Paperboard substrate for blister packaging

Abstract

A packaging laminate comprising a paperboard substrate for providing a base layer, a tear-resistant polymer layer applied to said substrate, and a heat seal polymer layer applied to said tear-resistant polymer. This laminate structure is particularity useful for blister pack packaging.

1 - 27 . (canceled)  
   
   
       28 . A blister pack laminate comprising: 
 a substrate having inner and outer surfaces;    a tear-resistant polymer layer positioned interior to the inner surface of the substrate;    an adhesion inhibitor positioned between the substrate and the tear-resistant polymer layer wherein the adhesion inhibitor promotes disengagement of the substrate from the tear-resistant layer to reduce stress concentration, crack propagation or a combination thereof in the tear resistance layer; and    a heat seal polymer layer positioned interior to the tear-resistant layer.    
   
   
       29 . The laminate of  claim 28 , wherein the substrate is paperboard.  
   
   
       30 . The laminate of  claim 28 , wherein the tear resistant polymer layer comprises cross laminated HDPE.  
   
   
       31 . The laminate of  claim 28 , wherein the tear resistant polymer layer comprises oriented or biaxially oriented polyamide and oriented polyester.  
   
   
       32 . The laminate of  claim 28 , wherein the heat seal polymer layer is selected from the group consisting of EVA, EMA, ionomers, acrylic copolymers, acrylate copolymers and combination of two or more thereof.  
   
   
       33 . The laminate of  claim 28 , wherein the heat seal polymer layer has anti-blocking agents to reduce the tackiness of the heat seal polymer layer.  
   
   
       34 . The laminate of  claim 28 , wherein the anti-blocking agents comprise calcium carbonate, talc or silica.  
   
   
       35 . The laminate of  claim 28 , further comprising a coating layer positioned exterior to the outer surface of the substrate.  
   
   
       36 . The laminate of  claim 28 , further comprising a tie layer between the substrate and the tear resistant polymer layer.  
   
   
       37 . The laminate of  claim 28 , further comprising a tie layer positioned between the tear-resistant polymer layer and the heat seal polymer layer.  
   
   
       38 . The laminate of  claim 28 , further comprising a layer of adhesive primer positioned between the substrate and the tear-resistant polymer layer.  
   
   
       39 . The laminate of  claim 28  wherein the adhesion inhibitor is a layer.  
   
   
       40 . A blister pack laminate, comprising: 
 a substrate having inner and outer surfaces;    a coating layer positioned exterior to the outer surface of the substrate;    a tear-resistant polymer layer positioned interior to the inner surface of the substrate;    an adhesion inhibitor disposed between the substrate and the tear-resistant polymer layer wherein the adhesion inhibitor promotes disengagement of the substrate from the tear-resistant layer to reduce stress concentration, crack propagation or a combination thereof in the tear resistance layer; and    a heat seal polymer layer positioned interior to the tear-resistant layer.    
   
   
       41 . The laminate of  claim 40 , wherein the tear resistant polymer layer is a cross laminated HDPE tear resistant layer.  
   
   
       42 . The laminate of  claim 40 , wherein the heat seal polymer layer is selected from the group consisting of EVA, EMA, ionomers, acrylic copolymers, acrylate copolymers and combination of two or more thereof.  
   
   
       43 . A blister pack laminate comprising: 
 a substrate having inner and outer surfaces;    a tear-resistant polymer layer positioned interior to the inner surface of the substrate;    an adhesion inhibitor positioned between the substrate and the tear-resistant polymer layer; and    a heat seal polymer layer positioned interior to the tear-resistant polymer layer.    
   
   
       44 . The blister pack laminate of  claim 43  further comprising a coating layer positioned exterior to the outer surface of the substrate.  
   
   
       45 . The blister pack laminate of  claim 43  further comprising a tie layer between the substrate and the tear-resistant polymer layer.  
   
   
       46 . The blister pack laminate of  claim 43  further comprising a tie layer between the tear-resistant layer and the heat seal polymer layer.  
   
   
       47 . The blister pack laminate of  claim 43  wherein the adhesion inhibitor promotes disengagement of the substrate from the tear-resistant layer so as to reduce stress concentration and crack propagation in the tear resistance layer.  
   
   
       48 . The blister pack laminate of  claim 43  wherein the adhesion inhibitor is a layer.  
   
   
       49 . The blister pack laminate of  claim 48  wherein the adhesion inhibitor is a discontinuous layer.  
   
   
       50 . The blister pack laminate of  claim 49  wherein the adhesion inhibitor is a continuous layer.  
   
   
       51 . The blister pack laminate of  claim 43  wherein the adhesion inhibitor is layer which is applied with a nip roll.  
   
   
       52 . The blister pack laminate of  claim 43  wherein the tear resistant polymer layer comprises cross laminated HDPE.  
   
   
       53 . The blister pack laminate of  claim 43  wherein the tear resistant polymer layer comprises oriented or biaxially oriented polyamide and oriented polyester.