプロピレン（ｐ＝２〜３）グリコールジメチルエーテル（ｐは平均付加モル数を示す）、ポリオキシエチレン（ｐ＝３）グリコールフェニルエーテル、フェニルカルビトール、フェニルセロソルブ、ベンジルカルビトール等が挙げられる。このうち、洗浄力及び使用感の点から、プロピレングリコールモノメチルエーテル、ジエチレングリコールモノブチルエーテル、ポリオキシエチレン（ｐ＝１〜４）グリコールモノフェニルエーテルが好ましい。
【００５１】
また、（４）の化合物としては、１，３−ジメチル−２−イミダゾリジノン、１，３−ジエチル−２−イミダゾリジノンが好適なものとして例示され、（５）の化合物としてはアルキルグリセリルエーテル化合物が好適なものとして例示され、好ましくはＲ²⁰が炭素数３〜８のアルキル基の化合物である。
【００５２】
これらのなかでも本発明の性質を満たすために（１）、（２）、（３）、（５）の水溶性溶剤が好ましく、特にエタノール、イソプロピルアルコール、エチレングリコール、プロピレングリコール、ジエチレングリコール、ジプロピレングリコール、グリセリン、イソプレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、ペンチルグリセリルエーテル、オクチルグリセリルエーテル、ポリオキシエチレン（ｐ＝１〜４）グリコールモノフェニルエーテルから選ばれる溶剤が好ましい。
【００５３】
本発明のＢ剤は、このような溶剤を０〜２０質量％、更に５〜２０質量％含有することが良好である。
【００５４】
本発明では上記Ａ剤及びＢ剤を混合して漂白洗浄を行うものであり、使用時の混合比率が変動した場合にも、高いｐＨとなることが漂白効果の点から好ましい。このため、本発明では、Ａ剤とＢ剤として、Ａ剤／Ｂ剤＝１／３〜３／１、更に１／５〜５／１、特に１／１０〜１０／１の質量比で混合した混合液のｐＨが、前記質量比の範囲の何れにおいても、２０℃において８．５以上となるものが用いられる。該ｐＨは、好ましくは８．８以上、更に好ましくは９．５以上、特に好ましくは９．８以上であり、上限は１１．５以下が好ましく、１１以下が更に好ましい。該混合液のｐＨが、前記何れの混合比においても、前記の範囲内にある場合は、充分な漂白効果を有する。
【００５５】
また、更に良好な漂白効果を得るために、Ａ剤とＢ剤を質量比でＡ剤／Ｂ剤＝１／３〜３／１、更に１／５〜５／１、特に１／１０〜１０／１の範囲で混合した混合液を０．１質量％となるように水で希釈した液の２０℃におけるｐＨが、前記質量比の範囲の何れにおいても、８．５以上、更に８．８以上であることが好ましく、上限は、１１．５以下が好ましく、１１以下が更に好ましい。
【００５６】
上記から、本発明の２剤型液体漂白剤は、使用の際のＡ剤とＢ剤の混合比率が、質量比でＡ剤／Ｂ剤＝１／３〜３／１、更に１／５〜５／１、特に１／１０〜１０／１となるように、Ａ剤、Ｂ剤の組成や容器を設計することが、漂白洗浄効果の点から好ましい。
【００５７】
更に良好な安定性と漂白効果を得るためには、２０℃においてＡ剤１０００ｍｌのｐＨを７にするために必要な０．１規定水酸化ナトリウム水溶液の量をＸ（ｍｌ）とし、２０℃においてＢ剤１０００ｍｌのｐＨを７にするために必要な１規定硫酸水溶液の量をＹ（ｍｌ）とすると、ＸとＹの関係は、（Ｙ／１０）＜Ｘ＜Ｙ×（１０／３）であることが好ましく、（Ｙ／１０）＜Ｘ＜Ｙであることがより好ましい。
【００５８】
２０℃における粘度はＡ剤及びＢ剤いずれも好ましくは３〜３００ｍＰａ・ｓ、更に好ましくは４〜２００ｍＰａ・ｓの範囲に調整することが使い勝手の点から好適である。このような粘度に調整するために本発明ではＡ剤及び／又はＢ剤に粘度調整剤を配合することができる。粘度調整剤としては炭素数１〜３のアルキル基、もしくはヒドロキシ基が１〜３個置換していてもよいベンゼンスルホン酸、分子量３０００〜１０００００のポリエチレングリコール又はポリプロピレングリコールを用いることができる。このような粘度調整剤の含有量は、Ａ剤及び／又はＢ剤中、好ましくは０〜１０質量％、更に好ましくは０．０１〜５質量％である。
【００５９】
更に、本発明のＢ剤は金属イオン封鎖剤を含有することが好ましい。本発明に用いられる金属イオン封鎖剤としては、下記（ｉ）〜（viii）のものが挙げられ、なかでも（ii）、（ｖ）、（vi）及び（vii）からなる選ばれる少なくとも１種が好ましく、（ii）から選ばれる少なくとも１種が更に好ましい。
（ｉ）フィチン酸等のリン酸系化合物のアルカリ金属塩もしくはアルカノールアミン塩
（ii）エタン−１，１−ジホスホン酸、エタン−１，１，２−トリホスホン酸、エタン−１−ヒドロキシ−１，１−ジホスホン酸及びその誘導体、エタンヒドロキシ−１，１，２−トリホスホン酸、エタン−１，２−ジカルボキシ−１，２−ジホスホン酸、メタンヒドロキシホスホン酸等のホスホン酸のアルカリ金属塩もしくはアルカノールアミン塩
（iii）２−ホスホノブタン−１，２−ジカルボン酸、１−ホスホノブタン−２，３，４−トリカルボン酸、α−メチルホスホノコハク酸等のホスホノカルボン酸のアルカリ金属塩もしくはアルカノールアミン塩
（iv）アスパラギン酸、グルタミン酸、グリシン等のアミノ酸のアルカリ金属塩もしくはアルカノールアミン塩
（ｖ）ニトリロ三酢酸、イミノ二酢酸、エチレンジアミン四酢酸、ジエチレントリアミン五酢酸、グリコールエーテルジアミン四酢酸、ヒドロキシエチルイミノ二酢酸、トリエチレンテトラミン六酢酸、ジエンコル酸等のアミノポリ酢酸のアルカリ金属塩もしくはアルカノールアミン塩
（vi）ジグリコール酸、オキシジコハク酸、カルボキシメチルオキシコハク酸、クエン酸、乳酸、酒石酸、シュウ酸、リンゴ酸、オキシジコハク酸、グルコン酸、カルボキシメチルコハク酸、カルボキシメチル酒石酸等の有機酸のアルカリ金属塩もしくはアルカノールアミン塩
（vii）ゼオライトＡに代表されるアルミノケイ酸のアルカリ金属塩又はアルカノールアミン塩
（viii）アミノポリ（メチレンホスホン酸）のアルカリ金属塩もしくはアルカノールアミン塩、又はポリエチレンポリアミンポリ（メチレンホスホン酸）のアルカリ金属塩もしくはアルカノールアミン塩。
【００６０】
このような金属イオン封鎖剤の含有量は、Ｂ剤中に好ましくは０〜５質量％、更に好ましくは０．０１〜１質量％である。
【００６１】
本発明のＡ剤及び／又はＢ剤には、上記成分の他に通常漂白剤に添加される公知の成分を添加することができる。例えば、過酸化水素の安定化剤として公知の硫酸マグネシウム、珪酸マグネシウム、塩化マグネシウム、ケイフッ化マグネシウム、酸化マグネシウム、水酸化マグネシウム等のマグネシウム塩及び珪酸ソーダのような珪酸塩類を用いることが好ましい。更に、必要に応じてカルボキシメチルセルロース、ポリビニルピロリドン、ポリエチレングリコールのような再汚染防止剤等を添加することが好ましい。
【００６２】
また、本発明のＡ剤及び／又はＢ剤には、更に種々の化合物を含有させることができる。例えば、過酸化水素の安定化剤として知られているリン酸、バルビツール酸、尿酸、アセトアニリド、オキシキノリンやフェナセチン等に代表されるアミノポリカルボン酸類、及び、ＤＬ−α−トコフェロール、没食子酸誘導体、ブチル化ヒドロキシアニソール（ＢＨＡ）、２，６−ジ−tert−ブチル−４−メチルフェノール（ＢＨＴ）等を添加することが好ましい。これらの安定化剤はＡ剤及び／又はＢ剤中に、好ましくは通常０〜５質量％程度、更に好ましくは０．０１〜３質量％含有させるのが良い。
【００６３】
また、本発明のＡ剤及び／又はＢ剤には、変退色防止剤として公知の物資を含むことが好ましい。このような物質としてはフェニルアラニン、ヒスチジン、リジン、チロシン、メチオニン等のアミノ酸及びアミノ酸塩類、及びヒドロキシイミノジ酢酸等のアミノ又はイミド化合物、更にはアクリロニトリルと第四級アンモニウム基を有するアクリロニトリルと共重合可能なモノマーの一種又は二種以上とのコポリマー等である。なお、アミノ酸には光学異性体が存在するが、本発明の効果においては光学異性体は関与しない。従って、化学的に合成したアミノ酸を使用することも可能である。
【００６４】
また、本発明のＡ剤及び／又はＢ剤には、漂白繊維に対する漂白効果を増すために蛍光増白剤として、チノパールＣＢＳ（チバ・ガイギー社製）、チノパールＳＷＮ（チバ・ガイギー社製）や、カラー・インデックス蛍光増白剤２８、４０、６１、７１等のような蛍光増白剤や、漂白性能を向上させるために従来公知の酵素（セルラーゼ、アミラーゼ、プロテアーゼ、リパーゼ）を必要に応じて配合することが好ましい。
【００６５】
また、本発明のＡ剤及び／又はＢ剤には、染料や顔料のような着色剤、香料、シリコーン類、殺菌剤、紫外線吸収剤等の種々の微量添加物を適量配合することが好ましい。
【００６６】
また、上記成分の他に通常添加される公知の成分を添加することができる。低温での液の安定性及び凍結復元性を改善したり、高温での液分離を防止する目的でハイドロトロープ剤を配合することが好ましい。このようなハイドロトロープ剤としては、一般的には、トルエンスルホン酸塩、キシレンスルホン酸塩等に代表される短鎖アルキルベンゼンスルホン酸塩、エタノール、エチレングリコール、プロピレングリコール、ヘキシレングリコール、グリセリン等に代表されるアルコール及び多価アルコール等が好ましい。ハイドロトロープ剤はＡ剤及び／又はＢ剤中に０〜３０質量％程度配合することが好ましい。
【００６７】
本発明の２剤型液体漂白剤は、衣料用洗剤、衣料用漂白助剤、衣料用塗布洗浄剤、まな板、湯飲み茶碗、シンク等の台所用漂白剤、食器用洗剤、風呂用、壁用、絨毯用の漂白洗浄剤から選択される用途に使用されることが好ましい。また、衣料の漂白洗浄に使用することが更に好ましい。
【００６８】
本発明の２剤型液体漂白剤は、水道水に予めＡ剤、Ｂ剤を溶解させた水溶液（好ましくは０．０５〜３０質量％）に衣料を浸漬させて漂白することができる。また、本発明の２剤型液体漂白剤は、従来公知の衣料用洗剤と混合して使用することもできる。漂白時に、Ａ剤及び／又はＢ剤を３０〜５０℃に加温することも好ましい。
【００６９】
更に、通常の洗濯機での洗濯において、本発明の２剤型液体漂白剤を従来公知の衣料用洗剤と混合して使用することもできる。
【００７０】
また、本発明の２剤型液体漂白剤は、衣料に直接塗布して放置後、水洗する漂白方法に用いることができる。また、衣料に直接塗布して放置後、通常の洗濯機での洗濯で従来公知の衣料用洗剤と混合して使用することもできる。塗布した後の放置時間は、０〜１８０分が好ましく、更に１〜６０分が更に好ましい。
【００７１】
また、本発明の２剤型液体漂白剤を衣料用洗剤として使用する場合には、本発明の２剤型液体漂白剤を用いて通常の洗濯機での洗濯を行うこともでき、あるいは衣料に直接塗布して放置後に通常の洗濯機での洗濯を行うこともできる。
【００７２】
本発明の２剤型液体漂白剤は、特に上記のような混合比率を容易に達成する目的で、Ａ剤及びＢ剤を同時に吐出可能な吐出部を具備した容器を用いることが好ましい。また、容器は、Ａ剤、Ｂ剤を分離して保持できるものであり、例えばＡ剤とＢ剤をそれぞれ異なる格納部に収納可能な一体型容器、Ａ剤を収納可能な容器とＢ剤を収納可能な容器とを適当な部材で接合した連結型容器が挙げられる。特に、本発明に用いられる容器の吐出部の開口面積は、Ａ剤吐出部とＢ剤吐出部が面積比で１／１０〜１０／１、更に１／５〜５／１、特に１／３〜３／１が吐出量を調整する上で好ましい。吐出量の調整は、Ａ剤とＢ剤の粘度及び吐出部の開口面積や形状を調整することにより公知の方法で達成することができる。具体的な容器の模式図を図１、図２に示す。図１中（１１）、（１２）はＡ剤又はＢ剤の収容部であり、一方にＡ剤が、他方にＢ剤が収容される。各収容部は（１３）の隔壁により分離され、該容器中ではＡ剤とＢ剤は分離して保持される。（１４）はＡ剤及びＢ剤を同時に吐出する吐出部である。また、図２中（２１）、（２２）はＡ剤又はＢ剤の収容部であり、一方にＡ剤が、他方にＢ剤が収容される。これらは（２３）の接合部で接合されている。（２４）はＡ剤及びＢ剤を同時に吐出する吐出部である。
【００７３】
また、本発明に用いられる容器は、図１、２のような、Ａ剤及びＢ剤を計量できるキャップ（１−１）、（２−１）を使用することが好ましい。このようなキャップを用いることにより、Ａ剤とＢ剤とを計量する工程において両者を混合した後に汚れに作用させることが可能になり、高い漂白性能を得ることができる。
【００７４】
【実施例】
表１に示すＡ剤及び表２に示すＢ剤を、表３に示す組み合わせで図１又は図２の容器に充填して、２剤型液体漂白剤を調製し、貯蔵安定性及び漂白効果を以下の方法で評価した。結果を表３に示す。用いた容器は以下の通りである。
【００７５】
なお、表１、２中のｐＨは２０℃にて測定した値であり、１０質量％硫酸水溶液又は３０質量％ＮａＯＨ水溶液を用いて調整した。
【００７６】
また、表３中の混合液のｐＨは、Ａ剤とＢ剤を、Ａ剤／Ｂ剤＝３／１の質量比となるように混合した混合液のｐＨを２０℃にて測定した値である。なお、実施例１〜４は、Ａ剤とＢ剤を質量比で、１／３〜３／１の範囲で混合した混合液のｐＨが、前記質量比の範囲の何れにおいても、２０℃において８．５以上であった。
【００７７】
また、表１、２に、２０℃においてＡ剤１０００ｍｌのｐＨを７にするために必要な０．１規定水酸化ナトリウム水溶液の量（以下、Ａ剤の０．１規定ＮａＯＨ必要量という）、及び２０℃においてＢ剤１０００ｍｌのｐＨを７にするために必要な１規定硫酸水溶液の量（以下、Ｂ剤の１規定Ｈ₂ＳＯ₄必要量という）を、以下の方法で測定した結果を併せて示した。
【００７８】
＜容器１＞
図１の形状で、本体部は直径９ｃｍ、高さ２２ｃｍ、首部の直径は３．５ｃｍ、キャップ部は直径３．５ｃｍ、高さ３ｃｍであるポリエチレン製の容器。
【００７９】
＜容器２＞
図２の形状で、本体外容器部は直径７ｃｍ、高さ２６ｃｍ、首部の直径は３．５ｃｍ、本体内容器部は直径４ｃｍ、高さ２５ｃｍ、首部の直径は０．９ｃｍ、キャップ部は直径３．５ｃｍ、高さ５ｃｍであるポリエチレン製の容器。Ａ剤は収容部（２１）（外容器）に、Ｂ剤は収容部（２２）（内容器）に充填した。
【００８０】
＜貯蔵安定性＞
表３の２剤型液体漂白剤から、Ａ剤とＢ剤の混合液をキャップに注ぎ、次にキャップの混合液を排出した。ここで、混合液のＡ剤、Ｂ剤の比率は表３の通りであり、合計の吐出量は、容器１では２５ｍｌ、容器２では４０ｍｌとした。その後、直ちに容器をキャップで密封し、２時間室温（２３℃）で放置した。この操作を５回繰り返した後、容器をキャップで密封した状態で、４０℃の恒温室に貯蔵した。４週間貯蔵後、容器の外観を下記の基準で目視により判定した。
容器の膨れは見られない…５
やや容器の膨れが見られる…４
容器が膨れている…３
容器が著しく膨れている…２
容器が破損している…１
５本の平均を求め、平均点が４以上を○、３以上４未満を□、２以上３未満を△、２未満を×として判定し表３に示した。
【００８１】
＜漂白効果＞
表３の２剤型液体漂白剤からＡ剤とＢ剤を、合計１ｍｌ（Ａ剤とＢ剤の比率は表３の通り）となるように吐出させ、下記の通り調製したカレー汚染布（親油性汚れ）４枚に、１枚ずつ塗布し、５分間放置した。その後、濃度０．０６６７質量％の市販洗剤水溶液に投入し、ターゴトメーターにて普通洗浄した（８０ｒｐｍ×１０分）後、水道水ですすぎ、乾燥させて、次式により漂白率を算出した。
【００８２】
【数１】

