Cold seal release film with improved scuff resistance

Abstract

A cold seal release film in the form of a monolayer film or an outer layer of a multilayer film. The cold seal release film includes a nucleating agent and 10%-100% by weight of the polymer composition of a polymer selected from the group consisting of poly-1-butene homopolymers, poly-1-butene/ethylene random copolymers having over 50% by weight poly-1-butene therein and a blend of the poly-1-butene homopolymers and poly-1-butene/ethylene random copolymers, and 90%-0% by weight of the polymer composition of a polymer selected from the group consisting of ethylene random copolymers of polypropylene, butene random copolymers of polypropylene and ethylene-butene random terpolymers of polypropylene.

1 . A cold seal release film in the form of a monolayer film or an outer layer of a multilayer film, said cold seal release film comprising a nucleating agent and 10%-100% by weight of the polymer composition of a polymer selected from the group consisting of poly-1-butene homopolymers, poly-1-butene/ethylene random copolymers having over 50% by weight poly-1-butene therein and blends of the poly-1-butene homopolymers and the poly-1-butene/ethylene random copolymers, and 90%-0% by weight of the polymer composition of a polymer selected from the group consisting of ethylene random copolymers of polypropylene, butene random copolymers of polypropylene and ethylene-butene random terpolymers of polypropylene, said polypropylene being over 50% by weight of the polymer composition in said ethylene random copolymers of polypropylene and butene random copolymers of polypropylene and being the major component by weight of the ethylene-butene random terpolymers of polypropylene.  
     
     
         2 . The cold seal release film of  claim 1 , wherein 100% of said polymer composition is selected from the group consisting of poly-1-butene homopolymers, poly-1-butene/ethylene random copolymers having over 50% by weight poly-1-butene therein and blends of the poly-1-butene homopolymers and the poly-1-butene/ethylene random copolymers.  
     
     
         3 . The cold seal release film of  claim 1 , wherein 100% of said polymer composition is a poly-1-butene/ethylene random copolymer having over 50% by weight poly-1-butene therein.  
     
     
         4 . The cold seal release film of  claim 1 , wherein said nucleating agent is 0.02% to 0.1% of sodium benzoate by weight based on the weight of the polymer composition.  
     
     
         5 . The cold seal release film of  claim 2 , wherein said nucleating agent is 0.02% to 0.1% of sodium benzoate by weight based on the weight of the polymer composition.  
     
     
         6 . The cold seal release film of  claim 3 , wherein said nucleating agent is 0.02% to 0.1% of sodium benzoate by weight based on the weight of the polymer composition.  
     
     
         7 . The cold seal release film of  claim 1  being an outer layer of a multilayer film.  
     
     
         8 . The cold seal release film of  claim 2  being an outer layer of a multilayer film.  
     
     
         9 . The cold seal release film of  claim 3  being an outer layer of a multilayer film.  
     
     
         10 . The cold seal release film of  claim 4  being an outer layer of a multilayer film.  
     
     
         11 . The cold seal release film of  claim 5  being an outer layer of a multilayer film.  
     
     
         12 . The cold seal release film of  claim 6  being an outer layer of a multilayer film.  
     
     
         13 . The cold seal release film of  claim 1 , wherein when said film is a monolayer film one surface is a release surface and an opposed surface is treated to receive either a cold seal adhesive or a laminating adhesive thereon, and when said film is the outer layer of a multilayer film an outer surface of said multilayer film opposed to the outer surface of the layer constituting the cold seal release film is treated to receive either a cold seal adhesive or a laminating adhesive thereon.