BUTADIENE OLIGOMER WITH HYDROXYL GROUPS AT BOTH ENDS, FLEXOGRAPHIC PRINTING PLATE, LIQUID CRYSTAL ORIENTATION FILM AND METHOD FOR REMOVING LOW MOLECULAR WEIGHT COMPONENTS FROM BUTADIENE OLIGOMER WITH HYDROXYL GROUPS AT BOTH ENDS

摘要

Provided are a butadiene oligomer with hydroxyl groups at both ends, in which only low-molecular weight components are favorably removed with high efficiency without changing the molecular weight or the like; a flexographic printing plate composed of the butadiene oligomer with hydroxyl groups at both ends; and a liquid crystal orientation film formed by flexographic printing using the flexographic printing plate. Low molecular weight components are removed in the butadiene oligomer with hydroxyl groups at both ends through processes of stirring an oligomer with a solvent, separating through incubation, and performing a decantation treatment from a raw oligomer, all of which do not involve heating. The flexographic printing plate is prepared using the butadiene oligomer with hydroxyl groups at both ends as a starting material. The liquid crystal orientation film is formed by flexographic printing using the a flexographic printing plate.