Amorphous polyester chip and method for production thereof,...

Details Amorphous polyester chip and method for production thereof,... Amorphous polyester chip and method for production thereof,...

2004-06-30

2008-10-21

Nutter, Nathan M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S279000, C528S283000, C528S285000, C528S286000, C528S300000, C528S302000, C528S307000, C528S308000, C528S308600, C528S485000, C528S487000, C528S488000, C528S503000, C524S706000, C524S779000, C524S783000, C428S035700, C428S221000, C428S035900

Reexamination Certificate

active

07439317

ABSTRACT:
An amorphous polyester chip having superior processing ability is characterized by a moisture content of not more than 300 ppm and a fine particle content of not more than 500 ppm. A preferred embodiment is a copolymerized polyester chip comprising a main repeating unit consisting of ethylene terephthalate, and 1,4-dimethylene-cyclohexane terephthalate or neopentyl terephthalate, wherein the glycol component of the copolymerized polyester has a specific composition of 50 to 85 mol % of ethylene glycol, 12 to 45 mol % of 1,4-cyclohexanedimethanol or neopentyl glycol and 1.5 to 7.0 mol % of diethylene glycol. Such amorphous polyester chip can be obtained by cooling an amorphous polyester obtained by melt polymerization, cutting the polyester to give a chip, feeding the chip in a treatment tank, drying the chip and removing fine particles.

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patent: 2001-348425 (2001-12-01), None

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