Patent ID: 7648608
Filing Date: 2010-01-19
Classification: B32B,Y10T

Abstract:
1. A process for the production of a multilayer coextrudate having a plastic release layer located against and releasable from a pressure-sensitive adhesive, the process comprising the steps of: extruding a first substrate web; and combining a second substrate web, a pressure-sensitive adhesive layer and a plastic release layer comprising at least one release agent, said at least one release agent comprising a silicone graft copolymer or silicone block copolymer, within a single extrusion die and coextruding the second substrate web, the pressure-sensitive adhesive layer and the plastic release layer simultaneously through said single extrusion die; wherein the second substrate web is bonded to the plastic release layer and the layer of pressure-sensitive adhesive is disposed on one side of the first substrate web; and wherein the at least one release agent of the plastic release layer does not migrate into the pressure-sensitive adhesive layer, and the release properties of the plastic release layer against the pressure-sensitive adhesive are stable against aging.