Coated, heat shrinkable expanded polystyrene

Abstract From the Canadian patent

Abstract of the Disclosure, A composition and method for color coating an expanded polystyrene "drop-out" ceiling tile by which its heat, shrinking drop-out characteristic is preserved. The composition comprises a water soluble salt of a polymer of acrylic acid as a film forming component, a plasticizing component a, pigment component and a pigment dispersing component such as clay. The ceiling drop-out and surface flame properties of the polyacrylate coated expanded polystyrene substrate compare favorably with those of uncoated expanded polystyrene used for the same purpose.