New Invention Profile
| Publication No: | IN202411004790 [India] | Application No: | IN202411004790 |
| Title: | A single step process for the recycling of metal/polymer laminates | ||
| Publication Date: | 08-08-2025 | File Date: | 23-01-2024 |
| Inventor(s): | Parveen Saini; Neha; Anuj; Rahul Saha; Sushil Kumar | ||
| IPC Classification: | C08J11/00, B32B27/32 | ||
| Abstract: | The present invention belongs to the technical field for recycling of waste multilayer polymers (MLPs) packaging-based metal/polymer laminate materials via wet chemical process, and in particular focusing on delamination of polymeric layers and their demetallization via selective etching/dissolution of ultrathin aluminium layer, to isolate neat polymeric fraction for further processing and utilization. The method comprises of treatment of predecided sizes[shredded pieces of 2-4 mm size range] of the waste multilayers packaging (MLP) materials [composed of sandwiched thermoplastic polymer layer based multilayer laminates having coating of ultrathin aluminium layer on one of the polymeric layer] with a liquid medium [solution of a specific organic reagents e.g., chloroform, toluene, THF, DMF etc. and aqueous electrolyte e.g. KOH in the ratio range of 1:2 to 2:1], specified liquid medium to MLP ratio [10-30] by agitation for specified time [20 to 90 mins] and at specified temperature [40 to 60oC] and specified agitation conditions [200 to 400 rpm] inside a reactor; thus affecting the delamination and demetallization, followed by separating the polymeric fractions from liquid medium, washing, and thus obtaining neat polymeric fraction and hydrogen gas a very important byproduct. |
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CSIR-National Physical Laboratory[CSIR-NPL]
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: director[at]nplindia[dot]org
:91-11-45609201
:https://www.nplindia.in
Industrial Applications
Chemistry, Chemical Processes Polymers [Chemistry, Chemical Processes]
Pollution control [Environmental (Clean Tech)]
Polymers [Materials]
Recycling [Environmental (Clean Tech)]