EP0380254A2
Expired / Lapsed
EP
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Form-in-place polysaccharide gels
Assignee: 3M Co
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Filing: 1990-01-19
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Granted: —
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Expires: 2010-01-19
Abstract
Abstract A method and article useful for preparing stable polysaccharide gels from aqueous solutions of water-soluble polysaccharides bearing pendant carboxylate groups. The gels produced may be of the foamed or nonfoamed variety.
Inventors
- 👤 James E. C/O Minnesota Mining And Garbe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 02:35
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; A; A61; A61L; A61L26/00; A61L26/0009; A61L26/0023; A61L26/0061; A61L26/008; C08J3/24; C08J3/241; C08L; C08L5/00; C08L5/04; C08J2305/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A method of making a polysaccharide gel from water-soluble polysaccharides bearing pendant carboxylate groups comprising mixing together a first liquid component comprising an aqueous solution of one of said water-soluble polysaccharides having suspended therein particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharides to form a water-insoluble polysaccharide gel; and a second liquid component comprising an aqueous solution of a water-soluble acid.
Claim 2
Independent Claim
95 words
A method of making a polysaccharide gel from water-soluble polysaccharides bearing pendant carboxylate groups comprising mixing together a first liquid component comprising an aqueous solution of one of said water-soluble polysaccharides having suspended therein particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharides to form a water-insoluble polysaccharide gel; and a second liquid component comprising an aqueous solution of a water-soluble acid.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said water-soluble polysaccharide is selected from the group consisting of the ammonium, magnesium, potassium, sodium, lithium, rubidium, and cesium salts of alginic acid.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said water-insoluble di- or trivalent metal salt is selected from the group consisting of calcium carbonate, calcium phosphate dibasic, barium carbonate and zinc carbonate.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said water-soluble acid is selected from the group consisting of acetic, adipic, fumaric and lactic acids.
Claim 6
Independent Claim
22 words
The method of claims 2, 3 or 4 wherein said second component further comprises water-soluble polysaccharide bearing pendant carboxylate groups dissolved therein.
Claim 7
Independent Claim
46 words
A method of making an alginate gel from water-soluble alginates comprising mixing together a first liquid component comprising a suspension of calcium carbonate particles in an aqueous solution of sodium alginate, and a second liquid component comprising an aqueous solution of sodium alginate and acetic acid.
Claim 8
Independent Claim
46 words
A method of making an alginate gel from water-soluble alginates comprising mixing together a first liquid component comprising a suspension of calcium carbonate particles in an aqueous solution of sodium alginate, and a second liquid component comprising an aqueous solution of sodium alginate and acetic acid.
Claim 9
Independent Claim
109 words
A method of making a foamed polysaccharide gel from water-soluble polysaccharides bearing pendant carboxylate groups comprising mixing together a first liquid component comprising (a) an aqueous solution of one of said water-soluble polysaccharides, (b) particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharides to form a water-insoluble polysaccharide gel, suspended therein, and (c) an effervescent compound that effervesces upon reaction with an acid; and a second liquid component comprising an aqueous solution of a water-soluble acid.
Claim 10
Independent Claim
109 words
A method of making a foamed polysaccharide gel from water-soluble polysaccharides bearing pendant carboxylate groups comprising mixing together a first liquid component comprising (a) an aqueous solution of one of said water-soluble polysaccharides, (b) particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharides to form a water-insoluble polysaccharide gel, suspended therein, and (c) an effervescent compound that effervesces upon reaction with an acid; and a second liquid component comprising an aqueous solution of a water-soluble acid.
Claim 11
Dependent Claim
51 words
The method of claim 7 wherein said water-soluble acid is selected from the group consisting of acetic, adipic, fumaric and lactic acids, wherein said second component further comprises water-soluble polysaccharide bearing pendant carboxylate groups dissolved therein, and said effervescent compound is selected from the group consisting of the alkali metal carbonates.
Claim 12
Dependent Claim
123 words
A self-contained gel-forming article comprising: (1) a first chamber containing a first component comprising an aqueous solution of a water-soluble polysaccharide bearing pendant carboxylate groups having suspended therein particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharide to form a water-insoluble polysaccharide gel; (2) a second chamber containing a second component comprising an aqueous solution of a water-soluble acid; and (3) a means connected to said first and second chambers for intermixing said first and second components without exposing said components to the atmosphere or to any external mixing devices.
Claim 13
Dependent Claim
123 words
A self-contained gel-forming article comprising: (1) a first chamber containing a first component comprising an aqueous solution of a water-soluble polysaccharide bearing pendant carboxylate groups having suspended therein particles of a water-insoluble di- or trivalent metal salt that will react with an acid to form a water-soluble metal salt, and that has a di- or trivalent metal ion capable of complexing with the pendant carboxylate groups of said water-soluble polysaccharide to form a water-insoluble polysaccharide gel; (2) a second chamber containing a second component comprising an aqueous solution of a water-soluble acid; and (3) a means connected to said first and second chambers for intermixing said first and second components without exposing said components to the atmosphere or to any external mixing devices.
Claim 14
Dependent Claim
36 words
A self-contained gel-forming article as recited in claim 9 wherein said first and second chambers are permanently separated and each of said first and second chambers have a discharge opening leading to a common mixing chamber.
References Cited (Backward Citations)
No citation records indexed.
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