▎ 摘　　要

NOVELTY - Ink comprises binder containing 10-25 wt.% resin, 8-12 wt.% graphene as filler and 55-75 wt.% solvent, and 1-15 wt.% coupling agent for chemically connecting the filler and the resin and improving dispersibility function of the filler. USE - The ink is useful for producing graphene sheet, shielding film, heat-radiating film, and electrode material for flexible substrate (all claimed). ADVANTAGE - The ink has improved high thermal and electromagnetic shielding characteristics (claimed), and improves electrical conductivity and reduces electrical resistance of electrode material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing ink, comprising (a) mixing 10-25 wt.% polyurethane diol having molecular weight of 350 with 55-75 wt.% solvent to prepare an organic vehicle, (b) mixing 8-12 wt.% graphene in the organic vehicle to prepare a first solution, (c) mixing the first solution with 1-15 wt.% coupling agent to prepare a second solution, and (d) dispersing the second solution using ultrasonic waves for predetermined period of time.