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Patent US10414105
Issued 2019-09-17
Method Of Use Of Polylactide And Manufacturing A Heat-sealed Paper Or Board Container Or Package
The invention relates to use of polylactide (PLA) as an extruded polymer coating on paper or board intended for the production of containers and packages, which are heated in a stove or microwave oven. According to the invention a polyfunctional cross-linking agent, such as trialkyl isocyanurate (TAIC), is blended with PLA, and the extruded coating layer is subjected to cross-linking electron beam (EB) radiation. PLA may be used as such or blended with another biodegradable polyester such as polybutylene succinate (PBS). EB radiation has been found to improve adhesion of the coating to the paper or board substrate, heat-scalability of the coating, and heat-resistance of the finished containers and packages.
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- 1. A method for forming an extruded polymer coating on a fibrous substrate, comprising blending a polyfunctional cross-linking agent with polylactide to form a blend, extruding the blend as a coating layer on the substrate, increasing adhesion of the extruded coating layer to the substrate by subjecting the extruded coating layer to cross-linking electron beam (EB) radiation, and heat-sealing the cross-linked polymer coated substrate to form a container or package, which is configured to be heated in a stove or microwave oven.
- 17. A method of manufacturing a container or package from polylactide-coated paper or board, comprising
(i) blending polylactide with a polyfunctional cross-linking agent, (ii) extruding the blend as a coating layer onto the paper or board, (iii) subjecting the coating layer to cross-linking electron beam (EB) radiation, and (iv) turning the coated paper or board into the container or package by heat-sealing of the cross-linked coating layer.
- 18. A method of manufacturing a container or package from polylactide-coated paper or board, comprising
(i) blending polylactide with a polyfunctional cross-linking agent, (ii) extruding the blend as a coating layer onto the paper or board, (iii) turning the coated paper or board into the container or package, (iv) subjecting the coating layer to cross-linking electron beam (EB) radiation, and (v) heat-sealing the cross-linked polymer coated paper or board.