【００８３】
反射率は日本電色工業（株）製ＮＤ−３００Ａで４６０ｎｍフィルターを使用して測定した。
【００８４】
＜カレー汚染布の調製＞
ハウス食品製レトルトカレー（カレーマルシェ）の固形分をメッシュで除去した後、得られた液を煮沸するまで加熱した。この液に木綿金布＃２００３を浸し、約１５分間煮沸した。そのまま火よりおろし、約２時間程度放置後、布を取りだし、余分に付着しているカレー液をへらで除去し自然乾燥させた。その後プレスし、１０ｃｍ×１０ｃｍの試験片として実験に供した。
【００８５】
＜Ａ剤の０．１規定ＮａＯＨ必要量の測定＞
Ａ剤１０００ｍｌをビーカーにとり、０．１規定ＮａＯＨ水溶液を、ビュレットを用いて滴下し、攪拌し、ｐＨメーター（堀場製作所製 ｐＨ ＭＥＴＥＲ Ｆ−１４）にてｐＨ値を測定した。なお、測定は２０℃の恒温室にて、各溶液及び実験器具を２０℃にして行った。
【００８６】
＜Ｂ剤の１規定Ｈ₂ＳＯ₄必要量の測定＞
Ｂ剤１０００ｍｌをビーカーにとり、１規定Ｈ₂ＳＯ₄水溶液を、ビュレットを用いて滴下し、攪拌し、ｐＨメーター（堀場製作所製 ｐＨ ＭＥＴＥＲ Ｆ−１４）にてｐＨ値を測定した。なお、測定は２０℃の恒温室にて、各溶液及び実験器具を２０℃にして行った。
【００８７】
【表１】

