초록 ▼

Pre-expanded styrene polymer particles, which may contain one or more pre-expanded styrene polymer beads, are coated with sufficient water glass so that the particles, when dried to a reversible, tack-free pourable state, comprise from about 30% to 80% styrene polymer solids. The particles may be sh

Pre-expanded styrene polymer particles, which may contain one or more pre-expanded styrene polymer beads, are coated with sufficient water glass so that the particles, when dried to a reversible, tack-free pourable state, comprise from about 30% to 80% styrene polymer solids. The particles may be shaped into a desired article configuration and then dried to a tack-free state, the particles adhering together through the water glass, and the resulting article having a bulk density of from about 1.25 lbs. to 3 lbs. per cubic foot. The water glass or the pourable particles may be treated to decrease alkalinity and to cause irreversible precipitation of water glass solids, rendering the final product essentially waterproof.

대표청구항 ▼

A non-combustion-supporting insulating material which, upon application thereto of a flame, disintegrates to a fine ash, the material comprising a mass of styrene polymer beads, the particles having individual coatings of expanded dried water glass adhering the particles into a mass having a bulk de

A non-combustion-supporting insulating material which, upon application thereto of a flame, disintegrates to a fine ash, the material comprising a mass of styrene polymer beads, the particles having individual coatings of expanded dried water glass adhering the particles into a mass having a bulk density of from about 1.5 lbs. to about 2 lbs. per cubic foot, the mass containing from about 30 to about 80 percent of styrene polymer solids and about 20 to about 70 percent of dried water glass, by weight.