US3692750A
Expired / Lapsed
US
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Process for preparing polyamides
Assignee: Sunoco Inc
•
Filing: 1970-09-25
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Granted: 1972-09-19
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Expires: 1990-09-25
Abstract
Abstract Polyamides are produced by reacting an organic dinitrile with adamantane and alkyl-adamantane compounds having two substituents selected from the group consisting of chlorine, bromine and hydroxy in the presence of a strong sulfuric acid corresponding to 99.5-118% H2SO4 equivalent or polyphosphoric acid.
Inventors
- 👤 Irl N Duling
- 👤 Gary L Driscoll
- 👤 Robert E Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:41
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
A process according to claim 1 wherein the sulfuric concentration is in the range of 100.1 to 111% H2SO4 equivalents acid and the temperature is in the range of -30* to 50* C.
Claim 2
Dependent Claim
20 words
The process according to claim 2 wherein the alkyl radicals of R and R'' have one to 10 carbon atoms.
Claim 3
Dependent Claim
16 words
The process according to claim 3 wherein at least one of R and R'' is alkyl.
Claim 4
Dependent Claim
12 words
The process according to claim 4 wherein R and R'' are alkyl.
Claim 5
Dependent Claim
18 words
A process according to claim 2 wherein the temperature is in the range of -10* to 20* C.
Claim 6
Dependent Claim
13 words
A process according to claim 5 wherein said dialkyladamantane compound is 1,3-dihydroxy-5, 7-dimethyl-adamantane.
Claim 7
Dependent Claim
61 words
A process for producing polyamides which comprises reacting an organic dinitrile with 1,3-dibromo-5,7-dimethyl adamantane at a temperature below the decomposition temperature of the reactants, in the presence of a strong acid selected from the group consisting of sulfuric acid having a concentration of 99.5 to 118% H2SO4 equivalent and polyphosphoric acid, mixing the reaction mixture with water and separating the polyamide.
Claim 8
Dependent Claim
61 words
A process for producing polyamides which comprises reacting an organic dinitrile with 1,3-dichloro-5,7-dimethyl adamantane at a temperature below the decomposition temperature of the reactants, in the presence of a strong acid selected from the group consisting of sulfuric acid having a concentration of 99.5 to 118% H2SO4 equivalent and polyphosphoric acid, mixing the reaction mixture with water and separating the polyamide.
References Cited (Backward Citations)
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US3053907A
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US3329653A
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US3296201A
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US3301827A
Cited
US3296218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |