Aromatic polycarbonate oligomer solid

Abstract

The purpose of the present invention is to provide an aromatic polycarbonate oligomer solid with substantially reduced low-molecular-weight components, no or a substantially reduced amount of chlorine-containing compounds, high loose bulk density, and ease of handling. The aromatic polycarbonate oligomer solid contains a repeating unit represented by formula (1), has a weight average molecular weight of 500-10,000, low-molecular-weight components less than or equal to 5.0 area% measured with high-speed liquid chromatography, and a loose bulk density of greater than or equal to 0.22 g / cm3.

Description

technical field [0001] The present invention relates to an aromatic polycarbonate oligomer solid, in particular, relates to an aromatic polycarbonate oligomer using 1,1-bis(4-hydroxyphenyl)cyclododecane and a carbonate precursor as raw materials Polymer solids. Background technique [0002] Polycarbonate oligomers are widely used as intermediate raw materials for the manufacture of high molecular weight polycarbonates by interfacial polymerization, raw materials for the manufacture of high molecular weight polycarbonates by melt polymerization or solid state polymerization, and as surface modifiers, Polymer modifiers such as flame retardants, ultraviolet absorbers, fluidity modifiers, plasticizers, compatibilizers for resin alloys, etc. In recent years, the performances required 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. A...

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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