Pressure-sensitive adhesive tape
AssigneeMinnesota Mining and Manufacturing Company
InventorsAlan J. Sipinen, Del A. Kauss
Life of this patent
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Abstract
Normally tacky, pressure-sensitive adhesive tapes which are soft, pliable, conformable, and heat sealable are provided. The tapes have a backing of a substantially untensilized, tough, ductile film, the film being a blend of crystalline isotactic polypropylene and a compatible ethylene-based polymer, and a normally tacky, pressure-sensitive adhesive on one side of the film. The films have a longitudinal secant modulus of less than 3700 kg/cm.sup.2, a transverse secant modulus of less than 3700 kg/cm.sup.2, a longitudinal elastic modulus of less than 5200 kg/cm.sup.2, a transverse elastic modulus of less than 5200 kg/cm.sup.2, a longitudinal stiffness of less than 1.7, and a transverse stiffness of less than 3.0.
Claims14
A disposable diaper having attached thereto a diaper closure comprising a pressure-sensitive adhesive tape comprising a film comprising a blend of crystalline isotactic polypropylene and very low density polyethylene, said film having a longitudinal secant modulus of less than about 3700 kg/cm.sup.2, a transvere secant modulus of less than about 3700 kg/cm.sup.2, a longitudinal elastic modulus of less than about 5200 kg/cm.sup.2, a transverse elastic modulus of less than about 5200 kg/cm.sup.2, a longitudinal stiffness of less than about 1.7, and a transverse stiffness of less than about 3.0, and a surface energy of less than about 40 erg/cm.sup.2 and, on one side thereof, a normally tacky pressure-sensitive adhesive.
Dependencies are inferred from the claim text.