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    PRODUCTION OF RECYCLED POLYESTERS FROM POLYESTER WASTE THROUGH CHEMICAL RECYCLING METHODOLOGY
    2.
    发明公开
    PRODUCTION OF RECYCLED POLYESTERS FROM POLYESTER WASTE THROUGH CHEMICAL RECYCLING METHODOLOGY 审中-公开

    公开(公告)号：US20240287248A1

    公开(公告)日：2024-08-29

    申请号：US18582303

    申请日：2024-02-20

    申请人： PLASTA REI S.R.L.

    发明人： Giuseppe ABBRUZZESI ,  Fabio MAZZARELLA ,  Luca BORGOMEO ,  Francesco BORGOMEO

    IPC分类号： C08G63/80 ,  C08G63/06

    CPC分类号： C08G63/80 ,  C08G63/06

    摘要： A method prepares polymeric material including polyester recycled by chemical recycling technology by glycolysis from waste, purification and subsequent repolymerization, to obtain a purified product with chemical-physical-mechanical features equal to virgin plastic material. The method includes providing raw material in the form of flakes for a glycolysis process obtained through a pre-treatment process of dirty post-consumer plastic of polyesters. Chemical depolymerization reacts by glycolysis to obtain a mixture defined “glycolysis product” based on the intermediate Bis-2-hydroxyethyl terephthalate and low-molecular-weight small oligomers. Purification of the glycolysis product uses ion exchange resins and adsorbents for removing contaminants and color and subsequent recovery of pigments separated from the plastic and subsequent evaporation and concentration reactions to obtain the pure BHET monomer, intermediate of PET production. Polycondensation reaction of the pure intermediate monomer obtains polyester and subsequent granulation aimed at solid phase crystallization. A pilot plant and an industrial plant perform the method.

    POLYMER COMPRISING LONG CHAIN HYDROXY ACIDS
    5.
    发明公开
    POLYMER COMPRISING LONG CHAIN HYDROXY ACIDS 审中-公开

    公开(公告)号：US20240182632A1

    公开(公告)日：2024-06-06

    申请号：US18556282

    申请日：2022-04-11

    申请人： EVONIK OPERATIONS GMBH

    发明人： Tim SMOLNIK ,  Erik KERSTEN ,  Rolf SCHNEIDER

    IPC分类号： C08G63/06 ,  C08G63/85 ,  C08G63/87 ,  C08J5/18

    CPC分类号： C08G63/06 ,  C08G63/85 ,  C08G63/87 ,  C08J5/18 ,  C08J2367/04

    摘要： A process for preparing a polymer from a 3-hydroxy carboxylic acid as monomer comprising at least 8 carbon atoms where the polymerisation reaction is conducted at a temperature of from 100° C. to 180° C. while removing water from the reaction mixture, wherein 50 to 100 mol-% of the monomers used are 3-hydroxy carboxylic acids comprising at least 8 carbon atoms. A polymer comprising units based on 3-hydroxy carboxylic acid, comprising at least 8 carbon atoms, characterized in that of from 60 to 100 mol-% of the units are based on beta-hydroxy carboxylic acids, comprising at least 8 carbon atoms and films, foils, flexible packaging, and barrier coatings comprised of said polymers.

    ALL-PURPOSE POLY(3-HYDROXYBUTYRATE) BY STEREOMICROSTRUCTURAL ENGINEERING
    6.
    发明公开
    ALL-PURPOSE POLY(3-HYDROXYBUTYRATE) BY STEREOMICROSTRUCTURAL ENGINEERING 审中-公开

    公开(公告)号：US20240158567A1

    公开(公告)日：2024-05-16

    申请号：US18492554

    申请日：2023-10-23

    申请人： COLORADO STATE UNIVERSITY RESEARCH FOUNDATION

    发明人： Eugene CHEN ,  Ethan QUINN ,  Zhen ZHANG

    IPC分类号： C08G63/06 ,  C08L67/04 ,  C09J167/04

    CPC分类号： C08G63/06 ,  C08L67/04 ,  C09J167/04 ,  C08L2205/025

    摘要： Syndio-rich P3HB (sr-P3HB), readily synthesized from the eight-membered meso-dimethyl diolide, has a unique set of stereomicrostructures comprising enriched syndiotactic [rr] and no isotactic [mm] triads but abundant stereo-defects randomly distributed along the chain. This sr-P3HB material is characterized by high toughness (UT=96 MJ/m3), as a result of its high elongation at break (>400%) and tensile strength (34 MPa), crystallinity (Tm=114° C.), and optical clarity (due to its sub-micron spherulites), and good barrier properties, while it still biodegrades in freshwater and soil. On the other hand, iso-rich P3HB (ir-P3HB) can be synthesized from the eight-membered rac-dimethyl diolide. While sr-P3HB exhibits excellent adhesion strength toward a variety of substrates, both sr-P3HB and ir-P3HB can substantially toughen brittle stereoperfect biological or synthetic P3HB. Both sr-P3HB and ir-P3HB can also be obtained from the four-membered rac-beta-butyrolactone with appropriate catalysts.