US4739030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Difunctional end-cap monomers
Assignee: Boeing Co
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Filing: 1986-01-06
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Granted: 1988-04-19
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Expires: 2006-01-06
Abstract
Abstract The solvent resistance of polysulfone, polyether sulfone, and polyesters is enhanced by using difunctional end-cap monomers of the present invention to provide improved crosslinking. The imidophenol monomers include two unsaturated functionalities capable of crosslinking upon thermal or chemical activation. Oligomer, oligomer blends, pregregs, and composites using the novel end caps are also described.
Inventors
- 👤 Hyman R. Lubowitz
- 👤 Clyde H. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071; C08G73/12; C08G75/00; C08G75/20; C08G75/23; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A difunctional end-cap monomer useful in the preparation of oligomers that are resistant to attack by organic solvents, comprising diimidophenols of the general formula: ##STR15## wherein Y= ##STR16## R 1 =lower alkyl, aryl, substituted aryl, lower alkoxy, or mixtures thereof; G=--SO 2 --, --S--, --CH 2 --, --O--; and j=0, 1, or 2.
Claim 2
Dependent Claim
53 words
A difunctional end-cap monomer useful in the preparation of oligomers that are resistant to attack by organic solvents, comprising diimidophenols of the general formula: ##STR15## wherein Y= ##STR16## R 1 =lower alkyl, aryl, substituted aryl, lower alkoxy, or mixtures thereof; G=--SO 2 --, --S--, --CH 2 --, --O--; and j=0, 1, or 2.
Claim 3
Dependent Claim
8 words
The monomer of claim 1 wherein Y= ##STR17##
Claim 4
Dependent Claim
13 words
The monomer of claim 1 wherein Y= ##STR18## and R"=hydrogen or lower alkyl.
Claim 5
Dependent Claim
8 words
The monomer of claim 1 wherein Y= ##STR19##
Claim 6
Dependent Claim
8 words
The monomer of claim 1 wherein Y= ##STR20##
Claim 7
Dependent Claim
8 words
The monomer of claim 1 wherein Y= ##STR21##
Claim 8
Dependent Claim
14 words
The monomer of claim 1 wherein Y= ##STR22## and G=--SO.sub.2 --, --S--, or --O--.
Claim 9
Dependent Claim
8 words
The monomer of claim 1 wherein Y= ##STR23##
References Cited (Backward Citations)
US4225497A
Cited
US4661604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |