US3247171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for hydrolyzing a cross-linked acrylamide polymer and the product thereby
Assignee: Dow Chemical Co
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Filing: 1963-04-08
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Granted: 1966-04-19
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Expires: 1983-04-08
Abstract
No abstract record available.
Inventors
- 👤 Harold J Walker
- 👤 Pillepich John Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:58
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/52; C08F20/54; C08F20/56; B; B01; B01J; B01J19/00; B01J19/06; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS WHICH COMPRISES THE STEPS OF (A) POLYMERIZING IN WATER AT A TEMPEATURE WITHIN THE RANGE FROM ABOUT 25 TO ABOUT 90*C. IN THE PRESENCE OF A FREE RADICAL CATALYST FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED GROUPS AN AMOUNT OF ACRYLAMIDE WITHIN THE RANGE FROM ABOUT 2 TO ABOUT 20 PERCENT BY WEIGHT OF THE WATER AND FROM 0.005 TO ABOUT 0.5 MOLE PERCENT BASED ON THE MOLES OF ACRYLAMIDE OF A CROSS-LINKING MONOMER SOLUBLE IN DILUTE AQUEOUS SOLUTION OF ACRYLAMIDE AND HAVING TWO POLYMERIZABLE ETHYLENIC GROUPS AND (B) THEREAFTER HYDROLYZING THE POLYMER AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 50 TO ABOUT 90*C. WITH A SUFFICIENT AMOUNT OF AN ALKALI METAL HYDROXIDE TO CONVERT FROM ABOUT 20 TO 40 MOLE PERCENT OF THE AVAILABLE CARBOXAMIDE GROUPS TO ALKALI METAL CARBOXYLATE GROUPS.
Claim 2
Dependent Claim
134 words
A PROCESS WHICH COMPRISES THE STEPS OF (A) POLYMERIZING IN WATER AT A TEMPEATURE WITHIN THE RANGE FROM ABOUT 25 TO ABOUT 90*C. IN THE PRESENCE OF A FREE RADICAL CATALYST FOR THE POLYMERIZATION OF ETHYLENICALLY UNSATURATED GROUPS AN AMOUNT OF ACRYLAMIDE WITHIN THE RANGE FROM ABOUT 2 TO ABOUT 20 PERCENT BY WEIGHT OF THE WATER AND FROM 0.005 TO ABOUT 0.5 MOLE PERCENT BASED ON THE MOLES OF ACRYLAMIDE OF A CROSS-LINKING MONOMER SOLUBLE IN DILUTE AQUEOUS SOLUTION OF ACRYLAMIDE AND HAVING TWO POLYMERIZABLE ETHYLENIC GROUPS AND (B) THEREAFTER HYDROLYZING THE POLYMER AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 50 TO ABOUT 90*C. WITH A SUFFICIENT AMOUNT OF AN ALKALI METAL HYDROXIDE TO CONVERT FROM ABOUT 20 TO 40 MOLE PERCENT OF THE AVAILABLE CARBOXAMIDE GROUPS TO ALKALI METAL CARBOXYLATE GROUPS.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |