Patent US4536566A successfully refreshed from Google Patents.
US4536566A
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Process for preparing substantially linear polyamides from acrylamide and aqueous ammonia
Assignee: Standard Oil Co
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Filing: 1981-05-04
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Granted: 1985-08-20
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Expires: 2001-05-04
Abstract
Abstract Acrylamide and methacrylamide are either self-polymerized or copolymerized with other monomers, such as amino acids, in the presence of a stoichiometric amount of aqueous ammonia and at a temperature of at least 200° C. under autogenous pressure to form substantially linear polyamides, such as poly-β-alanine and nylon-3/6.
Inventors
- 👤 Gerald P. Coffey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:34
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A process for preparing a substantially linear polyamide, the process comprising contacting a first monomer of the formula ##STR3## with a second monomer selected from the group consisting of: ##STR4## where R is a hydrogen or methyl radical, and R' is a C 1 -C 12 alkyl radical, in a molar ratio of about 1:1 to about 9:1 in the presence of at least a stoichiometric amount, based on the combined moles of the monomers, of aqueous ammonia at a temperature of at least about 190° C. and autogenous pressure.
Claim 2
Dependent Claim
90 words
A process for preparing a substantially linear polyamide, the process comprising contacting a first monomer of the formula ##STR3## with a second monomer selected from the group consisting of: ##STR4## where R is a hydrogen or methyl radical, and R' is a C 1 -C 12 alkyl radical, in a molar ratio of about 1:1 to about 9:1 in the presence of at least a stoichiometric amount, based on the combined moles of the monomers, of aqueous ammonia at a temperature of at least about 190° C. and autogenous pressure.
Claim 3
Dependent Claim
16 words
The process of claim 1 where both the first and second monomer are of formula I.
Claim 4
Dependent Claim
10 words
The process of claim 2 where R is hydrogen radical.
Claim 5
Dependent Claim
10 words
The process of claim 2 where R is methyl radical.
Claim 6
Dependent Claim
13 words
The process of claim 1 where the second monomer is of formula II.
Claim 7
Dependent Claim
15 words
The process of claim 5 where R' is a C 1 -C 8 alkyl radical.
Claim 8
Dependent Claim
19 words
The process of claim 6 where the second monomer is selected from the group consisting of N-t-butylacrylamide and N-t-octylacrylamide.
Claim 9
Dependent Claim
31 words
The process of claim 3, 4, 5, 6 or 7 where the aqueous ammonia is present in a molar excess based on the total moles of the first and second monomers.
Claim 10
Dependent Claim
39 words
The process of claim 8 where the aqueous ammonia and first and second monomers are contacted first at a temperature below 190° C. and subsequently at a temperature between about 200° C. and about 230° C. and autogenous pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |