US4618693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic organic phosphorus compound and process for producing same
Assignee: Sanko Kaihatsu Kagaku Kenkyusho KK
•
Filing: 1984-12-10
•
Granted: 1986-10-21
•
Expires: 2004-12-10
Abstract
Abstract A cyclic organic phosphorus compound useful as a stabilizer and a fire retardant for organic substances, particularly, high molecular weight compounds is provided, which compound is expressed by the formula (I): ##STR1## and further a process for producing the above compound (I) is provided, which process comprises reacting a compound expressed by the formula (II): ##STR2## with 1,4-benzoquinone.
Inventors
- 👤 Toranosuke Saito
- 👤 Masakatu Kitani
- 👤 Hiroyuki Ohishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5313; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657163; C07F9/657172
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A cyclic organic phosphorus compound expressed by the formula (I) ##STR6##
Claim 2
Dependent Claim
11 words
A cyclic organic phosphorus compound expressed by the formula (I) ##STR6##
Claim 3
Dependent Claim
76 words
A process for producing a cyclic organic phosphorus compound expressed by the formula (I) ##STR7## which process comprises reacting a compound expressed by the formula (II) ##STR8## with 1,4-benzoquinone in the absence of a catalyst and wherein said compound expressed by the formula (II) is reacted with 1,4-benzoquinone while a state is kept wherein the former compound is always present in an inert solvent in excess of an equivalent amount to that of the latter compound.
Claim 4
Dependent Claim
76 words
A process for producing a cyclic organic phosphorus compound expressed by the formula (I) ##STR7## which process comprises reacting a compound expressed by the formula (II) ##STR8## with 1,4-benzoquinone in the absence of a catalyst and wherein said compound expressed by the formula (II) is reacted with 1,4-benzoquinone while a state is kept wherein the former compound is always present in an inert solvent in excess of an equivalent amount to that of the latter compound.
References Cited (Backward Citations)
US2553417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |