Method for manufacturing liquid crystal orientation film

Abstract

A method for liquid crystal orienting film is disclosed, comprising: a step of preparing a thin film by laminating a monomolecular film on a substrate having an electrode formed thereon, said monomolecular film being formed by spreading on water surface an amphiphilic high molecular material having a repeating unit as represented by the following general formula (1): ##STR1## wherein R.sup.1 is a tetravalent group containing at least two carbon atoms, R.sup.2 is a divalent group containing at least two carbon atoms and each of R.sup.3 and R.sup.4 is an aliphatic, an alicyclic or an aromatic monovalent group having 1-30 carbon atoms or combinations thereof, which may be substituted by a halogen atom, a nitro group, an amino group, a cyano group, a methoxy group or an acetoxy group, or a hydrogen atom, and at least one of R.sup.3 and R.sup.4 is an aliphatic, an alicyclic or an aromatic monovalent group having 12-30 carbon atoms or combinations thereof, which may be substituted by a halogen atom, a nitro group, an amino group, a cyano group, a methoxy group or an acetoxy group, and a step of partially imidizing the resulting thin film to a polyimide represented by the following general formula (2): ##STR2## wherein R.sup.1 and R.sup.2 are the same as in the general formula (1), so that the monovalent group having 12-30 carbon atoms contained in the thin film remains at the ratio of 1.5-0.8 pieces per repeating unit as represented by the above general formula (1).

Dependencies are inferred from the claim text.