Invention Application
- Patent Title: METHODS FOR LOWERING MELT VISCOSITY AND IMPROVING HEAT-SEALABILITY OF POLYESTER AND FOR MANUFACTURING A HEAT-SEALED CONTAINER OR PACKAGE
- Patent Title (中): 降低熔体粘度的方法，提高聚酯的热密封性和制造热封容器或包装
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Application No.: PCT/IB2015/050488Application Date: 2015-01-22
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Publication No.: WO2015110980A1Publication Date: 2015-07-30
- Inventor: NEVALAINEN, Kimmo , RIBU, Ville , RÄSÄNEN, Jari , KYLLIÄINEN, Outi , ROSLING, Ari , KHAJEHEIAN, Mohammad , KUUSIPALO, Jurkka , KOTKAMO, Sami , TOUMINEN, Mikko
- Applicant: STORA ENSO OYJ
- Applicant Address: P.O 309 FI-00101 Helsinki FI
- Assignee: STORA ENSO OYJ
- Current Assignee: STORA ENSO OYJ
- Current Assignee Address: P.O 309 FI-00101 Helsinki FI
- Agency: MAGNUSSON, Ulf
- Priority: SE1400034-3 20140124
- Main IPC: C08J7/18
- IPC: C08J7/18 ; B29C35/08 ; B29C71/04 ; B32B27/10 ; B65D65/38
Abstract:
The invention relates to methods for lowering the melt viscosity and thereby improving heat-sealability of a polyester. The invention also relates to a method for manufacturing a heat-sealed container or package from fibrous- based, polyester-coated packaging material, and a method for heat-sealing polyester. The solution according to the invention is subjecting polyester to electron beam (EB) radiation. The lowered melt viscosity allows a lower heat- sealing temperature, and permits sealing of polyester to an uncoated fibrous surface. The preferred polyester for the invention is polylactide, as such or as blended with another polyester.
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