【００８８】
１）１−ヒドロキシエチリデン−１，１−ジホスホン酸
２）エチレンジアミン４酢酸
３）ポリオキシエチレンラウリルエーテル（ＥＯ平均付加モル数６）
４）ＲＯ(Ｃ₂Ｈ₄Ｏ)_n(Ｃ₃Ｈ₆Ｏ)_m−Ｈ（Ｒ：ラウリル、ｎ：５、ｍ：３）
５）アルキル（炭素数１２〜１５）ベンゼンスルホン酸ナトリウム
６）ポリオキシエチレンラウリルエーテル硫酸エステルナトリウム（ＥＯ平均付加モル数２）
７）α−オレフィン（炭素数１６）スルホン酸ナトリウム
８）Ｎ−テトラデシル−Ｎ，Ｎ，Ｎ−トリメチルアンモニウムクロリド
９）Ｎ−ラウリル−Ｎ，Ｎ−ジメチル−Ｎ−（２−ヒドロキシ−１−スルホプロピル）アンモニウムスルホベタイン
１０）ラウロイルオキシベンゼンスルホン酸ナトリウム
【００８９】
【表２】

【００９０】
１１）ポリアクリル酸ナトリウム（重量平均分子量１００００）
１２）ｐ−トルエンスルホン酸ナトリウム
【００９１】
【表３】

【００９２】
また、表１に示すＡ剤及び表２に示すＢ剤を、表４に示す組み合わせで調製した２剤型液体漂白剤について、Ａ剤／Ｂ剤吐出量比を表４のように変更した場合の漂白効果を評価した。評価は、図２の容器を用い、Ａ剤を４００ｍｌ、Ｂ剤を２００ｍｌ充填し、吐出部の開口面積を調整することで吐出量比を変更して行った。漂白効果は、前記した方法で測定した漂白率が６５％以上を「○」、４０％以上６５％未満を「△」、４０％未満を「×」として評価した。結果を表４に示す。
【００９３】
【表４】

