Abstract: A rewritable or repeatedly employable recording medium having a base and a recording layer film provided on said base, characterized in that said recording layer film is formed by a thermotropic cholesteric liquid crystal polyester.

Abstract: An optical filter consisting essentially of a glutamate copolymer having thermotropic cholesteric liquid crystal properties and represented by the general formula: ##STR1## wherein R.sub.1 is an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 10 or less carbon atoms, and R.sub.2 an alkyl group, a cycloalkyl group, an aryl group or an arylalkyl group having 6 to 30 carbon atoms, provided that R.sub.1 and R.sub.2 are different from each other; m and n are numbers satisfying the following relationships 50.ltoreq.m+n.ltoreq.2000 and m/n=80 to 10/20 to 90.

Abstract: A rewritable or repeatedly employable recording medium having a base and a recording layer film provided on said base, characterized in that said recording layer film is formed by a thermotropic cholesteric liquid crystal polyester.

Abstract: A process for producing a cholesteric liquid crystal polyester film or sheet possessing an ordered planar texture (monodomain structure), which process comprises providing a cholesteric liquid crystal polyester in which 1 to 10 mol % of constituent monomer units are optically active, allowing the cholesteric liquid crystal polyester to be formed in the temperature range of 150.degree. to 350.degree. into a film or sheet having a thickness not larger than 100 .mu.m, and then cooling the film or sheet rapidly.

Abstract: A cholesteric liquid crystal polyester consisting essentially of structural units represented by the following formulae (A), (B) and (C): ##STR1## which is optically active; and ##STR2## wherein X is hydrogen, halogen, or alkyl having not more than four carbon atoms.

Abstract: A cholesteric liquid crystal polyester consisting essentially of structural units represented by the following formulae (A), (B), (C), (D) and (E): ##STR1## the units (A) and (B) being present each in a proportion of 5 to 50 mol %, the unit (C) present in a proportion of 20 to 80 mol %, and the units (D) and (E) present each in a proportion of 1 to 40 mol %.

Abstract: A thermosetting resin composition having an improved crack resistance comprising 100 weight parts of a curable epoxy resin and 30 to 300 weight parts of a phenol compound-added conjugated diolefin polymer, which is prepared in the presence of aluminum phenoxide as the catalyst. The composition is suitable for resin encapsulation of electronic components.

Abstract: A curable resin composition consisting essentially of an amidated polybutadiene and a phenolic resin, and a laminate containing the resin composition in cured form and having excellent electrical properties and cold punching workability.

Abstract: A curable resin composition is disclosed for use in the manufacture of laminates applied to electronics equipment. The composition essentially comprises a resol type phenolic resin which is obtained from the reaction of an amidated drying oil and a phenol-formal dehyde in the presence of an alkali catalyst. Another form of the composition includes an amidated butadiene polymer to provide improved flexibility and chemicals resistance.