Invention Grant
- Patent Title: Continuous method and system for the production of at least one polymeric yarn and polymeric yarn
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Application No.: US15531653Application Date: 2015-12-02
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Publication No.: US11021811B2Publication Date: 2021-06-01
- Inventor: Marcos Roberto Paulino Bueno , Alessandro Bernardi , Harry Westfahl, Jr.
- Applicant: Braskem America, Inc.
- Applicant Address: US PA Philadelphia
- Assignee: Braskem America, Inc.
- Current Assignee: Braskem America, Inc.
- Current Assignee Address: US PA Philadelphia
- Agency: Duane Morris LLP
- International Application: PCT/US2015/063383 WO 20151202
- International Announcement: WO2016/089969 WO 20160609
- Main IPC: D01F6/04
- IPC: D01F6/04 ; D01D1/02 ; D01D5/06 ; D02J1/22 ; D01D10/06

Abstract:
The present invention provides a continuous method for the production of at least one polymeric yarn comprising the steps of: mixing a polymer with a first solvent generating a mixture; homogenizing the mixture; rendering the mixture inert; dosing the mixture to an extruder; immersing the mixture in a quenching bath (30), wherein an air gap is maintained before the mixture achieves the surface of the liquid of the quenching bath (30) forming at least one polymeric yarn; drawing at least once the at least one polymeric yarn; washing the polymeric yarn with a second solvent that is more volatile than the first solvent; heating the at least one polymeric yarn; drawing at room temperature, at least once, the at least one polymeric yarn; and heat drawing, at least once, the at least one polymeric yarn, wherein the mixture comprises: a polymer comprising ultra-high molecular weight polyethylene, comprising an intrinsic viscosity of from 5 dL/g to 40 dL/g, and a polydispersity index of from 2 to 10; and a first solvent capable of dissolving the polymer under the process conditions, and comprising a dynamic viscosity, measured at a temperature of 37.8° C., according to ASTM D-445, greater than 10 cP. The present invention further provides a continuous system for the production of at least one polymeric yarn, comprising: means for mixing the polymer with a first solvent generating a mixture; means for homogenizing the mixture; means for rendering the mixture inert; means for dosing the mixture to an extruder; means for immersing the mixture in a quenching bath (30), wherein an air gap is maintained before the mixture achieves the surface of the liquid of the quenching bath (30) forming at least one polymeric yarn; means for drawing at least once the at least one polymeric yarn; means for washing for washing the at least one polymeric yarn with a second solvent that is more volatile than the first solvent; means for heating the at least one polymeric yarn; means for drawing at room temperature at least once the at least one polymeric yarn; and means for heat drawing at least once the at least one polymeric yarn, wherein the mixture comprises: a polymer comprising ultra-high molecular weight polyethylene, comprising an intrinsic viscosity of from 5 dL/g to 40 dL/g, and a polydispersity index of from 2 to 10; and a first solvent capable of dissolving the polymer under the process conditions and comprising a dynamic viscosity, as measured at a temperature of 37.8° C. according to the ASTM standard D-445, greater than 10 cP. Further, the present invention provides a polymeric yarn made according to the above stated method.
Public/Granted literature
- US20180282904A1 CONTINUOUS METHOD AND SYSTEM FOR THE PRODUCTION OF AT LEAST ONE POLYMERIC YARN AND POLYMERIC YARN Public/Granted day:2018-10-04
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