Polymer-coated cellulosic release liner base material
AssigneeUpm-Kymmene Corporation
InventorsKuisma Littunen, Harri Kosonen, Jaakko Rautalahti, Janne Antila, Mikko Rissanen
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Abstract
The invention relates to a polymer-coated cellulosic substrate (S2) for a release liner (REL1), comprising a cellulosic support layer (PAP1), a first coating layer (PO1), comprising a first composition containing polyolefin, and an extruded primer layer (PRIM1) comprising a second composition containing a thermoplastic polymer covalently bonded to functional vinyl groups: wherein the first coating layer (POI) is situated between the cellulosic support layer (PAP1) and the extruded primer layer (PRIM1).
Claims10
A polymer-coated cellulosic substrate for a release liner, comprising
- a cellulosic support layer,
- a first coating layer comprising a first composition containing polyolefin,
- an extruded primer layer comprising a second composition containing a thermoplastic polymer covalently bonded to functional vinyl groups;
- wherein the first coating layer is situated between the cellulosic support layer and the extruded primer layer,
- wherein the thermoplastic polymer covalently bonded to functional vinyl groups has been formed from a thermoplastic polyvinyl alcohol having a degree of hydrolysis in the range of 65 to 95 mol %.
The polymer-coated cellulosic substrate according to 1, wherein the thermoplastic polymer covalently bonded to functional vinyl groups is a reaction product of a molten thermoplastic and a grafting agent containing functional vinyl groups.
Dependencies are inferred from the claim text.