Curable composition and compatibilizing agent

Abstract

It is an object of the present invention to provide a curable which has good storage stability and can give cured products retaining the high elongation characteristic originating from the polyether polymer and showing a high gel fraction and good weatherability. Thus, the present invention provides a durable composition which comprises the following two components: a polyether polymer having at least one crosslinkable functional group and a vinyl polymer which is compatible with said polyether polymer having at least one crosslinkable functional group at a polymer terminus. Further, the present invention provides a curable composition which comprises the following three components: a polyether polymer having at least one crosslinkable functional group, a vinyl polymer incompatible with said polyether polymer and having at least one crosslinkable function group, and a compatibilizing agent capable of compatibilizing said polyether polymer and said vinyl polymer with each other when added to a mixture thereof.

1 . A curable composition
 which comprises the following three components:   (I) a polyether polymer having at least one crosslinkable functional group,   (II) a vinyl polymer incompatible with said polyether polymer and having at least one crosslinkable function group, and   (IV) at least one compatibilizing agent capable of compatibilizing said polyether polymer and said vinyl polymer with each other when added to a mixture thereof, said compatibilizing agent being selected from the group consisting of nonpolymer organic compounds, polymers obtain able by polymerizing a monomer or monomers other than vinyl monomers, and polymers obtain able by polymerizing a single vinyl monomer.   
     
     
         2 . The curable composition according to  1  wherein the compatibilizing agent (IV) is a polyoxyalkylene having a molecular weight of not more than 3,000. 
     
     
         3 . The curable composition according to  claim 2 , wherein the compatibilizing agent (IV) is polypropylene oxide having a molecular weight of not more than 3,000. 
     
     
         4 . The curable composition according to  4 , in which the cured product derived there from by curing without using any filler and having a thickness of not more than 100 μm shows a level of weatherability which is not shorter than 20 hours in sunshine weathermeter testing. 
     
     
         5 . A compatibilizing agent obtain able by copolymerization of a plurality of vinyl monomers and capable of compatibilizing the two components:
 (I) a polyether polymer having at least one crosslinkable functional group, and   (II) a vinyl polymer incompatible with said polyether polymer and having at least one crosslinkable function group,   with each other, when added to a mixture thereof.   
     
     
         6 . The compatibilizing agent according to  claim 5 , which is obtain able by the copolymerization of at least one vinyl monomer selected from among the monomers usable in polymerizing the vinyl polymer (II), with another vinyl monomer. 
     
     
         7 . The compatibilizing agent according to  claim 6 , wherein the other vinyl monomer is a vinyl monomer having a polyether structure. 
     
     
         8 . The compatibilizing agent according to  claim 7 , wherein the mole ratio between the at least one monomer selected from among the monomers usable in polymerizing the vinyl polymer (II) and the vinyl monomer having a polyether structure is within the range of 1:20 to 20:1. 
     
     
         9 . The compatibilizing agent according to  5 , which has a number average molecular weight of 500 to 50,000 as determined by gel permeation chromatography. 
     
     
         10 . The compatibilizing agent according to  7 , wherein the polyether structure is essentially polypropylene oxide. 
     
     
         11 . The compatibilizing agent according to  5  wherein the vinyl monomer is a (meth)acrylic monomer. 
     
     
         12 . The compatibilizing agent according to  7 , which is produced by a living radical polymerization technique. 
     
     
         13 . The compatibilizing agent according to  claim 12 , wherein the living radical polymerization technique consists in atom transfer radical polymerization. 
     
     
         14 . The compatibilizing agent according to  6 , which has a number average molecular weight of 500 to 50,000 as determined by gel permeation chromatography. 
     
     
         15 . The compatibilizing agent according to  7 , which has a number average molecular weight of 500 to 50,000 as determined by gel permeation chromatography. 
     
     
         16 . The compatibilizing agent according to  8 , which has a number average molecular weight of 500 to 50,000 as determined by gel permeation chromatography. 
     
     
         17 . The compatibilizing agent according to  8 , wherein the polyether structure is essentially polypropylene oxide. 
     
     
         18 . The compatibilizing agent according to  9 , wherein the polyether structure is essentially polypropylene oxide. 
     
     
         19 . The compatibilizing agent according to  6  wherein the vinyl monomer is a (meth)acrylic monomer. 
     
     
         20 . The compatibilizing agent according to  7  wherein the vinyl monomer is a (meth)acrylic monomer.