【００９４】
【発明の効果】
本発明の２剤型液体漂白剤は、Ａ剤、Ｂ剤共、適度な緩衝能を有しているため、貯蔵安定性に優れており、混合比率が変動した場合でも漂白効果が高い。
【図面の簡単な説明】
【図１】Ａ剤、Ｂ剤を収容する２剤型容器の一例を示す模式図
【図２】Ａ剤、Ｂ剤を収容する２剤型容器の他の例を示す模式図
【符号の説明】
（１１）、（１２）：Ａ剤又はＢ剤の収容部
（１３）：隔壁
（１４）：吐出部
（１−１）：キャップ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-component liquid bleach.
[0002]
[Prior art and problems to be solved by the invention]
Liquid bleaching agents based on hydrogen peroxide are preferred because they can be used for colors and patterns, and can be applied directly to dirt. In addition, research on two-component liquid bleaching agents has been conducted for the purpose of enhancing storage stability and bleaching effect. In JP-A-3-140400, JP-A-6-166892, JP-A-9-157893, and JP-A-9-48997, A agent containing hydrogen peroxide and B containing bleach activator are disclosed. A bleach composition comprising an agent is disclosed. Although these techniques are more excellent in bleaching effect than when a liquid oxygen bleach containing hydrogen peroxide as a main base is used alone, it is still not satisfactory.
[0003]
Moreover, the liquid bleach currently marketed is generally used by separating a predetermined amount into a cap and applying it to clothes or putting it into a washing machine. However, in the case of the two-component bleaching agent in which the agent A and the agent B are stored in separate containers, there is a problem in workability because one metering is performed with the cap and the other metering is performed. Further, from the viewpoint of improving workability, in order to make a container that simultaneously measures two liquids with a two-component bleaching agent, it is necessary to install a two-liquid discharge port at a close position. In this case, one discharge liquid may be mixed into the container from the other discharge port during discharge. Further, if the cap is closed after using the measured liquid, the liquid remaining in a small amount on the inner wall of the cap may be mixed into the container. As described above, when one of the A agent and the B agent is mixed with the other, the conventional two-component liquid bleaching agent described above has a problem that the decomposition reaction of hydrogen peroxide is promoted and the container is significantly expanded during storage. .
[0004]
Further, the two-component liquid bleaching agent has a problem that the mixing ratio of the agent A and the agent B fluctuates while being repeatedly used at home and the like. This is thought to be due to the fact that the angle at which the container is held, the angle at which the container is tilted, etc. are slightly different for each operation, which affects the discharge amount of the two liquids. Operation) and late use (last few operations), the mixing ratio of agent A and agent B varies greatly. Therefore, it is desirable to maintain a high pH of the mixed solution and realize high bleaching power even if the mixing ratio varies.
[0005]
Accordingly, an object of the present invention is to provide a two-component liquid bleaching agent that is excellent in bleaching effect even if the mixing ratio varies, is easy to use, and has no problem in storage stability.
[0006]
[Means for Solving the Problems]
In the present invention, A agent comprising a composition containing 0.1 to 10% by mass of hydrogen peroxide and water, and B agent comprising a composition containing an alkali agent and water, A agent and B agent The present invention relates to a two-component liquid bleaching agent filled in a container for separating and holding the two-component liquid bleaching agent satisfying the following (I) and (II).
(I) The pH of agent A is 1 to 6.5 at 20 ° C., and the amount of 0.1 N aqueous sodium hydroxide solution required to bring the pH of agent A 1000 ml to 7 at 20 ° C. is 50 to 1000 ml. is there.
(II) The pH of the B agent is 9 to 12 at 20 ° C., and the amount of 1N aqueous sulfuric acid solution required to bring the pH of 1000 ml of the B agent to 7 at 20 ° C. is 450 to 2000 ml.
[0007]
The two-component liquid bleaching agent of the present invention preferably further satisfies the following (III). (III) The pH of the mixed solution obtained by mixing the A agent and the B agent in a mass ratio of 1/3 to 3/1 is 8.5 or more at 20 ° C. in any of the mass ratio ranges. .
[0008]
The present invention also relates to a bleaching method in which the A agent and the B agent are mixed at a mass ratio of 1/3 to 3/1 and then contacted with an object.
[0009]
The bleaching agent in the present invention includes not only a bleaching agent as a detergent auxiliary agent but also a use as an independent cleaning agent.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
<A agent>
The agent A of the present invention contains 0.1 to 10% by mass of hydrogen peroxide, preferably 0.5 to 6% by mass, particularly preferably 1 to 6% by mass, and water. If hydrogen peroxide is within this range, a satisfactory bleaching effect can be obtained.
[0011]
The pH at 20 ° C. of agent A is 1 to 6.5, preferably 1.5 to 5, more preferably 2 to 5 from the viewpoint of the bleaching effect and storage stability, and 1000 ml of agent A at 20 ° C. The amount of 0.1N aqueous sodium hydroxide solution required to bring the pH of the solution to 7 is 50 to 1000 ml, preferably 100 to 1000 ml, more preferably 150 to 600 ml. Within this range, the storage stability is excellent and the bleaching effect is high.
[0012]
In this invention, it is preferable to mix | blend the following acid agent in order to provide the said property (I) to A agent.
[0013]
Here, the acid agent referred to in the present invention is preferably a substance that dissolves 1 g or more in 1 L ion-exchanged water at 20 ° C. and has a pH of 5 or less at 20 ° C. at a concentration of 1 g / 1 L. In addition, a preferable acid agent in the present invention is an acid dissociation constant pK in water._aIs a compound having two or more steps within the range of 1-8. Here, the acid dissociation constant referred to in the present invention is as described in pages II-338 to II-342 of “Chemical Handbook Basic Edition II” (revised edition 3, edited by the Chemical Society of Japan).
[0014]
As a particularly preferred acid agent,
(1) Phosphoric acid compounds such as phosphoric acid, tripolyphosphoric acid, phytic acid (inosinic acid)
(2) Phosphonic acid, ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and its derivatives, ethanehydroxy-1,1,2 -Phosphonic acid compounds such as triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, aminopoly (methylenephosphonic acid)
(3) Phosphonopolycarboxylic acid compounds such as 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid, and α-methylphosphonosuccinic acid
(4) Aminopolycarboxylic acids such as ethylenediaminediacetic acid, hydroxyethyliminodiacetic acid, iminodiacetic acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, glycol etherdiaminetetraacetic acid, triethylenetetraminehexaacetic acid, and genolic acid Compounds
(5) Amino acids such as aspartic acid, glutamic acid and glycine
(6) Citric acid, succinic acid, maleic acid, phthalic acid, terephthalic acid, isophthalic acid, fumaric acid, adipic acid, azelaic acid, diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, citric acid, lactic acid, tartaric acid, Organic acids such as oxalic acid, glutaric acid, malic acid, gluconic acid, carboxymethyl succinic acid, carboxymethyl tartaric acid
Is mentioned.
[0015]
In the present invention, the acid agent is preferably used in the A agent in a ratio of 0.2 to 10% by mass, more preferably 0.2 to 5% by mass, and particularly preferably 0.2 to 3% by mass.
[0016]
The water used for the agent A of the present invention is preferably distilled water or ion exchange water. The content of water is preferably 50 to 99% by mass and more preferably 60 to 95% by mass in the agent A.
[0017]
In the present invention, an alkali agent may be further added to the agent A as long as it does not deviate from the property (I). The alkali agent can use what was mentioned by the below-mentioned B agent.
[0018]
<B agent>
The B agent of the present invention contains an alkali agent and water, and the pH at 20 ° C. is 9 to 12, preferably 9.5 to 11.5, particularly preferably 10 to 11. Within this range, a satisfactory bleaching effect and storage stability can be obtained. Further, the amount of 1N sulfuric acid aqueous solution necessary for adjusting the pH of 1000 ml of B agent to 7 at 20 ° C. is 450 to 2000 ml, preferably 450 to 1500 ml, more preferably 500 to 1000 ml. Within this range, the storage stability is excellent and the bleaching effect is high.
[0019]
As an alkaline agent for imparting such properties to the B agent, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, monoethanolamine, diethanolamine, triethanolamine, trisodium phosphate, disodium hydrogen phosphate One or more selected from sodium tetraborate can be used, and in particular, the B agent is preferably one or more selected from sodium carbonate, potassium carbonate, and monoethanolamine. These alkali agents are preferably contained in the B agent in an amount of 3 to 20% by mass, more preferably 3.5 to 15% by mass, and particularly preferably 4 to 10% by mass.
[0020]
The water used for the B agent of the present invention is preferably distilled water or ion exchange water. The content of water is preferably 30 to 99% by mass and more preferably 50 to 95% by mass in the B agent.
[0021]
Moreover, in order to achieve the property of said (II), B agent may mix | blend an acid agent as needed other than the said alkali agent. The acid agent can use what was mentioned by the above-mentioned A agent.
[0022]
<Other ingredients>
In the present invention, a surfactant is preferably added to the agent A and / or the agent B for the purpose of enhancing the bleaching washing effect. The surfactant is preferably at least one selected from nonionic surfactants, cationic surfactants, anionic surfactants or amphoteric surfactants.
[0023]
As a nonionic surfactant, the compound of General formula (1) is preferable.
R¹-T-[(R²O)_a-H]_b      (1)
[In the formula, R¹Is an alkyl or alkenyl group having 10 to 18 carbon atoms, preferably 10 to 16 carbon atoms, and R²Is an alkylene group having 2 or 3 carbon atoms, preferably an ethylene group. a represents a number of 2 to 20, preferably 4 to 15, particularly preferably 5 to 10. T is —O—, —CON— or —N—. When T is —O—, b is 1, and when T is —CON— or —N—, b is 2. ]
Specific examples of the compound of the general formula (1) include the following compounds.
R¹-O- (C₂H_FourO)_r-H (1-a)
[In the formula, R¹Indicates the above meaning. r is a number of 4 to 15, preferably 5 to 10. ]
R¹-O- (C₂H_FourO)_s-(C_ThreeH₆O)_t-H (1-b)
[In the formula, R¹Indicates the above meaning. s and t are each independently a number of 2 to 15, preferably 2 to 10, and ethylene oxide and propylene oxide may be random or block adducts. ]
[0024]
[Chemical 1]

