Radiation-curable metal particles and curable resin compositions comprising these particles

Abstract

To provide a liquid curable resin composition which can produce transparent cured products with a high refractive index, high hardness, and superior abrasion resistance, and can be suitably used as a coating material. [Solution] A liquid curable resin composition comprising: (A) a poly-functional (meth)acrylic compound having at least three (meth)acryloyl groups in the molecule, (B) a reaction product obtained by the reaction of a compound having a polymerizable unsaturated group and alkoxysilyl group in the molecule and particles metal oxide, the metals being selected from the group consisting of zirconium, antimony, zinc, tin, cerium, and titanium, and (C) a radiation polymerization initiator.

1 . A radiation-curable metal particle comprising a radiation-curable group linked by a silyl group to a metal.  
     
     
         2 . The particle according to  claim 1 , wherein said metal is selected from the group consisting of zirconium, tatinium, antimony, zinc, tin, indium, cerium and aluminium.  
     
     
         3 . The particle according to any one of claims  1 - 2 , wherein the silyl group is a substituted silyl group which comprises an alkoxy group, a urethane group and/or a thiourethane group.  
     
     
         4 . The particle according to any one of claims  1 - 3 , wherein said particle is obtainable by reacting an organosilicon compound with a metal oxide.  
     
     
         5 . The particle according to any one of claims  1 - 4 , wherein the particle has a diameter of from 0.001 to 2 μm.  
     
     
         6 . A method for forming a radiation-curable metal particle according to any one of claims  1 - 5 , comprising reacting a metal oxide with an organosilicon compound.  
     
     
         7 . The method according to  claim 6 , wherein the metal oxide is reacted with the organosilicon compound in the presence of an acid or a base.  
     
     
         8 . A radiation-curable composition comprising: 
 (A) a (meth)acrylic compound;    (B) metal particles according to any one of claims  1 - 6 ; and    (C) a radiation polymerization photoinitiator.    
     
     
         9 . The composition according to  claim 8 , wherein said (meth)acrylic compound comprises at least three (meth)acryloyl groups.  
     
     
         10 . The composition according to any one of claims  8 - 9 , wherein an about 5 μm thick layer of the composition, after cure, has a light transmittance of at least 90% and a haze value after the Taber's abrasion test of less than 40%.  
     
     
         11 . A product formed from curing the composition according to any one of claims  8 - 10 , wherein said product has a refractive index of at least 1.55 and a light transmittance of at least 95%.  
     
     
         12 . The product according to  claim 11 , wherein said products is a coating.  
     
     
         13 . An anti-reflection article comprising the product according to any one of claims  11 - 12 .