Adhesive film, adhesive layer-equipped transparent plate and display device

Abstract

To provide an adhesive film by which air bubbles formed at a bonding interface when the adhesive film is used for bonding, readily disappear under normal temperature and normal pressure. One embodiment of the adhesive film of the present invention is characterized by having at least one adhesive layer, wherein the adhesive layer satisfies the following requirements (a) to (c). (a) A diffusion coefficient of nitrogen gas is at least 1.5×10 −6 cm 2 /sec, (b) A shear modulus G′ (1 Hz) is from 5×10 2 to 1.0×10 5 Pa, at a measurement temperature of 25° C. and a frequency of 1 Hz, and (C) The adhesive layer has an absorption peak at from 800 to 820 cm −1 and no absorption peak at from 1,000 to 1,020 cm −1 , in an infrared absorption spectrum.

1 . An adhesive film comprising at least one adhesive layer formed by curing a resin composition containing at least one polymer A1 having a curable group and a number average molecular weight of from 1,000 to 100,000, wherein the adhesive layer satisfies the following requirements (a) to (c):
 (a) a diffusion coefficient of nitrogen gas is at least 1.5×10 −6  cm 2 /sec,   (b) a shear modulus G′ (1 Hz) is from 5×10 2  to 1.0×10 5  Pa, at a measurement temperature of 25° C. and a frequency of 1 Hz, and   (c) the adhesive layer has an absorption peak at from 800 to 820 cm −1  and no absorption peak at from 1,000 to 1,020 cm −1 , in an infrared absorption spectrum.   
     
     
         2 . The adhesive film according to  claim 1 , wherein the adhesive layer has a glass transition temperature of at most −65° C. 
     
     
         3 . The adhesive film according to  claim 1 , wherein the adhesive layer has a tan δ of from 0.01 to 1.4 at a measurement temperature of 25° C. and a frequency of 1 Hz. 
     
     
         4 . The adhesive film according to  claim 1 , wherein the resin composition further contains a non-curable component. 
     
     
         5 . The adhesive film according to  claim 4 , wherein the non-curable component contains a hydroxy group. 
     
     
         6 . The adhesive film according to  claim 1 , wherein the diffusion coefficient of nitrogen gas in the adhesive layer is at most 3.0×10 −6  cm 2 /sec. 
     
     
         7 . An adhesive layer-equipped transparent plate comprising a transparent plate and at least one adhesive layer formed by curing a resin composition containing at least one polymer A1 having a curable group and a number average molecular weight of from 1,000 to 100,000, wherein the adhesive layer satisfies the following requirements (a) to (c):
 (a) a diffusion coefficient of nitrogen gas is at least 1.5×10 −6  cm 2 /sec,   (b) a shear modulus G′ (1 Hz) is from 5×10 2  to 1.0×10 5  Pa, at a measurement temperature of 25° C. and a frequency of 1 Hz, and   (c) the adhesive layer has an absorption peak at from 800 to 820 cm −1  and no absorption peak at from 1,000 to 1,020 cm −1 , in an infrared absorption spectrum.   
     
     
         8 . The adhesive layer-equipped transparent plate according to  claim 7 , wherein the adhesive layer has a glass transition temperature of at most −65° C. 
     
     
         9 . The adhesive layer-equipped transparent plate according to  claim 7 , wherein the adhesive layer has a tan δ of from 0.1 to 1.4, at a measurement temperature of 25° C. and a frequency of 1 Hz. 
     
     
         10 . The adhesive layer-equipped transparent plate according to Clair 7, wherein the resin composition further contains a non-curable component. 
     
     
         11 . The adhesive layer-equipped transparent plate according to  claim 10 , wherein the non-curable component contains a hydroxy group. 
     
     
         12 . The adhesive layer-equipped transparent plate according to  claim 7 , wherein the diffusion coefficient of nitrogen gas in the adhesive layer is at most 3.0×10 −6  cm 2 /sec. 
     
     
         13 . The adhesive layer-equipped transparent plate according to  claim 7 , wherein the transparent plate is a protective plate for a display device. 
     
     
         14 . A display device having a transparent plate and a display panel laminated via the adhesive film as defined in  claim 1 .