US4284592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion inhibitors
Assignee: Imperial Metal Industries Kynoch Ltd
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Filing: 1980-01-15
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Granted: 1981-08-18
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Expires: 2000-01-15
Abstract
Abstract A double base propellant charge is primed with a dimethyl siloxane resin before application of a silicone elastomer inhibitor to the primed surface. There may be a barrier coating, preferably of a polyvinyl acetal resin, between the double base material and the primer.
Inventors
- 👤 Geoffrey I. Evans
- 👤 Stuart Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:37
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12; C06B21/00; C06B21/0083
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A method of priming a body of gas producing material comprising nitrocellulose and an energetic nitric ester plasticiser therefor to facilitate bonding a silicone elastomer combustion inhibitor to a surface thereof which is to be inhibited, said method comprising the steps of: (a) coating said surface with a solution of a polyvinyl acetal, said solution containing a cross-linking agent and having dispersed therein a particulate metal, and causing or allowing the coating to cure, (b) applying to the coating formed in step (a) a coating of a solution of a siloxane resin, said resin having been formed by hydrolysis of a mixture comprising 92-94% by weight of difunctional chlorosilanes and 6-8% by weight of trifunctional chlorosilanes, said solution containing a cross-linking agent for the resin, and causing or allowing the coating to cure.
Claim 2
Independent Claim
133 words
A method of priming a body of gas producing material comprising nitrocellulose and an energetic nitric ester plasticiser therefor to facilitate bonding a silicone elastomer combustion inhibitor to a surface thereof which is to be inhibited, said method comprising the steps of: (a) coating said surface with a solution of a polyvinyl acetal, said solution containing a cross-linking agent and having dispersed therein a particulate metal, and causing or allowing the coating to cure, (b) applying to the coating formed in step (a) a coating of a solution of a siloxane resin, said resin having been formed by hydrolysis of a mixture comprising 92-94% by weight of difunctional chlorosilanes and 6-8% by weight of trifunctional chlorosilanes, said solution containing a cross-linking agent for the resin, and causing or allowing the coating to cure.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein said polyvinyl acetal is a polyvinyl formal.
Claim 4
Dependent Claim
22 words
A method according to claim 2, wherein the solution used in step (a) is a solution of a polyvinyl formal in tetrahydrofuran.
Claim 5
Dependent Claim
26 words
A method according to claim 2 or claim 3, wherein the cross-linking agent for the polyvinyl formal is selected from methyl methoxy uron or titanium acetylacetonate.
Claim 6
Dependent Claim
13 words
A method according to claim 1, wherein said particulate metal is powdered aluminium.
Claim 7
Dependent Claim
43 words
A method according to claim 1, wherein the solution used in step (a) comprises about 100 parts by weight tetrahydrofuran, about 10 parts by weight aluminium powder, about 5 parts by weight polyvinyl formal and about 0.25 parts by weight methyl methoxy uron.
Claim 8
Dependent Claim
26 words
A method according to claim 1, wherein the siloxane resin applied in step (b) is applied in solution in a solvent selected from toluene or isopropanol.
Claim 9
Dependent Claim
23 words
A method according to claim 1, wherein the cross-linking agent for the siloxane resin is selected from dibutyl tin dilaurate or lead octoate.
Claim 10
Dependent Claim
16 words
A method according to claim 1, wherein said silanes used in step (b) are methyl chlorosilanes.
Claim 11
Dependent Claim
51 words
A method of inhibiting combustion of a body of gas producing material comprising nitrocellulose and an energetic nitric ester plasticizer therefor comprising the steps of priming the surface thereof to be inhibited by the method of claim 1 and applying a layer of a silicone resin inhibitor to the primed surface.
Claim 12
Dependent Claim
38 words
A method according to claim 10, wherein the inhibitor layer is applied to said primed surface in the form of a liquid siloxane polymer containing a cross-linking agent and the layer is then caused or allowed to cure.
Claim 13
Dependent Claim
15 words
A method according to claim 10 wherein said siloxane polymer is a polymethyl siloxane resin.
Claim 14
Dependent Claim
14 words
A combustion inhibited gas-producing material when made by the method according to claim 10.
Claim 15
Dependent Claim
14 words
A rocket motor including, as propellant, a combustion-inhibited gas-producing material according to claim 12.
References Cited (Backward Citations)
US3190776A
Cited
US3260631A
Cited
US4004523A
Cited
US3999382A
Cited
US3958417A
Cited
US3985592A
Cited
US3673287A
Cited
GB1255132A
Cited
US3679781A
Cited
GB1312576A
Cited
GB1342802A
Cited
US3773572A
Cited
US3889463A
Cited
US3961476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |