公开(公告)号：US20250066541A1

公开(公告)日：2025-02-27

申请号：US18944399

申请日：2024-11-12

Applicant: SHPP GLOBAL TECHNOLOGIES B.V.

Inventor： Peter VOLLENBERG ,  Kaushal GANDHI ,  Lohith KENCHAIAH ,  Gaurav MEDIRATTA

IPC: C08G63/183 ,  C08K3/22 ,  C08K3/30 ,  C08L67/02

Abstract: Methods for forming a thermoplastic composition include: polymerizing a high purity bis(2-hydroxyethyl) terephthalate (BHET) monomer with butane diol (BDO) to form polybutylene terephthalate (PBT); and combining from 15 wt % to 98 wt % of the PBT, from 2 wt % to 10 wt % of at least one brightening agent, and from 0 wt % to 83 wt % of at least one additional component, to form the thermoplastic composition. The high purity BHET monomer is formed by a process consisting of depolymerizing post-consumer or post-industrial recycled (PCR) polyethylene terephthalate (PET), the high purity BHET monomer has a purity of at least 95%, and the thermoplastic composition has an L* color value of at least 94.

公开(公告)号：US20240417356A1

公开(公告)日：2024-12-19

申请号：US18708288

申请日：2022-11-07

Applicant: SHPP GLOBAL TECHNOLOGIES B.V.

Inventor： Lohith KENCHAIAH ,  Vinod KONAGHATTA NARAYANACHAR ,  Ranjan Kumar DASH ,  Hariharan RAMALINGAM ,  Guarav MEDIRATTA

IPC: C07C51/09

Abstract: A method of converting poly(ethylene terephthalate) to terephthalic acid includes a glycolysis step in which poly(ethylene terephthalate) is reacted with ethylene glycol in the presence of zinc acetate catalyst, a hydrolysis step in which the product of the glycolysis step is reacted with an alkali metal hydroxide to produce an alkali metal salt of terephthalic acid, and an acidification step in which the product of the hydrolysis step is acidified to yield a precipitate containing terephthalic acid. Each step of the method can be conducted at ambient or near-ambient pressure, and the method produces terephthalic acid in high yield and high purity.

公开(公告)号：US20220056202A1

公开(公告)日：2022-02-24

申请号：US17421190

申请日：2020-01-10

Applicant: SHPP GLOBAL TECHNOLOGIES B.V.

Inventor： Peter VOLLENBERG ,  Kaushal GANDHI ,  Lohith KENCHAIAH ,  Gaurav MEDIRATTA

IPC: C08G63/183 ,  C08L67/02 ,  C08K3/22 ,  C08K3/30

Abstract: Thermoplastic compositions include from about 15 wt % to about 98 wt % of a polybutylene terephthalate (PBT) component, from about 2 wt % to about 10 wt % of at least one brightening agent and from 0 wt % to about 83 wt % of at least one additional component. The PBT component includes PBT derived from post-consumer or post-industrial recycled (PCR) polyethylene terephthalate (PET). In particular, the PBT may be derived from the PCR PET by first depolymerizing the PCR PET to form a high purity bis(2-hydroxyethyl) terephthalate (BHET) monomer (e.g., greater than 95% purity), and then polymerizing the high purity BHET monomer with butane diol (BDO) to form the PBT. The thermoplastic compositions have an L* color value of at least about 94.