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    • 6. 发明公开
    • SEQUESTERANTS AS HYPOCHLORITE BLEACH ENHANCERS
    • SEQUESTRIERUNGSMITTELS ALSVERSTÄRKERFÜRHYPOCHLORITBLEICHMITTEL
    • EP1002037A4
    • 2000-05-24
    • EP97922549
    • 1997-05-01
    • CLOROX CO
    • KAARET THOMAS WSMITH WILLIAM L
    • C11D7/54C11D3/37C11D3/395D06L3/08
    • C11D3/3956C11D3/3765
    • Sequestering agents for use as a whitening and fabric strength enhancer for aqueous hypochlorite bleach compositions are provided. It was found that the sequesterants when used with hypochlorite in the presence of soluble heavy metal ions, particularly iron and manganese ions, provide significantly improved whitening and fabric protection. Most preferably, the sequesterants are selected from polyacrylic acid, a polyacrylic acid derivative, a copolymer of acrylic acid or methacrylic acid and a comonomer which is maleic acid or maleic anhydride and mixtures thereof. In one aspect, the sequesterants are employed in a method for laundering fabrics comprising: a) providing, in a wash liquor containing (i) at least about 40 ppb of iron cations or (ii) at least about 10 ppb of manganese cations, or (iii) the cations of both (i) and (ii), and a fabric piece; and b) adding either prior to, contemporaneously with, or after, the step of providing of said fabric piece to said wash liquor a hypochlorite composition which comprises one or more of said sequesterants. Preferably the sequesterant comprises at least 0.1 ppm by weight of said wash liquor and the hypochlorite composition is an alkali metal hypochlorite and said sequesterant has a molecular weight of between about 500 and 500,000 daltons.
    • 提供了用作含水次氯酸盐漂白剂组合物的增白剂和织物强度增强剂的螯合剂。 发现当在可溶性重金属离子,特别是铁离子和锰离子存在下与次氯酸盐一起使用时,螯合剂提供了显着改善的增白和织物保护。 最优选地,螯合剂选自聚丙烯酸,聚丙烯酸衍生物,丙烯酸或甲基丙烯酸与马来酸或马来酸酐共聚单体及其混合物的共聚物。 在一个方面,螯合剂用于洗涤织物的方法中,该方法包括:a)在含有(i)至少约40ppb的铁阳离子或(ii)至少约10ppb的锰阳离子的洗涤液中,或 (iii)(i)和(ii)的阳离子以及织物片; 和b)在向所述洗涤液提供包含一种或多种所述螯合剂的次氯酸盐组合物的所述织物片的步骤之前,同时或之后添加。 优选地,螯合剂包含至少0.1重量ppm的所述洗涤液,次氯酸盐组合物是碱金属次氯酸盐,并且所述螯合剂具有约500至500,000道尔顿的分子量。