Polymerizable compositions and in-mold cured products using same

A polymerizable composition comprising unsaturated urethane shown by Formula (1) given below, vinyl monomer copolymerizable with said unsaturated urethane, and an inorganic powder filler, said unsaturated urethane and said vinyl monomer being contained at weight ratio 10/90-90/10, said inorganic powder filler being contained at a rate of 30-300 weight parts per 100 weight parts of the sum of said unsaturated urethane and said vinyl monomer:

• ##STR3## where R.sup.1 is hydrogen atom or methyl group;
• X is a residual group obtained by removing isocyanate groups from diisocyanate;
• Y is a residual group obtained by removing hydroxyl groups from non-radical polymerizable di-ol or tri-ol selected from the group consisting of (a) partial esters derivable from alkane monocarboxylic acid or alkene monocarboxylic acid with 5-22 carbon atoms and trihydric or tetrahydric poly-ol, (b) partially etherified trihydric or tetrahydric poly-ols with alkyl or alkenyl group with 5-22 carbon atoms, (c) 1,2-alkane di-ols with 6-22 carbon atoms or polyoxyalkylene alkane di-ols obtainable by addition of alkylene oxide with 2-4 carbon to 1,2-alkane di-ol with 6-22 carbon atoms, (d) partial or complete esters obtainable from hydroxy alkane monocarboxylic acid or hydroxy alkene monocarboxylic acid with 5-22 carbon atoms and dihydric or trihydric alcohol and (e) esters obtainable from 1 mole of alkyl or alkenyl succinic acid with alkyl or alkenyl group with 5-22 carbon atoms and 2 moles of (polyoxy)alkylene glycol with alkylene group with 2-4 carbon atoms;
• Z is an organic group in the form of (R.sup.2 O).sub.m or R.sup.3 O, R.sup.2 being an alkylene group with 2-4 carbon atoms, R.sup.3 being an alkylene group with 2-12 carbon atoms, and m being an integer 2-10;
• and n is 2 or