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AssigneeToray Industries, Inc.
InventorsHirokazu Komatsu, Daisuke Matsumi, Takayuki Yoshimiya
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Provided are: a polyester composition which balances structural stability with dyeability of disperse dyes at less than 100° C. when made into fibers; and a method for producing said polyester composition. This polyester composition having dyeability at atmospheric pressure: contains components comprising dicarboxylic acid, a diol and polyethylene glycol, with the main repeating components comprising ethylene terephthalate; and is characterized in that 5-10 mol % of the total diol component has three carbon chains with side chains, the content of polyethylene glycol in the polyester composition is 2-4 wt %, and the content of cyclic dimers is not more than 0.35 wt %.
A polyester composition dyeable with a disperse dye at atmospheric pressure which comprises a polyester containing a dicarboxylic acid, diol and polyethylene glycol and composed mainly of ethylene terephthalate as main repeating component;
A production method for a polyester composition dyeable with a disperse dye at atmospheric pressure comprising a step for producing a polyester by condensation polymerization of a dicarboxylic acid or an ester-forming derivative thereof and a diol or an ester-forming derivative thereof in the presence of a condensation polymerization catalyst, characterized in that the diol component containing three carbon chains and having a side chain is added prior to the commencement of the ester reaction so as to account for 5 to 10 mol % of the total diol quantity in the polyester and that the polyethylene glycol is added so as to account for 2 to 4 wt % of the polyester composition.
Dependencies are inferred from the claim text.