Patent US4284592A successfully refreshed from Google Patents.
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 15:53
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.
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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) | 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 |