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High Hysteresis Rubber

IP.com Disclosure Number: IPCOM000079573D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Johnson, DE: AUTHOR [+2]

Abstract

In the work on packed urethanes, high-density rigid polyurethanes were found to yield highly precise, long-wearing parts. By adjusting the equivalent weights and functionalities of the reactants, it is possible to develop parts with elastomeric properties, some of which had unusually high-damping properties.

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High Hysteresis Rubber

In the work on packed urethanes, high-density rigid polyurethanes were found to yield highly precise, long-wearing parts. By adjusting the equivalent weights and functionalities of the reactants, it is possible to develop parts with elastomeric properties, some of which had unusually high-damping properties.

The polyurethane rubbers described below have excellent damping qualities (high hysteresis) and in some cases, they are superior to butyl rubber. The urethanes are castable and high-density parts (densities of at least 1.2) can be formed in place or be prepared in unusual forms by using inexpensive molds. Such parts can also meet some structural needs. Generally, they can be better used between machine units to prevent vibrations from being transmitted from one area to another. The urethane will always fill the mold without any sink marks, because it is a very high-density foam. Molding rubbers like butyl cannot guarantee this. Urethanes are also more solvent and oil resistant than butyl rubbers.

Additionally, the urethane rubbers can be blown and will form high-damping foams of 30 density or less. Thus, it is possible to prepare light weight slabs that have good acoustical properties. By being made semiflexible, these slabs will hold their shape and not sag. Thus, by formulation, this product falls in the void between a foam and a solid rubber.

Examples 1-5.

Table 1 summarizes the formulations used to prepare these parts. TABLE 1

FORMU...