US4029529A
Expired / Lapsed
US
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Crosslinked carboxyl containing polymer and nitrocellulose as solid propellant binder
Assignee: United States Department of the Navy
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Filing: 1967-07-12
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Granted: 1977-06-14
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Expires: 1987-07-12
Abstract
Abstract An energetic binder composition of a carboxy polymer, such as an acrylic polymer, mixed with nitrocellulose and cross-linked with a multifunctional curing agent. A composite type propellant in which the energetic binder is combined with an oxidizer and process for preparation thereof.
Inventors
- 👤 Donald E. Elrick
- 👤 Harry Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:27
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
73 words
An energetic binder composition, particularly adaptable for use in a composite-modified double or single base propellant, which comprises the admixture of up to about 98.5% nitrocellulose with at least 1% of a carboxy polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams, said admixture being cross-linked with a multifunctional curing agent in an amount sufficient to improve the mechanical properties of the binder relative to the corresponding non-cross-linked binder.
Claim 2
Dependent Claim
73 words
An energetic binder composition, particularly adaptable for use in a composite-modified double or single base propellant, which comprises the admixture of up to about 98.5% nitrocellulose with at least 1% of a carboxy polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams, said admixture being cross-linked with a multifunctional curing agent in an amount sufficient to improve the mechanical properties of the binder relative to the corresponding non-cross-linked binder.
Claim 3
Dependent Claim
61 words
An energetic binder composition particularly adaptable for use in a composite-modified single or double base propellant, which comprises the admixture of up to about 98.5% nitrocellulose with at least 1% of an acrylic polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents per hundred grams, said admixture being cross-linked with at least 0.5% of a multifunctional curing agent.
Claim 4
Dependent Claim
61 words
An energetic binder composition particularly adaptable for use in a composite-modified single or double base propellant, which comprises the admixture of up to about 98.5% nitrocellulose with at least 1% of an acrylic polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents per hundred grams, said admixture being cross-linked with at least 0.5% of a multifunctional curing agent.
Claim 5
Dependent Claim
35 words
The energetic binder composition of claim 2 wherein the multifunctional curing agent is an epoxy resin selected from the group consisting of amino epoxy novalacs, condensation products of bisphenol A and epichlorohydrin, and cycloaliphatic epoxides.
Claim 6
Dependent Claim
17 words
The energetic binder composition of claim 3 wherein the multifunctional curing agent is N, N, O-tris epoxypropyl-p-aminophenol.
Claim 7
Dependent Claim
17 words
The energetic binder composition of claim 2 wherein the multifunctional curing agent is a multifunctional aziridinyl derivative.
Claim 8
Dependent Claim
14 words
The energetic binder composition of claim 5 wherein the curing agent is bis-(methyl-aziridinylethyl) sulfone.
Claim 9
Dependent Claim
51 words
The energetic binder composition of claim 2 wherein the acrylic polymer contains at least one monomer selected from the group consisting of the acid or lower alkyl ester of acrylic acid, methacrylic acid, sorbic acid, beta- acryloxpropionic acid, ethacrylic acid, 2-ethyl-3-propylacrylic acid, vinylacrylic acid, cinnamic acid, maleic acid and combinations thereof.
Claim 10
Dependent Claim
14 words
The energetic binder composition of claim 7 wherein the acrylic polymer is polyacrylic acid.
Claim 11
Dependent Claim
20 words
The energetic binder composition of claim 7 wherein the acrylic polymer is a copolymer of ethyl acrylate and acrylic acid.
Claim 12
Dependent Claim
43 words
The energetic binder composition of claim 7 wherein the acrylic polymer is a copolymer containing at least one non-acrylic monomer selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl methacrylate, styrene, acrylonitrile, methacrylonitrile, vinylidene chloride, butadiene, isoprene, 2,3-dimethyl butadiene and chloroprene.
Claim 13
Dependent Claim
26 words
The energetic binder composition of claim 2 wherein minor amounts of nitrocellulose stabilizers selected from the groups of resorcinol and 2-nitrodiphenylamine are present in the mixture.
Claim 14
Dependent Claim
34 words
The energetic binder composition of claim 2 wherein the nitrocellulose is present in amounts of from about 10-98.5 wt. % and the acrylic polymer is present in amounts of from about 1-33 wt. %.
Claim 15
Dependent Claim
91 words
A composite propellant composition comprising; a. a matrix of an energetic binder composition comprising the admixture of up to about 98.5% based on the weight of the binder of nitrocellulose with at least 1% based on the weight of the binder of an acrylic polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams, said admixture being cross-linked with at least 0.5% of a multifunctional curing agent, and b. containing within said matrix up to 85%, based on the weight of the propellant composition of a particulate oxidizer.
Claim 16
Dependent Claim
91 words
A composite propellant composition comprising; a. a matrix of an energetic binder composition comprising the admixture of up to about 98.5% based on the weight of the binder of nitrocellulose with at least 1% based on the weight of the binder of an acrylic polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams, said admixture being cross-linked with at least 0.5% of a multifunctional curing agent, and b. containing within said matrix up to 85%, based on the weight of the propellant composition of a particulate oxidizer.
Claim 17
Dependent Claim
80 words
A composite double base propellant composition comprising; a. a matrix of an energetic binder composition comprising the admixture of up to about 98.5% based on the weight of the binder of nitrocellulose with at least 1% based on the weight of the binder of a copolymer of ethyl acrylate and acrylic acid, said admixture being cross-linked with at least 0.5% of an amino epoxy novalac curing agent, and b. containing within said matrix up to 65% of a particulate oxidizer.
Claim 18
Dependent Claim
80 words
A composite double base propellant composition comprising; a. a matrix of an energetic binder composition comprising the admixture of up to about 98.5% based on the weight of the binder of nitrocellulose with at least 1% based on the weight of the binder of a copolymer of ethyl acrylate and acrylic acid, said admixture being cross-linked with at least 0.5% of an amino epoxy novalac curing agent, and b. containing within said matrix up to 65% of a particulate oxidizer.
Claim 19
Independent Claim
90 words
The method of preparing composite double base propellant compositions comprising; a. blending up to 98.5%, based on the weight of the binder, nitrocellulose with at least 1% based on the weight of the binder of a carboxy polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams with a multifunctional curing agent in a suitable casting solvent. b. admixing an oxidant in amounts of from 50%-85% based on the weight of the total composition, and c. curing the admixture for up to 14 days at 45°-60° C.
Claim 20
Independent Claim
90 words
The method of preparing composite double base propellant compositions comprising; a. blending up to 98.5%, based on the weight of the binder, nitrocellulose with at least 1% based on the weight of the binder of a carboxy polymer having a carboxyl equivalent of from about 0.03 to 0.06 equivalents/hundred grams with a multifunctional curing agent in a suitable casting solvent. b. admixing an oxidant in amounts of from 50%-85% based on the weight of the total composition, and c. curing the admixture for up to 14 days at 45°-60° C.
Claim 21
Dependent Claim
34 words
The method of claim 15 wherein the admixture is pretreated with solvent at 0°-30° C for 3 to 14 days prior to curing step (c) so as to swell and coalesce the casting powder.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |