Crown closure

Abstract

A crown closure having a polyolefin liner that can be readily removed, said crown closure comprising a crown shell having a primer layer on its inner surface and a polyolefin liner applied to the inside of said crown shell, characterized in that said primer layer is a two-component priming consisting of an undercoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and a topcoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other compatible resin, with the provision of a printing layer of indicia at the interface between said undercoat and topcoat layers or atop said topcoat layer. Aforesaid crown closure can be prepared by providing at one face of a metal stock sheet a primer undercoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene.Iaddend., printing indicia thereon, providing atop said undercoat layer a primer topcoat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other compatible resin, and thereafter forming said metal stock sheet into crown shells in such a manner that said coating layers come to the inside of the shells followed by depositing a polyolefin mass in said shells and molding same into the form of liners.

We claim: 
     
       1. A crown closure having a removable polyolefin liner, said crown closure comprising a crown shell having a primer layer on its inner surface and the polyolefin liner applied to the inside of said crown shell, characterized in that said primer layer is a two-component priming consisting of an under coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and a top coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one compatible resin, with the provision of a printing layer of indicia at the interface between said under coat and top coat layers or atop said top coat layer. 
     
     
       2. A crown closure of claim 1 wherein said polyolefin liner is a polyethylene liner. 
     
     
       3. A crown closure of claim 1 wherein the oxygen content of said .[.polyethylene oxide.]. .Iadd.oxidized polyethylene .Iaddend.is 0.1-10%. 
     
     
       4. A crown closure of claim 1 wherein said .[.polyethylene oxide.]. .Iadd.oxidized polyethylene .Iaddend.has an average molecular weight of 1000-50,000. 
     
     
       5. A crown closure of claim 1 wherein said under coat layer contains .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other resin. 
     
     
       6. A crown closure of claim 5 wherein said other resin is a thermosetting resin. 
     
     
       7. A crown closure of claim 1 wherein said top coat layer contains, based on said top coat layer, 1-50% by weight of the .[.polyethylene oxide.]. .Iadd.oxidized polyethylene .Iaddend.and 50-99% by weight of said resin component compatible. 
     
     
       8. A crown closure of claim 1 wherein said indicia are printed using ink used for printing on metals. 
     
     
       9. A process for manufacturing a removable crown closure having a polyolefin liner that can be readily removed, said process comprising providing at one face of a metal stock sheet a primer under coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene, .Iaddend.printing indicia thereon, providing atop said under coat layer a primer top coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other compatible resin, and thereafter forming said metal stock sheet into crown shells in such a manner that said coating layers come to the inside of the shells, followed by depositing a polyolefin mass in said shells and molding said mass into the form of liners. 
     
     
       10. A process for manufacturing a crown closure having a removable polyolefin liner said process comprising providing at one face of a metal stock sheet a primer under coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene, .Iaddend.providing atop said under coat layer a top coat layer containing .[.a polyethylene oxide.]. .Iadd.an oxidized polyethylene .Iaddend.and at least one other compatible resin, printing indicia on said top coat layer, and thereafter forming said metal stock sheet into crown shells in such a manner that said coating layers come to the inside of the shells, followed by depositing a polyolefin mass in said shells and molding said mass into the form of liners.