Aromatic polycarbonate oligomer solid

Abstract

The object of the present invention is to provide a solid aromatic polycarbonate oligomer that has significantly reduced low molecular weight components, is free of chlorine-containing compounds or has been significantly reduced, and has a high bulk density (Losse bulk density) and is easy to handle. By containing the repeating unit represented by the following formula (1), the weight average molecular weight is 500 to 10000, the low molecular weight component is 5.0 area% or less in the measurement carried out by high performance liquid chromatography, and the loose bulk density is 0.22g / cm 3 The above solid aromatic polycarbonate oligomer can solve the above-mentioned problems.

Description

technical field [0001] The present invention relates to an aromatic polycarbonate oligomer solid, and more specifically, to an aromatic polycarbonate oligomer using 1,1-bis(4-hydroxyphenyl)cyclododecane and a carbonate precursor as raw materials Aggregate solids. Background technique [0002] Polycarbonate oligomers are widely used as intermediate raw materials in the production of high molecular weight polycarbonates by interfacial polymerization, raw materials in the production of high molecular weight polycarbonates by melt polymerization or solid phase polymerization, as well as surface modifiers, Flame retardants, UV absorbers, fluidity modifiers, plasticizers, compatibilizers for resin alloys and other polymer modifiers. In recent years, the required properties of polycarbonate oligomers have become increasingly diverse and severe, and further improvements have been sought for polycarbonate oligomers other than bisphenol A-based polycarbonate oligomers. Among them, f...

AI Technical Summary

Problems solved by technology

However, in this interfacial polymerization method, there are problems in that toxic phosgene must be used, corrosion of equipment due to by-produced hydrogen chloride and sodium chloride, and chlorine-containing compounds such as dichloromethane used in large quantities as solvents, and difficulty in separation Impurities such as sodium chloride or residual dichloromethane that adversely affect the physical properties of the polymer

[0011] However, as in the case of the above-mentioned oligomers, since precipitation is performed using a dichloromethane solution on the basis of the interfacial polymerization method, chlorine-containing compounds such as dichloromethane remaining in the polycarbonate cannot be completely removed, so as mentioned above There are concerns about corrosion of equipment or deterioration of polymer properties due to residual chlorine-containing compounds

[0012] Furthermore, since only the solvent in the polymerization reaction solution is removed and everything else is solidified directly, there is no purification effect, and low molecular weight components generated during the reaction remain, so the storage stability is poor as described above, and the quality such as coloring is lowered. concerns

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