[0025]
[In the formula, R¹Indicates the above meaning. The sum of u and v is a number from 3 to 20, preferably from 3 to 15, particularly preferably from 2 to 10. ].
[0026]
Among these, a nonionic surfactant selected from (1-a) or (1-b) is particularly preferable in the present invention.
[0027]
As the cationic surfactant, a mono long chain alkyl (or alkenyl) tri short chain alkyl type cationic surfactant represented by the following general formula (2) is preferable.
[0028]
[Chemical formula 2]

[0029]
[In the formula, R^ThreeIs an alkyl or alkenyl group having 8 to 18 carbon atoms, preferably 10 to 18 carbon atoms, particularly preferably 10 to 16 carbon atoms, and R^Four, R^Five, R⁶Are the same or different alkyl groups having 1 to 3 carbon atoms. X^-Is an anion, preferably a halogen ion, an alkyl sulfate ion having 1 to 3 carbon atoms, a fatty acid ion having 1 to 12 carbon atoms, or an aryl sulfone optionally having 1 to 3 substituents having 1 to 3 carbon atoms It is an acid ion. ].
[0030]
Examples of the anionic surfactant include an alkyl group or an alkenyl group having 10 to 18 carbon atoms, preferably 10 to 16 carbon atoms, particularly preferably 10 to 15 carbon atoms in the molecule, and —SO 2._ThreeM group and / or -OSO_ThreeAn anionic surfactant having an M group [M: counter ion] is preferred. Specifically, alkylbenzene sulfonic acid, alkyl (or alkenyl) sulfate, polyoxyalkylene alkyl (or alkenyl) ether sulfate having the above carbon number, olefin sulfonic acid, alkane sulfonic acid, α-sulfo fatty acid, α-sulfo fatty acid Esters and their salts are preferred. Among these, an alkyl (or alkenyl) sulfate ester having an alkyl group or alkenyl group having 10 to 16 carbon atoms, an alkyl group or alkenyl group having 10 to 16 carbon atoms, and ethylene oxide (hereinafter referred to as EO) average Polyoxyethylene alkyl (or alkenyl) ether sulfate having an addition mole number of 1-6, preferably 1-4, particularly preferably 1-3, alkylbenzenesulfonic acid having an alkyl group of 10-15 carbon atoms, and these It is preferable to blend one or more selected from these salts. As the salt, sodium salt, potassium salt, ammonium salt and alkanolamine salt are preferable from the viewpoint of storage stability.
[0031]
As the amphoteric surfactant, a compound selected from the compound represented by the following general formula (3) or the compound represented by the general formula (4) is preferable.
[0032]
[Chemical 3]

[0033]
[In the formula, R⁷Is a linear alkyl group or alkenyl group having 8 to 16, preferably 10 to 16, and particularly preferably 10 to 14 carbon atoms, and R⁸, R⁹Are each an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group. R^TenIs an alkylene group having 1 to 5 carbon atoms, preferably 2 or 3 carbon atoms. A is a group selected from —COO—, —CONH—, —OCO—, —NHCO—, and —O—, and c is a number of 0 or 1, preferably 1. ]
[0034]
[Formula 4]

[0035]
[In the formula, R¹¹Is an alkyl or alkenyl group having 9 to 23 carbon atoms, preferably 9 to 17 carbon atoms, particularly preferably 10 to 16 carbon atoms, and R¹²Is an alkylene group having 1 to 6, preferably 1 to 4, and particularly preferably 2 or 3, carbon atoms. B is a group selected from —COO—, —CONH—, —OCO—, —NHCO—, and —O—, and d is a number of 0 or 1, preferably 0. R¹³, R¹⁴Are each an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group, preferably a methyl group, an ethyl group or a hydroxyethyl group, and R¹⁵Is an alkylene group having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms which may be substituted with a hydroxy group. D is -SO_Three ^-, -OSO_Three ^-, And in particular —SO_Three ^-Is preferable from the viewpoint of bleaching washing effect. ].
[0036]
The agent A of the present invention preferably contains a nonionic surfactant in an amount of 0.5 to 15% by mass, more preferably 1 to 10% by mass, from the viewpoint of bleaching washing effect, and the cationic surfactant is preferably added in an amount of 0.001. It is preferable to contain 1-2 mass%, and further 0.1-1 mass%, and it is suitable to contain amphoteric surfactant 0-10 mass%, and also 0.1-5 mass%.
[0037]
Moreover, it is suitable for B agent of this invention to contain 0-40 mass%, and also 1-35 mass% of nonionic surfactant from the point of a cleaning effect, and 0-30 of anionic surfactant is contained. It is preferable to contain 0.1 mass%, and further 0.1-10 mass%. Moreover, it is suitable to contain 0-15 mass% of amphoteric surfactant, Furthermore, 0.5-5 mass%, 0-10 mass% of cationic surfactant, Furthermore, 0.1-5 mass% is contained. It is preferable to do.
[0038]
In the present invention, a homopolymer obtained by polymerizing acrylic acid, methacrylic acid, or maleic acid, or a monomer thereof, for the purpose of improving detergency to agent A and / or agent B, or these monomers It is preferable to blend a carboxylic acid polymer such as a copolymer with another monomer copolymerizable with the carboxylic acid.
[0039]
The weight average molecular weight of these carboxylic acid polymers is preferably 3,000 to 100,000, more preferably 5,000 to 80,000. The weight average molecular weight can be determined by gel permeation chromatography using polyethylene glycol as a standard substance.
[0040]
Further, such a carboxylic acid-based polymer may be in the form of a salt partially and / or entirely neutralized with an alkali agent. As the alkali agent, a compound containing an alkali metal such as sodium or potassium is preferable.
[0041]
Specifically, preferably sodium polyacrylate (or potassium) or polysodium methacrylate (or potassium) having a weight average molecular weight of 3,000 to 30,000, or preferably a weight average molecular weight of 20,000 to 100,000, More preferably, a sodium salt (or potassium salt) of an acrylic acid-maleic acid copolymer of 50,000 to 80,000 is good. In the case of an acrylic acid-maleic acid copolymer, acrylic acid / maleic acid is preferably 5/5 to 9/1, more preferably 6/4 to 8/2, in terms of cleaning effect.
[0042]
In the present invention, the content of the carboxylic acid polymer in the agent A is preferably 0 to 10% by mass, more preferably 0.1 to 7% by mass, and in the agent B, preferably 0.5 to 10%. It is 1 mass%, More preferably, it is 1-8 mass%.
[0043]
The agent A of the present invention preferably contains a bleach activator for enhancing the bleaching effect. As the bleach activator, an alkanoyloxybenzene type bleach activator is preferable from the viewpoint of bleaching effect and storage stability, and in particular, an alkanoyloxybenzenesulfonic acid or carbon having an alkanoyl group having 6 to 14 carbon atoms, preferably 7 to 13 carbon atoms. An alkanoyloxybenzenecarboxylic acid having an alkanoyl group of 6 to 14, preferably 7 to 13, or a salt thereof is preferred. Specific preferred examples include octanoyloxy-p-benzenesulfonic acid, nonanoyloxy-p-benzenesulfonic acid, 3,5,5-trimethylhexanoyloxy-p-benzenesulfonic acid, decanoyloxy-p-benzenesulfone. Acid, dodecanoyloxy-p-benzenesulfonic acid, octanoyloxy-o- or -p-benzenecarboxylic acid, nonanoyloxy-o- or -p-benzenecarboxylic acid, 3,5,5-trimethylhexanoyloxy-o -Or -p-benzenecarboxylic acid, decanoyloxy-o- or -p-benzenecarboxylic acid, dodecanoyloxy-o- or -p-benzenecarboxylic acid, and salts thereof. As the salt, sodium salt, potassium salt, and magnesium salt are preferable, and sodium salt is particularly preferable from the viewpoint of solubility.
[0044]
Among these, nonanoyloxy-p-benzenesulfonic acid, decanoyloxy-p-benzenecarboxylic acid, dodecanoyloxy-p-benzenesulfonic acid and salts thereof are particularly preferred from the viewpoint of lipophilic soil bleaching effect. It is preferable from the point of the bleaching effect to mix | blend a bleaching activator with A-5 of this invention 0.05-5 mass%, Preferably 0.1-1 mass%.
[0045]
It is preferable to mix | blend a solvent with the B agent of this invention in order to improve a cleaning effect. As the solvent, (1) a monohydric alcohol having 1 to 5 carbon atoms, (2) a polyhydric alcohol having 2 to 12 carbon atoms, (3) a compound represented by the following general formula (5), (4) A compound represented by the general formula (6) and a compound represented by the following general formula (7) are preferred.
[0046]
[Chemical formula 5]

