Artificial stone compositions, process of producing the same, and apparatus employed in the production thereof

A thermosettable molding composition comprising an intimately mixed and substantially airless mixture of

• A. a first portion comprising:
• between about 10 to about 25 parts by weight of a polyester comprising the reaction product of (i) at least one acyclic ethylenically unsaturated dicarboxylic acid or anhydride thereof (ii) at least one aromatic dicarboxylic acid and (iii) a C.sub.2 -C.sub.8 glycol;
• between about 10 and about 25 parts by total weight of at least two ethylenically unsaturated monomers;
• between about 50 and about 80 parts by weight of deagglomerated particles selected from the group consisting of alumina trihydrate, borax, hydrated magnesium, calcium carbonate and calcium sulfate dihydrate, said particles having a mean size of between about 5 microns and about 20 microns, and having a maximum size of about 50 microns and a minimum size of about 0.1 micron, said particles being substantially coated by said monomer and said polyester;
• and
• B. a second portion comprising a first free radical producing curing agent which is initiated at a temperature of between about 100.degree. F. and about 200.degree. F. and a second free-radical producing curing agent which is initiated at a temperature of between about 150.degree. F. and 300.degree. F.