EP0264208A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Extended shelf life water-absorbing composition which facilitates fiber formation
Assignee: Camelot Superabsorbents Ltd
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Filing: 1987-10-01
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Granted: —
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Expires: 2007-10-01
Abstract
Abstract A copolymer of recurring units of at least one α,β -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 monomer containing at least two hydroxyl groups 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
2026-11-04 07:52
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
182 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 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 monomer containing at least two hydroxyl groups selected from the group consisting of: alkylene glycols containing 2-10 carbon atoms and their ethers; cycloalkylene glycols; Bisphenol A, hydroxy alkylene derivatives of Bisphenol A, hydroquinone; phloroglucinol; hydroxy alkylene derivatives of diphenols; glycerol, erythritol, pentaerythritol, and all natural monosaccharides.
Claim 2
Dependent Claim
182 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 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 monomer containing at least two hydroxyl groups selected from the group consisting of: alkylene glycols containing 2-10 carbon atoms and their ethers; cycloalkylene glycols; Bisphenol A, hydroxy alkylene derivatives of Bisphenol A, hydroquinone; phloroglucinol; hydroxy alkylene derivatives of diphenols; glycerol, erythritol, pentaerythritol, and all natural monosaccharides.
Claim 3
Dependent Claim
51 words
A composition as claimed in claim 1 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 preferably is an equimolar copolymer.
Claim 4
Dependent Claim
64 words
A composition as claimed in claim 1 or 2 comprising in weight percent from about 80 to about 99.5 of said copolymer and from about 0.5 to about 20 of said monomer bearing at least two hydroxyl groups, and preferably from about 90 to 99 of said copolymer and from about 1 to about 10 of said monomer bearing at least two hydroxyl groups.
Claim 5
Dependent Claim
38 words
A composition as claimed in 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
41 words
A composition as claimed in any one claims 1 to 4 in which said monomer is selected from ethylene glycol, propylene glycol, 1,4-butane diol, diethylene glycol, glycerol, and pentaerythritol and mixtures of two or more thereof, preferably 1,4-butane diol and pentaerythritol.
Claim 7
Independent Claim
30 words
A method of producing a water-absorbing composition comprising the steps of: a) forming a composition as claimed in any one of claims 1 to 5, and b) curing said composition.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 6 comprising the step of forming the composition into a shaped article after the composition is prepared but before it is fully cured.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 7 in which the shaped article is selected from fibers, powder and film.
Claim 10
Independent Claim
22 words
A method as claimed in any one of claims 6 to 8 in which said curing is induced by heating the composition.
Claim 11
Dependent Claim
42 words
An article of manufacture comprising a cured water-absorbing composition as claimed in any one claims 1 to 5, or formed by the method claimed in any one of claims 6 to 9, and a means for supporting said composition for absorption usage.
Claim 12
Dependent Claim
29 words
An article as claimed in claim 10 in which said means for supporting said composition is selected from disposable diapers, tampons, sanitary napkins, surgical and dental sponges and bandages.
Claim 13
Dependent Claim
36 words
An article as claimed in claim 10 or claim 11 in which said composition is incorporated into said means for supporting in a fibrous form, in the form of powder, or in the form of film.
Claim 14
Independent Claim
98 words
A method of enhancing the water absorption characteristics of an article of manufacture which comprises the step of incorporating into said article a cured water absorbing composition when said composition is a composition as claimed in any one of claims 1 to 5 or said cured composition has been obtained by the method claimed in any one of claims 6 to 9 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
24 words
A method as claimed in claim 13 in which said article of manufacture is selected from disposable diapers, tampons, sanitary napkins and disposable bandages.
Claim 16
Dependent Claim
36 words
A method as claimed in claim 13 or claim 14 in which said composition is incorporated into said means for supporting in a fibrous form, in the form of powder, or in the form of film.
Claim 17
Independent Claim
59 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 wherein said composition is a composition as claimed in any one of claims 1 to 5 or said cured composition is obtained by the method of any one of claims 6 to 9.
References Cited (Backward Citations)
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