Gas generating composition

Abstract

The present invention provides a gas generating composition comprising: (a) a fuel; (b) an oxidizer; and (c) a compound selected from the group consisting of a double salt of phosphoric acid.

Description

[0001] This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 2005-34759 filed in Japan on Feb. 10, 2005 and 35 U.S.C. § 119(e) on U.S. Provisional Application No. 60 / 653105 filed on Feb. 16, 2005, which are incorporated by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a gas generating composition for an airbag restraint system for automobiles, etc., and a molded article thereof. [0004] 2. Description of the Related Art [0005] Compositions containing sodium azide have been widely used as a gas generating agent applied in the gas generator in air bags serving as vehicle occupant safety devices in the past. However, the toxicity of sodium azide in humans [LD50 (oral-rat)=27 mg / kg)] and danger during handling have been considered problematic, and safer gas generating compositions that contain various nitrogenous organic compounds, in other words, “non-azide gas generating compos...

AI Technical Summary

Benefits of technology

[0020] An example of the fuel of Component (a) used in the present invention includes at least one selected from tetrazole compounds, guanidine compounds, triazine compounds, and nitroamine compounds. The problems addressed by the present invention are solved and the effect of the invention can be obtained by using any of the items listed for Component (a).

[0021] Preferred tetrazole compounds are as follows: 5-aminotetrazole, ammonium salts of bitetrazole, and the like. Preferred guanidine compounds are as follows: nitrate salt of guanidine (guanidine nitrate), aminoguanidine nitrate, nitroguanidine, triaminoguanidine nitrate, and the like. Preferred triazine compounds are as follows: melamine, cyanuric acid, ammeline, ammelide, ammeland, and the like. The preferred nitroamine compounds include cyclo-1,3,5-trimethylene-2,4,6-trinitramine.

[0023] Preferably the oxidizer of Component (b), used in the present invention, includes at least one selected from Component (b-1) a basic metal nitrate, a nitrate salt, and ammonium nitrate; and Component (b-2) a perchlorate and chlorate. The problems addressed in the present invention are solved and the effect of the invention can be obtained by using any of the items listed for Component (b).

[0024] The basic metal nitrate salt of Component (b-1) includes at least one selected from basic copper nitrate, basic cobalt nitrate, basic zinc nitrate, basic manganese nitrate, basic iron nitrate, basic molybdenum nitrate, basic bismuth nitrate, and basic cerium nitrate.

[0025] To increase the burning rate, the average particle size of the basic metal nitrate is preferably 30 μm or less and more preferably 110 μm or less. The average particle size is measured by a particle size distribution method utilizing laser diffraction. A basic metal nitrate that has been dispersed in water, and then exposed to ultrasonic waves for 3 minutes is used as the measurement sample; the median particle size (D50) is determined, and the average of two measurements is considered to be the mean particle size.

[0026] The nitrate of Component (b-1) include alkali metal nitrates such as potassium nitrate, sodium nitrate, and alkaline earth metal nitrates such as strontium nitrate.

Problems solved by technology

However, the toxicity of sodium azide in humans [LD50 (oral-rat)=27 mg / kg)] and danger during handling have been considered problematic, and safer gas generating compositions that contain various nitrogenous organic compounds, in other words, “non-azide gas generating compositions,” have been developed as an alternative.