Accession Number : ADD016572

Title :   Polyurethane-Acrylic Interpenetrating Polymer Network Acoustic Damping Material.

Descriptive Note : Patent, Filed 28 Aug 91, patented 12 Jul 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

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

Report Date : 12 Jul 1994

Pagination or Media Count : 6

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 percent by weight of the material, is made by polymerizing an aromatic diisocyanate with a polyalkylene ether glycol, and the hard polymer component is an acrylic polymer made by polymerization of the alkyl esters and alkylene diesters of acrylic and/or methacrylic acid, e.g. n-butyl methacrylate and tetramethylene glycol dimethacrylate. The curing of the mixture is carried out at room temperature.

Descriptors :   *ACOUSTICS, *DAMPING, *NETWORKS, *PATENTS, *URETHANES, *ACRYLIC ACID, ACIDS, CURING, ESTERS, ETHERS, GLYCOLS, MATERIALS, METHACRYLATES, MIXTURES, POLYMERIZATION, POLYMERS, ROOM TEMPERATURE, TEMPERATURE, WEIGHT, COMPOSITE MATERIALS, AROMATIC COMPOUNDS, ISOCYANATES, BUTYL RADICALS, METHYLENES

Subject Categories : Polymer Chemistry
      Acoustics
      Laminates and Composite Materials
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE