Process for pellet formation from amorphous polyester
January 20, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3405098 3544525 Process for the continuous production of high molecular weight polyethylene terephthalate Solid state polymerization of polyester prepolymer Preparation of high molecular weight polyester Process for the continuous polymerization of polyethylene terephthalate in the solid phase Oligomer pellets of ethylene terephthalate Process for the production of polyester Process for pelletizing ultra high melt flow crystalline polymers and products therefrom Continuous process for the production of polyester for food packaging Patent #: 5362844 InventorsAssigneeApplicationNo. 375873 filed on 01/20/1995US Classes:264/13, By extrusion spraying or gravity fall through orifice264/5, FORMATION OF SOLID PARTICULATE MATERIAL DIRECTLY FROM MOLTEN OR LIQUID MASS (E.G., LIQUID COMMINUTING)264/345, By a temperature change528/308.2Physically after-treated solid polymerExaminersPrimary: Theisen, Mary LynnAttorney, Agent or FirmInternational ClassesC08G 063/18B29C 035/02 AbstractThe present invention relates to a process for forming robust, uniform, low molecular weight crystalline polyester particles. Such particles are useful for forming higher molecular weight polyesters, for example, by solid-state polymerization. Either conventionally-formed, essentially amorphous, non-molten polyester pellets at ambient temperatures or, alternatively, essentially amorphous molten polyester droplets, can be crystallized by rapidly subjecting the droplets or pellets to a thermal shock according to the process of the present invention.Field of SearchBy a temperature changeTo cool FORMATION OF SOLID PARTICULATE MATERIAL DIRECTLY FROM MOLTEN OR LIQUID MASS (E.G., LIQUID COMMINUTING) By extrusion spraying or gravity fall through orifice To anneal or temper To complete vulcanization or polymerization Physically after-treated solid polymer | |
