Gas generant for air bag

• US 6,497,774 B2
• Filed: 12/20/2000
• Issued: 12/24/2002
• Est. Priority Date: 07/22/1996
• Status: Expired due to Term

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Matsuda, Naoki, Yamato, Yo, Hirata, Norimasa, Takahori, Takeshi, Yokoyama, Takushi
• Primary Examiner(s): Carone, Michael J.
• Assistant Examiner(s): FELTON, AILEEN BAKER
• Application Number:
  US09/739,809
• Publication Number:
  US 20010000383A1
• Time in Patent Office: 734 Days
• Field of Search: 149/61, 149/45, 149/46, 149/88, 149/109.6
• US Class Current: 149/45
• CPC Class Codes: C06B 45/00 Compositions or products which are defined by structure or arrangement of component of product explosive charges of particular form or shape F42B1/00, F42B3/00
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

A gas-generant-molded-article for air bags which is prepared by molding a gas generant composition into a cylindrical form containing an opening hole, wherein the relationship between the linear burning velocity r (mm/second) of said gas generant composition under a pressure of 70 kgf/cm² and a thickness W (mm) of said molded article falls within a range represented by 0.005≦W/(2·r)≦0.3, with the linear burning velocity preferably falling within a range of from 1 to 12.5 mm/second.

Claims

1. A gas generant composition for air bags, comprising:

(a) about 30 to 40% by weight of nitroguanidine,

(b) about 40 to 65% by weight of an oxidizing agent, and

(c) about 3 to 12% by weight of a binder.

2. An inflater system containing as a gas generant therein, the gas generant composition for air bags as recited in claim 1.

5. The gas generant composition for air bags as recited in claim 1, which further comprises (d) about 1 to 20% by weight of a slag-forming agent.

6. The gas generant composition for air bags as recited in claim 5, in which the slag-forming agent is selected from the group consisting of a naturally produced clay comprising aluminosilicate as the principal component, artificial clay and mica.

7. The gas generant composition for air bags as recited in claim 1 or 5, wherein the binder is a polysaccharide derivative selected from the group consisting of a metal salt of carboxymethyl cellulose, a hydroxyethyl cellulose, a cellulose acetate, a cellulose propionate, a cellulose acetate butyrate, a nitrocellulose and a starch.

8. The gas generant composition for air bags as recited in claim 1 or 5, wherein the oxidizing agent comprises an alkali metal nitrate or an alkaline earth metal nitrate.

9. The gas generant composition for air bags as recited in claim 5, comprising:

(a) about 30 to 40% by weight of nitroguanidine,

(b) about 40 to 65% by weight of strontium nitrate,

(c) about 3 to 7% by weight of Japanese acid clay and

(d) about 3 to 12% by weight of sodium carboxymethyl cellulose.

10. The gas generant composition for air bags as recited in claim 5, in which the slag-forming agent comprises Japanese acid clay.

3. A gas generant propellant composition for a vehicle air bag, which contains therein about 1-20 wt. % of Japanese acid clay, based on the total weight of the composition.

4. The gas generant propellant composition recited in claim 3, wherein said composition further contains 3-12 wt. % of a water soluble polysaccharide derivative, based on the total weight of the composition.