Patent ID: 7727435

Claim:
The process of making an engineered stone composition, which comprises (1) blending from 3 to 10% of a crosslinkable matrix resin with at least 80% by weight of the total composition of a siliceous or calcareous mineral particulate and from 0.05 to 5% of an acrylic phosphate until a uniform mixture is obtained, (2) placing the resulting mixture in a mold and subjecting such to vibration to condense the mixture, compression molding the resulting mixture under vacuum conditions until volume of the original mixture is reduced by at least 40% and thereafter crosslinking the matrix resin, (3) comminuting the product of step 2 into a particulate aggregate, (4) blending from 3 to 10% of a crosslinkable unsaturated polyester or acrylic resin with at least 80% by weight of the total composition with the particulate aggregate of step 3 until a uniform mixture of the aggregate in the matrix resin is obtained, and (5) placing the mixture of step 4 in a mold and subjecting such to vibration to condense the mixture, compression molding the resulting mixture under vacuum until the volume of the initial mixture is reduced by at least 40% and thereafter crosslinking the matrix resin.