US4414269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent resistant polysulfone and polyethersulfone compositions
Assignee: Boeing Co
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Filing: 1981-06-16
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Granted: 1983-11-08
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Expires: 2001-06-16
Abstract
Abstract Resins are prepared from polysulfone and polyethersulfone polymers that bear functional groups derived from compounds that are condensation products of amino-phenols and acid anhydrides. The polymers are prepared by coreacting aromatic compounds holding two hydroxyl groups, aromatic compounds holding two active halogen groups, and the condensation product of amino-phenol and acid anhydride, the condensation product holding one hydroxyl group. The resulting product has a molecular weight between about 1,000 and 40,000, preferably between about 5,000 and 30,000, and can be cross-linked to form a resin that is thermoplastic and solvent resistant.
Inventors
- 👤 Hyman R. Lubowitz
- 👤 Clyde H. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:04
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/44; C07D207/444; C07D207/448; C07D207/452; C07D209/00; C07D209/56; C07D209/80; C07D209/94; C08; C08G; C08G75/00; C08G75/20; C08G75/23; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J2381/00; C08J2381/06; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2549; Y10T442/2566
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A cross-linkable polysulfone or polyethersulfone polymer formed by reacting: ##STR40## wherein X is selected from the group consisting of ##STR41## R" is hydrogen or a lower alkyl, Z is selected from the group consisting of fluorine, chlorine, and bromine, R is an aromatic radical, R' is an aromatic radical, at least one of said aromatic radicals R and R' contains a diaryl radical wherein the aryl rings are connected by a sulfone linkage, and n is selected so that said polymer has a molecular weight between about 1,000 and about 40,000.
Claim 2
Dependent Claim
91 words
A cross-linkable polysulfone or polyethersulfone polymer formed by reacting: ##STR40## wherein X is selected from the group consisting of ##STR41## R" is hydrogen or a lower alkyl, Z is selected from the group consisting of fluorine, chlorine, and bromine, R is an aromatic radical, R' is an aromatic radical, at least one of said aromatic radicals R and R' contains a diaryl radical wherein the aryl rings are connected by a sulfone linkage, and n is selected so that said polymer has a molecular weight between about 1,000 and about 40,000.
Claim 3
Dependent Claim
10 words
A polymer according to claim 1, wherein Z is chlorine.
Claim 4
Dependent Claim
80 words
A polymer according to claim 1 or 2, wherein R is selected from the group consisting of ##STR42## R' is selected from the group consisting of ##STR43## E, E 1 , E 2 , and E 3 each represent substituent group selected from the group consisting of halogen, alkyl groups having 1 to 4 carbon atoms, and alkoxy groups having 1 to 4 carbon atoms, and a and b are each an integer having a value of 0 to 4.
Claim 5
Dependent Claim
25 words
A polymer according to claim 1 or 2, wherein n is selected so that said polymer has a molecular weight between about 5,000 and 30,000.
Claim 6
Dependent Claim
15 words
A prepreg formed by impregnating a fabric with the polymer of claim 1 or 2.
Claim 7
Dependent Claim
15 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 5.
Claim 8
Dependent Claim
41 words
A method for making the polymer of claim 1 or 2, comprising (a) mixing compounds (1), (2), and (3) and a scavenger in a solvent in the presence of an inert atmosphere, and (b) heating said mixture to react said compounds.
Claim 9
Dependent Claim
59 words
A method for making the polymer of claim 1 or 2, comprising (a) mixing compounds (1), (2), and (3) and a scavenger, said scavenger being selected from the group consisting of potassium carbonate, sodium carbonate, sodium hydroxide and potassium hydroxide, in a solvent in the presence of an inert atmosphere, and (b) heating said mixture to react said compounds.
Claim 10
Dependent Claim
21 words
A method according to claim 8, wherein said scavenger is selected from the group consisting of potassium carbonate and sodium carbonate.
Claim 11
Dependent Claim
54 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 5, said curing comprising the steps of vacuum bagging the prepreg and heating the vacuum bagged prepreg at an elevated temperature of about 450° F. to about 625° F. while under pressure ranging from vacuum pressure to about 200 psi.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |