| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject film which is excellent in heat resistance, chemical resistance, electrical insulating property and dielectric properties as well as in affinity to adhesives and electroconductive coating materials, by making the molar ratio of the oxygen atom to the carbon atom in the surface region of a film not less than a specific number of times as large as that inside the film, the film comprising a thermoplastic polymer which can form an optically anisotropic molten phase. SOLUTION: The molar ratio of the oxygen atom to the carbon atom in the surface region of this film is made not less than 1.2 times as large as that inside the film. This film is produced by subjecting a thermoplastic liq. crystal polymer film to a gas plasma treatment in the presence of a gaseous oxygen atom-contg. compd. The thermoplastic liq. crystal polymer pref. has an m.p. of about 200 to about 400 deg.C. The molecular orientation of this polymer film is pref. <=1.3. As the oxygen atom-contg. compd., O2 gas, CO2 gas or CO gas is preferable. The thus obtd. film has a surface excellent in adhesion to an electroless plating layer.
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