C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/661
C08J 9/12 (2006.01) B29C 44/34 (2006.01) B29C 47/00 (2006.01) C08J 9/14 (2006.01)
Patent
CA 1309221
Abstract A method for producing a styrene polymer extruded foam body having an average cell size of from about 0.05 millimeter (mm) to about 3.5 mm, a density of from about 1.0 pound per cubic foot (pcf) to about 5.0 pcf, a minimal cross-sectional thickness of one half (1/2) inch and a minimal cross-sectional area of eight (8) square inches comprises the steps of: heat plastifying the alkenyl aromatic synthetic resin; introducing the plastified resin into a mixing device; introducing a blowing agent into the mixing device;maintaining a pressure in the mixing device at or above a pressure greater than an equilibrium vapor pressure of the blowing agent in the alkenyl aromatic synthetic resin and blowing agent mixture; passing the mixture through a cooling device; passing the mixture through a die having a given die pressure greater than atmospheric pressure; maintaining a specific defined minimum critical pressure drop, .DELTA.Pc, between the pressure at the inlet of in the mixing device and the inlet of the die. Blowing agents useful in such process are disclosed as well stryene polymer foam bodies made by the process and consistently having improved uniformity of surface quality.
564112
Smart & Biggar
The Dow Chemical Company
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