C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/189 (2006.01) C08G 63/42 (2006.01) C08G 63/87 (2006.01)
Patent
CA 2051688
This invention relates to a method of preparing poly(ethylene-2,6-naphthalene dicarboxylate) by the polycondensation reaction of ethylene glycol and dimethyl-2,6-naphthalene dicarboxylate, using a dimethyl-2,6-naphthalene dicarboxylate starting material which contains significant amounts of methyl hydrogen 2,6-naphthalene dicarboxylate as a contaminant The methyl hy- drogen 2,6-naphthalene dicarboxylate moiety is incorporated into the polymer structure by initially esterifying the methyl hydrog- en 2,6-naphthalene dicarboxylate acid end-group with ethylene carbonate, in the presence of an amine or ammonium catalyst, be- fore the polyesterification/polycondensation reaction is performed.
Sublett Bobby Jones
Trotter Jimmy Ray
Eastman Chemical Company
Gowling Lafleur Henderson Llp
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