Basic metal nitrate, process for producing the same and gas generating agent composition

• US 8,613,821 B2
• Filed: 09/08/2010
• Issued: 12/24/2013
• Est. Priority Date: 09/27/1999
• Status: Expired due to Fees

• Current Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Original Assignee: Daicel Chemical Industries Limited (Daicel Corporation)
• Inventors: Zhou, Xingxi, Matsuoka, Kazuyuki, Wu, Jianzhou, Yamato, Yo, Takahori, Takeshi, Yamazaki, Kaoru
• Primary Examiner(s): MCDONOUGH, JAMES E
• Application Number:
  US12/877,632
• Publication Number:
  US 20100326574A1
• Time in Patent Office: 1,203 Days
• Field of Search: 149/19.7, 149/19, 149/2, 149/17, 149/88, 149/92, 149/109.2
• US Class Current: 149/19.7
• CPC Class Codes: C01B 21/48 Methods for the preparation of nitrates in general particular individual nitrates, see the relevant groups of subclasses C01B - C01G, according to the cation
• CPC Class Codes: C01G 1/08 Nitrates
• CPC Class Codes: C01G 3/08 Nitrates
• CPC Class Codes: C01P 2002/74 by peak-intensities or a ratio thereof only
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C06B 31/00 Compositions containing an inorganic nitrogen-oxygen salt
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

Provided is a basic metal nitrate suitable as an oxidizing agent for a gas generating agent, which is a basic metal nitrate having a good thermal stability and meeting at least one requirement of the following (a) to (d):

• • (a) a particle diameter of 0.5 to 40 μm; (b) a degree of crystallinity having 0.4 deg or less of a half band width of the peak in the X-ray analysis; (c) an initiation temperature of weight loss being 220° C. or higher according to TG-DTA analysis; and (d) an impurity content of 1,000 ppm or less based on Na atom. Further provided is a gas generating composition which has a low toxicity, a high burning rate and a low combustion temperature and which is used in a gas generator for an air bag. The gas generating composition comprises (a) tetrazole derivatives, guanidine derivatives or a mixture thereof, (b) a basic metal nitrate and (c) a binder and/or a slag-forming agent.

Claims

1. A molded single-perforated cylinder article having high thermal stability, wherein said molded article is a gas generating composition comprising:

(a) 32 weight-% nitroguanidine as a fuel,

(b) 60 weight-% basic copper nitrate as an oxidizing agent, and

(c) 8 weight-% sodium carboxymethylcellulose as a binder.

2. A molded single-perforated cylinder article having high thermal stability, wherein said molded article is a gas generating composition comprising:

(a) 44.2 weight-% nitroguanidine as a fuel,

(b) 52.8 weight-% basic copper nitrate as an oxidizing agent, and

(c) 3 weight-% guar gum as a binder.