Polymer for optical film, and optical film including the same

Abstract

A composition for preparing an optical film, comprising a tetracarboxylic acid dianhydride represented by Chemical Formula 1, a first diamine represented by Chemical Formula 2, and a second diamine represented by Chemical Formula 3, wherein an amount of the second diamine represented by Chemical Formula 3 is equal to or less than 30 mol % based on the total amount of the first and second diamines: wherein, R 1 to R 5 , n1 to n3 are defined in the specification.

What is claimed is: 
     
         1 . A composition for preparing an optical film, comprising:
 a tetracarboxylic acid dianhydride represented by Chemical Formula 1,   a first diamine represented by Chemical Formula 2, and   a second diamine represented by Chemical Formula 3,   wherein an amount of the second diamine represented by Chemical Formula 3 is equal to or less than 30 mol % based on the total amount of the first and second diamines:   
       
         
           
           
               
               
           
         
         wherein in Chemical Formulae 1 to 3, 
         R 1  and R 2  are the same or different, and are each independently a substituted or unsubstituted C4 to C20 alicyclic organic group, or a substituted or unsubstituted C6 to C30 aromatic organic group, wherein the aromatic organic group comprises one aromatic ring, two or more aromatic rings fused together to provide a condensed ring system, or two or more moieties linked through a single bond or through a functional group selected from a fluorenylene group, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p — wherein 1≦p≦10, —(CF 2 ) p — wherein 1≦q≦10, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —C(═O)NH—, a substituted or unsubstituted C3 to C10 cycloalkylene group, and a substituted or unsubstituted C6 to C15 arylene group, 
         R 3  to R 5  are the same or different, and are each independently selected from a C1 to C20 alkyl group, a C6 to C20 aryl group, and a halogen, 
         n1 is an integer from 0 to 5, and 
         n2 and n3 are the same or different, and are each independently an integer from 0 to 4. 
       
     
     
         2 . The composition according to  claim 1 , wherein an amount of the second diamine represented by Chemical Formula 3 is equal to or less than about 25 mol % based on the total amount of the first and second diamines. 
     
     
         3 . The composition according to  claim 1 , wherein an amount of the second diamine represented by Chemical Formula 3 is equal to or less than about 10 mol % based on the total amount of the first and second diamines. 
     
     
         4 . The composition according to  claim 1 , wherein an amount of the second diamine represented by Chemical Formula 3 is from about 0.1 mol % to about 30 mol % based on the total amount of the first and second diamines. 
     
     
         5 . The composition according to  claim 1 , wherein an amount of the second diamine represented by Chemical Formula 3 is from about 0.5 mol % to about 25 mol % based on the total amount of the first and second diamines. 
     
     
         6 . The composition according to  claim 1 , wherein an amount of the second diamine represented by Chemical Formula 3 is from about 1.0 mol % to about 10 mol % based on the total amount of the first and second diamines. 
     
     
         7 . The composition according to  claim 1 , wherein the tetracarboxylic acid dianhydride represented by Chemical Formula 1 is one or more selected from 3,3′,4,4′-biphenyltetracarboxylic dianhydride, bicycle[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride, 4,4′-(hexafluoroisopropylidene)diphthalic anhydride, 4,4′-oxydiphthalic anhydride, pyromellitic dianhydride, and 4-(2,5-dioxotetrahydrofuran-3-yl)-1,2,3,4-tetrahydronaphthalene-1,2-dicarboxylic anhydride. 
     
