Low and ultra low density butyl constrained layer patches
AssigneeAdco Products, Inc.
InventorsPaul Fiero, Richard Foukes
Life of this patent
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Abstract
The present disclosure relates to use of a sound and vibration damping system for use in automotive, appliance and other applications. Specifically, the sound and vibration damping system includes an elastomeric layer prepared from a low density butyl based composition and a constraining layer. The low density butyl based composition comprises at least one polybutene, at least one butyl rubber and light weight fillers. The sound and vibration damping system of the present disclosure has a specific gravity less than 1.0 and a loss factor of not more than 0.4 at 20° F., 40° F. and 70° F. for frequencies of 200 Hz, 400 Hz and 800 Hz.
Claims15
A vibration and sound damping system comprising:
- an elastomeric layer, and
- a metallic constraining layer,
- wherein the elastomeric layer is prepared from an uncured, low density butyl composition with a specific gravity from 0.75 to 0.9, and
- wherein the system has a damping loss factor of less than 0.4 at 20° F., 40° F. and 70° F. for frequencies of 200 Hz, 400 Hz and 800 Hz.
Dependencies are inferred from the claim text.