METHOD FOR PRODUCING POLYESTER POLYOL
    1.
    发明公开

    公开(公告)号:US20240124643A1

    公开(公告)日:2024-04-18

    申请号:US18071807

    申请日:2022-11-30

    摘要: A method for producing a polyester polyol is provided, which includes: feeding a first antioxidant and a raw material reactant that includes a polyacid and a polyol into a reactor; subjecting the polyacid and the polyol to an esterification reaction to form an oligomer; and performing a prepolymerization reaction on the oligomer to obtain a prepolymerization reactant. During the prepolymerization reaction, the method includes sampling and monitoring an acid value of the prepolymerization reactant. When the acid value of the prepolymerization reactant reaches a first acid value, an esterification reaction catalyst is added to the prepolymerization reactant for carrying out a polycondensation reaction and generating a polycondensation reactant that contains the polyester polyol. During the polycondensation reaction, the method includes sampling and monitoring an acid value of the polycondensation reactant. When the acid value of the polycondensation reactant reaches a second acid value, the polycondensation reaction is terminated.

    POLYURETHANE HOT MELT ADHESIVE
    2.
    发明申请

    公开(公告)号:US20230127766A1

    公开(公告)日:2023-04-27

    申请号:US17873337

    申请日:2022-07-26

    IPC分类号: C09J175/04

    摘要: A polyurethane hot melt adhesive is provided. The polyurethane hot melt adhesive is formed by reacting an isocyanate component, a polyol component, and a chain extender component. The polyol component includes a first polyol and a second polyol, a number-average molecular weight of the first polyol is within a range from 650 to 1,500, and a number-average molecular weight of the second polyol is within a range from 1,500 to 3,000. The chain extender component includes a first chain extender and a second chain extender, and the second chain extender is a diyol having an ether group or a hydrocarbyl. A ratio between a weight percentage of the first chain extender and a weight percentage of the second chain extender is within a range from 9:1 to 4:1. A forming temperature of the polyurethane hot melt adhesive is within a range from 100° C. to 150° C.

    USE OF LOW SPECIFIC GRAVITY PET COMPOSITE MATERIAL

    公开(公告)号:US20200239683A1

    公开(公告)日:2020-07-30

    申请号:US16679420

    申请日:2019-11-11

    IPC分类号: C08L67/02

    摘要: A use of a low specific gravity PET composite material that is suitable for manufacturing a tableware article by injection molding is provided. The tableware article provides a balance between aesthetic appearance and food safety and can be used in place of melamine tableware. The low specific gravity PET composite material includes 66.5-96.3 wt % of PET, 0-20 wt % of PBT, 3-10 wt % of an inorganic filler, 0.1-0.5 wt % of an antioxidant, 0.1-1 wt % of a processing aid, and 0.5-2 wt % of a nucleating agent, and the total amount of all components is 100 wt %.

    MANUFACTURING METHOD AND MOLDED ARTICLE OF HEAT-RESISTANT TABLEWARE

    公开(公告)号:US20240117155A1

    公开(公告)日:2024-04-11

    申请号:US18071569

    申请日:2022-11-29

    摘要: A manufacturing method of a heat-resistant tableware and a molded article of the heat-resistant tableware are provided. The manufacturing method of the heat-resistant tableware includes: providing a polyester composite material that includes 50 wt % to 85 wt % of polyethylene terephthalate, 0 wt % to 5 wt % of an organic nucleating agent, and 10 wt % to 30 wt % of an inorganic nucleating agent; and injecting the polyester composite material into a mold in an injection molding process, in which a mold temperature of the mold is controlled to be not less than 110° C., and a crystallinity of the polyester composite material in the mold is controlled to be between 20% and 30%, so that the polyester composite material is formed into the molded article of the heat-resistant tableware in the mold, and the molded article has a heat distortion temperature of not less than 150° C.

    THERMOPLASTIC POLYURETHANE RESIN SUITABLE FOR MELT SPINNING

    公开(公告)号:US20230121054A1

    公开(公告)日:2023-04-20

    申请号:US17885517

    申请日:2022-08-10

    IPC分类号: C08L75/06 C08G18/42 D01D5/08

    摘要: A thermoplastic polyurethane resin suitable for melt spinning is formed from a reaction mixture via a polymerization reaction. The reaction mixture includes an isocyanate component and a polyol component. The polyol component includes a first polyol that has a first number average molecular weight and a second polyol that has a second number average molecular weight. The first number average molecular weight is between 1,000 g/mol and 1,500 g/mol, and the second number average molecular weight is between 2,500 g/mol and 3,000 g/mol. One resin component formed by the first polyol via the polymerization reaction is defined as a low melting point segment and correspondingly has a first melting point between 170° C. and 185° C. Another resin component formed by the second polyol via the polymerization reaction is defined as a high melting point segment and correspondingly has a second melting point between 195° C. and 210° C.

    INJECTION MOLDING GRADE PVC TUBE AND METHOD FOR PRODUCING THE SAME

    公开(公告)号:US20240263000A1

    公开(公告)日:2024-08-08

    申请号:US18317912

    申请日:2023-05-15

    IPC分类号: C08L27/06

    CPC分类号: C08L27/06 C08L2205/03

    摘要: An injection molding grade PVC tube and a method for producing the same are provided. The injection molding grade PVC tube includes 100 parts by weight of a PVC resin, 2 to 8 parts by weight of a heat stabilizer, 1 to 20 parts by weight of a first additive, and 0.7 to 15 parts by weight of a second additive. The first additive includes a processing modifier and a heat resistance enhancer, and a weight ratio between the processing modifier and the heat resistance enhancer is within a range from 1:6.67 to 1:10. The PVC resin, the heat stabilizer, the first additive, and the second additive are powder-shaped. The injection molding grade PVC tube is formed by direct injection molding after hot melt extrusion of the PVC resin, the heat stabilizer, the first additive, and the second additive.