Sumitomo Chemical Company, Limited

Haruo Suzuki

Kuniaki Asai

Katsuji Ueno

Shozaburo Imai

Yasuyuki Kato

Takashi Maruyama

Junichi Kimura

Hiroaki Sugimoto

Teruo Saito

Masatsune Kondo

Zyunso Saito

Katsuzi Ueno

A method for prevention of loss of transparency of shaped articles prepared from a polyarylene ester blend comprising a polyarylene ester and other thermoplastic resin when treated with steam or boiling water, which comprises reducing the sodium content of the blend to less than 70 ppm.

Method for prevention of loss of transparency of polyarylene ester blends

A process for producing by bulk polycondensation an aromatic polyester of the formula, ##STR1## wherein X is a hydrocarbon radical having 1 to 20 carbon atoms, --O--, --SO.sub.2 --, --S--, or --CO--, m is 0 or 1 and n is 0 or 1; when p=0, q=r=an integer of 3 to 600; when q=r=0, p=an integer of 3 to 600; when p.noteq.0, q.noteq.0 and r.noteq.0, p+q+r=3 to 600; p, q, r are integers and q=r, which comprises using a horizontal jacketed reactor provided with one or two agitator shafts bearing impellers fixed thereto and carrying out the bulk polycondensation in said reactor while circulating a heat-transfer medium through the jacket, agitator shaft(s), and, if necessary, impellers to heat or cool the reaction system to obtain a particulate material having a weight-average particle size of 0.5 to 20 mm.

Bulk Polycondensation process for producing aromatic polyesters

In a method producing a polycondensate by bulk polycondensation of a monomer (or a reactant mixture) which is a fluid at the polycondensation temperature, an improvement which comprises carrying out the polycondensation until substantially the whole polycondensate becomes a solid polydispersion while continually applying a shearing force sufficient for maintaining the polycondensation system in polydispersed state at a temperature of below the sintering of the produced polycondensate but sufficiently high for allowing the polycondensation to proceed substantially.

Process for producing polycondensates

In a process for producing aromatic polyesters by bulk condensation of polyester forming reactant the improvement which comprises using three reaction vessels, reacting a reactant compound with an acid anhydride to effect an alkanolylation reaction in the first reaction vessel to thereby prepare a monomer, removing the acids by-produced in said reaction, forming or not forming an oligomer from a part or whole of said monomer, then transferring the reaction product of the first vessel into the second reaction vessel, polycondensing said monomer and/or oligomer to produce a prepolymer in the second reaction vessel, transferring the reaction product of the second vessel into the third reaction vessel, and heating said prepolymer in said third reaction vessel, thereby obtaining an aromatic polyester of high polymerization degree.

Process for producing aromatic polyesters

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Ibaraki, Japan

Haruo Suzuki