Moisture curable composition

Abstract

A moisture curable composition excellent in transparency, operating efficiency and storage stability, and is suitable for use as an adhesive and a sealing material is provided. The moisture curable composition produced by blending 100 parts by weight of a mixture (A) and 2 parts by weight to 300 parts by weight of amorphous powder (B). The mixture (A) comprises (1) a copolymer having reactive silicon groups which can be cross-linked by hydrolysis, whose molecular chain substantially consists of (i) alkylacrylate and/or alkylmethacrylate monomeric units having an alkyl group with 1 to 8 carbon atoms, and (ii) alkylacrylate and/or alkylmethacrylate monomeric units having an alkyl group with 10 or more carbon atoms, and (2) a polymer substantially consisting of oxyalkylene including reactive silicon groups which can be cross-linked by hydrolysis. The amorphous powder (B) has a grain diameter ranging from 0.01 μm to 300 μm.

1. A moisture curable composition produced by blending:
 100 parts by weight of a mixture (A) comprising: 
 (1) a copolymer having reactive silicon groups which can be cross-linked by hydrolysis, whose molecular chain has: 
 (i) alkylacrylate and/or alkylmethacrylate monomeric units having an alkyl group with 1 to 8 carbon atoms; and  
 (ii) alkylacrylate and/or alkylmethacylate monomeric units having an alkyl group with 10 or more carbon atoms; and  
 
 (2) an oxyalkylene polymer including reactive silicon groups which can be cross-linked by hydrolysis; and  
 
 2 parts by weight to 300 parts by weight of polymethyl methacrylate powder (B) having a grain diameter ranging from 0.01 μm to 300 μm, wherein said mixture ( A )  has a first refractive index, and said polymethyl methacrylate powder  ( B )  has a second refractive index, and wherein a difference of the first refractive index and second refractive index is  0 . 1  or less .  
 
     
     
       2. A moisture curable composition according to  claim 1 , wherein said mixture (A) has a refractive index mated with a refractive index of said polymethyl methacrylate powder (B). 
     
     
       3. A moisture curable composition according to  claim 1  or  2 , wherein said mixture (A) includes at least one polymer including silyl groups. 
     
     
       4. A moisture curable composition according to  claim 3 , wherein said polymer is an acrylic polymer including silyl groups. 
     
     
       5. A moisture curable composition produced by blending:
     100  parts by weight of a mixture  ( A )  comprising:    (   1   )  a copolymer having reactive silicon groups which can be cross - linked by hydrolysis, whose molecular chain has:  
 ( i )  alkylacrylate and/or alkylmethacrylate monomeric units having an alkyl group with  1  to  8  carbon atoms; and    
 ( ii )  alkylacrylate and/or alkylmethacrylate monomeric units having an alkyl group with  10  or more carbon atoms; and    
   (   2   )  an oxyalkylene polymer including reactive silicon groups which can be cross - linked by hydrolysis; and            2  parts by weight to  300  parts by weight of polymethyl methacrylate powder  ( B )  having a grain diameter ranging from  0 . 01  μm to  300  μm,        further comprising:      amorphous silica having a grain diameter ranging from  0 . 01  μm to  300  μm, wherein said mixture  ( A )  has a first refractive index, and a mixture of said polymethyl methacrylate powder  ( B )  and said amorphous silica has a second refractive index, and wherein a difference of the first and second refractive indexes is  0 . 1  or less.       
     
     
       6. The moisture curable composition according to  claim 5 , wherein said mixture ( A )  includes at least one polymer including silyl groups.   
     
     
       7. The moisture curable composition according to  claim 6 , wherein said polymer is an acrylic polymer including silyl groups.