Patent ID: 8383759
Filing Date: 2013-02-26
Classification: C08G

Abstract:
1. A method for producing a liquid crystal polyester, which includes the following steps of: (1) polycondensing a mixture of 65 to 80 mol % of a compound represented by the following formula (I) with 20 to 35 mol % of a compound represented by the following formula (II) (the total of both compounds is 100 mol %) in a polymerization tank at 260 to 350° C. to form a prepolymer while distilled off by-products to be formed, wherein (1-1) the by-products contain a compound in which R (2) continuously discharging the prepolymer from the polymerization tank in a molten state, solidifying the prepolymer while successively transferring in one direction, and continuously grinding the solidified prepolymer by a grinder provided at the downstream in a transfer direction to produce prepolymer particles; and (3) heat-treating the prepolymer particles in their solid state under an inert gas atmosphere, thereby subjecting them to solid phase polymerization: wherein R wherein R