Patent US4503254A successfully refreshed from Google Patents.
US4503254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making bis(halophenyl)hexafluoropropanes
Assignee: Raytheon Co
•
Filing: 1982-03-24
•
Granted: 1985-03-05
•
Expires: 2002-03-24
Abstract
Abstract A new process for preparing diphenyl derivatives of hexafluoropropane containing halogen substituents on the phenyl rings and new halogen-substituted diphenyl derivatives of hexafluoropropane prepared thereby are disclosed. The new compounds of this invention are useful as intermediates for the synthesis of high temperature polymer systems.
Inventors
- 👤 William J. Kelleghan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:40
CPC Classifications
C; C07; C07C; C07C25/00; C07C25/18; C07C17/00; C07C17/093; C07C17/16; C07C17/20; C07C17/202; C07C17/208
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A process for preparing a reactive monomer whose structure is ##STR2## where X is a halogen comprising the steps of: forming a reaction mixture by blending a triphenyl-phosphine dihalide reactant with a 2,2-bis(hydroxphenyl)hexafluoropropane reactant; and heating said mixture to at least 280° C. to promote a reaction between said reactants as evidenced by the evolution of a gaseous by-product, thereby forming a solid mixture of said monomer and triphenylphosphine oxide which may be subsequently separated to give high yields of said monomer.
Claim 2
Dependent Claim
82 words
A process for preparing a reactive monomer whose structure is ##STR2## where X is a halogen comprising the steps of: forming a reaction mixture by blending a triphenyl-phosphine dihalide reactant with a 2,2-bis(hydroxphenyl)hexafluoropropane reactant; and heating said mixture to at least 280° C. to promote a reaction between said reactants as evidenced by the evolution of a gaseous by-product, thereby forming a solid mixture of said monomer and triphenylphosphine oxide which may be subsequently separated to give high yields of said monomer.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein said mixture is first formed from a slurry of said dihalide in a low boiling hydrocarbon solvent to which said hexafluoropropane is added under an inert atmosphere.
Claim 4
Dependent Claim
28 words
The process of claim 2 where said solvent is stripped from said mixture by distillation and said mixture is subsequently heated to 350° C. to promote said reaction.
Claim 5
Dependent Claim
17 words
The process of claim 1 where said dihalide is triphenylphosphine dibromide and said hexafluoropropane is Bisphenol AF.
References Cited (Backward Citations)
SU276949A1
Cited
US3017440A
Cited
US3284518A
Cited
US3895074A
Cited
US4092363A
Cited
SU819114A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |