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EP0427349A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for the preparation of polydicarboxysaccharides

Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1990-11-08
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Granted: —
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Expires: 2010-11-08
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Abstract

Abstract A method for the preparation of polydicarboxysaccharides is provided wherein polysaccharides, such as starch and starch derivatives, are oxidised in the presence of hypobromite and/or hypoiodite and a low oxidising agent concentration is maintained during the oxidation reaction. The low concentration of oxidising agent can be maintained by adding the oxidising agent during the oxidation reaction. The hypo­bromite or hypoiodite is preferably formed in the reaction medium by oxidation of a catalytic amount of bromide or iodide, either by addition of hypochlorite or by passing an electric current. The product obtained by the method has good calcium and magnesium binding properties and is biodegradable, and thus it is very suitable for use as a builder in detergent compositions.

Inventors

  • 👤 Arie Cornelis Besemer

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 14:24
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/22; C11D3/222; C11D3/223; C08; C08B; C08B31/00; C08B31/18; C08B33/00; C08B33/08

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 49 words
Method for the preparation of polydicarboxysaccharides by oxidation of polysaccharides in the presence of a hypohalite as oxidising agent in a reaction medium, characterized in that the polysaccharides are oxidised in the presence of hypobromite and/or hypoiodite and a low oxidising agent concentration is maintained during the oxidation reaction.
Claim 2
Dependent Claim 49 words
Method for the preparation of polydicarboxysaccharides by oxidation of polysaccharides in the presence of a hypohalite as oxidising agent in a reaction medium, characterized in that the polysaccharides are oxidised in the presence of hypobromite and/or hypoiodite and a low oxidising agent concentration is maintained during the oxidation reaction.
Claim 3
Dependent Claim 25 words
Method according to Claim 1, characterized in that the low concentration of oxidising agent is maintained by adding the oxidising agent during the oxidation reaction.
Claim 4
Dependent Claim 26 words
Method according to Claim 1 or 2, characterized in that the hypobromite or hypoiodite is formed in the reaction medium by oxidation of bromide or iodide.
Claim 5
Dependent Claim 20 words
Method according to Claim 3, characterized in that 0.5-10 equivalents of bromide are used per 100 theoretically required oxidation equivalents.
Claim 6
Dependent Claim 18 words
Method according to Claim 3 or 4, characterized in that the bromide or iodide is oxidised with hypochlorite.
Claim 7
Dependent Claim 17 words
Method according to Claim 3 or 4, characterized in that the bromide or iodide is oxidised electrochemically.
Claim 8
Dependent Claim 27 words
Method according to one of Claims 1-6, characterized in that a temperature of at least 35°C is maintained during at least a part of the oxidation reaction.
Claim 9
Dependent Claim 23 words
Method according to one of Claims 1-7, characterized in that the polysaccharide used is a partially hydrolysed polysaccharide such as amylosedextrin or maltodextrin.
Claim 10
Dependent Claim 82 words
Method for the preparation of polydicarboxysaccharides by oxidation of polysaccharides in the presence of a hypohalite, characterized in that a polysaccharide is oxidised to a slight extent, preferably to the extent of 1-10% with respect to oxidation to polydicarboxysaccharide, with an oxidising agent, the polysaccharide oxidised to a slight extent is then partially hydrolysed if necessary, preferably to a chain length of 10-100 hexose units per mol, and the partially hydrolysed polysaccharide is then oxidised in accordance with one of Claims 1-8.
Claim 11
Dependent Claim 16 words
Calcium-binding agent for use in detergents, comprising a polydicarboxysaccharide prepared according to one of Claims 1-9.
Claim 12
Dependent Claim 14 words
Calcium-binding agent according to Claim 10, charac­terized in that it also comprises a zeolite.
Claim 13
Dependent Claim 15 words
Detergent comprising an effective amount of a calcium-­binding agent according to Claim 10 or 11.

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