TH25813A - Aromatic production method Polycarbonate - Google Patents

Abstract

What is revealed is a method for producing aromatic polycarbonate, which involves introducing into the polymerizer at least one polymerizable material chosen from a melt monomer mixture of aromatic dihydroxy and diaryl carbonate compounds and a melt prepolymer obtained from the mixture as a monomer, in which the liquid mass of the polymerizable material is transesterified in the polymerizer and has an open surface, and in which the transesterification reaction of the liquid mass of the polymerizable material is carried out under reaction conditions according to the following formula (1): log (S/V) ≥ 2 x 10⁻⁵ x - Mn + 0.8 (1), where S represents the evaporation surface area (m²), which is defined as the area (m²) of the open surface of the liquid mass of the polymerizable material, and V represents the volume (m³) of the liquid mass of the polymerizable material. In polymerizers, Mn represents the average molecular weight of the produced aromatic polycarbonate. For comparison with existing methods, this approach offers commercial advantages. Not only can it produce high-quality aromatic polycarbonate with high heat resistance at high polymerization rates without peeling, impurities, or thermal degradation, but it also requires minimal stirring force and allows for easy and scalable polycarbonate production.

Claims (5)

1. In a method for aromatic production Polycarbonate which contains conductivity Into the transesterification reaction In the polymerizer with at least one of the materials. That can be polymerized That were selected from the group that consisted of Fused monomer mixtures of aromatic, dihydroxy and diaryl carbonate compounds and fused pre-polymers obtained by a process consisting of a reaction agent. Aromatic dihydroxy and diaryl carbonate are assembled. Where the polymerized material is It exists as a liquid mass in a polymerizer and where the liquid mass of a material that can be polymerized. Trans-esther The fire in the polymer has a thick skin that opens. The modifications which carry out such trans-esterification of The liquid mass of such polymerized material. Is to act under the conditions of The reaction in such a way that it corresponds to the following formula (1) log (S / V) greater than or equal to 2 x 10-5 x Mn + 0.8 (1) where S represents the evaporation surface area (m 2), where Is defined as the area (m 2) of the exposed area (exposures) of the liquid mass of such polymerized material, V represents the volume (m 3) of the liquid mass of the polymeric material. The merization is obtained in the polymerizer and Mn represents the average molecular weight of aromatic numbers. Produced polycarbonate 2. Method according to claim 1, where the trans-esterification reaction of The liquid mass of the polymerized material. Was processed as a wet fall substance so that The liquid mass of the polymerized material. Will be made to fall along and come into contact with the surface of A solid object selected from a group consisting of the inner wall of the polymerizer and a guide that is defined in the polymerizer. 3. Clause 1 or 2 method where the volume V (m 3) of the liquid mass of the polymerized material is 5% or more with respect to the internal volume of the Such polymers 4. The only one claim 1 or 2 method in which the evaporated surface area S (m 2) of the liquid mass of the polymerized material is consistent with the formula ( 2) Here, S is greater than or equal to 0.03 O (2), where Q represents the rate (kg / hr) at which this rate can produce aromatic polycarbonate. 5. Method according to claim 4, where the rate Q (kg / hr), which can produce aromatic polycarbonate is 1 kg / hr or more.