US4722984A
Expired / Lapsed
US
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Pentacyanocobaltate(II) catalytic chain transfer agents for molecular weight control in free radical polymerization
Assignee: EIDP Inc
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Filing: 1986-10-14
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Granted: 1988-02-02
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Expires: 2006-10-14
Abstract
Abstract A process for preparing low molecular weight methacrylate polymer and copolymer with a pentacyanocobaltate(II) catalytic chain transfer agent is disclosed.
Inventors
- 👤 Andrew H. Janowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:42
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F20/00; C08F20/02; C08F20/10; C08F20/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
A process for free radical polymerization of unsaturated monomer wherein molecular weight control is effected by means of a catalytic chain transfer agent, comprising: contacting unsaturated monomer comprising methacrylate monomer with a catalytically effective amount of a free radical initiator in the presence of a pentacyanocobaltate(II) catalytic chain transfer agent having the formula M.sub.3 Co(CN).sub.5 wherein M is selected from the group consisting of Li + , Na + , K + , NH 4 + , R 4 N + ; R is C x H 2x+1 or C 6 H 5 ; and x is an integer from 1 to 10, inclusive.
Claim 2
Dependent Claim
104 words
A process for free radical polymerization of unsaturated monomer wherein molecular weight control is effected by means of a catalytic chain transfer agent, comprising: contacting unsaturated monomer comprising methacrylate monomer with a catalytically effective amount of a free radical initiator in the presence of a pentacyanocobaltate(II) catalytic chain transfer agent having the formula M.sub.3 Co(CN).sub.5 wherein M is selected from the group consisting of Li + , Na + , K + , NH 4 + , R 4 N + ; R is C x H 2x+1 or C 6 H 5 ; and x is an integer from 1 to 10, inclusive.
Claim 3
Dependent Claim
29 words
A process as defined in claim 1, wherein the pentacyanocobaltate(II) catalytic chain transfer agent is present in a concentration of from about 1.0×10 -6 to about 7.7×10 -4 M.
Claim 4
Dependent Claim
28 words
A process as defined in claim 2, wherein the pentacyanocobaltate(II) chain transfer agent is present in a concentration of from about 1.0×10 -5 to about 7.0×10 -4 M.
Claim 5
Dependent Claim
13 words
A process as defined in claim 3, wherein M is K + .
Claim 6
Dependent Claim
20 words
A process as defined in claim 4, wherein the unsaturated monomer contains at least about 50 mole percent methacrylate monomer.
Claim 7
Dependent Claim
18 words
A process as defined in claim 5, wherein the process is conducted in the absence of molecular oxygen.
Claim 8
Dependent Claim
64 words
A process as defined in claim 4, wherein the unsaturated monomer comprises a methacrylate monomer having the formula ##STR2## wherein X is COOR or CN, and R is a moiety selected from the group consisting of C 6 H 5 , allyl, glycidal, hydroxyalkyl, allyloxyethyl, 2,4-hexadienyl, dialkyl aminoalkyl, and C z H 2z+1 , where z is an integer from 1 to 12, inclusive.
Claim 9
Dependent Claim
20 words
A process as defined in claim 7, wherein the unsaturated monomer contains at least about 50 mole percent methacrylate monomer.
Claim 10
Dependent Claim
18 words
A process as defined in claim 8, wherein the process is conducted in the absence of molecular oxygen.
References Cited (Backward Citations)
US2383425A
Cited
US4526945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |