Patent ID: 9644079
Date: 2017-05-09
CPC Classifications: C08J

Claim:
1. A process of forming a molded shaped expanded polystyrene product formed from expanded polystyrene beads having internal cells of a size typically generated by including a larger amount of pentane in the formulation, comprising: heating a mixture of styrene, demineralized water, brominated flame retardant chemicals, a peroxide which is a first polymerization initiator, paraffin, tricalcium phosphate (TCP), a surfactant, an extender and D-limonene to a first polymerization temperature; adding 3-8% by weight pentane and a second polymerization initiator to the mixture and heating to a second polymerization temperature to form EPS beads having cells as large as if about 25% more pentane was used than the amount of pentane which actually was used; melting the beads inside an extrusion mold; and extruding, cutting and cooling the extruded product.