Interlayer for laminated glass and laminated glass

Abstract

The present invention aims to provide an intermediate film for laminated glass which, in the case of being used for constituting a laminated glass, enables to improve the sound-insulating property of a laminated glass to be obtained; and a laminated glass. The intermediate film 1 for laminated glass of the present invention comprises a first layer 2 which contains a polyvinyl acetal resin and a plasticizer and the degree of acetylation of the polyvinyl acetal resin contained in the first layer 2 exceeds 30 mol %; and The laminated glass of the present invention comprises first and second components for laminated glass, and the intermediate film 1 for laminated glass sandwiched between the first and second components for laminated glass.

1 . An intermediate film for laminated glass with a single layer structure or a laminated structure of two or more layers, comprising:
 a first layer containing a polyvinyl acetal resin and a plasticizer,   wherein a degree of acetylation of the polyvinyl acetal resin contained in the first layer exceeds 30 mol %.   
     
     
         2 . The intermediate film for laminated glass with a laminated structure of two or more layers according to  claim 1 , further comprising
 a second layer disposed at the side of a first surface of the first layer.   
     
     
         3 . The intermediate film for laminated glass according to  claim 2 ,
 wherein the second layer contains a polyvinyl acetal resin, and   a degree of acetylation of the polyvinyl acetal resin contained in the second layer is lower than the degree of acetylation of the polyvinyl acetal resin contained in the first layer.   
     
     
         4 . The intermediate film for laminated glass according to  claim 3 ,
 wherein the degree of acetylation of the polyvinyl acetal resin contained in the second layer is 30 mol % or lower.   
     
     
         5 . The intermediate film for laminated glass according to  claim 2 ,
 wherein the second layer contains the polyvinyl acetal resin and a plasticizer, and   an amount of the plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the second layer is less than an amount of the plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the first layer.   
     
     
         6 . The intermediate film for laminated glass according to  claim 2 ,
 wherein the second layer is laminated on the first source of the first layer.   
     
     
         7 . The intermediate film for laminated glass with a laminated structure of two or more layers according to  claim 1 , further comprising
 a second layer which is laminated on a first surface of the first layer and which contains a polyvinyl acetal resin and a plasticizer,   wherein an amount of the plasticizer is 50 parts by weight or more for each 100 parts by weight of the polyvinyl acetal resin in the first layer,   a hydroxy group content in the polyvinyl acetal resin contained in the first layer is lower than a hydroxy group content in the polyvinyl acetal resin contained in the second layer,   the difference between the hydroxy group content in the polyvinyl acetal resin contained in the first layer and the hydroxy group content in the polyvinyl acetal resin contained in the second layer is 9.2 mol % or smaller.   
     
     
         8 . The intermediate film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin contained in the first layer contain a high-molecular-weight component with an absolute molecular weight of 1,000,000 or higher and a proportion of the high-molecular-weight component in the polyvinyl acetal resin contained in the first layer is 7.4% or higher, or   the polyvinyl acetal resin contained in the first layer contains a high-molecular-weight component with a molecular weight in terms of polystyrene of 1,000,000 or higher and a proportion of the high molecular-weight component in the polyvinyl acetal resin contained in the first layer is 9% or higher.   
     
     
         9 . The intermediate film for laminated glass according to  claim 1 ,
 wherein a ratio (G′(Tg+80)/G′(Tg+30)) of an elastic modulus G′(Tg+80) at (Tg+80)° C. to an elastic modulus G′(Tg+30) at (Tg+30) ° C. is 0.65 or higher, provided that the first layer is used as a resin film and a viscoelasticity of the resin film is measured, and that Tg(° C.) represents a glass transition temperature of the resin film.   
     
     
         10 . The intermediate film for laminated glass according to  claim 1 ,
 wherein a ratio (G′(Tg+80)/G′(Tg+30)) of an elastic modulus G′(Tg+80) at (Tg+80)° C. to an elastic modulus G′(Tg+30) at (Tg+30)° C. is 0.65 or higher, provided that a resin film containing 100 parts by weight of the polyvinyl acetal resin contained in the first layer and 60 parts by weight of triethylene glycol di-2-ethyl hexanoate (3GO) as a plasticizer is prepared and a viscoelasticity of the resin film is measured, and that Tg(° C.) represents a glass transition temperature of the resin film.   
     
     
         11 . The intermediate film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin contained in the first layer is obtained by acetalizing a polyvinyl alcohol resin having an average degree of polymerization exceeding 3,000.   
     
     
         12 . The intermediate film for laminated glass with a laminated structure of three or more layers according to  claim 1 , further comprising:
 a second layer disposed at the side of a first surface of the first layer; and   a third layer disposed at the side of a second surface that is opposite to the first surface of the first layer.   
     
     
         13 . The intermediate film for laminated glass according to  claim 12 ,
 wherein the third layer contains a polyvinyl acetal resin, and   a degree of acetylation of the polyvinyl acetal resin contained in the third layer is lower than a degree of acetylation of the polyvinyl acetal resin contained in the first layer.   
     
     
         14 . The intermediate film for laminated glass according to  claim 13 ,
 wherein the degree of acetylation of the polyvinyl acetal resin contained in the third layer is 30 mol % or lower.   
     
     
         15 . The intermediate film for laminated glass according to  claim 12 ,
 wherein the third layer contains a polyvinyl acetal resin and a plasticizer, and   an amount of the plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the third layer is lower than an amount of the plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the first layer.   
     
     
         16 . The intermediate film for laminated glass according to  claim 12 ,
 wherein the third layer is laminated on the second surface of the first layer.   
     
     
         17 . A laminated glass, comprising
 a first component for laminated glass;   a second component for laminated glass; and   an intermediate film sandwiched between the first component for laminated glass and the second component for laminated glass,   wherein the intermediate film is the intermediate film for laminated glass according to  claim 1 .