Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
1999-11-17
2001-09-18
Vollano, Jean F. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C564S058000
Reexamination Certificate
active
06291711
ABSTRACT:
The invention relates to a new compound suitable for use as an explosive. More specifically, the invention concerns a new dinitramide salt. The salt can be used as a high explosive, propellant or gas-generating compound in gas generators in pure form or as a component in explosive compositions.
The preparation of dinitramide salts such as ADN (ammonium dinitramide) and KDN (potassium dinitramide) is disclosed in, for instance, WO 91/19669, WO 91/19670, WO 93/16002 and WO 97/06099. These dinitramide salts are, in the first place, intended to be used as oxidizers, e.g. to replace ammonium perchlorate, in explosive compositions. The absence of chlorine is advantageous from the viewpoint of air pollution and in military applications owing to a decreased exhaust gas signature.
An object of the present invention is to provide a compound which is suitable as an explosive, which contains the dinitramide ion, which has low solubility in water and low impact and friction sensitivity.
A further object of the invention is to provide a homogeneous propellant which contains the dinitramide ion and which has good pressing properties.
One more object of the invention is to provide a compound which is suitable as a gas-generating compound in gas generators for vehicle safety equipment, such as airbags.
The invention is defined in the claims.
According to the invention the compound consists of guanylurea dinitramide having the formula
and referred to as GUDN.
The invention also concerns an explosive containing the compound; a propellant containing the compound; a pressed rocket motor charge containing the compound as the main component, and use of the compound as a gas-generating compound in gas generators for vehicles safety equipment, such as airbags.
GUDN is a white crystalline powder which has low solubility in water, has no melting point and has a decomposition temperature of about 180° C. The crystal size may vary according to the conditions of preparation. The powder is pressable and can be pressed to, for instance, propellant grains and rocket motor charges of different shape. The burning properties are favorable. The burning rate is high and linearly dependent on pressure, the formed combustion gases are light. GUDN is highly insensitive to impact and friction. When testing the impact sensitivity in a BAM fall hammer with a fall weight of 2 kg, the compound was not initiated even when the fall height was increased to 2 m. For comparison, it may be mentioned that RDX at a corresponding fall weight is initiated at a fall height of 38 cm. The friction sensitivity could not be tested in a normal Julius Peter friction tester since the compound was not initiated within the capacity range of the tester (36 kp pistil load).
REFERENCES:
patent: 2953448 (1960-09-01), Maxwell
patent: 3758555 (1973-09-01), Koshar et al.
patent: 5659080 (1997-08-01), Suzuki et al.
patent: 6004410 (1999-12-01), Blomquist
patent: 0 519 485 (1992-12-01), None
patent: 0 607 446 (1994-07-01), None
patent: 91/19669 (1991-12-01), None
patent: 91/19670 (1991-12-01), None
patent: 93/16002 (1993-08-01), None
patent: 96/26169 (1996-08-01), None
patent: 97/06099 (1997-02-01), None
CA:125:225967 abs of DE 19505568, Aug. 1996.*
CA::118:84038 abs of EP 519485, Dec. 1992.
Jacobson & Holman PLLC
Totalforsvarets Forskningsinstitut (FOI)
Vollano Jean F.
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