Thermosetting resins reinforced with cut yarns

A moldable composition of polymerizable resins reinforced by cut yarns comprising:

• an unsaturated polyester in an amount between about 13 and 20 weight percent, a thermoplastic polymer in an amount of between about 10 and 15 weight percent, a liquid monomer in an amount of between about 0.01 and 2 weight percent, an inert mineral filler in an amount of between about 40 and 55 weight percent;
• and cut glass yarns in an amount of between about 15 and 25 weight percent;
• wherein the cut yarns are of single and multiple filaments of different lengths with the single filaments being longer in length than the multiple filaments and wherein the amount of multiple filament yarn is greater than the amount of single filament yarn.

A process for obtaining a moldable composition of polymerizable resins reinforced by cut yarns which comprises:

• mixing an unsaturated polyester, a thermoplastic polymer, a monomer liquid substance having at least one polymerizable reactive CH.sub.2 .dbd.C<group per molecule, and an inert mineral filler to form a resin;
• mixing cut yarn coated with an insoluble lubricant to the resin to form a mixture;
• and mixing cut yarn coated with a soluble lubricant to the mixture to form a moldable composition.