Patent US3734876A successfully refreshed from Google Patents.
US3734876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked polyalkylene oxide
Assignee: Union Carbide Corp
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Filing: 1971-07-06
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Granted: 1973-05-22
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Expires: 1991-07-06
Abstract
Abstract A process for chemically cross-linking poly(alkylene oxide) of molecular weight of at least 100,000 which comprises contacting said poly(alkylene oxide) with a suitable cross-linking agent in the presence of a solvent and a free radical catalyst, at a temperature and for a time sufficient to cross-link said poly(alkylene oxide), said poly(alkylene oxide) being present in said solvent in an amount within the range of from about 1 percent to about 10 percent by weight based on the weight of the solvent.
Inventors
- 👤 N Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
A process according to claim 1 wherein the crosslinking agent is polyethylene glycol diacrylate.
Claim 2
Dependent Claim
14 words
A process according to claim 1 wherein the crosslinking agent is 1,4-butylene glycol diacrylate.
Claim 3
Dependent Claim
38 words
A process according to claim 1 wherein said poly(alkylene oxide) is present in said solvent in an amount within the range of about 2 percent to about 8 percent by weight based on the weight of said solvent.
Claim 4
Dependent Claim
13 words
A process according to claim 1 wherein the poly(alkylene oxide) is poly(ethylene oxide).
Claim 5
Dependent Claim
11 words
A process according to claim 1 wherein the solvent is benzene.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein the free radical catalyst is acetylperoxide.
Claim 7
Dependent Claim
26 words
A process according to claim 1 wherein said poly(alkylene oxide) and cross-linking agent are contacted at temperatures within the range of about 50*C. to about 100*C.
Claim 8
Dependent Claim
31 words
A process according to claim 1 wherein said cross-linking agent is employed in an amount of about 0.5 to about 12 weight percent based on the weight of the poly(alkylene oxide).
Claim 9
Dependent Claim
82 words
A process for chemically cross-linking poly(ethylene oxide) having a molecular weight of at least 100,000 which comprises contacting said poly(ethylene oxide) with polyethylene glycol diacrylate in the presence of acetyl peroxide and benzene at a temperature within the range of about 50*C. to about 100*C. for a time sufficient to crosslink said poly(ethylene oxide), said poly(ethylene oxide) being present in said benzene in an amount of about 1 percent to about 10 percent by weight based on the weight of said benzene.
Claim 10
Dependent Claim
35 words
A process according to claim 10 wherein said poly(ethylene oxide) is present in said benzene in an amount of about 2 percent to about 8 percent by weight based on the weight of said benzene.
References Cited (Backward Citations)
US3417064A
Cited
US3345347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |