Patent US3954664A successfully refreshed from Google Patents.
US3954664A
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Addition polymerization process
Assignee: ConocoPhillips Co
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Filing: 1972-01-10
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Granted: 1976-05-04
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Expires: 1992-01-10
Abstract
Abstract A polymerization catalyst consisting of a cupric salt, a copper chelating agent, and a cyanide salt is disclosed for polymerizing vinyl monomers. Such a catalyst system is less hazardous than are the persulfate and peroxide catalysts; the molecular weight of the polymer is higher under comparable polymerization conditions; and the catalyst is not consumed by certain impurities which react with the prior art catalyst.
Inventors
- 👤 Donald R. Napier
- 👤 Paul H. Washecheck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:48
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/44; C08F4/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A free radical catalyst system consisting essentially of a copper salt which yields the cupric ion in aqueous solution, a copper (II) chelating agent and a water soluble cyanide selected from the group consisting of an alkali metal cyanide, alkaline earth metal cyanide, ammonium cyanide and tetramethyl ammonium cyanide.
Claim 2
Dependent Claim
49 words
A free radical catalyst system consisting essentially of a copper salt which yields the cupric ion in aqueous solution, a copper (II) chelating agent and a water soluble cyanide selected from the group consisting of an alkali metal cyanide, alkaline earth metal cyanide, ammonium cyanide and tetramethyl ammonium cyanide.
Claim 3
Dependent Claim
40 words
The catalyst system of claim 1 wherein said chelating agent is present in an amount sufficient to chelate all of the copper, and the cyanide salt is present in a molar ratio of cyanide to copper of at least 2:1.
Claim 4
Dependent Claim
29 words
The catalyst system of claim 2 wherein the cyanide molar ratio to the copper is present in the range of 2 to 6 mols cyanide to 1 mol copper.
Claim 5
Dependent Claim
19 words
The catalyst system of claim 1 wherein the copper chelating agent has a log K stability constant above 4.
Claim 6
Dependent Claim
66 words
A free radical catalyst system consisting essentially of a copper salt which yields the cuperic ion in aqueous solution and is selected from the group consisting of cupric chloride, cupric sulfate, cupric acetate or cupric nitrate; a copper (II) chelating agent and a water soluble cyanide selected from the group consisting of an alkali metal cyanide, alkaline earth metal cyanide, ammonium cyanide and tetramethyl ammonium cyanide.
Claim 7
Dependent Claim
66 words
A free radical catalyst system consisting essentially of a copper salt which yields the cuperic ion in aqueous solution and is selected from the group consisting of cupric chloride, cupric sulfate, cupric acetate or cupric nitrate; a copper (II) chelating agent and a water soluble cyanide selected from the group consisting of an alkali metal cyanide, alkaline earth metal cyanide, ammonium cyanide and tetramethyl ammonium cyanide.
Claim 8
Dependent Claim
41 words
The catalyst system of claim 5 wherein the copper (II) chelating agent is ethylenediamine-tetraacetic acid sodium salt, cyclohexanediamine-tetraacetic acid sodium salt, tartaric acid sodium salt, citric acid sodium salt, nitrilotriacetic acid sodium salt, phenanthroline, acetoacetic acid sodium salt, ammonia or acetylacetone.
Claim 9
Dependent Claim
40 words
The catalyst system of claim 6 wherein the chelating agent is present in an amount at least sufficient to chelate all of the copper and the cyanide is present in at least a molar ratio of 2/1, cyanide to copper.
Claim 10
Dependent Claim
30 words
The catalyst system of claim 7 wherein the copper salt is cupric chloride, the copper (II) chelating agent is ethylenediamine tetraacetic acid sodium salt, and the cyanide is sodium cyanide.
Claim 11
Dependent Claim
29 words
The catalyst system of claim 7 wherein the copper salt is cupric sulfate, the copper (II) chelating agent is nitrilotriacetic acid sodium salt, and the cyanide is sodium cyanide.
Claim 12
Dependent Claim
24 words
The catalyst system of claim 7 wherein the copper salt is cupric acetate, the copper (II) chelating agent is cyclohexanediamine tetraacetic acid sodium salt.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |