US4039527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsymmetrical azonitriles
Assignee: Fujifilm Wako Pure Chemical Corp
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Filing: 1974-10-10
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Granted: 1977-08-02
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Expires: 1994-10-10
Abstract
Abstract Unsymmetrical azonitriles of the formula, ##STR1## wherein R 1 , R 2 , R 3 and R 4 are independently straight- or branched-chain alkyl having 1 to 7 carbon atoms or alkoxy substituted straight- or branched-chain alkyl having 2 to 11 carbon atoms but at least one of R 1 and R 2 and at least one of R 3 and R 4 must be different, have good efficiency as initiator for polymerizations or copolymerizations of vinyl monomers. These unsymmetrical azonitriles can be prepared by oxidizing a corresponding unsymmetrical hydrazo compound.
Inventors
- 👤 Joji Nagaoka
- 👤 Kazuhiko Yamashita
- 👤 Nobuaki Minamii
- 👤 Tsutomu Miyagawa
- 👤 Masahiko Sugano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/002; C09B62/006; C09B62/0061; C07; C07C; C07C255/00; C07C255/63; C07C255/65
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
An unsymmetrical azonitrile of the formula ##STR18## wherein R 1 , R 2 , R 3 and R 4 are independently straight- or branched-chain alkyl having 1 to 7 carbon atoms or alkoxy substituted straight- or branched-chain alkyl having 2 to 11 carbon atoms provided that R 1 is different than R 3 when R 2 is the same as R 4 and R 1 is different than R 4 when R 2 is the same as R 3 .
Claim 2
Dependent Claim
80 words
An unsymmetrical azonitrile of the formula ##STR18## wherein R 1 , R 2 , R 3 and R 4 are independently straight- or branched-chain alkyl having 1 to 7 carbon atoms or alkoxy substituted straight- or branched-chain alkyl having 2 to 11 carbon atoms provided that R 1 is different than R 3 when R 2 is the same as R 4 and R 1 is different than R 4 when R 2 is the same as R 3 .
Claim 3
Dependent Claim
10 words
An unsymmetrical azonitrile according to claim 1, which is ##STR19##
Claim 4
Dependent Claim
10 words
An unsymmetrical azonitrile according to claim 1, which is ##STR20##
Claim 5
Dependent Claim
10 words
An unsymmetrical azonitrile according to claim 1, which is ##STR21##
Claim 6
Dependent Claim
10 words
An unsymmetrical azonitrile according to claim 1, which is ##STR22##
Claim 7
Dependent Claim
57 words
A composition containing an unsymmetrical azonitrile as claimed in claim 1 and symmetrical azonitriles of the formulas ##STR23## and ##STR24## wherein R 1 , R 2 , R 3 and R 4 are independently straight- or branched-chain alkyl having 1 to 7 carbon atoms or alkoxy substituted straight- or branched-chain alkyl having 2 to 11 carbon atoms.
Claim 8
Dependent Claim
20 words
A composition according to claim 6, wherein the unsymmetrical azonitrile is 2-(1-cyano-1,3-dimethylbutylazo)-4-methoxy-2,4-dimethyl-valeronitrile and the symmetrical azonitriles are 2,2'-azobis(2,4-dimethylvaleronitrile) and 2,2'-azobis(4-methoxy-2,4dimethylvaleronitrile).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |