Resin composition, cured product and optical parts

Abstract

It is provided for a resin composition including (A) at least one polyamic acid having the structure represented by the following formula (1): wherein R 1 is independently an alkyl group having 1 to 3 carbon atoms or a cyano group; a is independently an integer of 0 to 4; R is a tetravalent organic group; n is an integer of 1 to 4; and m is an integer of 1 to 100,000, and (E) an organic solvent.

1 . A resin composition comprising:
 (A) at least one polyamic acid having the structure represented by the following general formula (1):   
     
       
         
         
             
             
         
       
       wherein R 1  is independently an alkyl group having 1 to 3 carbon atoms or a cyano group; a is independently an integer of 0 to 4; R is selected from the group consisting of a tetravalent alicyclic groups and tetravalent aliphatic groups; n is an integer of 1 to 4; and m is an integer of 1 to 100,000, and 
       (E) an organic solvent. 
     
   
   
       2 . The resin composition according to  claim 1  wherein R is selected from the group consisting of tetravalent alicyclic groups and tetravalent aliphatic groups. 
   
   
       3 . (canceled) 
   
   
       4 . The resin composition according to any one of  claims 1  to  2 , wherein the composition further comprises (B) particles which are formed mainly of an oxide of an element belonging to Group IV in the periodic table and have a primary particle size within a range of 1 to 100 nm. 
   
   
       5 . The resin composition according to  claim 4 , wherein the particles of the component (B) are formed of titanium oxide or zirconium oxide. 
   
   
       6 . The resin composition according to  claim 4 , wherein the particles of the component (B) are formed of titanium oxide coated with silicon oxide. 
   
   
       7 . The resin composition according to any one of  claims 1  to  6 , wherein the composition further comprises (C) a surfactant. 
   
   
       8 . The resin composition according to any one of  claims 1  to  7 , wherein the composition further comprises (D) an imidization catalyst. 
   
   
       9 . The resin composition according to  claim 8 , wherein the (D) imidization catalyst is a photo acid generator or a photo base generator. 
   
   
       10 . The resin composition according to any one of  claims 1  to  9 , wherein the composition further comprises a polyamic acid other than the polyamic acid having the structure represented by the general formula (1). 
   
   
       11 . A cured film obtainable by heating the resin composition according to any one of  claims 1  to  10 . 
   
   
       12 . The cured film according to  claim 11 , wherein the refractive index measured at a temperature of 25° C. at a wave length of 633 nm is 1.60 or higher. 
   
   
       13 . A cured film comprising an imidization polymer having the structure represented by the following general formula (2): 
     
       
         
         
             
             
         
       
       wherein R 1  is independently an alkyl group having 1 to 3 carbon atoms or a cyano group; a is independently an integer of 0 to 4; R is selected from the group consisting of a tetravalent alicyclic groups and tetravalent aliphatic groups; n is an integer of 1 to 4; and m is an integer of 1 to 100,000. 
     
   
   
       14 . An optical part made of the cured film according to any one of  claims 11  to  13 . 
   
   
       15 . The optical part according to  claim 14 , for a condensing material of a solid-state image sensing device. 
   
   
       16 . The optical part according to  claim 14 , for a condensing material of a recording disk.