US3920575A
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US
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Gas generating composition and method of preparing compression molded articles therefrom
Assignee: Asahi Kasei Corp
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Filing: 1974-02-21
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Granted: 1975-11-18
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Expires: 1994-02-21
Abstract
Abstract A gas generating composition comprising: I. at least one metal azide compound selected from the group consisting of alkali metal azides, alkaline earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n WHEREIN M represents magnesium, calcium, strontium, zinc, boron, aluminum, silicon, tin, titanium, zirconium, magnesium, chromium, cobalt or nickel; (M + N) REPRESENTS AN ATOMIC VALENCY OF M; and m and n represent a positive number, respectively, II. at least one oxidizing agent or a combustion composition comprising at least one oxidizing agent and at least one reducing agent; and III. at least one compound selected from the group consisting of a compound of the formula (Al2O3)p(MxO)q(SiO2)r.sH2O wherein M represents lithium, sodium, potassium, strontium, magnesium or calcium; x is 1 or 2; p and q represent zero or a positive number, respectively but p and q are not zero simultaneously; r is a positive number; and s is zero or a positive number, POTASSIUM CHLORIDE, POTASSIUM BROMIDE, CALCIUM CHLORIDE, SODIUM BROMIDE, STRONTIUM CHLORIDE AND STRONTIUM HYDROXIDE, IN AN AMOUNT OF FROM ABOUT 0.5 TO 30 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF THE TOTAL OF THE METAL AZIDE COMPOUND (I) and the oxidizing agent or the combustion composition (II). The composition generates non-toxic molecular nitrogen gas and is especially effective for producing compression-molded articles such as tablets.
Inventors
- 👤 Takehiko Shiki
- 👤 Ikuo Harada
- 👤 Tadamasa Harada
- 👤 Masaaki Shiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:09
CPC Classifications
C; C06; C06B; C06B35/00; C06D; C06D5/00; C06D5/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
27 words
AT LEAST ONE METAL AZIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AZIDES, ALKALINE EARTH METAL AZIDES AND HYDROXY METAL AZIDES HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
27 words
AT LEAST ONE METAL AZIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AZIDES, ALKALINE EARTH METAL AZIDES AND HYDROXY METAL AZIDES HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
5 words
A GAS GENERATING COMPOSITION COMPRISNG:
Claim 4
Dependent Claim
5 words
A GAS GENERATING COMPOSITION COMPRISNG:
Claim 5
Dependent Claim
27 words
A gas generating composition according to claim 1, wherein the metal azide compound is selected from the group consisting of strontium azide, barium azide and sodium azide.
Claim 6
Dependent Claim
58 words
A gas generating composition according to claim 1, wherein the oxidizing agent is selected from the group consisting of lithium perchlorate, potassium perchlorate, ammonium perchlorate, sodIum perchlorate, potassium chlorate, potassium bromate, potassium nitrate, barium nitrate, lithium peroxide, sodium peroxide, potassium peroxide, barium peroxide, lead peroxide, manganese dioxide, ferric oxide, ferrosoferric oxide, lead oxide, chromium trioxide and trilead tetraoxide.
Claim 7
Dependent Claim
28 words
A gas generating composition according to claim 1, wherein the reducing agent is selected from the group consisting of zirconium, magnesium, boron, aluminum, silicon, ferro-silicon, titanium and manganese.
Claim 8
Dependent Claim
43 words
A gas generating composition according to claim 1, wherein the compound of the formula (Al2O3)p(MxO)q(SiO2)r.sH2O is selected from the group consisting of (Na2O)q(SiO2)r.sH2O, (K2O)q(SiO2)r.sH2O, (Li2O)q(SiO)r.sH2O, (Al2O3)p(SiO2)r.sH2O, (MgO)q(SiO2)r.sH2O, (Al2O3)p(MgO)q(SiO2)r.sH2O, (Al2O3)p (K2O)q(SiO2)r.sH2O, (Al2O3)p(Na2O)q(SiO2)r.sH2O and (Al2O3)p(CaO)q(SiO2)r.sH2O wherein p, q and r, each is a positive number.
