METHOD FOR MANUFACTURING POLYBUTYLENE TEREPHTHALATE PELLET

• Main Authors: SUZUKI TAKAYUKI, NAKAGAWA SATORU, MATSUZONO SHINICHIRO
• Format: Patent
• Language: English
• Published: 05.12.2013
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for manufacturing a polybutylene terephthalate pellet capable of reducing a generation amount of fine powder at pelletizing polybutylene terephthalate having a low polymerization degree.SOLUTION: In a method of manufacturing polybutylene terephthalate pellet, molten polybutylene terephthalate is discharged in a strand shape through an esterification reaction of a dicarboxylic acid component based on terephthalic acid or an ester forming derivative thereof with diol based on 1,4-butanediol and/or an esterification process for performing an ester exchange reaction and a polycondensation process for performing the polycondensation reaction of the oligomer obtained by the esterification process, and after the strand is solidified, it is cut to manufacture the pellet. In this case, the molten polybutylene terephthalate with a polymerization degree of 20-60 is solidified by cooling water of 20-60°C.