Resin composition, stretched film, circularly polarizing plate, and image display device

A resin composition, comprising a polymer having a divalent oligofluorene as a repeating unit, wherein:

• the divalent oligofluorene contains at least two fluorene units optionally having a substituent;
• 9-positioned carbon atoms of the fluorene units bond to each other via a direct bond, via an alkylene group optionally having a substituent, via an arylene group optionally having a substituent, or via an aralkylene group optionally having a substituent;
• a molar fraction of the divalent oligofluorene to the polymer is 1% or more;
• and
• the resin composition has a positive refractive index anisotropy.

An oligofluorene-diol represented by formula (19):

• wherein:
• R3 represents an optionally-substituted alkylene group having from 1 to 10 carbon atoms, an optionally-substituted arylene group having from 4 to 10 carbon atoms, or an optionally-substituted aralkylene group having from 6 to 10 carbon atoms;
• R4 to R9 each independently represent a hydrogen atom, an optionally-substituted alkyl group having from 1 to 10 carbon atoms, an optionally-substituted aryl group having from 4 to 10 carbon atoms, an optionally-substituted acyl group having from 1 to 10 carbon atoms, an optionally-substituted alkoxy group having from 1 to 10 carbon atoms, an optionally-substituted aryloxy group having from 1 to 10 carbon atoms, an optionally-substituted amino group, a substituent-having sulfur atom, a halogen atom, a nitro group, or a cyano group;
• at least two adjacent groups of R4 to R9 may bond to each other to form a ring;
• and
• n is an integer of from 1 to 5.

A method for producing an oligofluorene diester represented by the formula (VII-1), comprising:

• reacting an oligofluorene compound represented by the formula (II) with an unsaturated carboxylate ester represented by formula (VI-1) in the presence of a base:
• wherein:
• R3 represents a direct bond, an optionally-substituted alkylene group having from 1 to 10 carbon atoms, an optionally-substituted arylene group having from 4 to 10 carbon atoms, or an optionally-substituted aralkylene group having from 6 to 10 carbon atoms;
• R4 to R9 each independently represent a hydrogen atom, an optionally-substituted alkyl group having from 1 to 10 carbon atoms, an optionally-substituted aryl group having from 4 to 10 carbon atoms, an optionally-substituted acyl group having from 1 to 10 carbon atoms, an optionally-substituted alkoxy group having from 1 to 10 carbon atoms, an optionally-substituted aryloxy group having from 1 to 10 carbon atoms, an optionally-substituted amino group, a substituent-having sulfur atom, a halogen atom, a nitro group, or a cyano group;
• at least two adjacent groups of R4 to R9 may bond to each other to form a ring;
• Riii represents a hydrogen atom, an optionally-substituted alkyl group having from 1 to 10 carbon atoms, an optionally-substituted aryl group having from 4 to 10 carbon atoms, or an optionally-substituted aralkyl group having from 6 to 10 carbon atoms;
• R17 represents an organic substituent having from 1 to 10 carbon atoms;
• and
• n is an integer of from 1 to 5.

An oligofluorene diaryl ester represented by formula (10d):

• wherein:
• R1 and R2 each independently represent a direct bond, an optionally-substituted alkylene group having from 1 to 10 carbon atoms, an optionally-substituted arylene group having from 4 to 10 carbon atoms, an optionally-substituted aralkylene group having from 6 to 10 carbon atoms, or a group formed by bonding at least two groups selected from the group consisting of an optionally-substituted alkylene group having from 1 to 10 carbon atoms, an optionally-substituted arylene group having from 4 to 10 carbon atoms, and an optionally-substituted aralkylene group having from 6 to 10 carbon atoms, via an oxygen atom, an optionally-substituted sulfur atom, an optionally-substituted nitrogen atom, or a carbonyl group;
• R3 represents an optionally-substituted alkylene group having from 1 to 10 carbon atoms, an optionally-substituted arylene group having from 4 to 10 carbon atoms, or an optionally-substituted aralkylene group having from 6 to 10 carbon atoms;
• R4 to R9 each independently represent a hydrogen atom, an optionally-substituted alkyl group having from 1 to 10 carbon atoms, an optionally-substituted aryl group having from 4 to 10 carbon atoms, an optionally-substituted acyl group having from 1 to 10 carbon atoms, an optionally-substituted alkoxy group having from 1 to 10 carbon atoms, an optionally-substituted aryloxy group having from 1 to 10 carbon atoms, an optionally-substituted amino group, a substituent-having sulfur atom, a halogen atom, a nitro group, or a cyano group;
• at least two adjacent groups of R4 to R9 may bond to each other to form a ring;
• Ar1 represents an optionally-substituted aryl group having from 4 to 10 carbon atoms;
• and
• n is an integer of from 1 to 5.