Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1988-06-16
1990-10-09
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528190, 528193, 528194, C08G 6318, C08G 6302
Patent
active
049621807
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the production of aromatic polyesters through polycondensation of mono- or multi-nuclear substituted or unsubstituted diphenols with halides of aromatic dicarboxylic acid according to the two-phase interface polycondensation process, where from the aqueous phase, consisting of a solution of the diphenols, alkaline hydroxide for the formation of the diphenolates and possibly a phase transfer catalyst in water or in a mixture of water and an organic solubilizer with the organo-liquid phase consisting of a solution of an acidic halide in an organic solvent, a fine reaction emulsion is produced, with the diphenolates having been converted to the organo-liquid phase entering into polycondensation reactions with the acid halides.
Processes of the above mentioned kind have been known for a long time, for example, also from U.S. Pat. No. 3 216 970. The polycondensation process here is carried out as batch process, where the aqueous and the organo-liquid phase are mixed in a reaction vessel while being vigorously stirred and the polyester forming in the polycondensation following the separation of the phases is finally precipitated from the organo-liquid phase.
The polyesters produced according to such batch process, however, frequently have a molecular weight distribution with a relatively high oligomer component, which in many cases negatively effects, for example, the material properties of films produced from such polyesters. In addition, when greater batches are used in these processes the difficulty is encountered of stirring the emulsion sufficiently, the viscosity of which increases rapidly with progressing polymer formation as well as--due to the exothermicity of the process--to maintain the emulsion at the desired low reaction temperature through high cooling expenditures. In addition, the results of such batch processes cannot readily be reproduced. The invention is based on the task of indicating a process of the initially mentioned kind, which permits the production of aromatic polyesters in large quantities in a readily reproducible manner, which polyesters have only a small fraction of oligomers.
The task, on which the invention is based, is solved in the process according to the invention, which is characterized in that for a continuous process a fine pre-emulsion is prepared from the aqueous phase and an organic solvent, that the pre-emulsion and the organo-liquid phase are fed into the input of a dispersing unit in quantities, that the compounds participating in the polycondensation reaction are mixed at constant proportions in the dispersing unit for the formation of the reaction emulsion, and that the reaction emulsion, subsequently, passes sequentially through one or several dispersing units and/or static mixers. Advantageously, the aqueous phase is the lesser component by volume in the volume of the reaction emulsion and possibly also the pre-emulsion, so that the organo-liquid phase respectively the organic solvent forms the continuous phase of the particular emulsion.
The used bi-nuclear diphenols are preferrentially compounds having the formula ##STR1## in which Z is a single bond, ##STR2## a bi-functional aliphatic hydrocarbon residue or a bi-functional hydrocarbon residue containing at least one aromatic or cycloaliphatic ring, as well as alkylated or halogenated derivatives of such compounds.
The process according to the invention covers also the use of mixtures of different diphenolates as well as mixtures of different acid chlorides.
According to an advantageous form of the invention, the reaction emulsion initially passes through one or several static mixers, subsequently through a dispersing unit, and, subsequently, again through one or several static mixers.
According to a further advantageous form of the invention, the process according to the invention is characterized in that dispersing units are used, which each has a rotor rotating at a circumferential speed of at least 5 m/s, preferentially, however, at least 10 m/s, provided with several
REFERENCES:
patent: 4401803 (1983-08-01), Rieder
Anderson Harold D.
Isovolta Osterreichische Isolierstoffwerke Aktiengesellschaft
Mosley T.
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