公开(公告)号：US20250066546A1

公开(公告)日：2025-02-27

申请号：US18724373

申请日：2022-12-20

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Keshavaraja Alive ,  Mark Erik Nelson

IPC: C08G63/91 ,  B29C48/00 ,  B29K267/00 ,  C08G63/183

Abstract: In an aspect, a method for reducing the molecular weight of a polyester, comprises mixing a composition comprising a polyester oligomer and a polyester in a molten state to form a modified polyester; wherein the mixing occurs at a temperature of 230 to 330° C.; wherein the polyester oligomer is present in an amount of 0.1 to 50 weight percent based on 5 the total weight of the composition; wherein the polyester comprises a C2-12 alkyl phthalate polyester having a weight average molecular weight, Mwi, of 15,000 to 100,000 g/mol determined using gel permeation chromatography based on polystyrene standards; and wherein the modified polyester has a weight average molecular weight, Mwf, of at least 5% less than the weight average molecular weight of the polyester.

公开(公告)号：US20190338071A1

公开(公告)日：2019-11-07

申请号：US16474616

申请日：2017-12-06

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Prashant Kumar ,  Husnu Alp Alidedeoglu ,  Keshavaraja Alive

IPC: C08G63/181 ,  C08G63/82 ,  B01J21/06

Abstract: The present invention relates to a process for the production of a thermoplastic polyester using a reaction mixture comprising a dicarboxylic acid having a melting temperature of ≥200° C. wherein the dicarboxylic acid is introduced to the process in the form of particles having an average particle diameter of ≥100 μm. Such process results in a reduction of the polymerisation time. Furthermore, it allows for the production of thermoplastic polyesters having a desired balance of intrinsic viscosity and carboxylic end group content at a reduced polymerisation time.

公开(公告)号：US20250059322A1

公开(公告)日：2025-02-20

申请号：US18724356

申请日：2022-12-19

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Keshavaraja Alive ,  Robert Russell Gallucci

IPC: C08G63/78 ,  C08G63/183 ,  C08J3/12 ,  C08J3/20 ,  C08K5/053

Abstract: In an aspect, a method for reducing the molecular weight of a polyester comprises extruding a composition comprising a chain scission agent and a polyester in a molten state to form a modified polyester. The chain scission agent can comprise a C2-12 diol and can be present in an amount of 0.1 to 5 weight percent based on the total weight of the composition. The polyester can comprise a C2-12 alkyl phthalate polyester having a weight average molecular weight, Mwi, of 15,000 to 100,000 g/mol based on polystyrene standards. The modified polyester can have a weight average molecular weight, Mwf, of at least 5% less than the weight average molecular weight of the polyester.

公开(公告)号：US11021570B2

公开(公告)日：2021-06-01

申请号：US16474616

申请日：2017-12-06

Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

Inventor： Prashant Kumar ,  Husnu Alp Alidedeoglu ,  Keshavaraja Alive

IPC: C08G63/181 ,  B01J21/06 ,  C08G63/82

Abstract: The present invention relates to a process for the production of a thermoplastic polyester using a reaction mixture comprising a dicarboxylic acid having a melting temperature of ≥200° C. wherein the dicarboxylic acid is introduced to the process in the form of particles having an average particle diameter of ≥100 μm. Such process results in a reduction of the polymerisation time. Furthermore, it allows for the production of thermoplastic polyesters having a desired balance of intrinsic viscosity and carboxylic end group content at a reduced polymerisation time.