Material for plastic lens, production process of the material, composition for plastic lens, plastic lens obtained by curing the composition, and production process of the plastic lens

Abstract

A material for plastic lenses, comprising at least one group represented by the following formula (1) as a terminal group and a group represented by the following formula (2) as a repeating unit. wherein each R 1 independently represents an allyl group or a methallyl group, A 1 and A 2 each independently represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride, and each X independently represents an organic residue derived from a polyhydric alcohol having from 2 to 3 hydroxyl groups and containing an alicyclic structure within the molecule, provided that by the ester bonding, X can have a branched structure having a group of formula (1) as a terminal group and a group of formula (2) as a repeating unit.

1 . A material for plastic lenses, comprising at least one group represented by the following formula (1) as a terminal group and a group represented by the following formula (2) as a repeating unit.  
       
         
           
           
               
               
           
         
       
       wherein each R 1  independently represents an allyl group or a methallyl group and each A 1  independently represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride.  
       
         
           
           
               
               
           
         
       
       wherein each A 2  independently represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride and each X independently represents an organic residue derived from a polyhydric alcohol having from 2 to 3 hydroxyl groups and containing an alicyclic structure within the molecule, provided that by the ester bonding, X can have a branched structure having a group of formula (1) as a terminal group and a group of formula (2) as a repeating unit.  
     
     
         2 . The material as claimed in  claim 1 , wherein the polyhydric alcohol is at least one selected from the compounds represented by the following structural formulae (7) to (13) and the following formula (14).  
       
         
           
           
               
               
           
         
       
       wherein each R 2  independently represents at least one selected from the organic groups represented by the following structural formulae (15) to (17), each R 3  independently represents at least one selected from the following structural formulae (18) to (20), a and b each independently represents 0 or an integer of 1 to 10, and Y represents any one selected from the organic groups represented by the following structural formulae (21) and (22)).  
       
         
           
           
               
               
           
         
       
     
     
         3 . A process for producing a material as set forth in  claim 1  or  2 , comprising a step of transesterifying at least one selected from the compounds represented by the following formula (3) with the polyhydric alcohol described in  claim 1  or  2  in the presence of a catalyst to obtain a plastic lens material:  
       
         
           
           
               
               
           
         
       
       wherein A represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride, and R 4  and R 5  each independently represents an allyl group or a methallyl group.  
     
     
         4 . The process as claimed in  claim 3 , wherein the catalyst is at least one member selected from the group consisting of tetraisopropoxy titanium, tetrabutoxy titanium, dibutyltin oxide, dioctyltin oxide, hafnium acetylacetonate and zirconium acetylacetonate.  
     
     
         5 . A composition for plastic lenses, comprising at least one plastic lens material as set forth in  claim 1  or  2 .  
     
     
         6 . A composition for plastic lenses, comprising from 0.1 to 10 parts by mass of at least one radical polymerization initiator per 100 parts by mass of a composition for plastic lenses as set forth in  claim 5 .  
     
     
         7 . The composition for plastic lenses as claimed in  claim 6 , wherein the at least one radical polymerization initiator contains diisopropylperoxy dicarbonate.  
     
     
         8 . The composition for plastic lenses as claimed in any one of  claims 5  to  7 , which has a viscosity at 25° C. of 1,000 mPa.s or less.  
     
     
         9 . A plastic lens obtained by curing a composition for plastic lenses as set forth in any one of  claims 5  to  8 .  
     
     
         10 . The plastic lens as claimed in  claim 9 , wherein a curing shrinkage in percentage at 23° C. is 10.0% or less.  
     
     
         11 . A process for producing a plastic lens as set forth in  claim 9  or  10 , which comprises curing a plastic lens composition as set forth in  claim 5  or  6 .  
     
     
         12 . The process as claimed in  claim 11 , wherein the plastic lens composition is cast polymerized at a temperature of 30 to 120° C. for 0.5 to 100 hours.