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Patent US10399744
Issued 2019-09-03
Heat-sealable Biodegradable Packaging Material, A Package Made Thereof, And Use Of A Resin In Extrusion Coating
The invention concerns a heat-sealable biodegradable packaging material, which comprises a fibrous substrate and one or more polymer coating layers extruded onto said substrate. According to the invention the packaging material includes at least one polymer coating layer containing polylactide and at least about 1 weight-% of terpene phenolic resin blended therewith. The invention further concerns a heat-sealed product package made from the packaging material, as well as uses of the resin as blends with polylactide in extrusion coating, for improving line speed and neck-in in extrusion, adhesivity of the coating to the fibrous substrate, and heat-sealability of the coating.
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USPTO Full Text Publication >
- 1. A method of manufacturing a heat-sealed biodegradable container or package, comprising the steps of
(a) extruding a polymer blend consisting of polylactide and at least about 1 weight-% and at most 10 weight-% of terpene phenolic resin as a melt onto a fibrous board base having a basis weight of 170 to 350 g/m2 on a moving line, to produce a heat-sealable board comprising a coating layer of said polymer blend on said board base, wherein said coating layer of said polymer blend is a monolayer having a basis weight of 10 to 30 g/m2, and (b) forming the container or package from the polymer coated board thus obtained by introduction of heat to melt said polymer coating and by heat sealing the board sides or surfaces together.
