US3800002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preventing the polymerization of conjugated dienes
Assignee: JSR Corp
•
Filing: 1971-03-09
•
Granted: 1974-03-26
•
Expires: 1991-03-09
Abstract
Abstract A process for preventing the polymerization of conjugated dienes in solvents at high temperatures comprising the addition of at least one compound selected from the group consisting of organic phosphoric acid esters of the specific general formula, pyridine, nuclear substituted derivatives of pyridine wherein the substituents are alkyl groups, quinoline, nuclear substituted derivatives of quinoline wherein the substituents are alkyl groups, and anthracene, to the solvent containing a conjugated diene as inhibitor.
Inventors
- 👤 S Shimokawa
- 👤 T Akimoto
- 👤 T Chikatsu
- 👤 Y Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A process for preventing the polymerization of butadiene in a solvent at elevated temperature characterized by the addition of at least one compound selected from the group consisting of organic phosphoric acid esters of the general formula
Claim 2
Dependent Claim
37 words
A process for preventing the polymerization of isoprene in a solvent at elevated temperature characterized by the addition of at least one compound selected from the group consisting of organic phosphoric acid esters of the general formula
Claim 3
Dependent Claim
52 words
A process for preventing the polymerization of conjugated dienes as defined in claim 1 wherein the organic phosphoric acid esters are triphenyl phosphate and nuclear substituted derivatives thereof wherein the substituents are alkyl groups, phenyl group or halogen atoms, trialkyl phosphates with or without substituted halogen atom, allylbiphenyl phosphate and diallylphenyl phosphate.
Claim 4
Dependent Claim
38 words
A process for preventing the polymerization of conjugated dienes as defined in claim 4 wherein the triphenyl phosphates and nuclear substituted derivatives thereof are triphenyl phosphate, tri(o-cresyl) phosphate, tri(m-cresyl) phosphate, tri(p-cresyl) phosphate, trixylenyl phosphate, tris(4-t-butylphenyl) phosphate, tris(o-biphenylyl) phosphate.
Claim 5
Dependent Claim
85 words
A process for preventing the polymerization of conjugated dienes as defined in claim 4 wherein the trialkyl phosphates and halogen substituted derivatives thereof are trimethyl phosphate, triethyl phosphate, tri(n)propyl phosphate, tri(i)propyl phosphate, tri(n)butyl phosphate, tri(sec)butyl phosphate, tri(n)amyl phosphate, trihexyl phosphate, triheptyl phosphate, trioctyl phosphate and other organic phosphoric acid esters wherein the alkyl groups have from 1 to 8 carbon atoms; and tri(2-chloroethyl) phosphate, tri(2-bromoethyl) phosphate, tri(3-chloropropyl) phosphate, tri(3-bromopropyl) phosphate, tri(3-iodopropyl) phosphate, tri(2,3-dichloropropyl) phosphate, tri(2, 3-dibromopropyl) phosphate, tri(2,3-diiodopropyl) phosphate, tri(4-chlorobutyl) phosphate, tri(4-bromobutyl) phosphate, tri(4-iodobutyl) phosphate.
Claim 6
Dependent Claim
32 words
A process for preventing the polymerization of conjugated dienes as defined in claim 4 wherein the organic phosphoric acid esters which contain phenyl and allyl groups are diallylphenyl phosphate and allylbiphenyl phosphate.
Claim 7
Dependent Claim
42 words
The process of claim 1 wherein a known polymerization inhibitor or antioxidant for unsaturated compounds selected from the group consisting of sodium nitrite, potassium nitrite, sodium sulfide, a phenolic compound and an aromatic amine compound is used as a second polymerization inhibitor.
Claim 8
Dependent Claim
22 words
A process for preventing the polymerization of conjugated dienes as defined in claim 8 wherein the second polymerization inhibitor is sodium nitrite.
Claim 9
Dependent Claim
37 words
A process for preventing the polymerization of conjugated dienes in solvents at high temperature characterized by the addition of at least one compound selected from the group consisting of organic phosphoric acid esters of the general formula
Claim 10
Dependent Claim
13 words
The process of claim 10 wherein the second polymerization inhibitor is sodium nitrite.
References Cited (Backward Citations)
US2613175A
Cited
US3047503A
Cited
US3215720A
Cited
US3340160A
Cited
US3265751A
Cited
US3448015A
Cited
US3558470A
Cited
US3565855A
Cited
US3567682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |