Polyurethane shock absorbing unit and said polyurethane

Details Polyurethane shock absorbing unit and said polyurethane Polyurethane shock absorbing unit and said polyurethane

1980-07-28

1982-01-19

Ives, P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

4284231, 428458, 525418, 213 7, 267138, B32B 2740, B61G 906

Patent

active

043117651

ABSTRACT:
Shock absorbing unit which comprises a shaped resilient polyurethane composition characterized by being able to withstand compressive cycling and particularly being characterized by retaining a high degree of rebound after a multitude of compressive cycling cycles. The unit is suitable for use in a railroad draft gear. Such polyurethane composition for said shock absorbing unit is prepared by reacting specifically selected polyols with a corresponding balance of 1,5-naphthalene diisocyanates in combination with mixtures of certain polymeric polyols with a manipulation of their molecular weights.

REFERENCES:
patent: 2933478 (1960-04-01), Young et al.
patent: 3467572 (1969-09-01), Ahramjian
patent: 4073858 (1978-02-01), Chung

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