Ignition enhancer coating compositions for azide propellant

• US 4,244,758 A
• Filed: 05/15/1978
• Issued: 01/13/1981
• Est. Priority Date: 05/15/1978
• Status: Expired due to Term

• Current Assignee: Allied Chemical Corporation (Honeywell International Inc.)
• Original Assignee: Allied Chemical Corporation (Honeywell International Inc.)
• Inventors: Hamilton, Brian K., Garner, Eugene F.
• Primary Examiner(s): Miller, Edward A.
• Application Number:
  US05/905,828
• Time in Patent Office: 974 Days
• Field of Search: 149/19.6, 149/19.7, 149/19.91, 149/35, 149/77, 149/82, 149/83, 149/85, 149/7
• US Class Current: 149/7
• CPC Class Codes: C06B 45/32 the coating containing an organic compound
• CPC Class Codes: C06C 9/00 Chemical contact igniters; Chemical lighters

Abstract

An ignition enhancer coating composition for alkali metal azide pyrotechnic propellant compositions comprised of about 2 to 15 weight percent of an oxygen-containing polymeric compound; about 20 to 50 weight percent of an alkali metal azide; and about 40 to 80 weight percent of an inorganic oxidizer. This invention also relates to a pyrotechnic propellant coated with said ignition enhancer composition.

Claims

1. An ignition enhancer composition for coating alkali metal azide-based pyrotechnic propellants which comprises:

(a) about 2 to 15 weight percent of a combustible oxygen-containing polymeric compound selected from the group consisting of cellulose acetate resins and polyvinyl acetate resins;

(b) about 20 to 50 weight percent of an alkali metal azide; and

(c) about 40 to 80 weight percent of an inorganic oxidizer;

wherein all weight percents are based on the total weight of the ignition enhancer composition.

2. The composition of claim 1 wherein the oxygen-containing polymeric compound is polyvinyl acetate.

3. The composition of claim 1 wherein the inorganic oxidizer is selected from the group consisting of sodium chlorate, potassium chlorate, sodium perchlorate and potassium perchlorate.

4. The composition of claim 2 wherein the inorganic oxidizer is sodium perchlorate.

5. The composition of claim 1 wherein the alkali metal azide is sodium azide or potassium azide.

6. The composition of claim 4 wherein the alkali metal azide is sodium azide.

7. The composition of claim 1 wherein:

(a) the combustible oxygen-containing polymeric compound is polyvinyl acetate in an amount of about 6 to 10 weight percent;

(b) the alkali metal azide is sodium azide in an amount of about 25 to 35 weight percent; and

(c) the inorganic oxidizer is sodium perchlorate in an amount of about 55 to 65 weight percent.

8. An azide-based pyrotechnic propellant composition suitable for use in inflating an inflatable device, said composition comprising said propellant coated with an ignition enhancer composition, said ignition enhancer composition comprising:

(a) about 2 to 15 weight percent of a combustible oxygen-containing polymeric compound selected from the group consisting of cellulose acetate and polyvinyl acetate resins;

(b) about 20 to 50 weight percent of an alkali metal azide; and

(c) about 40 to 80 weight percent of an inorganic oxidizer;

wherein all weight percents are based on the total weight of the ignition enhancer composition.