Spontaneously-firing explosive composition

• US 5,756,928 A
• Filed: 12/28/1994
• Issued: 05/26/1998
• Est. Priority Date: 12/28/1993
• Status: Expired due to Fees

• Current Assignee: Nippon Kayaku Company Limited
• Original Assignee: Nippon Kayaku Company Limited, Sentech Co., Ltd. (Omron Corporation)
• Inventors: Murakami, Masaharu, Taguchi, Michihisa, Ito, Yuji, Sato, Eishi, Kimura, Ayumu
• Primary Examiner(s): Miller, Edward A.
• Application Number:
  US08/365,105
• Time in Patent Office: 1,245 Days
• Field of Search: 149/195, 149/197, 149/83, 149/77, 149/19.1, 149/19.2, 149/19.5, 149/19.91, 149/37, 280/741, 102/205
• US Class Current: 149/7
• CPC Class Codes: B60R 2021/26029 Ignitors
• CPC Class Codes: B60R 2021/26064 characterised by auto-ignition means
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: C06B 33/06 the material being an inorganic oxygen-halogen salt
• CPC Class Codes: C06C 9/00 Chemical contact igniters; Chemical lighters
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: F42B 3/02 adapted to be united into assemblies
• CPC Class Codes: F42B 3/128 characterised by the composition of the pyrotechnic material

Abstract

A gas generator for an air bag is provided which contains a spontaneously-firing explosive composition in which at least one of a squib, igniting agent and a gas generant is contained in a casing formed of a light alloy material, the spontaneously-firing explosive composition containing carbohydrates, oxohalogenates and metal oxides or alternatively carbohydrates, oxohalogenates, metal oxides and one or more synthetic resins. The spontaneously-firing explosive composition has a spontaneous firing property in temperature range of either 165°-220° C. or 165°-200° C. The effective temperature range may be selected as needed.

Claims

1. A spontaneously-firing explosive composition having thermal stability, comprising carbohydrates, oxohalogenates and metal oxides, said metal oxides being selected from the group consisting of calcium oxide, magnesium oxide and zinc oxide, wherein at least one of said carbohydrates or oxohalogenates is coated with said metal oxides.

2. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, which is spontaneously fired at temperatures from 165°

C. to 220°

C.

3. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said carbohydrates are selected from the group consisting of sucrose, lactose, glucose, powder cellulose, dextrin and wood powder, wherein said oxohalogenates are selected from the group consisting of chlorates, perchlorates, bromates, perbromates, iodates and periodates.

4. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said carbohydrates have an average particle diameter of about 0.0001 to 0.5 mm.

5. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said oxohalogenates have an average particle diameter of about 0.0001 mm to 1.0 mm.

6. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said metal oxides have an average particle diameter of about 0.5 mm or less.

7. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said carbohydrates are used in an amount of about 1.0 to 95.0% by weight.

8. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said oxohalogenates are used in an amount of about 1.0 to 95.0% by weight.

9. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said metal oxides are used in an amount of about 0.01 to 30% by weight.

10. The spontaneously-firing explosive composition having thermal stability as claimed in claim 9, wherein said metal oxides are used in an amount of about 0.01 to 10% by weight.

11. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, wherein said metal oxides have an average particle diameter which is about 1/10 or smaller than the average particle diameter of said carbohydrates.

12. The spontaneously-firing explosive composition having thermal stability as claimed in claim 1, which further comprises a synthetic resin.

13. The spontaneously-firing explosive composition having thermal stability as claimed in claim 12, wherein said synthetic resin is selected from the group consisting of silicon resins, urethane resins, polyesters, acrylic resins and butyl rubber.

14. The spontaneously-firing explosive composition having thermal stability as claimed in claim 13, wherein said carbohydrates are selected from the group consisting of sucrose, lactose, glucose, powder cellulose, dextrin and wood powder, and wherein said oxohalogenates are selected from the group consisting of chlorates, perchlorates, bromates, perbromates, iodates and periodates.