[0047]
[In the formula, R¹⁶And R¹⁷Each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group,¹⁶And R¹⁷Except when both are hydrogen atoms. g represents a number from 0 to 10, and h represents a number from 0 to 10, except when both g and h are 0. R¹⁸And R¹⁹Each represents an alkyl group having 1 to 3 carbon atoms. R²⁰Represents an alkyl group having 1 to 8 carbon atoms. ].
[0048]
Examples of (1) monohydric alcohol having 1 to 5 carbon atoms generally include ethanol, propyl alcohol, and isopropyl alcohol. By blending these lower alcohols, the stability of the system at low temperatures can be further improved.
[0049]
(2) Polyhydric alcohol having 2 to 12 carbon atoms isoprene glycol, 2,2,4-trimethyl-1,3-pentanediol, 1,8-octanediol, 1,9-nonanediol, ethylene glycol , Propylene glycol, diethylene glycol, dipropylene glycol, glycerin and the like.
[0050]
The compound of (3) is represented by R in general formula (5)¹⁶, R¹⁷As for carbon number when is an alkyl group, 1-4 are especially preferable. Moreover, in general formula (5), g and h of the average addition mole number of EO and a propylene oxide are the numbers of 0-10 respectively (except when the case where both g and h are 0), The order of addition is not particularly limited, and may be randomly added. Specific examples of the compound (3) include ethylene glycol monobutyl ether, dipropylene glycol dimethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monobutyl ether, propylene glycol monoethyl ether, propylene glycol dimethyl ether, Polyoxyethylene (p = 2 to 3) polyoxypropylene (p = 2 to 3) glycol dimethyl ether (p represents the average number of moles added), polyoxyethylene (p = 3) glycol phenyl ether, phenyl carbitol, phenyl Examples include cellosolve and benzyl carbitol. Among these, propylene glycol monomethyl ether, diethylene glycol monobutyl ether, and polyoxyethylene (p = 1 to 4) glycol monophenyl ether are preferable from the viewpoint of detergency and usability.
[0051]
Examples of the compound (4) include 1,3-dimethyl-2-imidazolidinone and 1,3-diethyl-2-imidazolidinone, and examples of the compound (5) include alkyl glyceryl. Ether compounds are exemplified as preferred, preferably R²⁰Is a compound of an alkyl group having 3 to 8 carbon atoms.
[0052]
Among these, the water-soluble solvents (1), (2), (3), and (5) are preferable in order to satisfy the properties of the present invention, and ethanol, isopropyl alcohol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene are particularly preferable. A solvent selected from glycol, glycerin, isoprene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, pentyl glyceryl ether, octyl glyceryl ether, and polyoxyethylene (p = 1 to 4) glycol monophenyl ether is preferred.
[0053]
The agent B of the present invention preferably contains 0 to 20% by mass, and further 5 to 20% by mass of such a solvent.
[0054]
In the present invention, the above-mentioned agent A and agent B are mixed and bleached and washed, and even when the mixing ratio during use varies, it is preferable from the viewpoint of bleaching effect that the pH is high. Therefore, in the present invention, as agent A and agent B, agent A / agent B = 1/3 to 3/1, further 1/5 to 5/1, particularly 1/10 to 10/1 in a mass ratio. A solution having a pH of 8.5 or more at 20 ° C. is used in any of the above mass ratio ranges. The pH is preferably 8.8 or more, more preferably 9.5 or more, particularly preferably 9.8 or more, and the upper limit is preferably 11.5 or less, more preferably 11 or less. When the pH of the mixed solution is within the above range at any mixing ratio, it has a sufficient bleaching effect.
[0055]
Further, in order to obtain a better bleaching effect, A agent and B agent are in a mass ratio of A agent / B agent = 1/3 to 3/1, more preferably 1/5 to 5/1, particularly 1/10 to 10. The pH at 20 ° C. of a solution obtained by diluting the mixed solution mixed in the range of / 1 with water so as to be 0.1% by mass is 8.5 or more and further 8.8 in any of the mass ratio ranges. The upper limit is preferably 11.5 or less, and more preferably 11 or less.
[0056]
From the above, in the two-component liquid bleaching agent of the present invention, the mixing ratio of the A agent and the B agent at the time of use is A agent / B agent = 1/3 to 3/1, and further 1/5 in mass ratio. It is preferable from the viewpoint of the bleaching washing effect to design the composition of the A agent and the B agent and the container so as to be 5/1, particularly 1/10 to 10/1.
[0057]
In order to obtain better stability and bleaching effect, the amount of 0.1N sodium hydroxide aqueous solution necessary to bring the pH of 1000 ml of agent A to 7 at 20 ° C. is X (ml), and at 20 ° C. Assuming that the amount of 1N sulfuric acid aqueous solution necessary for adjusting the pH of 1000 ml of B agent to 7 is Y (ml), the relationship between X and Y is (Y / 10) <X <Y × (10/3) It is preferable that there is (Y / 10) <X <Y.
[0058]
The viscosity at 20 ° C. is preferably 3 to 300 mPa · s, more preferably 4 to 200 mPa · s for both agent A and agent B, from the viewpoint of ease of use. In order to adjust to such a viscosity, in this invention, a viscosity modifier can be mix | blended with A agent and / or B agent. As the viscosity modifier, an alkyl group having 1 to 3 carbon atoms, benzenesulfonic acid which may be substituted with 1 to 3 hydroxy groups, polyethylene glycol or polypropylene glycol having a molecular weight of 3000 to 100,000 can be used. The content of such a viscosity modifier is preferably 0 to 10% by mass, more preferably 0.01 to 5% by mass in the agent A and / or the agent B.
[0059]
Furthermore, the B agent of the present invention preferably contains a sequestering agent. Examples of the sequestering agent used in the present invention include the following (i) to (viii), among which at least one selected from (ii), (v), (vi) and (vii) And at least one selected from (ii) is more preferable.
(I) Alkali metal salts or alkanolamine salts of phosphate compounds such as phytic acid
(Ii) ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid and its derivatives, ethanehydroxy-1,1,2-triphosphonic acid , Alkali metal salts or alkanolamine salts of phosphonic acids such as ethane-1,2-dicarboxy-1,2-diphosphonic acid and methanehydroxyphosphonic acid
(Iii) Alkali metal salts or alkanolamine salts of phosphonocarboxylic acids such as 2-phosphonobutane-1,2-dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid and α-methylphosphonosuccinic acid
(Iv) Alkali metal salts or alkanolamine salts of amino acids such as aspartic acid, glutamic acid and glycine
(V) Alkali metal salts or alkanolamines of aminopolyacetic acids such as nitrilotriacetic acid, iminodiacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, glycol etherdiaminetetraacetic acid, hydroxyethyliminodiacetic acid, triethylenetetraminehexaacetic acid, diencoric acid salt
(Vi) Alkali metals of organic acids such as diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, citric acid, lactic acid, tartaric acid, oxalic acid, malic acid, oxydisuccinic acid, gluconic acid, carboxymethylsuccinic acid, carboxymethyltartaric acid Salt or alkanolamine salt
(Vii) Aluminosilicate alkali metal salt or alkanolamine salt represented by zeolite A
(Viii) An alkali metal salt or alkanolamine salt of aminopoly (methylenephosphonic acid), or an alkali metal salt or alkanolamine salt of polyethylenepolyaminepoly (methylenephosphonic acid).
[0060]
The content of such a sequestering agent is preferably 0 to 5% by mass, more preferably 0.01 to 1% by mass in the B agent.
[0061]
In addition to the above components, known components that are usually added to bleaching agents can be added to the A agent and / or B agent of the present invention. For example, it is preferable to use a known magnesium salt such as magnesium sulfate, magnesium silicate, magnesium chloride, magnesium silicofluoride, magnesium oxide, magnesium hydroxide, or a silicate such as sodium silicate as a hydrogen peroxide stabilizer. Furthermore, it is preferable to add a recontamination preventive agent such as carboxymethylcellulose, polyvinylpyrrolidone, and polyethylene glycol as necessary.
[0062]
Further, the A agent and / or B agent of the present invention may further contain various compounds. For example, phosphoric acid, barbituric acid, uric acid, acetanilide, aminopolycarboxylic acids typified by oxyquinoline and phenacetin, and DL-α-tocopherol, gallic acid derivatives, which are known as hydrogen peroxide stabilizers It is preferable to add butylated hydroxyanisole (BHA), 2,6-di-tert-butyl-4-methylphenol (BHT) or the like. These stabilizers are preferably contained in the agent A and / or the agent B, usually about 0 to 5% by mass, more preferably 0.01 to 3% by mass.
[0063]
The agent A and / or agent B of the present invention preferably contains materials known as anti-fading agents. Such substances can be copolymerized with amino acids and amino acid salts such as phenylalanine, histidine, lysine, tyrosine, methionine, and amino or imide compounds such as hydroxyiminodiacetic acid, and also with acrylonitrile and acrylonitrile having a quaternary ammonium group. A copolymer of one kind or two or more kinds of monomers. Although amino acids have optical isomers, optical isomers are not involved in the effects of the present invention. It is therefore possible to use chemically synthesized amino acids.
[0064]
In addition, the A agent and / or the B agent of the present invention include, as fluorescent brighteners, Tinopearl CBS (manufactured by Ciba-Geigy), Tinopearl SWN (manufactured by Ciba-Geigy), If necessary, fluorescent brighteners such as color index fluorescent brighteners 28, 40, 61, 71, and conventionally known enzymes (cellulase, amylase, protease, lipase) are used to improve bleaching performance. It is preferable to mix.
[0065]
Moreover, it is preferable to mix | blend appropriate amounts of various trace additives, such as coloring agents, such as a dye and a pigment, a fragrance | flavor, silicones, a disinfectant, and an ultraviolet absorber, with the A agent and / or B agent of this invention.
[0066]
Moreover, the well-known component normally added besides the said component can be added. It is preferable to add a hydrotrope for the purpose of improving the stability and freezing / restoring property of the liquid at a low temperature or preventing liquid separation at a high temperature. As such a hydrotrope, generally, a short-chain alkylbenzene sulfonate represented by toluene sulfonate, xylene sulfonate, etc., ethanol, ethylene glycol, propylene glycol, hexylene glycol, glycerin, etc. Representative alcohols and polyhydric alcohols are preferred. It is preferable to mix about 0 to 30% by mass of the hydrotrope agent in the agent A and / or agent B.
[0067]
The two-component liquid bleaching agent of the present invention is a detergent for clothing, a bleaching aid for clothing, a coating detergent for clothing, cutting boards, tea cups, kitchen bleaches such as a sink, dishwashing detergent, bath, wall, carpet It is preferably used for an application selected from bleach detergents for use. Moreover, it is more preferable to use it for bleach washing of clothing.
[0068]
The two-component liquid bleaching agent of the present invention can be bleached by immersing clothes in an aqueous solution (preferably 0.05 to 30% by mass) in which agent A and agent B are dissolved in tap water in advance. The two-component liquid bleach of the present invention can also be used by mixing with a conventionally known garment detergent. It is also preferable to warm the agent A and / or agent B to 30 to 50 ° C. during bleaching.
[0069]
Further, in washing in a normal washing machine, the two-component liquid bleach of the present invention can be used by mixing with a conventionally known garment detergent.
[0070]
In addition, the two-component liquid bleach of the present invention can be used in a bleaching method in which it is directly applied to clothing and left standing, followed by washing with water. In addition, after being directly applied to clothing and allowed to stand, it can also be used by mixing with a conventionally known clothing detergent by washing in a normal washing machine. The standing time after coating is preferably 0 to 180 minutes, and more preferably 1 to 60 minutes.
[0071]
When the two-component liquid bleach of the present invention is used as a detergent for clothing, the two-component liquid bleach of the present invention can be used for washing in a normal washing machine, or It is also possible to carry out washing in a normal washing machine after directly applying and leaving.
[0072]
For the two-component liquid bleaching agent of the present invention, it is preferable to use a container equipped with a discharge part capable of discharging agent A and agent B at the same time, particularly for the purpose of easily achieving the mixing ratio as described above. The container can separate and hold the A agent and the B agent, for example, an integrated container that can store the A agent and the B agent in different storage units, a container that can store the A agent, and the B agent. Examples include a connected container in which a container that can be stored is joined by an appropriate member. Particularly, the opening area of the discharge part of the container used in the present invention is 1/10 to 10/1, more preferably 1/5 to 5/1, particularly 1/3 in the area ratio of the agent A discharge part and the agent B discharge part. ˜3 / 1 is preferable for adjusting the discharge amount. The adjustment of the discharge amount can be achieved by a known method by adjusting the viscosity of the A agent and the B agent and the opening area and shape of the discharge part. A schematic diagram of a specific container is shown in FIGS. In FIG. 1, (11) and (12) are storage parts for agent A or agent B, and agent A is stored in one and agent B is stored in the other. Each container is separated by the partition wall (13), and the agent A and the agent B are separated and held in the container. (14) is a discharge unit that simultaneously discharges the A agent and the B agent. Moreover, in FIG. 2, (21) and (22) are the storage part of A agent or B agent, and A agent is accommodated in one side and B agent is accommodated in the other. These are joined at the joint of (23). (24) is a discharge unit that discharges agent A and agent B simultaneously.
[0073]
Moreover, it is preferable that the container used for this invention uses the cap (1-1) and (2-1) which can measure A agent and B agent like FIGS. By using such a cap, it becomes possible to act on the dirt after mixing both in the step of measuring the agent A and agent B, and high bleaching performance can be obtained.
[0074]
【Example】
The A agent shown in Table 1 and the B agent shown in Table 2 are filled in the container shown in FIG. 1 or 2 in the combination shown in Table 3 to prepare a two-component liquid bleaching agent. Evaluation was made by the following method. The results are shown in Table 3. The containers used are as follows.
[0075]
In addition, pH in Tables 1 and 2 is a value measured at 20 ° C., and was adjusted using a 10% by mass sulfuric acid aqueous solution or a 30% by mass NaOH aqueous solution.
[0076]
Moreover, the pH of the liquid mixture in Table 3 is a value obtained by measuring the pH of the liquid mixture obtained by mixing the agent A and the agent B so that the mass ratio of agent A / agent B = 3/1 at 20 ° C. is there. In Examples 1 to 4, the pH of the mixed solution obtained by mixing the A agent and the B agent in a mass ratio of 1/3 to 3/1 is 20 ° C. in any of the mass ratio ranges. It was 8.5 or more.
[0077]
Further, in Tables 1 and 2, the amount of 0.1 N sodium hydroxide aqueous solution necessary to bring the pH of 1000 ml of A agent to 7 at 20 ° C. (hereinafter referred to as 0.1 N NaOH required amount of A agent), And the amount of 1N aqueous sulfuric acid solution required to bring the pH of 1000 ml of B agent to 7 at 20 ° C. (hereinafter referred to as 1N H of B agent)₂SO_FourThe result of measuring the required amount) by the following method is also shown.
[0078]
<Container 1>
1. A polyethylene container having a shape of FIG. 1, a main body having a diameter of 9 cm, a height of 22 cm, a neck having a diameter of 3.5 cm, and a cap having a diameter of 3.5 cm and a height of 3 cm.
[0079]
<Container 2>
In the shape of FIG. 2, the outer container part has a diameter of 7 cm, a height of 26 cm, the neck part has a diameter of 3.5 cm, the inner container part has a diameter of 4 cm, the height of 25 cm, the neck part has a diameter of 0.9 cm, and the cap part has a diameter of A polyethylene container having a height of 3.5 cm and a height of 5 cm. The agent A was filled in the accommodating part (21) (outer container), and the agent B was filled in the accommodating part (22) (inner container).
[0080]
<Storage stability>
From the two-component liquid bleaching agent in Table 3, the mixture of agent A and agent B was poured into the cap, and then the mixture of the cap was discharged. Here, the ratio of agent A and agent B in the mixed solution is as shown in Table 3, and the total discharge amount was 25 ml for container 1 and 40 ml for container 2. Thereafter, the container was immediately sealed with a cap and left at room temperature (23 ° C.) for 2 hours. After repeating this operation 5 times, the container was stored in a constant temperature room at 40 ° C. with the cap sealed. After storage for 4 weeks, the appearance of the container was visually determined according to the following criteria.
No swelling of the container is seen ... 5
Slightly swollen container ... 4
The container is swollen ... 3
The container is significantly swelled ... 2
Container is damaged ... 1
The average of 5 samples was obtained, and the average score was determined to be 4 or more, ◯, 3 or more and less than 4 as □, 2 or more and less than 3 as Δ, and less than 2 as x.
[0081]
<Bleaching effect>
From the two-component liquid bleaching agent in Table 3, the A agent and the B agent were discharged so that the total amount was 1 ml (the ratio of the A agent and the B agent was as shown in Table 3). Oily stains) were applied one by one to 4 sheets and allowed to stand for 5 minutes. Thereafter, it was put into a commercial detergent aqueous solution having a concentration of 0.0667% by mass, washed normally with a targotometer (80 rpm × 10 minutes), rinsed with tap water and dried, and the bleaching rate was calculated by the following formula.
[0082]
[Expression 1]

