Method for Depolymerising Oxygenated Polymer Materials
US-2017349613-A1 · Dec 7, 2017 · US
Sustainable polyester from recycled polyethylene terephthalate
US12570827B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12570827-B2 |
| Application number | US-202117924487-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 11, 2021 |
| Priority date | May 11, 2020 |
| Publication date | Mar 10, 2026 |
| Grant date | Mar 10, 2026 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
A method includes depolymerizing post-consumer or post-industrial recycled polyethylene terephthalate (rPET) to form bis(2-hydroxyethyl) terephthalate (BHET), and reacting at least a portion of the BHET with a catalyst to form an alcohol. The alcohol includes cyclohexanedimethanol (CHDM) or 1,4-phenylenedimethanol (PDM). Further steps of the method include polymerizing the alcohol in the presence of additional BHET to form a polyester. The polyester may include poly(cyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate glycol (PETG) copolyester, polycyclohexylene dimethylene terephthalate glycol (PCTG) copolyester, polycyclohexylene dimethylene terephthalate acid (PCTA), or a monomer having repeating units with the structure (I), wherein n is an integer having a value of at least 20.
First claim
Opening claim text (preview).
What is claimed is: 1 . A method comprising: a. depolymerizing post-consumer or post-industrial recycled polyethylene terephthalate (PET) to form bis(2-hydroxyethyl) terephthalate (BHET); b. reacting at least a portion of the BHET with lithium aluminum hydride (LiAlH 4 ) to form 1,4-phenylenedimethanol (PDM); and c. polymerizing the PDM in the presence of additional BHET to form a polyester comprising a monomer having repeating units with the structure wherein n is an integer having a value of at least 20. 2 . The method according to claim 1 , wherein the polyester comprises at least 80 wt % carbon derived from the rPET.
Assignees
Inventors
Classifications
Recycled plastic · CPC title
Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title
Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title
Boron, aluminium, gallium, indium, thallium, rare-earth metals, or compounds thereof {(C08G63/823 takes precedence)} · CPC title
Alkali metals, alkaline earth metals, beryllium, magnesium, copper, silver, gold, zinc, cadmium, mercury, manganese, or compounds thereof {(C08G63/823 takes precedence)} · CPC title
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- What does patent US12570827B2 cover?
- A method includes depolymerizing post-consumer or post-industrial recycled polyethylene terephthalate (rPET) to form bis(2-hydroxyethyl) terephthalate (BHET), and reacting at least a portion of the BHET with a catalyst to form an alcohol. The alcohol includes cyclohexanedimethanol (CHDM) or 1,4-phenylenedimethanol (PDM). Further steps of the method include polymerizing the alcohol in the presen…
- Who is the assignee on this patent?
- Shpp Global Tech Bv
- What technology area does this patent fall under?
- Primary CPC classification C08G63/183. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 10 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).