Patent US3975347A successfully refreshed from Google Patents.
US3975347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear dimethylamine-epichlorohydrin copolymer
Assignee: ChampionX LLC
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Filing: 1974-11-11
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Granted: 1976-08-17
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Expires: 1994-11-11
Abstract
Abstract A process for preparing high molecular weight substantially linear condensaton polymers of lower aliphatic secondary amines and difunctional epoxide compounds in concentrations of from 60-85% by weight in aqueous solution is disclosed.
Inventors
- 👤 K. G. Phillips
- 👤 W. E. Zarnecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:02
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A process for the preparation of a 60 to 85% aqueous solution of a substantially linear polymer of a lower aliphatic secondary amine containing 2 to 8 carbon atoms having one amino group with an epihalohydrin said process comprising the steps of: A. heating a 50 to 90% aqueous solution of said lower aliphatic secondary amine to a temperature of 75°C to 95°C with agitation; and then, B. adding to said heated aqueous solution of a lower aliphatic secondary amine an epihalohydrin in a mole ratio of epihalohydrin to secondary amine from 0.75:1 to 1:1 at a rate sufficient to maintain the reaction temperature between 75°C to 95C with agitation whereby the concentration of the amine and epihalohydrin is from 60 to 85% by weight in an aqueous solution, and then, C. recovering said 60 to 85% solution of a substantially linear polymer of a lower aliphatic secondary amine and an epihalohydrin.
Claim 2
Dependent Claim
152 words
A process for the preparation of a 60 to 85% aqueous solution of a substantially linear polymer of a lower aliphatic secondary amine containing 2 to 8 carbon atoms having one amino group with an epihalohydrin said process comprising the steps of: A. heating a 50 to 90% aqueous solution of said lower aliphatic secondary amine to a temperature of 75°C to 95°C with agitation; and then, B. adding to said heated aqueous solution of a lower aliphatic secondary amine an epihalohydrin in a mole ratio of epihalohydrin to secondary amine from 0.75:1 to 1:1 at a rate sufficient to maintain the reaction temperature between 75°C to 95C with agitation whereby the concentration of the amine and epihalohydrin is from 60 to 85% by weight in an aqueous solution, and then, C. recovering said 60 to 85% solution of a substantially linear polymer of a lower aliphatic secondary amine and an epihalohydrin.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the molar ratio of the epihalohydrin to the secondary amine is 0.80:1.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the molar ratio of the epihalohydrin to the secondary amine is 1:1.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the molar ratio of epihalohydrin to the secondary amine is 0.87:1.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the lower aliphatic secondary amine is dimethylamine.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the temperature of reaction is about 80°C (176°F).
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |