Patent ID: 8088882

Claim:
A high transparency polyimide precursor consisting of repeating units represented by the following formula (3), wherein a rate of change in term of the polystyrene calibrated-weight average molecular weight by gel permeation chromatography of a 0.5 wt % solution of the polyimide precursor in N-methylpyrrolidone solvent substantially containing water is 20% or less after stored at 23° C. for 25 hours: wherein, each of R 1 to R 6 is independently a hydrogen atom or a monovalent organic group, which may be bonded to each other; each of R 7 , R 8 , R 11 and R 12 is independently a hydrogen atom, a halogen atom, a hydroxyl group, a mercapto group, a cyano group, a silyl group, a silanol group, an alkoxy group, a nitro group, a carboxyl group, an acetyl group, an acetoxy group, a sulfo group, a saturated or unsaturated alkyl group, a saturated or unsaturated halogenated alkyl group, an aromatic group, an allyl group or an ethylenically unsaturated bond containng group; “X” is a divalent organic group having an aromatic ring; each of R 9 , R 10 , R 13 and R 14 is independently a hydrogen atom or a monovalent organic group; “Y” is a tetravalent organic group; “Z” is a divalent organic group having an aromatic ring; groups represented by the same symbol among repeating units in the same molecule may be different atoms or structures; and at least one of “o” and “p” is a natural number of 1 or more, and “o”, “p” and “q” are natural numbers of 0 or more, and further wherein a total amount of the repeating units (1a) and (1b) in the formula (3) is 50% by mole or more of repeating units constituting a polymer skeleton of the high transparency polyimide precursor.