US4095991A
Expired / Lapsed
US
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Enhancement of heteropolysaccharide solubility
Assignee: Rhone Poulenc Industries SA
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Filing: 1976-01-26
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Granted: 1978-06-20
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Expires: 1996-01-26
Abstract
Abstract The water solubility of certain heteropolysaccharide salts of calcium is enhanced by effecting the dissolution thereof conjointly with an organic acid or anhydride thereof having at least one pK value between 5 and 7, the calcium salt or salts of such organic acid or anhydride itself or themselves being soluble in water.
Inventors
- 👤 Pierre Falcoz
- 👤 Pierre Celle
- 👤 Jean-Claude Campagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
The method of enhancing the solubility in water of a calcium salt of a heteropolysaccharide obtained through fermentation of carbohydrates by means of bacteria of the genus Xanthomonas, which method comprises effecting the dissolution of such calcium salt, in an aqueous medium, conjointly with at least one member selected from the group consisting of an organic acid and an anhydride of such organic acid, said at least one member having at least one pK value between 5 and 7, and the calcium salt or salts of said at least one member being soluble in water.
Claim 2
Independent Claim
95 words
The method of enhancing the solubility in water of a calcium salt of a heteropolysaccharide obtained through fermentation of carbohydrates by means of bacteria of the genus Xanthomonas, which method comprises effecting the dissolution of such calcium salt, in an aqueous medium, conjointly with at least one member selected from the group consisting of an organic acid and an anhydride of such organic acid, said at least one member having at least one pK value between 5 and 7, and the calcium salt or salts of said at least one member being soluble in water.
Claim 3
Dependent Claim
37 words
The method as defined by claim 1, wherein the dissolution is effected with an organic acid, said organic acid being selected from the group consisting of maleic acid, citric acid, itaconic acid, citraconic acid and gluconic acid.
Claim 4
Dependent Claim
35 words
The method as defined by claim 1, wherein the dissolution is effected with an organic acid anhydride, said organic acid anhydride being selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
Claim 5
Dependent Claim
34 words
The method as defined by claim 1, wherein the organic acid or anhydride thereof is present in an amount of from between 5 and 25% by weight, based upon the weight of the heteropolysaccharide.
Claim 6
Dependent Claim
15 words
The method as defined by claim 1, wherein the heteropolysaccharide is dissolved in powder form.
Claim 7
Dependent Claim
89 words
A composition of matter adapted as a viscosity increasing additive for aqueous media, said composition comprising [1] a calcium salt of a heteropolysaccharide obtained through fermentation of carbohydrates by means of bacteria of the genus Xanthomonas, and [2] at least one member selected from the group consisting of an organic acid and an anhydride of such organic acid, said at least one member having at least one pK value between 5 and 7, and the calcium salt or salts of said at least one member being soluble in water.
Claim 8
Dependent Claim
89 words
A composition of matter adapted as a viscosity increasing additive for aqueous media, said composition comprising [1] a calcium salt of a heteropolysaccharide obtained through fermentation of carbohydrates by means of bacteria of the genus Xanthomonas, and [2] at least one member selected from the group consisting of an organic acid and an anhydride of such organic acid, said at least one member having at least one pK value between 5 and 7, and the calcium salt or salts of said at least one member being soluble in water.
Claim 9
Dependent Claim
34 words
The composition of matter as defined by claim 6, wherein the component [2] is an organic acid selected from the group consisting of maleic acid, citric acid, itaconic acid, citraconic acid and gluconic acid.
Claim 10
Dependent Claim
31 words
The composition of matter as defined by claim 6, wherein the component [2] is an organic acid anhydride selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
Claim 11
Dependent Claim
34 words
The composition of matter as defined by claim 6, wherein the component [2] is present in an amount of from between 5 and 25% by weight, based upon the weight of the component [1].
Claim 12
Dependent Claim
17 words
The composition of matter as defined by claim 6, wherein the component [1] is in powder form.
Claim 13
Dependent Claim
16 words
A solution, in an aqueous medium, of the composition of matter as defined by claim 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |