CA1152483A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Absorbent materials
Assignee: Unilever PLC
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Filing: 1980-04-22
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Granted: 1983-08-23
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Expires: 2000-04-22
Abstract
Abstract J.720 ABSTRACT An absorbent material useful for immobilising blood consists of a blood-swellable, substantially water-insoluble, covalently cross-linked anionic polyelectrolyte having at least some of its anions associated with transition metal counterions which are capable of coagulating blood, the polyelectrolyte having the property that when the polyelectrolyte is contacted with blood transition metal counterions dissociate from the polyelectrolyte, diffuse into the blood and cause coagulation thereof.
Inventors
- 👤 John H.C. Windust
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-23 16:29
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
An absorbent material suitable for immobilising blood consisting of a blood-swellable, substantially water-insoluble, covalently cross-linked anionic polyelectrolyte having at least some of its anions associated with transition metal counterions which are capable of coagulating blood, the polyelectrolyte being characterised by the property that when the polyelectrolyte is contacted with blood transition metal counterions dissociate from the polyelectrolyte, diffuse into the blood and cause coagulation thereof.
Claim 2
Dependent Claim
65 words
An absorbent material suitable for immobilising blood consisting of a blood-swellable, substantially water-insoluble, covalently cross-linked anionic polyelectrolyte having at least some of its anions associated with transition metal counterions which are capable of coagulating blood, the polyelectrolyte being characterised by the property that when the polyelectrolyte is contacted with blood transition metal counterions dissociate from the polyelectrolyte, diffuse into the blood and cause coagulation thereof.
Claim 3
Dependent Claim
17 words
An absorbent material as claimed in Claim 1, characterised in that the polyelectrolyte is an anionic polysaccharide.
Claim 4
Dependent Claim
20 words
An absorbent material as claimed in Claim 1 or Claim 2, characterised in that the anionic groups are carboxyalkyl groups.
Claim 5
Dependent Claim
22 words
An absorbent material as claimed in any of Claims 1 to 3, characterised in that the transition metal is zinc or copper
Claim 6
Dependent Claim
72 words
Process for making an absorbent material as claimed in Claim 1, characterised in that a water-swellable, at least partially water-insoluble, covalently cross-linked anionic polyelectrolyte is treated in a swollen state with a compound of a transition metal whose ions are capable of coagulating blood so that at least some of the anions of the polyelectrolye become associated with transition metal counterions, and the treated polyelectrolyte is then dried. - 22 - J.720
Claim 7
Dependent Claim
66 words
A process as claimed in Claim 5, characterised in that the water-swellable, covalently cross-linked,at least partially water-insoluble, anionic polyelectrolyte in its acid form is contacted in a water-swollen state with a compound of said transition metal reactive with the acidic groups of said polyelectrolyte to form metal salt groups; any non-volatile anions of the metal compound are removed by washing, and the water-swollen absorbent then dried.
Claim 8
Dependent Claim
21 words
A process as claimed in Claim 6, characterised in that the transition metal compound is a basic zinc or copper compound.
Claim 9
Dependent Claim
22 words
A process as claimed in Claim 7, characterised in that the transition metal compound is zinc or copper carbonate, oxide or hydroxide.
Claim 10
Dependent Claim
84 words
A process as claimed in Claim 5, characterised in that the water-swellable, covalently cross-linked,at least partially water-insoluble, anionic polyelectrolyte in the form of its alkali metal, alkaline- earth metal, ammonium or substituted ammonium salt is contacted with a medium in which the polyelectrolyte is swellable and in which a soluble salt of said transition metal is dissolved whereby ion-exchange occurs and ions of said transition metal are introduced into the swollen polyelectrolyte, whereafter the polyelectrolyte is separated from said medium, washed and then dried.
Claim 11
Dependent Claim
18 words
A process as claimed in Claim 9, characterised in that the swelling medium for the polyelectrolyte is water.
Claim 12
Dependent Claim
24 words
A process as claimed in Claim 9 or 10,characterised in that the transition metal salt is zinc or copper chloride, nitrate, sulphate or acetate.
References Cited (Backward Citations)
No citation records indexed.
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