초록 ▼

An extruded polyolefin foam in thicknesses of at least about 12 mm and greater of improved compressive strength, extensional viscosity, and reduced aging time and a process for making the foam are disclosed. The foam is prepared using a propane blowing agent. The beneficial properties imparted to th

An extruded polyolefin foam in thicknesses of at least about 12 mm and greater of improved compressive strength, extensional viscosity, and reduced aging time and a process for making the foam are disclosed. The foam is prepared using a propane blowing agent. The beneficial properties imparted to thicker grade and plank foams by a propane blowing agent can be achieved with up to as much as 75% by volume of either normal butane or isobutane or both in the blowing agent, depending on the polyolefin selected.

대표청구항 ▼

[ What is claimed is:] [1.] An extruded polyolefin foam having a nominal thickness of at least about 12 mm wherein said foam is expanded by a blowing agent comprising from about 25 to 100 percent by weight of propane and from about 0 to 75 percent by weight of isobutane, normal butane, or a mixture

[ What is claimed is:] [1.] An extruded polyolefin foam having a nominal thickness of at least about 12 mm wherein said foam is expanded by a blowing agent comprising from about 25 to 100 percent by weight of propane and from about 0 to 75 percent by weight of isobutane, normal butane, or a mixture of isobutane and normal butane, and wherein said blowing agent does not substantially alter the extensional viscosity of said polyolefin.