(Co)poly-.alpha.-hydroxyacrylic-acid-based polymers (P), optionally in lactonized form or in salt form, optionally as Mg-complexes, and which are characterized by a content in carbohydrate units and 2-hydroxy-2-carboxyethylene-1,2 monomer units, are suitable as biologically degradable, alkali-resistant stabilizers for peroxide bleaching agents.

(os polímeros de Co)poly-.alpha.-hydroxyacrylic-acid-based (p), opcionalmente em lactonized o formulário ou no formulário de sal, opcionalmente como Magnésio-complexos, e que são caracterizadas por um índice em unidades do hidrato de carbono e em unidades do monomer 2-hydroxy-2-carboxyethylene-1,2, seja apropriado como estabilizadores biològica degradable, alcalóide-resistentes para agentes descorando-se do peroxide.

 
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