     
         8 . The composition according to  claim 1 , wherein the first diamine represented by Chemical Formula 2 is one or more selected from the chemical formulae: 
       
         
           
           
               
               
           
         
         wherein in the chemical formulae, 
         R 32  to R 52  are the same or different and may each independently be hydrogen, a halogen, a nitro group, a substituted or unsubstituted C1 to C15 alkyl group, a substituted or unsubstituted C1 to C15 alkoxy group, a substituted or unsubstituted C1 to C15 fluoroalkyl group, a substituted or unsubstituted C3 to C15 cycloalkyl group, a substituted or unsubstituted C3 to C15 heterocycloalkyl group, a substituted or unsubstituted C3 to C15 cycloalkoxy group, a substituted or unsubstituted C6 to C15 aryl group, a substituted or unsubstituted C6 to C15 aryloxy group, or a substituted or unsubstituted C2 to C15 heteroaryl group, 
         X 2  to X 12  are the same or different and may each independently be a single bond, a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C10 cycloalkylene group, a substituted or unsubstituted C5 to C40 heterocycloalkylene group, a substituted or unsubstituted C6 to C15 arylene group, a substituted or unsubstituted C3 to C40 heteroarylene group, —SO 2 —, —O—, —C(═O)—, or a combination thereof, 
         n35 to n37, and n40 to n49, are integers ranging from 0 to 4, and 
         n38 and n39 are integers ranging from 0 to 3. 
       
     
     
         9 . The composition according to  claim 1 , wherein the first diamine represented by Chemical Formula 2 is one or more selected from compounds represented by chemical formulae: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         10 . The composition according to  claim 1 , wherein one or more of R 3  to R 5  are the same or different, and are each independently a C1 to C4 alkyl group, a phenyl group, or a halogen. 
     
     
         11 . The composition according to  claim 1 , wherein the tetracarboxylic acid dianhydride represented by Chemical Formula 1 is 3,3′,4,4′-biphenyl tetracarboxylic dianhydride, pyromellitic dianhydride, or a combination thereof. 
     
     
         12 . The composition according to  claim 1 , wherein the second diamine represented by Chemical Formula 3 is 1,1′-bis(4-aminophenyl)cyclohexane. 
     
     
         13 . A polymer represented by Chemical Formula 4, Chemical Formula 5, or a combination thereof: 
       
         
           
           
               
               
           
         
         wherein in Chemical Formula 4 and Chemical Formula 5, 
         R 1  and R 2  are the same or different, and are each independently a substituted or unsubstituted C4 to C20 alicyclic organic group, or a substituted or unsubstituted C6 to C30 aromatic organic group, wherein the aromatic organic group comprises one aromatic ring, two or more aromatic rings fused together to provide a condensed ring system, or two or more moieties linked through a single bond or through a functional group selected from a fluorenylene group, —O—, —S—, —C(═O)—, —CH(OH)—, —S(═O) 2 —, —Si(CH 3 ) 2 —, —(CH 2 ) p — wherein 1≦p≦10, —(CF 2 ) q — wherein 1≦q≦10, —C(CH 3 ) 2 —, —C(CF 3 ) 2 —, —C(═O)NH—, a substituted or unsubstituted C3 to C10 cycloalkylene group, and a substituted or unsubstituted C6 to C15 arylene group, 
         R 3  to R 5  are the same or different, and are each independently selected from a C1 to C20 alkyl group, a C6 to C20 aryl group, and a halogen, 
         n1 is an integer from 0 to 5, 
         n2 and n3 are the same or different, and are each independently an integer from 0 to 4, and 
         0.001≦x≦0.3. 
       
     
     
         14 . The polymer according to  claim 13 , wherein
 R 1  is selected from the chemical formulae:   
       
         
           
           
               
               
           
         
         and 
         R 2  is 
       
       
         
           
           
               
               
           
         
       
     
     
         15 . The polymer according to  claim 13 , wherein one or more of R 3  to R 5  are the same or different, and are each independently a C1 to C4 alkyl group. 
     
     
         16 . The polymer according to  claim 13 , wherein 0.005≦x≦0.25. 
     
     
         17 . The polymer according to  claim 13 , wherein 0.01≦x≦0.1. 
     
     
         18 . An optical film comprising the composition according to  claim 1  or the polymer according to  claim 14 . 
     
     
         19 . The film according to  claim 18 , wherein the film has a coefficient of thermal expansion of less than or equal to about 300 parts per million per degree Centigrade in a temperature range of 50° C. to 400° C. 
     
     
         20 . An optical device comprising the optical film according to  claim 19 .