Occupant restraint system and composition useful therein

• US 4,981,534 A
• Filed: 03/07/1990
• Issued: 01/01/1991
• Est. Priority Date: 03/07/1990
• Status: Expired due to Term

• Current Assignee: Atlantic Research Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Atlantic Research Corporation (L3Harris Technologies, Inc.)
• Inventors: Scheffe, Robert S.
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Application Number:
  US07/489,968
• Time in Patent Office: 300 Days
• Field of Search: 149/19.91, 149/83, 149/85, 280/741
• US Class Current: 280/741
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators
• CPC Class Codes: C06B 45/10 the organic component containing a resin
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

A gas-generating composition of matter which burns to produce a non-toxic, non-corrosive, non-flammable combustion product. The composition comprises:

A. plasticized polyvinyl chloride fuel binder; and

B. certain inorganic oxidizer salts; and

C. lithium carbonate;

The oxidizer is present in an amount at least sufficient to convert all available carbon to carbon dioxide and to convert all available hydrogen to water and to fully oxidize all available alkaline earth metals.

The lithium carbonate is present in an amount at least sufficient to convert all available halogen to lithium halide.

The composition is useful to generate gas in a vehicle occupant restraint system.

Claims

1. A gas-generating composition of matter which burns to produce a non-toxic, non-corrosive, non-flammable combustion product, said composition of matter comprising:

A. plasticized polyvinyl chloride fuel binder; and

B. an inorganic oxidizer salt selected from the group consisting of;

alkali metal chlorates, alkali metal perchlorates, alkaline earth metal chlorates, alkaline earth metal perchlorates and mixtures thereof; and

C. lithium carbonate; and

wherein the oxidizer is present in an amount at least sufficient to convert all available carbon to carbon dioxide and to convert all available hydrogen to water and to fully oxidize all available alkaline earth metal; and

wherein the lithium carbonate is present in an amount at least sufficient to convert all available halogen to lithium halide.

2. The composition of claim 1 wherein the weight ratio of polyvinyl chloride to plasticizer is from about 1:

5 to 5;

1.

3. The composition of claim 1 wherein the weight ratio of polyvinyl chloride to plasticizer is from about 2:

3 to 3;

2.

4. The composition of claim 1 wherein the molar ratio of lithium carbonate to available halogen is from about 1:

1 to about 1.3;

1.

5. The composition of claim 1 wherein the oxidizer is potassium perchlorate.

6. An apparatus for minimizing injury to vehicle occupants in the event of sudden deceleration of the vehicle;

said apparatus comprising;

I. an uninflated, inflatable bag; and

II. a replaceable cartridige comprising;

(a) a container; and

(b) a high-pressure inert gas within the container; and

(c) a gas-generating composition within the container; and

III. means responsive to sudden deceleration of the vehicle for igniting the gas-generating composition of matter, for burning the gas generating composition thereby producing combustion products, for mixing these combustion products with the high pressure inert gas to form a warm gas mixture within the container and for utilizing this warm gas mixture to inflate the inflatable bag;

wherein the gas-generating composition comprises;

A. plasticized polyvinyl chloride fuel binder; and

B. an inorganic oxidizer salt selected from the group consisting of;

alkali metal chlorates, alkali metal perchlorates, alkaline earth metal chlorates, alkaline earth metal perchlorates and mixtures thereof; and

C. lithium carbonate; and

wherein the oxidizer is present in an amount at least sufficient to convert all available carbon to carbon dioxide and to convert all available hydrogen to water and to fully oxidize all available alkaline earth metal; and

wherein the lithium carbonate is present in an amount at least sufficient to convert all available halogen to lithium halide.

7. The apparatus of claim 6 wherein the inert gas is argon.

8. The apparatus of claim 6 wherein the inert gas is present at a pressure of from about 1000 to 5000 psi.

9. The apparatus of claim 6 wherein the inert gas is present at a pressure of from about 2500 to 3500 psi.