EP0272074A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Water-absorbent polymer composition, method of forming it and article containing it
Assignee: Camelot Superabsorbents Ltd
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Filing: 1987-12-15
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Granted: —
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Expires: 2007-12-15
Abstract
Abstract A copolymer of recurring units of at least one alpha , beta -unsaturated monomer and recurring units of at least one copolymerizable comonomer comprising, in its preferred embodiment from about 20 to about 80 percent pendant carboxylic acid units and from about 80 to about 20 percent pendant carboxylate salt units, is blended with at least one disaccharide or oligosaccharide to produce a water-absorbing composition upon curing. The composition is particularly suitable for fiber formation.
Inventors
- 👤 Bi Le-Khac
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 12:12
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L15/22; A61L15/24; C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1545; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
152 words
A composition which is water-absorbent upon curing comprising: (a) a copolymer containing from about 25 to about 75 mole percent recurring units of at least one α , β -unsaturated monomer bearing at least one pendant unit selected from the group consisting of carboxylic acid units and derivatives of carboxylic acid units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer, wherein from about 20 to about 80 percent of the total pendant units introduced through the recurring units of the α , β -unsaturated monomer must either be carboxylic acid units or must be converted into carboxylic acid units, and wherein from about 80 to about 20 percent of the total pendant units must either be carboxylate salt units or must be converted into carboxylate salt units; and (b) at least one carbohydrate compound selected from the group consisting of disaccharides and oligosaccharides.
Claim 2
Dependent Claim
152 words
A composition which is water-absorbent upon curing comprising: (a) a copolymer containing from about 25 to about 75 mole percent recurring units of at least one α , β -unsaturated monomer bearing at least one pendant unit selected from the group consisting of carboxylic acid units and derivatives of carboxylic acid units and from about 75 to about 25 mole percent recurring units of at least one copolymerizable comonomer, wherein from about 20 to about 80 percent of the total pendant units introduced through the recurring units of the α , β -unsaturated monomer must either be carboxylic acid units or must be converted into carboxylic acid units, and wherein from about 80 to about 20 percent of the total pendant units must either be carboxylate salt units or must be converted into carboxylate salt units; and (b) at least one carbohydrate compound selected from the group consisting of disaccharides and oligosaccharides.
Claim 3
Dependent Claim
52 words
The composition of claim 1 in which said copolymer contains from about 35 to about 65 mole percent recurring units of said at least one α , β -unsaturated monomer and from about 65 to about 35 mole percent of said at least one copolymerizable comonomer, and is preferably an equimolar copolymer.
Claim 4
Dependent Claim
54 words
The composition of claim 1 or claim 2 comprising in weight percent from about 80 to about 99 of said copolymer and from about 1 to about 20 of said carbohydrate compound, and preferably from about 85 to about 95 of said copolymer and from about 5 to about 15 of said carbohydrate compound.
Claim 5
Dependent Claim
36 words
The composition of any one of claims 1 to 3 in which said copolymer is selected from copolymers of styrene and maleic anhydride, copolymers of ethylene and maleic anhydride and copolymers of isobutylene and maleic anhydride.
Claim 6
Dependent Claim
29 words
The composition of any one of claims 1 to 4 in which said compound (b) is selected from sucrose, lactose, maltose, cellobiose and oligosaccharides consisting of 2-10 monosaccharide units.
Claim 7
Independent Claim
34 words
A method of producing a water-absorbing composition comprising the steps of: (a) preparing a blend comprising a composition as claimed in any one of claims 1 to 5, and (b) curing the resulting blend.
Claim 8
Dependent Claim
27 words
The method of claim 6 comprising the step of forming the blend into a shaped article after the blend is prepared but before it is fully cured.
Claim 9
Dependent Claim
18 words
The method of claim 7 in which the blend is formed into fibers, a powder or a film.
Claim 10
Dependent Claim
20 words
The method of claim 6, claim 7 or claim 8 in which said curing is induced by heating the blend.
Claim 11
Dependent Claim
34 words
An article of manufacture comprising a cured water-absorbing composition and a means for supporting said composition for absorption usage, wherein said water-absorbing composition is as claimed in any one of claims 1 to 5.
Claim 12
Dependent Claim
28 words
The article of manufacture of claim 10 in which said means for supporting said composition is selected disposable diapers, tampons, sanitary napkins, surgical or dental sponges and bandages.
Claim 13
Dependent Claim
32 words
The article of claim 10 or claim 11 in which said composition is incorporated into said means for supporting in a fibrous form, the form of powder and/or the form of film.
Claim 14
Independent Claim
77 words
A method of enhancing the water absorption characteristics of an article of manufacture which comprises the step of incorporation into said article a cured water absorbing composition wherein said composition is as claimed in any one of claims 1 to 5, said composition being incorporated into said article in an effective amount to enhance at least one water-absorbing characteristic of said article as compared to the water-absorbing characteristics of the article in the absence of the composition.
Claim 15
Dependent Claim
22 words
The method of claim 13 in which said article of manufacture is selected from disposable diapers, tampons, sanitary napkins, and disposable bandages.
Claim 16
Dependent Claim
34 words
The method of claim 14 or claim 15 in which said composition is incorporated into said means for supporting in a fibrous form, in the form of powder, and/or in the form of film.
Claim 17
Independent Claim
36 words
A method of absorbing water and electrolyte solutions comprising the step of contacting the water or electrolyte solution to be absorbed with a cured water-absorbing composition as claimed in any one of claims 1 to 5.
References Cited (Backward Citations)
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