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US 2025/0129003 A1Published application
Monomer composition for synthesizing recycled plastic, preparation method thereof, recycled plastic, and molded product using the same
AssigneeLG Chem, Ltd.
InventorsJeongnam KIM, Jungmoon BAE, Ki Jae LEE, Jeongbin LEE, Jihwan HWANG, Mooho HONG
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Abstract
The present disclosure relates to a monomer composition for synthesizing recycled plastic that can realize excellent color quality even though it is recovered through recycling by chemical decomposition of a polycarbonate-based resin, and allows improvement of efficiency in the recovery process, a preparation method thereof, and a recycled plastic and a molded product using the same.
Claims20
A monomer composition for synthesizing recycled plastic, comprising:
- an aromatic diol compound,
- wherein a color coordinate b* of the monomer composition is 1.8 or less,
- wherein an APHA Color value of the monomer composition measured according to ASTM D 1209 is 30 or less, and
- wherein the monomer composition is a recovered product from a polycarbonate-based resin.
1 more element
A method for preparing a monomer composition for synthesizing recycled plastic, the method comprising the steps of:
- subjecting a polycarbonate-based resin to a depolymerization reaction;
- separating a carbonate precursor from a depolymerization reaction product;
- and
- purifying the depolymerization reaction product from which the carbonate precursor is separated,
- wherein the purifying step comprises:
- adding a hydrophilic reducing agent to the depolymerization reaction product from which the carbonate precursor is separated;
- and
- adding an adsorbent to the depolymerization reaction product from which the carbonate precursor is separated to perform adsorption purification, and then removing the adsorbent.
5 more elements
Dependencies are inferred from the claim text.