Liquid crystal device including insulating film, light control window and production method

A liquid crystal device, comprising:

• a liquid crystal layer,
• a first substrate,
• a second substrate,
• an insulating film, and
• no alignment films, wherein:
• the liquid crystal layer is arranged between the first substrate and the second substrate,
• the first substrate includes electrode 1,
• the second substrate includes electrode 2,
• the insulating film is arranged between electrode 1 and electrode 2, adjacent to and in contact with the liquid crystal layer and at least one of electrode 1 and electrode 2,
• the liquid crystal layer contains a polymer-network structure, a polymer-dispersed structure, or a mixture of both, and
• the insulating film has no alignment control properties and is a cured product of a thermosetting polymer composition, wherein:
• the thermosetting polymer composition is a composition containing polyester amide acid, an epoxy compound, an epoxy curing agent and a solvent,
• the polyester amide acid is obtained by allowing a mixture of tetracarboxylic dianhydride, diamine and a polyhydroxy compound to react,
• the thermosetting polymer composition satisfies expressions:
• 1.0<Z/Y<5.0 and 0.6<(Y+Z)/X<2.0, in which X represents a molar concentration of the tetracarboxylic dianhydride, Y represents a molar concentration of the diamine and Z represents a molar concentration of the polyhydroxy compound,
• the epoxy compound is contained in 20 to 400 parts by weight based on 100 parts by weight of the polyester amide acid, and
• the insulating film is obtained by (a) applying the thermosetting polymer composition to either one of the first substrate or the second substrate, and (b) heating the resulting material.