Claim 9
Independent Claim
249 words
A method of preparing gas generating compression-molded articles which comprises adding about 7 to 300 parts by weight of water to about 100 parts by weight of a gas generating composition comprising: I. at least one metal azide compound selected from the group consisting of alkali metal azides, alkaline earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n wherein M represents magnesium, calcium, strontium, zinc, boron, aluminum, silicon, tin, titanium, zirconium, magnesium, chromium, cobalt or nickel; (m + n) represents an atomic valency of M; and m and n represent a positive number, respectively, II. a least one oxidizing agent or a combustion composition comprising at least one oxidizing agent and at least one reducing agent; and III. at least one compound selected from the group consisting of a compound of the formula (Al2O3)p(MxO)q(SiO2)r.sH2O wherein M represents lithium, sodium, potassium, strontium, magnesium or calcium; x is 1 or 2; p and q represent zero or a positive number, respectively but p and q are not zero simultaneously; r is a positive number; and s is zero or a positive number, potassium chloride, potassium bromide, calcium chloride, sodium bromide, strontium chloride and strontium hydroxide, in an amount of from about 0.5 to 30 parts by weight based on 100 parts by weight of the total of the metal azide compound (I) and the oxidizing agent or the combustion composition (II), forming the resulting mixture into granules, drying the granules and subjecting the dried granules to compression molding.
Claim 10
Independent Claim
249 words
A method of preparing gas generating compression-molded articles which comprises adding about 7 to 300 parts by weight of water to about 100 parts by weight of a gas generating composition comprising: I. at least one metal azide compound selected from the group consisting of alkali metal azides, alkaline earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n wherein M represents magnesium, calcium, strontium, zinc, boron, aluminum, silicon, tin, titanium, zirconium, magnesium, chromium, cobalt or nickel; (m + n) represents an atomic valency of M; and m and n represent a positive number, respectively, II. a least one oxidizing agent or a combustion composition comprising at least one oxidizing agent and at least one reducing agent; and III. at least one compound selected from the group consisting of a compound of the formula (Al2O3)p(MxO)q(SiO2)r.sH2O wherein M represents lithium, sodium, potassium, strontium, magnesium or calcium; x is 1 or 2; p and q represent zero or a positive number, respectively but p and q are not zero simultaneously; r is a positive number; and s is zero or a positive number, potassium chloride, potassium bromide, calcium chloride, sodium bromide, strontium chloride and strontium hydroxide, in an amount of from about 0.5 to 30 parts by weight based on 100 parts by weight of the total of the metal azide compound (I) and the oxidizing agent or the combustion composition (II), forming the resulting mixture into granules, drying the granules and subjecting the dried granules to compression molding.
Claim 11
Dependent Claim
60 words
A method according to claim 6, wherein about 7 to 300 parts by weight of an organic medium soluble in or miscible with water selected from the group consisting of aliphatic alcohols having 1 to 6 carbon atoms, aliphatic ketones having 3 to 5 carbon atoms and aliphatic ethers having 2 to 5 carbon atoms is employed together with water.
Claim 12
Dependent Claim
54 words
A method according to claim 7, wherein the gas generating composition contains about 0.1 to 5 parts by weight of an alkaline compound selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, strontium hydroxide, barium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, strontium carbonate, lithium hydrogenbicarbonate, sodium hydrogenbicarbonate and potassium hydrogenbicarbonate.
Claim 13
Dependent Claim
40 words
A method according to claim 6, wherein the compound of the formula (Al2O3)p(MxO)q(SiO2)r.sH2O is selected from the group consisting of (Na2O)q(SiO2)r.sH2O, (K2O)q(SiO2)r.sH2O, (Li2O)q(SiO2)r.sH2O, (Al2O3)p(SiO2)r.sH2O, (MgO)q(SiO2)r.sH2O, (Al2O3)p(MgO)q(SiO2)r.SH2O, (Al2O3)p(K2O)q(SiO2)r.sH2O, (Al2O3)p(Na2O)q(SiO2)r.sH2O and (Al2O3)p(CaO)q(SiO2)r.sH2O wherein p, q and r, each is a positive number.
References Cited (Backward Citations)
US3718513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |