Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1991-12-12
1992-09-22
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528176, 528194, C08G 6302, C08G 6318
Patent
active
051497697
ABSTRACT:
In a continuous process for the manufacture of aromatic polyesters by polycondensation of mono- or multi-nuclear substituted or unsubstituted diphenols, with halides of aromatic dicarboxylic acids according to the two-phase interface polycondensation process, the first step is to produce continuously a fine pre-emulsion with an organic solvent and from the aqueous phase, consisting of a solution obtained from the diphenols, of an alkaline hydroxide in order to form the diphenates and possibly of a phase transfer catalyst in water or in a mixture of water and of an organic solubilizer. This pre-emulsion is fed in quantities to a dispersion unit jointly with the organo-liquid phase forming the acid chloride solution. The compounds involved in the polycondensation reaction are mixed in the dispesion unit in constant proportions in order to produce a reaction emulsion which then passes successively through one or several dispersion units and/or into static mixers, the polycondensation taking place and being completed during this period. The phases are then separated and the polyester formed is precipitated from the organic phase.
REFERENCES:
patent: 3216970 (1965-11-01), Conix et al.
patent: 4401803 (1983-08-01), Rieder
Isovolta Osterreichische Isolierstoffwerke
Kight III John
Mosley T.
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