Patent ID: 8181417
Filing Date: 2012-05-22
Classification: B32B,E04B,E04F,G10K

Abstract:
1. A laminated, sound-absorbing structure which comprises: a layer of first non-metallic material having two surfaces, one of said two surfaces comprising an outer surface, said non-metallic material being selected from the group consisting of gypsum, plywood, wood, and cellulose-based materials; a layer of viscoelastic glue on the other of said two surfaces; and a layer of a second material over said viscoelastic glue; and further wherein said viscoelastic glue comprises an amount between 5% by weight and 15% by weight of a compound selected from the group consisting of butyl acrylate, methyl acrylate, styrene, and methacrylic acid 2-hydroxyethyl acrylate polymer.