Damping material resin compositions, damping materials, restraining-type damping members, and use thereof

Abstract

An object of the invention is to provide a damping material resin composition which is great in loss tangent, exhibits outstanding damping properties and enables a damping material to retain its own shape. The invention provides a damping material resin composition comprising 100 parts by weight of a thermoplastic resin having a chlorine content of 20 to 70 wt. % and a weight average molecular weight of at least 400,000, and 100 to 1000 parts by weight of a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and 12 to 50 carbon atoms. (Preferably, the chlorinated paraffin contains 10 to 70 wt. % of a chlorinated paraffin having a chlorine content of at least 70 wt. %.)

1 . A damping material resin composition comprising 100 parts by weight of a thermoplastic resin having a chlorine content of 20 to 70 wt. % and a weight average molecular weight of at least 400,000, and 100 to 1000 parts by weight of a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and 12 to 50 carbon atoms.  
   
   
       2 . A damping material resin composition comprising 100 parts by weight of a thermoplastic resin having a chlorine content of 20 to 70 wt. %, 200 to 1000 parts by weight of a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and a number average carbon atom number of 12 to 50, and 300 to 1000 parts by weight of an inorganic filler.  
   
   
       3 . A damping material resin composition comprising a thermoplastic resin having a chlorine content of 20 to 70 wt. % and a degree of crystallinity of at least 5 J/g as measured by DSC, and a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and 12 to 50 carbon atoms.  
   
   
       4 . A damping material resin composition according to any one of  claims 1  to  3  wherein the chlorinated paraffin contains 10 to 70 wt. % of a chlorinated paraffin having a chlorine content of at least 70 wt. %.  
   
   
       5 . A damping material comprising a damping material resin composition according to any one of  claims 1  to  3 .  
   
   
       6 . A damping laminate comprising a damping material according to  claim 5 , and a restraining member laminated to one surface of the damping material.  
   
   
       7 . A damping member of the restraining type comprising a damping material made from a damping material resin composition according to any one of  claims 1  to  3 , a restraining member laminated to one surface of the damping material, and an adhesive resin layer laminated to the other surface of the damping material.  
   
   
       8 . A damping member of the restraining type according to  claim 7  wherein the difference between the glass transition temperature (Tg) of the damping resin layer and the Tg of the adhesive resin layer is at least 10° C.  
   
   
       9 . A damping member of the restraining type according to  claim 7  wherein a plasticizer migration preventing film is interposed between the damping resin layer and the adhesive resin layer so as to separate these layers, and the difference between the SP value of the film and the SP value of all components having a melting point of up to 80° C. and included among the components of the damping resin layer and the adhesive resin layer is at least 1.  
   
   
       10 . A damping member of the restraining type according to  claim 7  wherein the restraining layer is coated with a primer at least over a surface thereof adjacent to the restraining resin layer.  
   
   
       11 . A damping structure wherein a restraining-type damping member according to  claim 10  is affixed to a rough surface of a vibrating body.  
   
   
       12 . A tone improving structure for acoustic systems wherein a secondary sound deadening sheet comprising a damping material made from a damping material resin composition according to any one of  claims 1  to  3 , and a restraining member laminated to one surface of the damping material is affixed to at least one portion of a peripheral device of the acoustic system with the damping material.  
   
   
       13 . An acoustic system tone improving structure according to  claim 12  wherein the damping material is affixed to the peripheral device of the acoustic system with a double-faced adhesive tape, with a plasticizer migration preventing film interposed between the damping material and the adhesive tape.  
   
   
       14 . An acoustic system tone improving structure according to  claim 12  wherein the damping material comprises a damping material resin composition at least 2.5 in the peak value of loss tangent (tan δ), and the restraining member is at least 1 GPa in modulus of longitudinal elasticity.