Biaxially oriented polypropylene-based multilayer film
By using a biaxially oriented multilayer film with metallocene-catalyzed ethylene-propylene-1-butene terpolymer as the outer layer material, the shortcomings of BOPP multilayer films in terms of sealing performance and recycling performance are solved, achieving the effects of low sealing onset temperature and wide processing window, which is suitable for food packaging and other fields.
Patent Information
- Application Number
- CN202480015895.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2023-03-07
- Filing Date
- 2024-02-29
- Publication Date
- 2026-06-05
- Estimated Expiration
- 2044-02-29
AI Technical Summary
Existing BOPP multilayer films have shortcomings in sealing performance and low extractable content, especially in meeting the requirements for improved sealing initiation temperature and optical performance after changes in market demand. At the same time, they face the challenge of matching the performance of different materials during recycling.
A multilayer film was prepared by using a metallocene-catalyzed ethylene-propylene-1-butene terpolymer as the outer layer material and combining it with a polypropylene resin core layer through a biaxial orientation process. The outer layer material contains a specific ratio of ethylene, propylene and butene units, and the melt flow rate, melting temperature and xylene cold soluble content are controlled to improve sealing performance and processing window.
It achieves a low sealing initiation temperature and a wide processing window, improving the film's sealing and optical properties while providing good recyclability, making it suitable for packaging applications of a variety of materials.