Gas generating material for vehicle occupant protection device
AssigneeTRW Inc.
InventorHarold R. Blomquist
Life of this patent
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Abstract
An apparatus (10) comprises an inflatable vehicle occupant protection device (20) and a gas generating material (16) that, when ignited, produces gas to inflate the inflatable vehicle occupant protection device (20). The gas generating material (16) comprises a polyurethane thermoplastic elastomer and an inorganic salt oxidizer. The polyurethane elastomeric material comprises a physically cross-linked linear copolymer of an aromatic diisocyanate and a linear energetic polymer having a hydroxyl functionality of two or less.
Claims9
An apparatus comprising an inflatable vehicle occupant protection device and a gas generating material that, when ignited produces gas to inflate the inflatable vehicle occupant protection device, the gas generating material comprising:
- an inorganic oxidizer salt;
- and
- a thermoplastic elastomer, said thermoplastic elastomer consisting essentially of a polyurethane formed from aromatic diisocyanate, hydroxyl terminated glycidyl azide polymer with a hydroxyl functionality of two or less, and 2,4-pentanediol, wherein the amount of aromatic diisocyanate, hydroxyl terminated glycidyl azide polymer, and 2,4-pentanediol used to form the polyurethane are controlled so that the ratio of isocyanate groups to hydroxyl groups used to form the polyurethane is about 1.
An apparatus comprising an inflatable vehicle occupant protection device and a gas generating material that, when ignited produces gas to inflate the inflatable vehicle occupant protection device, the gas generating material comprising:
- about 65% to about 90%, by weight of the gas generating material, an inorganic oxidizer salt;
- and
- about 5% to about 35%, by weight of the gas generating material a thermoplastic elastomer, said thermoplastic elastomer being a polyurethane formed from 4,4′-methylene bis-phenylisocyanate, a hydroxyl terminated glycidyl azide polymer with a hydroxyl functionality of two or less, and 2,4 pentanediol, wherein the amount of 4,4′-methylene bis-phenylisocyanate, hydroxyl terminated glycidyl azide polymer, and 2,4-pentanediol used to form the polyurethane are controlled so that the ratio of isocyanate groups to hydroxyl groups used to form the polyurethane is about 1.
Dependencies are inferred from the claim text.