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US4680352A
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Cobalt (II) chelates as chain transfer agents in free radical polymerizations
Assignee: EIDP Inc
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Filing: 1986-01-27
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Granted: 1987-07-14
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Expires: 2006-01-27
Abstract
Abstract Free radical polymerization processes employing cobalt(II) chelates of vicinal iminohydroxyimino compounds, diazadihydroxyiminodialkyldecadienes and -undecadienes, tetraazatetraalkylcyclotetradecatetraenes and -dodecatetraenes, N,N'-bis(salicylidene)ethylenediamines and dialkyldiazadioxodialkyldodecadienes and -tridecadienes as catalytic chain transfer agents for controlling the molecular weight of the homopolymers and copolymers produced.
Inventors
- 👤 Andrew H. Janowicz
- 👤 Lester R. Melby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:39
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
41 words
In an improved free radical polymeriation of acrylic and/or styrene monomers wherein molecular weight control is effected by means of a chain transfer agent, the improvement characterized in that the chain transfer agent is a cobalt chelate of the formula ##STR5##
Claim 2
Dependent Claim
41 words
In an improved free radical polymeriation of acrylic and/or styrene monomers wherein molecular weight control is effected by means of a chain transfer agent, the improvement characterized in that the chain transfer agent is a cobalt chelate of the formula ##STR5##
Claim 3
Dependent Claim
153 words
wherein each R, independently, is phenyl or C 1 to C 12 alkyl wherein each a-carbon atom contains two hydrogen atoms, or R and R on adjacent carbon atoms, taken together, is C 5 to C 8 cycloalkylene, unsubstituted in the a-positions; R 2 is H or C x H 2x+1 wherein x is 1 to 12; each R 3 , independently, is H or C 1 to C 12 branched or straight alkyl; R 7 is 0 or NH; n is 2 or 3; and X - is NO 3 - , Cl - , Br - , I - , BF 4 - , PF 6 - , SbF 6 - or R 1 COO - wherein R 1 is C 1 to C 12 alkyl; provided, however, each of either or both aromatic rings in VIII optionally is substituted with a benzo group and optionally contains up to four substituents.
Claim 4
Dependent Claim
153 words
wherein each R, independently, is phenyl or C 1 to C 12 alkyl wherein each a-carbon atom contains two hydrogen atoms, or R and R on adjacent carbon atoms, taken together, is C 5 to C 8 cycloalkylene, unsubstituted in the a-positions; R 2 is H or C x H 2x+1 wherein x is 1 to 12; each R 3 , independently, is H or C 1 to C 12 branched or straight alkyl; R 7 is 0 or NH; n is 2 or 3; and X - is NO 3 - , Cl - , Br - , I - , BF 4 - , PF 6 - , SbF 6 - or R 1 COO - wherein R 1 is C 1 to C 12 alkyl; provided, however, each of either or both aromatic rings in VIII optionally is substituted with a benzo group and optionally contains up to four substituents.
Claim 5
Dependent Claim
11 words
Process of claim 1 which is carried out at 50°-150° C.
Claim 6
Dependent Claim
11 words
Process of claim 2 which is carried out at 80°-110° C.
Claim 7
Dependent Claim
29 words
Process of claim 3 which is carried out in the presence of an initiator selected from the group consisting of azocumene; 2,2'-azobis(isobutyronitrile); 2,2'-azobis (2-methyl)butanenitrile; 4,4'-azobis(4-cyanovaleric acid); and 2 (t-butylazo)-2-cyanopropane.
Claim 8
Dependent Claim
12 words
Process of claim 1 wherein an organic solvent provides a polymerization medium.
Claim 9
Dependent Claim
10 words
Process of claim 1 wherein a single monomer is homopolymerized.
Claim 10
Dependent Claim
10 words
Process of claim 6 wherein the monomer is methyl methacrylate.
Claim 11
Dependent Claim
9 words
Process of claim 6 wherein the monomer is styrene.
Claim 12
Dependent Claim
11 words
Process of claim 1 wherein a mixture of comonomers is copolymerized.
Claim 13
Dependent Claim
10 words
Process of claim 9 wherein the mixture includes methyl methacrylate.
Claim 14
Dependent Claim
9 words
Process of claim 9 wherein the mixture includes styrene.
Claim 15
Dependent Claim
41 words
Process of claim 1 wherein the substituents in VIII are selected from --OR 2 , --NR 2 2 , --C1, --Br, --I, --NO 2 and --R 5 wherein R 5 is C x H 2x+1 wherein x is 1 to 12.
Claim 16
Dependent Claim
12 words
Process of claim 1 wherein the cobalt chelate is of structure VI.
References Cited (Backward Citations)
US4526945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |