Patent ID: 7439317
Filing Date: 2008-10-21
Classification: C08J,Y10T

Abstract:
1. An amorphous polyester chip having a moisture content of 300 ppm or less, which comprises fine particles of amorphous polyester in a content of 500 ppm or less with respect to the mass of the amorphous polyester chip and particles, which is a copolymerized polyester chip obtained by copolymerization of polyethylene terephthalate with a dicarboxylic acid component other than terephthalic acid and/or a glycol component other than ethylene glycol, and which does not show a melting point (peak), wherein the dicarboxylic acid component is selected from the group consisting of isophthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyl-4-4′-dicarboxylic acid, diphenoxyethanedicarboxylic acid, p-oxybenzoic acid, oxycaproic acid, adipic acid, sebacic acid, succinic acid, glutaric acid and 1,4-cyclohexanedicarboxylic acid, and wherein the amount of terephthalic acid component in the entire dicarboxylic acid component is not less than 70 mol %; wherein the glycol component is selected from the group consisting of diethylene glycol, trimethylene glycol, tetramethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, bisphenol A and alkylene oxide adduct of bisphenol A, and wherein the amount of ethylene glycol component in the entire glycol component is not less than 50 mol % and not more than 88 mol %; wherein a melting point (peak) is a clear melting peak in two temperature-raising processes including raising at a rate of 20° C./min from −100° C. to 300° C., followed by immediate cooling with liquid nitrogen, and raising again at a rate of 20° C./min from −100° C. to 300° C., using a differential scanning calorimeter; and wherein a fine particle means a particle contained in said polyester chip, which is measured according to JIS-Z8801 as a particle that passes through a stainless net sieve of nominal size 1.7 mm, wire diameter 0.8 mm, and that does not pass through a glass filter having a pore size of 100 to 120 μm.