Sealed Air. has filed a patent for a method to recycle composite materials containing polyolefin and polyvinylidene chloride. The process involves using a polar aprotic solvent to dissolve the polyvinylidene chloride, leaving the undissolved composite material free from the chloride. The precipitated chloride can be collected separately. GlobalData’s report on Sealed Air 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 Sealed Air, Fiber-reinforced material joining techniques was a key innovation area identified from patents. Sealed Air's grant share as of January 2024 was 60%. Grant share is based on the ratio of number of grants to total number of patents.

Recycling composite material of polyolefin and polyvinylidene chloride

Source: United States Patent and Trademark Office (USPTO). Credit: Sealed Air Corp

A patent application (Publication Number: US20240018329A1) describes a method for recycling composite materials containing polyolefin and polyvinylidene chloride. The method involves providing the composite material, subjecting it to a polar aprotic solvent to dissolve some of the material, separating the undissolved composite material, which includes dissolved polyvinylidene chloride, and collecting it. The polar aprotic solvent used is primarily N-methyl-2-pyrrolidone, dihydrolevoglucosenone, triethyl phosphate, tetrahydrofuran, or blends thereof, with a purity of at least 90 wt %.

Additionally, the method includes mechanically grinding or shredding the composite material before subjecting it to the solvent, and the solvent has a temperature below 160°C. The composite material can be a multilayer barrier film, and the process aims to precipitate polyvinylidene chloride out of the solution with a purity of at least 99.0 wt %. The system for recycling these composite materials includes a shredder or grinder, a solvent bath with a polar aprotic solvent, a filter to separate undissolved material, and a collector for the undissolved composite material, allowing for efficient recycling of polyolefin and polyvinylidene chloride composite materials.

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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.