Patent US10414105

Method of use of polylactide and manufacturing a heat-sealed paper or board container or package
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US10414105

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. (13) (0)

2. The method of claim 1, wherein the coating layer is a monolayer coating layer. (0)

3. The method of claim 1, wherein the polyfunctional cross-linking agent is triallyl isocyanurate (TRIC). (0)

4. The method of claim 1, wherein the share of the polyfunctional cross-linking agent in the blend with polylactide is 1 to 5 wt-%. (0)

5. The method of claim 1, wherein the polylactide blended with the cross-linking agent is EB irradiated to improve adhesion to the paper or board substrate. (0)

6. The method of claim 1, wherein the EB radiation is applied in a dosage in the range of 20 to 200 kGy. (0)

7. The method of claim 1, wherein the EB radiation is carried out in an inert atmosphere, or in vacuum. (1) (0)

9. The method of claim 1, wherein another biodegradable polymer is used as a blend with the polylactide in the extruded coating. (1) (0)

11. The method of claim 1, wherein fibers or inorganic filler particles are included in the coating. (0)

12. The method of claim 1, wherein the substrate comprises a coated board that is turned into a disposable drinking cup or food tray. (0)

13. The method of claim 1, wherein the substrate comprises a coated board that is turned into a closed carton package. (0)

14. The method of claim 1, wherein the substrate is a coated board that is turned into a container closed with a heat-sealed lid. (0)

15. A method according to claim 1, wherein the share of the polyfunctional cross-linking agent in the blend with polylactide is 2 to 3 wt-%. (0)

16. A method according to claim 1, wherein EB radiation is applied in a dosage in the range of 50 to 100 kGy. (0)

17. A method of manufacturing a container or package from polylactide-coated paper or board, comprising (0) (4)

(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 (0) (5)

(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.

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Patent US10414105

Method of use of polylactide and manufacturing a heat-sealed paper or board container or package

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