EP0213799A1
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Absorbent polymers, their manufacture and uses
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1986-08-06
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Granted: —
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Expires: 2006-08-06
Abstract
Abstract The properties of absorptive synthetic polymer particles formed by polymerisation of water soluble monomers such as sodium acrylate or acrylamide with a cross linking agent are improved, especially as regards absorptive capacity for aqueous electrolytes, by copolymerising the monomers with an ethylenically unsaturated monomer that includes a pendant group -A m B n A p R where B is ethyleneoxy, n is at least 2, A is propyleneoxy or butyleneoxy, m and p are each less than n and are preferably zero, and R is a hydrophobic group.
Inventors
- 👤 David Farrar
- 👤 Peter Flesher
- 👤 Malcolm Hawe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 15:08
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08F; C08F2/00; C08F2/32; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F246/00; C08J3/09; C08J2300/00; C08J2300/10; C08J2300/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
An absorbent polymer comprising water insoluble, water-swellable particles having a dry size of at least 20 µm and formed from monomers comprising (a) 30 to 99% by weight water soluble ethylenically unsaturated monomer, (b) 0 to 40% water insoluble ethylenically unsaturated monomer, and (c) 0.0001 to 1% by weight cross linking agent, and characterised in that the monomers include 1 to 70% by weight ethylenically unsaturated monomer that carries a pendant group -A m B n A p R wherein B is ethyleneoxy, n is at least 2, A is propyleneoxy or butyleneoxy, m and p are each an integer less than n and R is a hydrophobic group containing at least 8 carbon atoms.
Claim 2
Dependent Claim
115 words
An absorbent polymer comprising water insoluble, water-swellable particles having a dry size of at least 20 µm and formed from monomers comprising (a) 30 to 99% by weight water soluble ethylenically unsaturated monomer, (b) 0 to 40% water insoluble ethylenically unsaturated monomer, and (c) 0.0001 to 1% by weight cross linking agent, and characterised in that the monomers include 1 to 70% by weight ethylenically unsaturated monomer that carries a pendant group -A m B n A p R wherein B is ethyleneoxy, n is at least 2, A is propyleneoxy or butyleneoxy, m and p are each an integer less than n and R is a hydrophobic group containing at least 8 carbon atoms.
Claim 3
Dependent Claim
24 words
A polymer according to claim 1 in which n is at least 5 preferably 10 to 100 and m and p are each zero.
Claim 4
Dependent Claim
34 words
A polymer according to claim 1 or claim 2 in which R is a polyoxypropylene, polyoxybutylene or a hydrocarbyl group of 8 to 30 carbon atoms selected from alkyl, aralkyl, aryl, alkaryl and cycloalkyl.
Claim 5
Dependent Claim
25 words
A polymer according to claim 3 in which R is a hydrocarbyl group containing 10 to 24 carbon atoms and selected from alkyl and alkaryl.
Claim 6
Dependent Claim
26 words
A polymer according to claim 1 in which the monomer has the formula CH₂=CR'CH₂OA m B n A p R where R' is hydrogen or methyl.
Claim 7
Dependent Claim
31 words
A polymer according to any preceding claim in which monomer (a) comprises 20 to 100% ionic monomer with 0 to 80% non-ionic monomer, the amounts being by weight of monomer (a).
Claim 8
Dependent Claim
49 words
A polymer according to any preceding claim in which monomer (a) comprises 20 to 100% a monomer selected from dialkylaminoalkyl (meth) -acrylates and -acrylamides and their acid salt and quaternised derivatives, where the alkyl groups contain up to 4 carbon atoms, and sodium acrylate with 0 to 80% acrylamide.
Claim 9
Dependent Claim
64 words
A polymer according to any preceding claim comprising 3 to 30% by weight of monomer (d), 20 to 60% by weight a monomer selected from dialkylaminoalkyl (meth) -acrylates and -acrylamides and their acid salt and quaternised derivatives, where the alkyl groups contain up to 4 carbon atoms, and sodium acrylate and 30 to 70% by weight acrylamide and 0.0005 to 0.1% cross linking agent.
Claim 10
Dependent Claim
68 words
A polymer according to any of claims 1 to 6 formed from 3 to 30% by weight of monomer (d) 97 to 70% by weight a monomer selected from dialkylaminoalkyl (meth) -acrylates and -acrylamides and their acid salt and quaternised derivatives, where the alkyl groups contain up to 4 carbon atoms, and sodium acrylate and 0 to 20% by weight acrylamide and 0.0005 to 0.1% cross linking agent.
Claim 11
Dependent Claim
9 words
A diaper containing absorbent polymer according to claim 1.
References Cited (Backward Citations)
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