[0083]
The reflectance was measured with ND-300A manufactured by Nippon Denshoku Industries Co., Ltd. using a 460 nm filter.
[0084]
<Preparation of curry-contaminated cloth>
After removing the solid content of the house food retort curry (curry marche) with a mesh, the resulting liquid was heated until boiling. Cotton gold cloth # 2003 was immersed in this solution and boiled for about 15 minutes. After removing from the fire as it was and leaving it to stand for about 2 hours, the cloth was taken out and the curry liquid adhering to the excess was removed with a spatula and allowed to dry naturally. Thereafter, it was pressed and subjected to an experiment as a 10 cm × 10 cm test piece.
[0085]
<Measurement of the required amount of 0.1N NaOH for agent A>
1000 ml of agent A was placed in a beaker, 0.1N NaOH aqueous solution was dropped using a burette, stirred, and the pH value was measured with a pH meter (pH METER F-14, manufactured by Horiba, Ltd.). In addition, the measurement was performed in a constant temperature room at 20 ° C., with each solution and experimental equipment set at 20 ° C.
[0086]
<1 regulation H of B agent₂SO_FourMeasurement of required amount>
Take 1000ml of B agent in a beaker and 1N₂SO_FourThe aqueous solution was dropped using a burette, stirred, and the pH value was measured with a pH meter (pH METER F-14, manufactured by Horiba, Ltd.). In addition, the measurement was performed in a constant temperature room at 20 ° C., with each solution and experimental equipment set at 20 ° C.
[0087]
[Table 1]

