C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/183, 402/314
C08G 63/60 (2006.01) C08G 69/44 (2006.01)
Patent
CA 1238747
IMPROVED PROCESS FOR FORMING THERMALLY STABLE THERMOTROPIC LIQUID CRYSTALLINE POLYESTERS OF PREDETERMINED CHAIN LENGTH UTILIZING AROMATIC HYDROXYL MONOMER AND/OR AROMATIC AMINE MONOMER Abstract of the Disclosure An improved polymerization process is provided for the formation of a polyester which is capable of forming an aniso- tropic melt phase and which optionally may include amide linkages. An approximately 0.25 to 4 percent molar excess of aromatic hydroxyl monomer and/or aromatic amine monomer and/or an esterified and/or amidated derivative thereof is provided in the polymerization zone during the polymerization reaction. Such monomer imparts dioxyaryl, diaminoaryl, or oxyaminoaryl units to the interior of the resulting polymer chains and causes the polymer chains to terminate in hydroxyl end groups and/or an esterified derivative thereof and/or amino end groups and/or an amidated derivative thereof wherein the polymer chains achieve a predetermined average chain length through the depletion of other monomers present in the polymerization zone. The resulting polyester unlike the usual product of the prior art is substan- tially incapable of additional chain growth upon subsequent heating and accordingly may be relied upon to maintain a substantially constant viscosity during melt processing regard- less of the duration of heating.
473571
Celanese Corporation
Smart & Biggar
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