Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1984-03-29
1985-12-31
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528172, 528173, 528176, 528184, 528193, 528194, 528206, 528208, 528271, C08G 6306, C08G 6316, C08G 6360, C08G 6944
Patent
active
045622442
ABSTRACT:
An improved polymerization process is provided for the formation of a polyester which is capable of forming an anisotropic melt phase and which optionally may include amide linkages. An approximately 0.25 to 4 percent molar excess of aliphatic dicarboxylic acid monomer containing 4 to 12 carbon atoms (e.g. azelaic acid) and/or an esterified derivative thereof is provided in the polymerization zone during the polymerization reaction. Such monomer imparts dicarboxyaliphatic units to the interior of the resulting polymer chains and causes the polymer chains to terminate in carboxylic acid end groups and/or an esterified 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 substantially incapable of additional chain growth upon subsequent heating and accordingly may be relied upon to maintain a substantially constant viscosity during melt processing regardless of the duration of heating.
REFERENCES:
patent: 4248995 (1981-02-01), Fayolle
patent: 4390681 (1983-06-01), Deex
patent: 4398019 (1983-08-01), Cox et al.
patent: 4474938 (1984-10-01), Richardson
Celanese Corporation
Lee Lester L.
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