US3984264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane coatings for solid propellant ingredients
Assignee: United States Department of the Army
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Filing: 1969-04-01
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Granted: 1976-10-05
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Expires: 1989-04-01
Abstract
Abstract This patent describes high energy propellant ingredients in particulate form containing thereon a crosslinked siloxane polymer envelope or coating from an organic hydrolyzable silane having a functionality greater than 2. This patent also describes a method of providing a cross-linked siloxane polymer coating on finely divided high energy propellant ingredients by suspending the finely divided ingredients in an inert solvent, introducing therein a hydrolyzable organic silane having a functionality greater than 2 and subsequently isolating the polymer coated product in a dry free-flowing particulate form after stripping of the solvent.
Inventors
- 👤 Bernard B. Lampert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:24
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B45/20; C06B45/22; C06B21/00; C06B21/0083; C06B45/04; C06B45/06; C06B45/10; C06B45/30; C06B45/32
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
42 words
A high energy propellant ingredient selected from the group consisting of ammonium perchlorate, cyclotetramethylenetetranitramine, ammonium nitrate, cyclotetramethylenetrinitramine and propellants containing same, in particle form containing thereon a crosslinked siloxane polymer coating from a hydrolyzable organic silane having a functionality greater than 2.
Claim 2
Dependent Claim
42 words
A high energy propellant ingredient selected from the group consisting of ammonium perchlorate, cyclotetramethylenetetranitramine, ammonium nitrate, cyclotetramethylenetrinitramine and propellants containing same, in particle form containing thereon a crosslinked siloxane polymer coating from a hydrolyzable organic silane having a functionality greater than 2.
Claim 3
Dependent Claim
25 words
Ammonium perchlorate in particle form containing thereon a crosslinked N-substituted amino alkyltrialkoxysiloxane coating from a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 4
Dependent Claim
25 words
Ammonium perchlorate in particle form containing thereon a crosslinked N-substituted amino alkyltrialkoxysiloxane coating from a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 5
Dependent Claim
34 words
A high energy propellant ingredient selected from the group consisting of ammonium perchlorate, cyclotetramethylenetetranitramine, ammonium nitrate, cyclotetramethylenetrinitramine and propellants containing same, in particle form containing thereon a crosslinked siloxane polymer coating of hydrolyzed N-beta-(aminoethyl)-gamma-aminopropyltrimethoxy-silane.
Claim 6
Dependent Claim
34 words
A high energy propellant ingredient selected from the group consisting of ammonium perchlorate, cyclotetramethylenetetranitramine, ammonium nitrate, cyclotetramethylenetrinitramine and propellants containing same, in particle form containing thereon a crosslinked siloxane polymer coating of hydrolyzed N-beta-(aminoethyl)-gamma-aminopropyltrimethoxy-silane.
Claim 7
Independent Claim
57 words
The method of providing a crosslinked siloxane polymer coating on a finely divided high energy propellant ingredient which comprises suspending the finely divided ingredient in an inert solvent, introducing therein a hydrolyzable organic silane having a functionality greater than 2, and subsequently isolating the finely divided product in a dry free-flowing form after stripping of the solvent.
Claim 8
Independent Claim
57 words
The method of providing a crosslinked siloxane polymer coating on a finely divided high energy propellant ingredient which comprises suspending the finely divided ingredient in an inert solvent, introducing therein a hydrolyzable organic silane having a functionality greater than 2, and subsequently isolating the finely divided product in a dry free-flowing form after stripping of the solvent.
Claim 9
Independent Claim
57 words
The method of providing a crosslinked siloxane polymer coating on a finely divided high energy propellant oxidizer which comprises suspending the finely divided oxidizer in an inert solvent, introducing therein a hydrolyzable organic silane having a functionality greater than 2, and subsequently isolating the finely divided product in a dry free-flowing form after stripping of the solvent.
Claim 10
Independent Claim
57 words
The method of providing a crosslinked siloxane polymer coating on a finely divided high energy propellant oxidizer which comprises suspending the finely divided oxidizer in an inert solvent, introducing therein a hydrolyzable organic silane having a functionality greater than 2, and subsequently isolating the finely divided product in a dry free-flowing form after stripping of the solvent.
Claim 11
Independent Claim
57 words
A method of increasing burning rate and slope of a solid propellant which comprises coating the propellant oxidizer selected from the group consisting of perchlorates and nitrates with up to 10 wt% of a basic, polyfunctional N-substituted amino alkyltrialkoxysilane hydrolyzing the silane to provide a N-substituted amino alkyltrialkoxysiloxane polymer, and incorporating said oxidizer in a solid propellant.
Claim 12
Independent Claim
57 words
A method of increasing burning rate and slope of a solid propellant which comprises coating the propellant oxidizer selected from the group consisting of perchlorates and nitrates with up to 10 wt% of a basic, polyfunctional N-substituted amino alkyltrialkoxysilane hydrolyzing the silane to provide a N-substituted amino alkyltrialkoxysiloxane polymer, and incorporating said oxidizer in a solid propellant.
