Directly attaching, halogen-free, fast-drying, heat-sealing binder for sealing polyester films to polystyrene, polyester or PVC

US10385244B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Andre Hennig · Ingelheim am Rhein, DE
• Thomas Arnold · Winslow, US
• Michael Wicke · Seeheim-Jugenheim, DE
• Juergen Hartmann · Ludwigshafen, DE
• Bruno Keller · Zürich, CH
• Guenter Schmitt · Darmstadt, DE
• Michael Waldhaus · Reinheim, DE

Key dates

• Filing date: May 7, 2015
• Grant date: Aug 20, 2019
• Expiry date: Oct 9, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W90/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention comprises a single-component binder for heat-sealing applications which can be used for the sealing of polyester foils, in particular of polyethylene terephthalate foils (PET foils) with respect to containers made of polystyrene, of PVC, and of polyester. These polyesters can in particular be polyethylene terephthalate (PET) or polylactic acid (PLA). The binders here feature not only good seal seam strengths but also in particular good transparency and excellent application properties. A substantive aspect of the invention is that the sealing can be achieved without addition of adhesion promoters, in particular without addition of adhesion promoters based on polyvinyl chloride (PVC) or on polyester, and that barrier properties and sealing properties achieved in respect of containers made of PS and of PET are nevertheless at least comparable with, and sometimes better than, those achieved with heat-sealing systems already marketed.