Sound Insulating Material

Abstract

The present invention provides a sound insulating material excellent in sound insulation property and moldability. The sound insulating material of the present invention contains an inorganic compound in a thermoplastic resin foam and is characterized by containing the inorganic compound in an amount of from 30 to 300 parts by weight per 100 parts by weight of the thermoplastic resin constituting the thermoplastic resin foam. Therefore, it has excellent sound insulation property and moldability. In addition, because the sound insulating material can be formed accurately into a shape in conformity with the shape of a sound-insulated member to which sound insulation treatment is intended to be applied using a known molding method, it can be adhered stably to, for example, automobile floor materials and sound-insulated members such as partition walls separating an engine room and the vehicle interior, almost without forming any gap between the sound insulating material and the sound-insulated member and it is possible to subject the sound-insulated member to sound insulation treatment certainly.

1 . A sound insulating material comprising a thermoplastic resin foam and an inorganic compound contained in the thermoplastic resin foam in an amount of from 30 to 300 parts by weight per 100 parts by weight of the thermoplastic resin constituting the thermoplastic resin foam. 
     
     
         2 . The sound insulating material according to  claim 1 , wherein the thermoplastic resin constituting the thermoplastic resin foam is a polyolefin-based resin. 
     
     
         3 . The sound insulating material according to  claim 1 , wherein the inorganic compound is a metal salt of an inorganic acid. 
     
     
         4 . The sound insulating material according to  claim 1 , wherein the sound insulating material has an apparent density of from 0.1 to 0.8 g/cm 3 . 
     
     
         5 . The sound insulating material according to  claim 1 , wherein the inorganic compound is contained in an amount of from 75 to 250 parts by weight per 100 parts by weight of the thermoplastic resin constituting the thermoplastic resin foam. 
     
     
         6 . The sound insulating material according to  claim 1 , wherein the inorganic compound is barium sulfate. 
     
     
         7 . The sound insulating material according to  claim 1 , wherein the resin magnification ratio of the thermoplastic resin constituting the thermoplastic resin foam is 300% or more.