C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/59, 403/67
C08J 9/14 (2006.01) C08J 9/04 (2006.01) C08J 11/08 (2006.01)
Patent
CA 1042150
ABSTRACT This invention relates to a novel process for preparing novel foamed polymeric products having uniform cell structure which comprises mixing a non-volatile polar substance, a foaming agent and an ionic polymer, said non-volatile polar substance being a preferential plasticizer for said ionic polymer and said foaming agent characterized as being sparingly soluble in said ionic polymer, subjecting said mixture to an elevated temperature and pressure whereby said foaming agent and said non-volatile polar substance are impregnated into said ionic polymer, and foaming said impregnated ionic polymer. Preferably the ionic polymer comprises from about .2 to 20 mole % pendant ionic groups, especially sulfonate groups. In a preferred embodiment of the instant invention a sulfonated polystyrene polymer is admixed with a non-volatile polar compound and a foaming agent which is characterized as having a solubility parameter of less than 7.9 and a boiling point of less than 100°C, under elevated pressure and temperature whereby said foaming agent and said non-volatile polar compound are impregnated into said sulfonated polystyrene polymer and the resultant mixture foamed at atmospheric pressure ant at a temperature of at least 105°C. Upon cooling, a low to moderate density foam of uniform cell structure is formed which can be reprocessed by admixing with a low boiling solvent for polystyrene and a non-volatile polar substance, removing said low boiling solvent and repeating the above foaming process.
195028
Brenner Douglas
Lundberg Robert D.
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