Patent EP0427349A2 successfully refreshed from Google Patents.
EP0427349A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for the preparation of polydicarboxysaccharides
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
•
Filing: 1990-11-08
•
Granted: —
•
Expires: 2010-11-08
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 17:36
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.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.