Solid state polymerization process for foamed poly(ethylene...

Details Solid state polymerization process for foamed poly(ethylene... Solid state polymerization process for foamed poly(ethylene...

C - Chemistry, Metallurgy

08

G

C08G 63/80 (2006.01) C08G 63/189 (2006.01) C08J 9/12 (2006.01) C08J 9/30 (2006.01)

Patent

CA 2165149

This invention includes a process for preparing a solid state polymerized poly(ethylene naphthalate) (PEN) polymer or copolymer thereof comprising: (1) preparing a molten prepolymer with an intrinsic viscosity of from 0.25 dl/g to 0.50 dl/g, (2) dispsersing an inert gas into the molten prepolymer to form a foamed PEN prepolymer with a void fraction of from 0.10 to 0.50, (3) forming the foamed PEN prepolymer into granules, (4) devolatilizing the granular PEN prepolymer at a temperature of from 80 °C to 140 °C, (5) crystallizing the devolatilized PEN prepolymer at a temperature of from about 150 °C to 260 °C, and (6) solid state polymerizing the crystallized PEN prepolymer at a temperature of from 235 °C to about 265 °C to form a solid state polymerized PEN polymer or copolymer thereof.

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