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US 6,605,182 B1Granted
Polymers, their preparation and their use
AssigneeClariant Finance (BVI) Limited
InventorBernard Danner
Life of this patent
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Abstract
(Co)poly-α-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.
Claims27
A water soluble alkali metal salt of (co)poly-α-hydroxyacrylic acid based polymer made by free radical polymerization in acidic medium followed by reaction with a base and comprising;
- (s) at least one carbohydrate unit;
- and,
- (a) at least one unit which is an alkali metal salt of 2-hydroxy-2-carboxylic acid ethylene-1,2-unit;
- and optionally
- (b) a unit (b), which is a unit derived from polymerization of an α,β-ethylenically unsaturated aliphatic carboxylic acid monomer having 3 to 6 carbon atoms, and
- further where unit denoted as (s) in the polymer ranges from 16 mole % to 67 mole %.
3 more elements
Dependencies are inferred from the claim text.