Method for producing decolored polyester, decolored polyester, and decoloring agent
AssigneesShintech Corporation, Jeplan, Inc.
InventorsMasaki Takao, Toru Sakai, Hiroshi Fujita, Shuji Inada
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Abstract
A method for producing a decolorized polyester according to the present invention includes: a step of preparing a polyester colored with a colorant, and a decolorizing agent containing a glycol ether-type compound having a boiling point at atmospheric pressure of 160° C. or higher; and a step of removing the colorant, by bringing the decolorizing agent into contact at least once with the colored polyester while heating the decolorizing agent to a temperature equal to or lower than a melting point of the polyester, to thereby obtain the decolorized polyester.
Claims11
A method for producing a decolorized polyester, comprising:
- a step of preparing a polyester colored with a colorant, and a decolorizing agent consisting of a glycol monoether having a boiling point at atmospheric pressure of 160° C. or higher;
- and
- a step of removing the colorant, by bringing the decolorizing agent into contact at least once with the colored polyester while heating the decolorizing agent to a temperature equal to or lower than a melting point of the polyester, to thereby obtain the decolorized polyester.
Dependencies are inferred from the claim text.