Method of preparing roll or sheet facestock
First Claim
1. A method of preparing roll or sheet facestock for ink-printable pressure-sensitive adhesive labels comprising the steps of(A) providing a plurality of at least two charges of film-forming resin;
- (B) coextruding said charges to thereby form a construction in the form of a multilayer extrudate comprising a relatively thick core or base layer and at least one relatively thin skin layer, and wherein the charge for said core or base layer comprises a polyolefin polymer or copolymer and is preselected to provide a core or base layer having a stiffness of from between 10 and 100 Gurley, and to provide said facestock with a degree of stiffness suitable for the pressure-sensitive adhesive label application, and the charge for the skin layer or layers is preselected to provide an ink-printable skin,wherein said facestock is suitable for die-cutting and stripping.
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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.
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Citations
16 Claims
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1. A method of preparing roll or sheet facestock for ink-printable pressure-sensitive adhesive labels comprising the steps of
(A) providing a plurality of at least two charges of film-forming resin; -
(B) coextruding said charges to thereby form a construction in the form of a multilayer extrudate comprising a relatively thick core or base layer and at least one relatively thin skin layer, and wherein the charge for said core or base layer comprises a polyolefin polymer or copolymer and is preselected to provide a core or base layer having a stiffness of from between 10 and 100 Gurley, and to provide said facestock with a degree of stiffness suitable for the pressure-sensitive adhesive label application, and the charge for the skin layer or layers is preselected to provide an ink-printable skin, wherein said facestock is suitable for die-cutting and stripping. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of preparing roll or sheet facestock having an overall thickness of from 0.5 to about 6.5 mils for ink-printable pressure-sensitive adhesive labels or signs comprising the steps of
(A) providing a plurality of at least two charges of film-forming resin; -
(B) coextruding said charges to thereby form a construction in the form of a multilayer extrudate comprising a relatively thick core or base layer and at least one relatively thin skin layer, and wherein the charge for said core or base layer comprises a polyolefin polymer or copolymer and is preselected to provide said core with a stiffness of between 10 and 100 Gurley and said facestock with a degree of stiffness suitable for the pressure-sensitive adhesive label application, and the charge for the skin layer is preselected to provide an ink-printable skin; and (C) hot stretching said extrudate wherein said facestock is suitable for die-cutting and stripping. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of preparing film facestock for pressure-sensitive adhesive labels comprising the steps of:
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(A) providing a plurality of at least three charges of film-forming resin; (B) extruding said charges from a coextrusion die to form a coextrudate; and (C) post extrusion finishing of said coextrudate to form a hot-stretched multilayer film from said coextrudate, wherein said finished multilayer film comprises first and second skin layers and a core, said core comprising an olefin polymer or copolymer and having a face side and a back side and being relatively thick with respect to either said first skin layer or second skin layer, and having a stiffness of from between 10 and 100 Gurley and providing said facestock with a degree of stiffness suitable for pressure-sensitive adhesive label applications, said first skin layer being on the face side of the core and being preselected to provide an ink-printable skin and said second skin layer being on the back side of the core and being preselected to provide for pressure-sensitive adhesive anchorage, wherein said facestock is suitable for die-cutting and stripping.
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15. A method of preparing roll or sheet facestock having an overall thickness of from 0.5 to about 6.5 mils for ink-printable pressure-sensitive adhesive labels or signs comprising the steps of
(A) providing a plurality of at least two charges of film-forming resin; -
(B) coextruding said charges to thereby form a construction in the form of a multilayer extrudate comprising a relatively thick core or base layer and at least one relatively thin skin layer, wherein the charge for said core or base layer comprises an polyethylene, polypropylene or a polypropylene copolymer, and said charge is preselected to provide said facestock with a degree of stiffness suitable for the pressure-sensitive adhesive label application, and the charge for the skin layer is preselected to provide an ink-printable skin; and (C) hot stretching said extrudate, wherein said facestock is suitable for die-cutting and stripping. - View Dependent Claims (16)
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Specification