EP0268498A2
Expired / Lapsed
EP
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Absorbent products and their manufacture
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1987-11-20
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Granted: —
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Expires: 2007-11-20
Abstract
Abstract A water absorbent water insoluble polymeric element, such as a fibre, film, coating, bonding layer or foam, is made by forming a substantially linear polymer by polymerisation of water soluble ethylenically unsaturated monomer blends comprising carboxylic and hydroxylic monomers and then reacting the carboxylic and hydroxylic monomers in the linear polymer to form internal cross links within the polymer.
Inventors
- 👤 Adrian Allen
- 👤 David Farrar
- 👤 Peter Flesher
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:56
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
79 words
A water absorbent, water insoluble, polymeric element that has been made by forming a substantially linear polymer by polymerisation of a water soluble ethylenically unsaturated monomer blend comprising monomer that provides carboxylic acid monomer groups and monomer that provides hydroxyl groups that can react with the carboxylic acid groups to form ester cross linkages that contain only carbon and oxygen atoms in the linkages, and then reacting the said carboxylic and hydroxylic groups to form the said cross linkages.
Claim 2
Dependent Claim
79 words
A water absorbent, water insoluble, polymeric element that has been made by forming a substantially linear polymer by polymerisation of a water soluble ethylenically unsaturated monomer blend comprising monomer that provides carboxylic acid monomer groups and monomer that provides hydroxyl groups that can react with the carboxylic acid groups to form ester cross linkages that contain only carbon and oxygen atoms in the linkages, and then reacting the said carboxylic and hydroxylic groups to form the said cross linkages.
Claim 3
Dependent Claim
26 words
An element according to claim 1 in which the monomer that provides the carboxylic acid groups is selected from acrylic acid and water soluble salts thereof.
Claim 4
Dependent Claim
34 words
An element according to claim 1 in which the monomer that provides the hydroxylic groups is selected from vinyl alcohol, allyl alcohol, epoxide substituted vinyl monomers and hydroxy alkyl esters of vinyl carboxylic monomers.
Claim 5
Dependent Claim
25 words
An element according to claim 1 in which the monomer that provides the hydroxylic groups is selected from hydroxy alkyl esters of (meth) acrylic acid.
Claim 6
Dependent Claim
27 words
An element according to claim 1 in which the amount of monomer that provides the hydroxyl groups is from 0.1 to 15% by weight of total monomers.
Claim 7
Dependent Claim
46 words
An element according to claim 1 in which the carboxylic acid monomer is present as a mixture of free carboxylic acid and alkali metal salt groups in the ratio 1:1 to 1:10 and the total amount thereof is at least 40% by weight of the monomers.
Claim 8
Dependent Claim
19 words
An element according to claim 1 in which the monomer blend includes 2 to 50% by weight plasticising monomer.
Claim 9
Dependent Claim
25 words
An element according to claim 7 in which the plasticising monomer is selected from styrenes, vinyl esters, acrylonitrile and alkyl esters of ethylenically unsaturated acids.
Claim 10
Dependent Claim
31 words
An element according to claim 7 in which the plasticising monomer is selected from C1-24 alkyl (meth) acrylates in an amount of from 10 to 45% by weight of the monomers.
Claim 11
Dependent Claim
23 words
An element according to claim 1 in which the said esterification reaction is effected by heating the substantially linear polymer at above 150°C.
Claim 12
Dependent Claim
17 words
An element according to claim 1 in which the linear polymer is made by aqueous solution polymerisation.
Claim 13
Dependent Claim
36 words
An element according to claim 1 in which the linear polymer is made by solution polymerisation and the resultant solution is shaped into the desired shape of the element before the formation of the cross links.
Claim 14
Dependent Claim
35 words
An element according to claim 12 in which the shaping is by extrusion of the solution of the substantially linear polymer and the shaped element has one dimension at least five times a second dimension.
Claim 15
Dependent Claim
15 words
An element according to claim 13 in which the element is a fibre or film.
Claim 16
Dependent Claim
45 words
An element according to claim 12 in which the shaping is by impregnating or coating the solution of the substantially linear polymer on to a film or fibrous core to form a polymer product comprising the film or fibrous core coated with the absorbent polymer.
Claim 17
Dependent Claim
57 words
An element according to claim 12 in which the shaping is by applying the solution of the substantially linear polymer to a first substrate and laminating a second substrate to the first substrate while the polymer is in solution, and the shaped element comprises a laminate of the first and second substrates bonded by the absorbent polymer.
Claim 18
Dependent Claim
43 words
An element according to claim 12 in which the shaping is by incorporating the solution of the substantially linear polymer into a foamable composition and foaming the composition and the shaped element is a foam comprising the swellable polymer substantially uniformly distributed throughout.
References Cited (Backward Citations)
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