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US 2023/0391702 A1Published application
Monomer composition for synthesizing recycled plastic, preparation method thereof, recycled plastic, and molded product using the same
AssigneeLG Chem, Ltd.
InventorsEunju PARK, Ki Jae LEE, Jungmoon BAE, Jeongbin LEE, Joong Jin HAN, Mooho HONG
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Abstract
The present disclosure relates to a monomer composition for synthesizing recycled plastic that contains a high-purity aromatic diol compound recovered through recycling by chemical decomposition of a polycarbonate-based resin, a method for preparing the same, and a recycled plastic and molded product using the same.
Claims18
A monomer composition for synthesizing recycled plastic, comprising:
- an aromatic diol compound,
- wherein the monomer composition has a color coordinate L* of 94 or more, and a color coordinate b* of 0 to 4.2, and
- wherein the monomer composition is a recovered product from a polycarbonate-based resin.
A method for preparing a monomer composition for synthesizing recycled plastic, the method comprising the steps of:
- depolymerizing a polycarbonate-based resin;
- adding a first adsorbent to a depolymerization reaction product to perform an adsorption purification and then removing the first adsorbent;
- separating a carbonate precursor from the depolymerization reaction product;
- and
- purifying the depolymerization reaction product from which the carbonate precursor has been separated,
- wherein the purifying step comprises:
- a step of adding a second adsorbent to the depolymerization reaction product from which the carbonate precursor has been separated to perform an adsorption purification and then removing the second adsorbent.
4 more elements
Dependencies are inferred from the claim text.