Accession Number : ADD015889

Title :   Interpenetrating Polymer Network Acoustic Damping Material.

Descriptive Note : Patent, Filed 28 Aug 91, patented 6 Jul 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Sorathia, Usman A ; Yeager, William L ; Dapp, Timothy L

Report Date : 06 Jul 1993

Pagination or Media Count : 5

Abstract : Improved acoustic damping materials comprise interpenetrating polymer networks having a soft polymer component and a hard polymer component. The soft polymer component, constituting from 50 to 90, preferably 70, percent by weight of the material, is made by polymerizing an aromatic diisocyanate with a polyalkylene ether glycol, and the hard polymer component is a vinyl ester polymer made by polymerization of a vinyl ester resin such as the acrylate or methacrylate ester of the diglycidyl ether of a polyphenol. Optionally, the vinyl ester resin may be brominated, whereby increased fire retardance is conferred upon the interpenetrating polymer network. The mixture is cured at room temperature.

Descriptors :   *ACOUSTICS, *DAMPING, *NETWORKS, *POLYMERS, *PATENTS, ACRYLATES, ESTERS, ETHERS, GLYCOLS, MATERIALS, METHACRYLATES, MIXTURES, PLASTICS, POLYMERIZATION, WEIGHT, PENETRATION, AROMATIC COMPOUNDS, VINYL RADICALS, PHENOLS, BROMINATION, FIRES

Subject Categories : Polymer Chemistry
      Fluid Mechanics
      Acoustics
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE