PURPOSE: To obtain the title easily moldable composition which can give a three-dimensional cured product of a low dielectric constant and excellent heat resistance, by prereacting 1,5,9-cyclododecatriene with a specified polymaleimide in an inert solvent.
CONSTITUTION: 10W30wt% 1,5,9-cyclododecatriene (A) which is a nonconjugated cyclotriene obtained by cyclopolymerizing three 1,3-butadiene molecules is prereacted with 90W70wt% polymaleimide (B) of the formula (wherein R1 is an n-valent 2C or higher organic group and a is 2W10), e.g., N,N'-p,p'- diphenylmethanebismaleimide, at 100W200°C in an inert solvent (C) (e.g., cyclohexane) in an amount to give a resin content ≤70wt% to the obtained varnish to obtain the title composition which is a varnish which, even when cooled to room temperature, does not cause phase separation and can be kept in a uniform state. If necessary, an organic peroxide as a radical reaction initiator may be added to this composition.
MIYADERA YASUO
FUJIOKA ATSUSHI
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