US4393174A
Expired / Lapsed
US
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Base hydrolysis of pendant amide polymers
Assignee: Dynapol Shareholders Liquidating Trust
•
Filing: 1981-11-09
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Granted: 1983-07-12
•
Expires: 2001-11-09
Abstract
Abstract Pendant amide polymers, especially polymers containing N-vinylacetamide, N-alkyl-N-vinylacetamide, or N-vinyl-formamide units, are hydrolyzed to pendant amine polymers, especially vinylamine polymers by contact with strong aqueous base at elevated temperature.
Inventors
- 👤 Daniel J. Dawson
- 👤 Phillip J. Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:10
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
The process of treating a polymer having recurring pendant amide units having a structure selected from among ##STR5## wherein R is a lower alkyl to form pendant amine units which comprises contacting said polymer in liquid phase with aqueous strong base at elevated temperature for a time effective to hydrolyze said amide units to amine units.
Claim 2
Dependent Claim
56 words
The process of treating a polymer having recurring pendant amide units having a structure selected from among ##STR5## wherein R is a lower alkyl to form pendant amine units which comprises contacting said polymer in liquid phase with aqueous strong base at elevated temperature for a time effective to hydrolyze said amide units to amine units.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said strong base comprises NaOH or KOH.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein said strong base is present in an amount of from 1 to 2 equivalents based on the equivalents of amide.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein said elevated temperature is from 110° C. to 170° C.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein said time is in the range of from 1 hour to 48 hours.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the polymer comprises N-vinylacetamide units.
Claim 8
Dependent Claim
11 words
The process of claim 5 wherein the polymer comprises N-vinylformamide units.
Claim 9
Dependent Claim
12 words
The process of claim 5 wherein the polymer comprises N-lower alkyl-N-vinylacetamide units.
Claim 10
Dependent Claim
10 words
The process of claim 5 wherein the polymer is poly(N-vinylacetamide).
Claim 11
Dependent Claim
48 words
The process of hydrolyzing poly(N-vinylacetamide) to poly(vinylamine) which comprises intimately contacting 7 to 15% by weight of said polymer with from 1.1 to 1.5 equivalents of NaOH in an aqueous reaction medium at a temperature of from 145° C. to 165° C. for from 3 to 12 hours.
Claim 12
Dependent Claim
48 words
The process of hydrolyzing poly(N-vinylacetamide) to poly(vinylamine) which comprises intimately contacting 7 to 15% by weight of said polymer with from 1.1 to 1.5 equivalents of NaOH in an aqueous reaction medium at a temperature of from 145° C. to 165° C. for from 3 to 12 hours.
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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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |