Vibration damping superabsorbent composites
AssigneeHoechst Celanese Corporation
InventorsHarris A. Goldberg, Joseph M. Pickton, Joseph J. DiBiase, William T. Ryans
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Abstract
Vibration damping composites suitable for use in construction panels or constrained-layer elements are described. The composites include a viscoelastic gel prepared from 99.5-92.5 wt. % water and 0.5-7.5 wt. % of a superabsorbent polymer. Preferably, the polymer is of the carboxylic acid type and optionally includes starch or cellulose.
Claims6
A multilayer vibration-damping composite comprising in combination a plurality of moisture-impermeable sealing members defining a hermetically sealed cavity and disposed in said cavity a hydrogel consisting essentially of from about 99 to about 96 wt. % water and about 1 to about 4 wt. % superabsorbent resin, said superabsorbent resin comprising a carboxylic acid residue and a crosslinking agent to render said resin water-insoluble, wherein said hydrogel exhibits a storage modulus of greater than 10,000 dynes/cm.sup.2 at 25.degree. C. and a loss modulus of greater than 3,000 dynes/cm.sup.2 at 25.degree. C., said storage and loss modulus exhibiting the values recited above over a frequency range of from 0.1 radians/sec to 100 radians/sec.
Dependencies are inferred from the claim text.