Glass-like polysaccharide useful as absorbent for liquids
AssigneeGroupe Lysac Inc.
InventorsSerge Huppé, Marie-Elise Maheux, Stéphane Chevigny, François Quirion
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Abstract
A particulate absorbent, for the absorption of liquids, comprising particles selected from the group consisting of particles of glass-like polysaccharides and of particles of glass-like polysaccharides occluding, In their internal structure, at least one surfactant, said particles: having a size of up to 620 μm; being at least 70% of a glass-like type structure; and being: 30 to 45% of a size comprised between 620 and 420 μm; 35 to 55% of a size comprised between 420 and 210 μm; and 5 to 25% of a size up to 210 μm. These particulate absorbent is non-hygroscopic, hypoallergenic and biodegradable and useful particularly in biodegradable diapers.
Claims32
A particulate absorbent, for the absorption of liquids, comprising particles of glass-like polysaccharides occluding, in their internal structure, at least one surfactant, said particles:
- having a size of up to 620 μm;
- being at least 70% by weight of a glass-like type structure;
- and
- being:
- 30 to 45% by weight of a size comprised between 620 and 420 μm;
- 35 to 55% by weight of a size comprised between 420 and 210 μm;
- and
- 5 to 25% by weight of a size up to 210 μm.
A process for preparing particles of glass-like polysaccharides occluding, in their internal structure, at least one surfactant, said particles:
- having a size up to 620 μm;
- and
- being at least 70% by weight of a glass-like type structure;
- and
- which process comprises the steps of:
- (1)heating a polysaccharide in the presence of water at a temperature ranging from 70 to 97 μC. so as to obtain a warm gelatinized polysaccharide,
- (2)drying the warm gelatinized polysaccharide obtained in step (1) so as to obtain a glass-like polysaccharide;
- and
- (3)grinding the dry glass-like polysaccharide obtained in step (2) to particles and recovering the particles having a size up to 620 μm,
- wherein:
- at least one surfactant is added in step (1);
- the weight % of polysaccharide in water ranges from 3.2 to 50;
- and
- the weight % of surfactant in the polysaccharide ranging from 6 to 10.
Diaper consisting of:
- a first external layer permeable to physiological fluids;
- a central matrix essentially made of an absorbing material;
- and
- a second external layer impermeable to physiological fluids and to aggregates formed by said physiological fluids with the absorbing material present in the central matrix which is entrapped between both external layers,
- characterized in that the absorbing material in the central matrix consists of 2 to 27% (in weight by total weight of the absorbing material present in the matrix) of an absorbent which is selected from the group consisting of
- a) particulate absorbents for the absorption of liquids, comprising particles selected from the group consisting of particles of glass-like polysaccharides and of particles of glass-like polysaccharides occluding, in their internal structure, at least one surfactant, said particles:
- having a size up to 620 μm;
- being at least 70% by weight of a glass-like type structure;
- and
- being for:
- 30 to 45% by weight of a size comprised between 620 and 420 μm;
- 35 to 55% by weight of a size comprised between 420 and 210 μm;
- and
- 5 to25% by weight of a size up to 210 μm;
- b) absorbing compositions comprising:
- 77 to 83% by weight of a particulate absorbent for liquids as defined in the above paragraph a);
- 15 to 17% by weight of an insoluble carboxymethylcellulose;
- and
- 2 to 6% by weight of a high viscosity carboxymethylcellulose;
- c) absorbing compositions comprising:
- 79 to 92% by weight of a particulate absorbent for liquids as defined in the above paragraph a);
- 4 to 10.5% by weight of a xanthane gum;
- and
- 4 to 10.5% by weight of a guar gum;
- and
- d) mixtures of at least one particulate absorbent as defined in paragraph a) with at least one absorbing composition as defined in paragraph b) and/or c),
- the remaining part of the absorbing material in said central matrix being selected from the group consisting of natural fibres, semi-synthetic fibres, synthetic fibres, wood pulp, cellulose fibres, cotton, peat-moss and mixture thereof.
A particulate absorbent, for the absorption of liquids, comprising particles of glass-like polysaccharides occluding, in their internal structure, at least one surfactant wherein said particles have a size of up to 620 μm.
Dependencies are inferred from the claim text.