Patent ID: 8388879
Filing Date: 2013-03-05
Classification: C08G,C08K,D01D,D01F,Y10T

Abstract:
1. A method of preparing a flame retardant polyester fiber comprising the steps of: i) preparing flame retardant polyester chips by polymerizing a composition including a primary ester compound obtained by esterification of a dicarboxylic acid compound and a diol compound, and a phosphorous-based flame retardant represented by the following Chemical Formula 1; ii) pre-crystallizing the surface of the flame retardant polyester chips by rubbing the flame retardant polyester chips on each other so that the crystallinity of the flame retardant polyester chips is from 0.1% to 5%; iii) solid state polymerizing the pre-crystallized polyester chips; and iv) melting and spinning the solid state polymerized polyester chips, wherein R R