Claim 13
Independent Claim
48 words
A method of increasing burning rate and slope of an ammonium perchlorate which comprises coating the ammonium perchlorate with up to 10 wt% of a basic, polyfunctional N-substituted amino alkyltrialkoxysilane hydrolyzing the silane to provide a crosslinked siloxane polymer and incorporating said ammonium perchlorate in a solid propellant.
Claim 14
Independent Claim
48 words
A method of increasing burning rate and slope of an ammonium perchlorate which comprises coating the ammonium perchlorate with up to 10 wt% of a basic, polyfunctional N-substituted amino alkyltrialkoxysilane hydrolyzing the silane to provide a crosslinked siloxane polymer and incorporating said ammonium perchlorate in a solid propellant.
Claim 15
Independent Claim
32 words
A method of preserving the ultrafine particle size of a high energy propellant ingredient which comprises coating the ingredient with up to 3 wt% of a hydrolyzable polyfunctional N-substituted amino alkyltrialkoxysilane silane.
Claim 16
Independent Claim
32 words
A method of preserving the ultrafine particle size of a high energy propellant ingredient which comprises coating the ingredient with up to 3 wt% of a hydrolyzable polyfunctional N-substituted amino alkyltrialkoxysilane silane.
Claim 17
Independent Claim
40 words
A method of preserving the ultrafine particle size of an ammonium perchlorate which comprises coating the ammonium perchlorate with up to 3 wt% of a polyfunctional N-substituted amino alkyltrialkoxysilane silane, and hydrolyzing the silane to provide a crosslinked siloxane polymer.
Claim 18
Independent Claim
40 words
A method of preserving the ultrafine particle size of an ammonium perchlorate which comprises coating the ammonium perchlorate with up to 3 wt% of a polyfunctional N-substituted amino alkyltrialkoxysilane silane, and hydrolyzing the silane to provide a crosslinked siloxane polymer.
Claim 19
Dependent Claim
40 words
A novel high energy solid propellant comprising a binder and an oxidizer therefor in particle form containing thereon a crosslinked amino containing siloxane polymer coating obtained from a hydrolysis of an N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 20
Dependent Claim
40 words
A novel high energy solid propellant comprising a binder and an oxidizer therefor in particle form containing thereon a crosslinked amino containing siloxane polymer coating obtained from a hydrolysis of an N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 21
Dependent Claim
45 words
A novel high energy solid propellant comprising a binder and an oxidizer therefor in said oxidizer being particle form and comprising ammonium perchlorate containing thereon a crosslinked amino containing siloxane polymer coating obtained from a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 22
Dependent Claim
45 words
A novel high energy solid propellant comprising a binder and an oxidizer therefor in said oxidizer being particle form and comprising ammonium perchlorate containing thereon a crosslinked amino containing siloxane polymer coating obtained from a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2.
Claim 23
Independent Claim
61 words
The method of providing a crosslinked siloxane polymer coating on a finely divided propellant ingredient which comprises suspending said ingredient in an inert solvent, introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, portionwise to the agitated mixture, and isolating the product as a dry, free-flowing powder after complete reaction, by stripping the reaction mixture under reduced pressure.
Claim 24
Independent Claim
61 words
The method of providing a crosslinked siloxane polymer coating on a finely divided propellant ingredient which comprises suspending said ingredient in an inert solvent, introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, portionwise to the agitated mixture, and isolating the product as a dry, free-flowing powder after complete reaction, by stripping the reaction mixture under reduced pressure.
Claim 25
Dependent Claim
11 words
The method of claim 12 wherein the solvent is methylene chloride.
Claim 26
Dependent Claim
12 words
The method of claim 12 wherein the solvent is n-heptane also benzene.
Claim 27
Independent Claim
58 words
The method of preparing a propellant which comprises adding an oxidizer to a propellant binder in a propellant mixer, introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, activating the mixer blades, and when reaction is complete, applying a vacuum to remove volatiles prior to addition of the other solid ingredients to the propellant mix.
Claim 28
Independent Claim
58 words
The method of preparing a propellant which comprises adding an oxidizer to a propellant binder in a propellant mixer, introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, activating the mixer blades, and when reaction is complete, applying a vacuum to remove volatiles prior to addition of the other solid ingredients to the propellant mix.
Claim 29
Dependent Claim
48 words
The process which comprises suspending a solid in a propellant plasticizer, in a propellant mixer introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, activating the mixer blades, and when reaction is complete, applying vacuum to remove volatiles prior to addition of the other ingredients.
Claim 30
Dependent Claim
48 words
The process which comprises suspending a solid in a propellant plasticizer, in a propellant mixer introducing a hydrolyzable N-substituted amino alkyltrialkoxysilane having a functionality greater than 2, activating the mixer blades, and when reaction is complete, applying vacuum to remove volatiles prior to addition of the other ingredients.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |