Composite facestocks and liners
First Claim
1. A liner comprising a multilayer web construction for use with label, tape or sign stock, said web construction comprising a coextrudate in the form of at least two firmly adhered layers, at least one of said layers comprising a multiphase layer including a continuous phase of polymeric film material and a discontinuous phase of filler material, said liner having at least one face that is roughened at least in part by the mechanical effect of the filler material contained in said coextrudate, to a roughness of at least about 10 Sheffield units, a release face provided on one face of said liner.
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Accused Products
Abstract
Film-forming means are coextruded to form all plastic multilayer liners and facestocks for pressure-sensitive labels, tapes, decals, signs, bumper stickers, and other products formed from sheet and roll stock. Fill means in a charge for the liner coextrusion affects stiffness and dimensional stability of the liner and/or affects the roughness of a liner face or faces. The film materials of the layers of the constructions are selected according to the cost/benefit characteristics of candidate materials considering the functional or operational requirements of the layer in question.
151 Citations
30 Claims
- 1. A liner comprising a multilayer web construction for use with label, tape or sign stock, said web construction comprising a coextrudate in the form of at least two firmly adhered layers, at least one of said layers comprising a multiphase layer including a continuous phase of polymeric film material and a discontinuous phase of filler material, said liner having at least one face that is roughened at least in part by the mechanical effect of the filler material contained in said coextrudate, to a roughness of at least about 10 Sheffield units, a release face provided on one face of said liner.
- 11. A liner comprising a multilayer web construction for use with label, tape, or sign stock, said web construction comprising a coextrudate in the form of a multiphase core or base layer and a skin layer on at least one side of the core or base layer, said core or base layer including a continuous phase of polymeric film material and a discontinuous phase of filler material, said filler material comprising by weight a minority of the total core composition, both said phases being dimensionally stable under conditions of moisture absorption or desorption, both said layers being substantially free of connected voids, whereby dimensional stability of said construction is independent of humidity conditions, and said construction therefore remains flat under varying humidity conditions as encountered at different geographic locations or at the same location at different times, and under varying web temperature conditions as encountered in hot air drying of inks or coatings for face-stocks with which the liner is used.
- 17. As an article of manufacture, a multiphase thermoplastic flexible extruded film comprising a continuous phase of film-forming plastic compound, a discontinuous phase of filler particles including high-aspectratio filler particles oriented at least in the machine direction, and a phase of voids each located adjacent to or around its own associated filler particle and in isolated relationship to other voids.
- 19. A multilayer facestock for use in pressure-sensitive label, tape or sign applications comprising a coextrudate of cojoined layers comprising a relatively thick core or base layer of polymeric film material of a stiffness of between 10 and 100 Gurley and which contributes the majority of the dimensional stability and stiffness of labels or signs cut or formed from the facestock, and at least one relatively thin skin layer, said skin layer being on the face side of the coextrudate and having an ink-printable surface, and a pressure-sensitive adhesive layer combined at the side of said coextrudate opposite said face side.
- 26. A liner comprising a multilayer web construction for use with label, tape and sign stock, said web construction comprising oriented stretched coextrudate in the form of at least two firmly adhered layers, at least one of said layers comprising a multi-phase layer including a continuous phase of polymeric film material, a discontinuous phase of solid filler material and a discontinuous phase of voids associated with and partly surrounding particles of said solid filler material.
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30. A multilayer stock for use in pressure-sensitive label, tape or sign applications comprising a facestock and a releasable liner, said facestock comprising a coextrudate of cojoined layers comprising a relatively thick core or base layer of polymeric film material of a stiffness of between 10 and 100 Gurley and which contributes the majority of the dimensional stability and stiffness of labels or signs cut or formed form the facestock, and at least one relatively thin skin layer, said skin layer being on the face side of the coextrudate and having an ink-printable surface, and a pressure-sensitive adhesive layer combined at the side of said coextrudate opposite said face side, said releasable liner being combined on the adhesive side of said facestock, said releasable liner comprising a multilayer web liner construction, said multilayer web liner construction comprising a coextrudate in the form of at least two firmly adhered layers, at least one of said layers comprising a multiphase layer including a continuous phase of polymeric film material and a discontinuous phase of filler material, said liner having at least one face that is roughened at least in part by the mechanical effect of the filler material contained in said coextrudate, to a roughness of at least about 10 Sheffield units, and a release face provided on one face of said liner for releasable contact with said pressure-sensitive adhesive layer of said facestock.
Specification