Polymeric compositions with high self-adhesion and packaging materials and packages made therefrom
AssigneeAmerican National Can Company
InventorGregory K. Jones
Life of this patent
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Abstract
The invention relates to a polymeric composition which acts as an improved cold seal mechanism over prior art cold seal structures. The composition comprises a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a lower viscosity, non-tacky resin. The composition has a seal strength of at least 0.2 lbs per inch when sealed to itself at a temperature of less than 120.degree. F., and can be formed into a film for subsequent use in packaging.
Claims31
An extrudable polymeric composition comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said composition having a seal strength of at least 0.2 lbs. per inch when sealed to itself at a temperature of less than 120.degree. F.
A coextruded multilayer, polymeric film having a sealant layer comprising a blend of 40% to 80% by weight of a tacky adhesive and 60% to 20% by weight of a non-tacky resin, said non-tacky resin having a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion, said sealant layer being capable of forming a cold seal bond.
An extrudable polymeric composition comprising a blend of:
- (a) 40% to 80% by weight of a tacky adhesive styrene-isoprene copolymer;
- (b) 60% to 20% by weight of a non-tacky resin;
- wherein said non-tacky resin has a viscosity at least one and a half times less than the viscosity of the tacky adhesive, said viscosity being measured at a shear rate similar to the shear rate encountered during extrusion.
A coextruded multilayer polymeric film comprising:
- (a) a first sealant layer, said first layer comprising a blend of 40% to 80% by weight of said blend of a tacky adhesive styrene-isoprene copolymer and 60% to 20% by weight of said blend of a non-tacky resin;
- (b) a second core layer, said second layer disposed in surface-to-surface contact with said first layer, said second layer comprising white polypropylene;
- and
- (c) a third layer, said third layer disposed in surface-to-surface contact with said second layer, said third layer comprising polypropylene.
Dependencies are inferred from the claim text.