Patent US4804424A successfully refreshed from Google Patents.
US4804424A
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Nitrate ester-miscible polyether polymers
Assignee: ATK Launch Systems LLC
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Filing: 1988-06-03
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Granted: 1989-02-14
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Expires: 2008-06-03
Abstract
Abstract Polyethers are formed by polymerizing oxetanes having one or two pendant groups which contain cyano moieties, particularly 3-cyanomethyl-3-methyl oxetane and 3,3-Bis(cyanomethyl) oxetane. The polyethers may also contain mer units derived from other cyclic ethers, including other oxetanes and tetrahydrofurans. The cyano group gives the polyether improved compatibility with nitrate ester plasticizers. The polyethers are curable with polyfunctional isocyanates to form binders for propellants, explosives or the like.
Inventors
- 👤 Jerald C. Hinshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G65/18; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C07; C07D; C07D305/00; C07D305/02; C07D305/04; C07D305/06; C08K; C08K5/00; C08K5/16; C08K5/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A propellant composition comprising between about 70 and about 85% solids, including fuel material particulates and oxidizer particulates, balance substantially a nitroester plasticizer and a binder, said binder comprising (1) a polyether having a functionality of about 2 or greater and having between about 20 and 100 molar percent mer units of the formula: ##STR5## wherein at least four of R 1 -R 6 are --H; one or two of R 1 -R 6 is --(CH 2 ) n --CN, wherein n is at least 1, and any remaining one of R 1 -R 6 is an alkyl group, balance mer units being residues of compounds selected from the group consisting of ethylene oxide, other oxetanes, tetrahydrofuran, substituted tetrahydrofuran, and mixtures thereof.
Claim 2
Dependent Claim
122 words
A propellant composition comprising between about 70 and about 85% solids, including fuel material particulates and oxidizer particulates, balance substantially a nitroester plasticizer and a binder, said binder comprising (1) a polyether having a functionality of about 2 or greater and having between about 20 and 100 molar percent mer units of the formula: ##STR5## wherein at least four of R 1 -R 6 are --H; one or two of R 1 -R 6 is --(CH 2 ) n --CN, wherein n is at least 1, and any remaining one of R 1 -R 6 is an alkyl group, balance mer units being residues of compounds selected from the group consisting of ethylene oxide, other oxetanes, tetrahydrofuran, substituted tetrahydrofuran, and mixtures thereof.
Claim 3
Dependent Claim
18 words
A composition in accordance with claim 1 wherein said balance mer units consist essentially of residues of tetrahydrofuran.
Claim 4
Dependent Claim
19 words
A composition according to claim 1 wherein R 3 is --CH 3 and R 4 is --CH 2 --CN.
Claim 5
Dependent Claim
18 words
A composition in accordance with claim 3 wherein said balance mer units consist essentially of residues of tetrahydrofuran.
Claim 6
Dependent Claim
17 words
A composition according to claim 1 wherein R 3 and R 4 are each --CH 2 --CN.
Claim 7
Dependent Claim
18 words
A composition in accordance with claim 5 wherein said balance mer units consist essentially of residues of tetrahydrofuran.
Claim 8
Dependent Claim
19 words
A composition according to claim 1 wherein the weight ratio of plasticizer to binder is a least about 2:1.
Claim 9
Dependent Claim
28 words
A composition according to claim 1 wherein said plasticizer is selected from the group comprising nitroglycerin: mono-, di-, and triethyleneglycerol trinitrate, butanetriol trinitrate, trimethylolethane trinitrate, and mixtures thereof.
References Cited (Backward Citations)
DE1570628A1
Cited
GB758450A
Cited
US3925505A
Cited
US4234364A
Cited
US4393199A
Cited
US4483978A
Cited
US4405762A
Cited
US4707540A
Cited
US4764586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |