Dart Container has been granted a patent for a polyolefin composition and process to create a lightweight lid for hot food or beverage containers. The lid exhibits stiffness comparable to high impact polystyrene and has a density between 0.900 and 0.999 g/cm³ at 23° C. GlobalData’s report on Dart Container gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Dart Container, was a key innovation area identified from patents. Dart Container's grant share as of July 2024 was 66%. Grant share is based on the ratio of number of grants to total number of patents.
Polyolefin-based lid for hot food or beverage containers
The patent US12024608B2 outlines a novel process for manufacturing lids for food and beverage containers using a polyolefin-based sheet. The process begins with the preparation of a polyolefin blend that includes at least one polyolefin and a filler, which is then combined with a blowing agent. This blend is extruded without venting to create a polyolefin-based sheet, which is subsequently expanded to form an expanded sheet characterized by a density ranging from 0.900 to 0.999 g/cm³ at 23°C. The expansion process results in a sheet with a plurality of cells, and the final step involves shaping this expanded sheet into a lid. The patent specifies that the lids produced can have a density less than water and may exhibit properties such as stiffness comparable to high impact polystyrene lids.
Further details in the claims highlight the specific materials and conditions used in the process. The polyolefin can include various types such as polypropylene and polyethylene, while the fillers may consist of substances like talc or calcium carbonate, with a total filler content exceeding 12 wt.%. The blowing agents specified include sodium bicarbonate and ammonium compounds, present in amounts between 0.2 to 3 wt.%. The process also emphasizes the importance of achieving a controlled average cell diameter in the expanded sheet, ranging from 0.01 to 0.15 mm, and maintaining a shrinkage rate of 1.3 to 1.5% during storage. Overall, the patent presents a comprehensive method for producing lightweight, durable lids suitable for food and beverage applications.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