[0088]
1) 1-hydroxyethylidene-1,1-diphosphonic acid
2) Ethylenediaminetetraacetic acid
3) Polyoxyethylene lauryl ether (EO average addition mole number 6)
4) RO (C₂H_FourO)_n(C_ThreeH₆O)_m-H (R: lauryl, n: 5, m: 3)
5) Alkyl (C12-15) sodium benzenesulfonate
6) Sodium polyoxyethylene lauryl ether sulfate (EO average addition mole number 2)
7) α-olefin (16 carbon atoms) sodium sulfonate
8) N-tetradecyl-N, N, N-trimethylammonium chloride
9) N-lauryl-N, N-dimethyl-N- (2-hydroxy-1-sulfopropyl) ammonium sulfobetaine
10) Sodium lauroyloxybenzenesulfonate
[0089]
[Table 2]

[0090]
11) Sodium polyacrylate (weight average molecular weight 10,000)
12) Sodium p-toluenesulfonate
[0091]
[Table 3]

[0092]
When the A agent / B agent discharge amount ratio is changed as shown in Table 4 for the two-agent liquid bleach prepared by combining the A agent shown in Table 1 and the B agent shown in Table 2 with the combinations shown in Table 4 The bleaching effect of was evaluated. The evaluation was performed by using the container of FIG. 2, filling 400 ml of agent A and 200 ml of agent B, and changing the discharge amount ratio by adjusting the opening area of the discharge portion. As for the bleaching effect, the bleaching rate measured by the above method was evaluated as “◯” when 65% or more, “Δ” when 40% or more and less than 65%, and “X” when less than 40%. The results are shown in Table 4.
[0093]
[Table 4]

[0094]
【The invention's effect】
The two-component liquid bleaching agent of the present invention has an appropriate buffer capacity for both the A agent and the B agent, so that it is excellent in storage stability and has a high bleaching effect even when the mixing ratio varies.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of a two-drug container containing agent A and agent B.
FIG. 2 is a schematic diagram showing another example of a two-drug container containing agent A and agent B.
[Explanation of symbols]
(11), (12): Container for A agent or B agent
(13): Bulkhead
(14): Discharge unit
(1-1): Cap

Claims (5)

A agent comprising a composition containing 0.1 to 10% by mass of hydrogen peroxide , an alkanoyloxybenzene type bleach activator and water, and a B agent comprising a composition containing an alkali agent and water, A two-component liquid bleaching agent which is a two-component liquid bleaching agent filled in a container for separating and holding the agent and the B agent, and satisfies the following (I) and (II).
(I) The pH of the agent A is 1 to 6.5 at 20 ° C., and the amount of 0.1 N sodium hydroxide aqueous solution required to bring the pH of the agent A 1000 ml to 7 at 20 ° C. is 50 to 1000 ml. is there.
(II) The pH of the B agent is 9 to 12 at 20 ° C., and the amount of 1N aqueous sulfuric acid solution required to bring the pH of 1000 ml of the B agent to 7 at 20 ° C. is 450 to 2000 ml. The two-component liquid bleaching agent according to claim 1, further satisfying the following (III).
(III) The pH of the mixed solution obtained by mixing the A agent and the B agent in a mass ratio of 1/3 to 3/1 is 8.5 or more at 20 ° C. in any of the mass ratio ranges. .   The amount of 0.1N sodium hydroxide aqueous solution X (ml) necessary to bring the pH of 1000 ml of agent A to 7 at 20 ° C., and 1 norm necessary to bring the pH of 1000 ml of agent B to 7 at 20 ° C. The two-component liquid bleaching agent according to claim 1 or 2, wherein the amount Y (ml) of the aqueous sulfuric acid satisfies (Y / 10) <X <Y × (10/3). The two-component liquid bleaching agent according to any one of claims 1 to 3, wherein the agent B contains 0.5 to 10% by mass of a carboxylic acid polymer. A bleaching method in which the agent A and the agent B according to any one of claims 1 to 4 are mixed at a mass ratio of 1/3 to 3/1 and then contacted with an object.

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