Highly resilient polyurethane elastomer
AssigneeWestinghouse Electric Corp.
InventorsMorris A. Mendelsohn, Francis W. Navish, Jr.
Life of this patent
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Abstract
A resilient polyurethane elastomer structural member is made from (A) a prepolymer prepared from a composition consisting essentially of 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate, and about 0.23 mole to about 0.31 mole of a low molecular weight triol, per 1.0 mole of polyoxytetramethylene glycol, and (B) hydroquinone di-(.beta.-hydroxyethyl) ether, as a chain extender. This polyurethane elastomer can be used to make annular missile shock isolator pads useful for the land based, MX (Peacekeeper) missile.
Claims9
A highly resilient polyurethane elastomer structural member, comprising the cured admixture of:
- (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of:
- (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate,
- (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol having from 5 to 8 carbon atoms, and
- (3) 1.0 mole of polyoxytetramethylene glycol, with
- (B) 1.0 part by weight of a hydroquinone di-(.beta.-hydroxyethyl)ether acting as a chain extender.
A highly resilient polyurethane elastomer structural member in circumferential contact with a launchable missile, comprising the cured admixture of:
- (A) about 6.6 to about 7.2 parts by weight of a polyurethane prepolymer prepared from a composition consisting essentially of:
- (1) 2.60 moles to 2.80 moles of 4,4'-diphenylmethane diisocyanate,
- (2) about 0.23 mole to about 0.31 mole of a low molecular weight triol selected from the group consisting of trimethylol ethane, trimethylol propane, trimethylol butane, trimethylol pentane and mixtures thereof, and
- (3) 1.0 mole of polyoxytetramethylene glycol, with
- (B) 1.0 part by weight of hydroquinone di-(.beta.-hydroxyethyl)ether acting as a chain extender.
Dependencies are inferred from the claim text.