Pressure-sensitive adhesion sheets for silicone oxide-containing material

Abstract

The present invention provides a pressure-sensitive adhesion sheet being excellent in moisture and heat resistance and having a high adhesion to inorganic materials such as glass and tile, particularly a high adhesion even under high temperature and high humidity conditions, without using a silane coupling agent. The pressure-sensitive adhesion sheet for a silicone oxide-containing material comprises a base material having formed on at least one surface thereof a layer composed of an acrylic pressure-sensitive adhesive, wherein the base material is selected from a foamed base material having a water absorption rate less than 15% by weight after having been immersed in warm water having a temperature of 40° C. for 24 hours and a plastic film having a water vapor permeability of 500 g or less/m 2 /24 hours, and the acrylic pressure-sensitive adhesive to be used in combination with the base material selected is specified.

What is claimed is:  
     
         1 . A pressure-sensitive adhesion sheet [for a silicone oxide containing material], which comprises a foamed base material having formed on at least one surface thereof a layer composed of an acrylic pressure-sensitive adhesive comprising a copolymer comprising: 
 (a) 60 to 94% by weight of an acrylic monomer represented by formula (1a): CH 2 ═C(R 1 )COOR 2  wherein R 1  is a hydrogen atom or a methyl group; and R 2  is an alkyl group having 4 to 14 carbon atoms,    (b) 5 to 40% by weight of a (meth)acrylamide represented by formula (2a): CH 2 ═C(R 3 )CONR 4 R 5  wherein R 3  is a hydrogen atom or a methyl group; R 4  is a hydrogen atom or an alkyl group; and R 5  is an alkyl group or an organic group which is bonded to R 4  to form a hetero ring together with a N atom, and    (c) 1 to 10% by weight of a monomer having an acidic group, each based on the total content of components a), b) and c),    wherein the foamed base material has a water absorption rate less than 15% by weight after having been immersed in warm water having a temperature of 40° C. for 24 hours.    
     
     
         2 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 1 , wherein the (meth)acrylamide represented by formula (2a) is selected from the group consisting of N-methylacrylamide, N,N-diamethylacrylamide, N-isopropylacrylamide, N,N-diethyl (meth)acrylamide, N,N-dibutyl (meth)acrylamide, N-(meth)acryloylmorpholine, N-(meth)acryloylpyrrolidone, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, and N-(meth)acryloyl-4-peperidone.  
     
     
         3 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 1 , wherein the monomer having an acidic group is a carboxyl-containing monomer or a phosphoric group-containing monomer.  
     
     
         4 . A pressure-sensitive adhesion sheet [for a silicone oxide containing material], which comprises a plastic film formed on at least one surface thereof a layer composed of an acrylic pressure-sensitive adhesive comprising a copolymer comprising: 
 (a) 60 to 95% by weight of an acrylic monomer represented by formula (1b): CH 2 ═C(R 1 )COOR 2  wherein R 1  is a hydrogen atom or a methyl group; and R 2  is an alkyl group having 4 to 12 carbon atoms,    (b) 5 to 40% by weight of a N,N-disubstituted (meth)acrylamide represented by formula (2b): CH 2 ═C(R 3 )CONR 4 R 5  wherein R 3  is a hydrogen atom or a methyl group; R 4  and R 5  are alkyl groups or organic groups which are bonded to each other to form a hetero ring together with a N atom, and    (c) 0 to 10% by weight of a monomer having an acidic group, each based on the total content of components a), b) and c),    wherein the plastic film has a water vapor permeability of 500 g or less/m 2 /24 hours.    
     
     
         5 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 4 , wherein a gel percentage of the copolymer is 50 to 95% by weight.  
     
     
         6 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 4 , wherein the (meth)acrylamide represented by formula (1b) is selected from the group consisting of butyl (meth)acrylate, isobutyl (meth)acrylate, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, and isodecyl (meth) acrylate.  
     
     
         7 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 4 , wherein the (meth)acrylamide represented by formula (2b) is selected from the group consisting of N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N,N-dibutyl (meth)acrylamide, N-(meth)acryloylmorpholine, N-(meth)acryloylpyrrolidone, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine and N-(meth)acryloyl-4-peperidone.  
     
     
         8 . The pressure-sensitive adhesion sheet [for a silicone oxide containing material] of  claim 4 , wherein the monomer having an acidic group is a carboxyl-containing monomer or a phosphoric group-containing monomer.  
     
     
         9 . A pressure-sensitive adhesion sheet comprising: 
 (a) a base selected from a foamed material having a water absorption rate of less than 15% by weight after having been immersed in warm water having a temperature of 40° C. for 24 hours or a plastic film having a water vapor permeability of 500 g or less/m 2 /24 hours; and    (b) a pressure sensitive acrylic copolymer adhesive coated on said base; wherein when said base is the foamed material, the copolymer comprises: 
 (1) about 60 to 94% by weight of an acrylic monomer represented by formula (1a): CH 2 ═C(R 1 )COOR 2  wherein R 1  is a hydrogen atom or a methyl group; and R 2  is an alkyl group having 4 to 14 carbon atoms;  
 (2) about 5 to 40% by weight of a (meth)acrylamide represented by formula (2a): CH 2 ═C(R 3 )CONR 4 R 5  wherein R 3  is a hydrogen atom or a methyl group; R 4  is a hydrogen atom or an alkyl group; and R 5  is an alkyl group or an organic group which is bonded to R 4  to form a hetero ring together with a N atom; and  
 (3) about 1 to 10% by weight of a monomer having an acidic group each based on the total content of components (1), (2) and (3), and  
   when said base is the plastic film, the copolymer comprises: 
 (1) about 60 to 95% by weight of an acrylic monomer represented by formula (1b): CH 2 ═C(R 1 )COOR 2  wherein R 1  is a hydrogen atom or a methyl group and R 2  is an alkyl group having 4 to 12 carbon atoms;  
 (2) about 5 to 40% by weight of a N,N-disubstituted (meth)acrylamide represented by formula (2b): CH 2 ═C(R 3 )CONR 4 R 5  wherein R 3  is a hydrogen atom or a methyl group; R 4  and R 5  are alky groups or organic groups which are bonded to each other to form a hetero ring together with a N atom; and  
 (3) about 0 to 10% by weight of a monomer having an acidic group, each based on the total content of components (1), (2), and (3).  
   
     
     
         10 . A glass or tile article having the pressure sensitive adhesion sheet of  claim 9  attached thereto.  
     
     
         11 . An article according to  claim 10  comprising a window.  
     
     
         12 . An article according to  claim 10  comprising a container.  
     
     
         13 . An article according to  claim 10  comprising a picture ray tube.  
     
     
         14 . An article according to  claim 10  comprising a liquid crystal display panel.  
     
     
         15 . An article according to  claim 9  wherein the base has a design therein.  
     
     
         16 . The pressure-sensitive adhesion sheet of  claim 3  wherein the monomer having an acidic group is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, 2-hydroxyethylacryloyl phosphate and 2-hydroxypropylacryloyl phosphate.  
     
     
         17 . The pressure-sensitive adhesion sheet of  claim 8  wherein the monomer having an acidic  
     
     
         18 . The pressure-sensitive adhesion sheet of  claim 9  wherein the foam base material is a material selected from the group consisting of butyl rubber, chloroprene rubber, urethane, polyethylene, acryl, epichlorohydrin rubber, and silicone rubber.  
     
     
         19 . The pressure-sensitive adhesion sheet of  claim 9  wherein the plastic film is a material selected from the group consisting of polyester, polycarbonate, and polypropylene.