Intermediate film for laminated glass and laminated glass

Abstract

The present invention provides an interlayer film for laminated glass having a monolayer structure comprising only a first layer or a multilayer structure comprising at least two layers including a first layer and a second layer stacked at least on one face of the first layer, wherein the first layer contains a thermoplastic resin and a first plasticizer represented by the formula (1): and the interlayer film has a monolayer structure or a multilayer structure including at least two layers and includes the first layer further containing a second plasticizer that is a diester compound, or the interlayer film has a multilayer structure including at least two layers and includes the second layer containing a plasticizer and a polyvinyl acetal resin with a hydroxyl content of 25 to 40 mol %.

1 . An interlayer film for laminated glass having
 a monolayer structure comprising only a first layer,   wherein the first layer contains a polyvinyl acetal resin that is a thermoplastic resin and a first plasticizer represented by the formula (1):   
       
         
           
           
               
               
           
         
       
       in which R1 and R2 each represent an organic group containing at least one ether bond and n represents an integer of 2 to 8, the first layer further contains a second plasticizer that is a diester compound, and
 the polyvinyl acetal resin in the first layer has an acetylation degree of at most 30 mol %. 
 
     
     
         2 . The interlayer film for laminated glass according to  claim 1 ,
 wherein R1 and R2 in the formula (1) each represent a group containing a carbon atom and an oxygen atom in a total number of at most 12.   
     
     
         3 . The interlayer film for laminated glass according to  claim 1 ,
 wherein R1 and R2 in the formula (1) each have at least one ether bond structural unit represented by the formula (11):   
       
         
           
           
               
               
           
         
       
       or the formula (12): 
       
         
           
           
               
               
           
         
       
     
     
         4 . The interlayer film for laminated glass according to  claim 1 ,
 wherein, in the formula (1), R1 is a group represented by the formula (21):   
       
         
           
           
               
               
           
         
       
       in which R21 represents an alkyl group having 1 to 10 carbon atom(s), R22 represents an alkylene group having 1 to 10 carbon atom(s), and m1 represents an integer of 1 to 5, and
 R2 is a group represented by the formula (26): 
 
       
         
           
           
               
               
           
         
       
       in which R26 represents an alkyl group having 1 to 10 carbon atom(s), R27 represents an alkylene group having 1 to 10 carbon atom(s), and m2 represents an integer of 1 to 5. 
     
     
         5 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the second plasticizer is represented by the formula (51):   
       
         
           
           
               
               
           
         
       
       in which R51 and R52 each represent an organic group having 5 to 10 carbon atoms, R53 represents an ethylene group, isopropylene group, or n-propylene group, and p represents an integer of 3 to 10. 
     
     
         6 . The interlayer film for laminated glass according to  claim 1 ,
 Wherein the first layer contains the first plasticizer and the second plasticizer at a weight ratio of 1:9 to 8.5:1.5.   
     
     
         7 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin in the first layer has a hydroxyl content of at most 25 mol %.   
     
     
         8 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin in the first layer is obtained by acetalization of a polyvinyl alcohol having an average degree of polymerization of 2700 to 5000.   
     
     
         9 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin in the first layer contains a high molecular weight component having an absolute molecular weight of at least 1 million and the high molecular weight component accounts for at least 7.4% of the polyvinyl acetal resin in the first layer, or   the polyvinyl acetal resin in the first layer contains a high molecular weight component having a polystyrene-equivalent molecular weight of at least 1 million and the high molecular weight component accounts for at least 9% of the polyvinyl acetal resin in the first layer.   
     
     
         10 . The interlayer film for laminated glass according to  claim 1 ,
 wherein, when the first layer is used as a resin film with a glass transition temperature of Tg (° C.) for measurement of the viscoelasticity, an elasticity G′(Tg+80) at (Tg+80) ° C. and an elasticity G′(Tg+30) at (Tg+30) ° C. have a ratio (G′(Tg+80)/G′ (Tg+30)) of at least 0.65.   
     
     
         11 . The interlayer film for laminated glass according to  claim 1 ,
 wherein when the viscoelasticity of a resin film containing 100 parts by weight of the polyvinyl acetal resin in the first layer and 60 parts by weight of triethylene glycol di-2-ethylhexanoate (3GO) as a plasticizer and having a glass transition temperature of Tg (° C.) for measurement of the viscoelasticity, an elasticity G′(Tg+80) at (Tg+80)° C. and an elasticity G′(Tg+30) at (Tg+30)° C. have a ratio (G′(Tg+80)/G′ (Tg+30)) of at least 0.65.   
     
     
         12 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin in the first layer is obtained by acetalization of a polyvinyl alcohol resin having an average degree of polymerization of more than 3000.   
     
     
         13 . The interlayer film for laminated glass according to  claim 1 ,
 wherein the polyvinyl acetal resin in the first layer has an acetylation degree of at least 8 mol %, or an acetylation degree of less than 8 mol % and an acetalization degree of at least 68 mol %.   
     
     
         14 . The interlayer film for laminated glass according to  claim 13 ,
 wherein the polyvinyl acetal resin in the first layer has an acetylation degree of at least 8 mol %.   
     
     
         15 . The interlayer film for laminated glass according to  claim 13 ,
 wherein the polyvinyl acetal resin in the first layer has an acetylation degree of less than 8 mol % and an acetalization degree of at least 68 mol %.   
     
     
         16 . A laminated glass comprising:
 a first component for laminated glass;   a second component for laminated glass;   an interlayer film between the first component for laminated glass and the second component for laminated glass,   wherein the interlayer film includes the interlayer film for laminated glass according to  claim 1 .