US4476184A
Expired / Lapsed
US
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Thermally stable polysulfone compositions for composite structures
Assignee: Boeing Co
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Filing: 1983-08-09
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Granted: 1984-10-09
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Expires: 2003-08-09
Abstract
Abstract Resins are prepared from polymers that bear monofunctional or difunctional 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
2026-10-30 12:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2549; Y10T442/2566
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
76 words
A cross-linkable polymer formed by reacting: (1) 2 moles of A--OH (2) n+1 moles of Z--R--Z and (3) n moles of OH--R'--OH, wherein A is ##STR27## wherein m is 1 or 2, wherein Z is selected from the group consisting of fluorine, chlorine, and bromine, wherein R is an aromatic radical, wherein R' is an aromatic radical, and wherein n is selected so that said polymer has a molecular weight between about 1,000 and about 40,000.
Claim 2
Dependent Claim
76 words
A cross-linkable polymer formed by reacting: (1) 2 moles of A--OH (2) n+1 moles of Z--R--Z and (3) n moles of OH--R'--OH, wherein A is ##STR27## wherein m is 1 or 2, wherein Z is selected from the group consisting of fluorine, chlorine, and bromine, wherein R is an aromatic radical, wherein R' is an aromatic radical, and wherein n is selected so that said polymer has a molecular weight between about 1,000 and about 40,000.
Claim 3
Dependent Claim
30 words
The polymer of claim 1 wherein at least one of said aromatic radicals R and R' contains a diaryl radical wherein the aryl rings are connected by a sulfone linkage.
Claim 4
Dependent Claim
72 words
The polymer of claim 1 wherein R is selected from the group consisting of ##STR28## or mixtures thereof wherein E, E 1 , E 2 and E 3 each represent substituent groups 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 wherein a and b are each an integer having a value of 0 to 4.
Claim 5
Dependent Claim
13 words
A prepreg formed by impregnating a fabric with the polymer of claim 3.
Claim 6
Dependent Claim
15 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 4.
Claim 7
Dependent Claim
41 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 5 in the presence of a coreactant selected from the group consisting of: ##STR29## wherein R is an alkyl having 2-6 carbon atoms or an aromatic radical.
Claim 8
Dependent Claim
9 words
The polymer of claim 1 wherein Z is chlorine.
Claim 9
Dependent Claim
22 words
The polymer of claim 1 wherein n is selected so that said polymer has a molecular weight between about 5,000 and 30,000.
Claim 10
Dependent Claim
9 words
The polymer of claim 1 wherein A is ##STR30##
Claim 11
Dependent Claim
13 words
A prepreg formed by impregnating a fabric with the polymer of claim 1.
Claim 12
Dependent Claim
15 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 10.
Claim 13
Dependent Claim
43 words
A cured, solvent resistant, thermoplastic composite product formed by curing the prepreg of claim 11 in the presence of a coreactant selected from the group consisting of: ##STR31## wherein R is an alkyl having 2 to 6 carbon atoms or an aromatic radical.
Claim 14
Dependent Claim
39 words
A method for making the polymer of claim 1 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 15
Dependent Claim
24 words
The method of claim 13, wherein said scavenger is selected from the group consisting of potassium carbonate, sodium carbonate, sodium hydroxide and potassium hydroxide.
Claim 16
Dependent Claim
11 words
The method of claim 14, wherein the scavenger is potassium carbonate.
Claim 17
Dependent Claim
12 words
A compound having the formula: ##STR32## wherein m is 1 or 2.
Claim 18
Dependent Claim
12 words
A compound having the formula: ##STR32## wherein m is 1 or 2.
Claim 19
Dependent Claim
9 words
The compound of claim 16 wherein m is 1.
Claim 20
Dependent Claim
41 words
A method of synthesizing the compound of claim 16, comprising reacting 1 mole of a compound having the formula ##STR33## with a 1 mole of a compound having the formula ##STR34## in a solvent in the presence of an inert atmosphere.
Claim 21
Dependent Claim
6 words
A compound having the formula: ##STR35##
Claim 22
Dependent Claim
6 words
A compound having the formula: ##STR35##
Claim 23
Dependent Claim
36 words
A method of synthesizing the compound of claim 19, comprising reacting 2 moles of a compound having the formula: ##STR36## with 1 mole of a compound selected from the group of compounds having the formulas ##STR37##
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |