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US4064041A
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Separating material for thin layer chromatography
Assignee: Merck Patent GmbH
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Filing: 1976-05-27
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Granted: 1977-12-20
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Expires: 1996-05-27
Abstract
Abstract A separating material for thin layer chromatography comprising an inert substrate coated with a sorption agent consisting essentially of silica gel particles about 3 to 8 mu m in diameter in a layer 100-300 mu m thick.
Inventors
- 👤 Herbert Halpaap
- 👤 Walter Reich
- 👤 Johannes Ripphahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:48
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N30/93; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; G01N30/02; G01N30/50; G01N30/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
In a separating material for thin layer chromatography comprising a flat inert substrate having superimposed thereon a 100-300 μm thick layer of a sorption agent, wherein the improvement comprises said sorption agent consisting essentially of silica gel particles of which at least 80% are 3 to 8 μm in diameter, and not more than about 10% of said silica gel being either below 3 μm or about 8 μm, and the weight related specific surface area of said silica gel particles is 0.5-0.7 m 2 /g.
Claim 2
Dependent Claim
86 words
In a separating material for thin layer chromatography comprising a flat inert substrate having superimposed thereon a 100-300 μm thick layer of a sorption agent, wherein the improvement comprises said sorption agent consisting essentially of silica gel particles of which at least 80% are 3 to 8 μm in diameter, and not more than about 10% of said silica gel being either below 3 μm or about 8 μm, and the weight related specific surface area of said silica gel particles is 0.5-0.7 m 2 /g.
Claim 3
Dependent Claim
18 words
A separating material according to claim 1, wherein at least 85% of said particles are of said diameter.
Claim 4
Dependent Claim
18 words
A separating material according to claim 2, wherein at least 90% of said particles are of said diameter.
Claim 5
Dependent Claim
24 words
A separating material according to claim 1, wherein said inert substrate is selected from the group consisting of glass, aluminum foil and polyester films.
Claim 6
Dependent Claim
48 words
In a process for the separation of materials by thin layer chromatography by applying a sample to a separating material coated onto an inert substrate and developing the applied sample with a solvent, the improvement which comprises using as said separating material the separating material of claim 1.
Claim 7
Dependent Claim
48 words
In a process for the separation of materials by thin layer chromatography by applying a sample to a separating material coated onto an inert substrate and developing the applied sample with a solvent, the improvement which comprises using as said separating material the separating material of claim 2.
Claim 8
Dependent Claim
48 words
In a process for the separation of materials by thin layer chromatography by applying a sample to a separating material coated onto an inert substrate and developing the applied sample with a solvent, the improvement which comprises using as said separating material the separating material of claim 3.
Claim 9
Dependent Claim
48 words
In a process for the separation of materials by thin layer chromatography by applying a sample to a separating material coated onto an inert substrate and developing the applied sample with a solvent, the improvement which comprises using as said separating material the separating material of claim 4.
Claim 10
Dependent Claim
41 words
A separating material according to claim 1, wherein the silica gel particles have a specific surface area of 400 - 700 m 2 /g, a pore volume of 0.5 - 0.1 ml/g and a pore diameter of 40 - 100 A.
Claim 11
Dependent Claim
93 words
In a separating material for thin layer chromatography comprising a flat inert substrate having superimposed thereon a 100-300 μm thick layer of a sorption agent, wherein the improvement comprises said sorption agent being a silica gel composition consisting essentially of 85 to 99% of a silica gel of which at least 80% are 3 to 8 μm in diameter with a weight related specific surface area of between 0.5 to 0.7 m 2 /g., 0.1 to about 10 weight % of a binding agent and 0.5 to 5 weight % of an indicator.
Claim 12
Dependent Claim
93 words
In a separating material for thin layer chromatography comprising a flat inert substrate having superimposed thereon a 100-300 μm thick layer of a sorption agent, wherein the improvement comprises said sorption agent being a silica gel composition consisting essentially of 85 to 99% of a silica gel of which at least 80% are 3 to 8 μm in diameter with a weight related specific surface area of between 0.5 to 0.7 m 2 /g., 0.1 to about 10 weight % of a binding agent and 0.5 to 5 weight % of an indicator.
Claim 13
Dependent Claim
36 words
A separating material for thin layer chromatography according to claim 10, wherein the amount of silica gel is about 96.5%, the amount of binding agent is about 2% and the amount of indicator is about 1.5%.
Claim 14
Dependent Claim
33 words
A separating material for thin layer chromatography according to claim 11, wherein the binding agent is sodium acrylate or sodium methacrylate or a mixture thereof and the indicator is manganese activated zinc silicate.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |