Oriented multilayer polyolefin films

A film comprising at least one primary layer and at least one secondary layer, wherein the primary layer is thicker than the secondary layer and additionally comprises a propylene copolymer having a first melting point and the secondary layer comprises a polypropylene homopolymer or copolymer having a second melting point and the second melting point is greater than the first melting point and the multi-layered construction is biaxially stretched, such that a single azimuthal scan maximum of the stretched film is within ±75° with respect to the MD, as measured by WAXS transmission azimuthal scan.

A film comprising at least one primary layer and at least one secondary layer, wherein the primary layer is thicker than the secondary layer and additionally comprises a propylene copolymer having a first melting point and the secondary layer comprises a polypropylene homopolymer or copolymer having a second melting point and the second melting point is greater than the first melting point and the multi-layered construction is biaxially stretched, such that the stretched film exhibits a refractive index in the machine direction (MD) that is greater than the refractive index measured in the transverse direction (TD) and a single azimuthal scan maximum of the stretched film is within ±75° with respect to the MD, as measured by WAXS transmission azimuthal scan.

A film comprising:

• at least one primary layer and at least one secondary layer, wherein the primary layer is thicker than the secondary layer and additionally comprises a major component of a propylene-containing polymer having a first melting point and the secondary layer comprises a major component having a second melting point, the second melting point being greater than the first melting point;
• wherein the multi-layered construction has been biaxially oriented so as to provide a crystalline orientation as determined by wide angle X-ray scattering (WAXS) measurements from the monoclinic (110) crystalline planes that is isotropic or exhibits at most a single specific azimuthal scan maximum, said maximum being positioned at an angle of up to ±75° from the machine direction (MD). The single azimuthal scan maximum in addition possesses an angular full width at half peak height (FWHM) between about 40° to 75°;
• wherein said film has an energy to puncture parallel to the reference or MD of up to about 20 J/cm2.

An adhesive tape backing comprising:

• at least one primary layer and at least one secondary layer, wherein said multi-layered construction has been biaxially oriented so as to provide a crystalline orientation as determined by wide angle X-ray scattering (WAXS) measurements from the monoclinic (110) crystalline planes that is isotropic or exhibits at most a single specific azimuthal scan maximum, said maximum being positioned at an angle of up to ±75° from the machine direction (MD), and said maximum in addition possesses an angular full width at half peak height (FWHM) between about 40° to 75°;
• wherein said film has an energy to puncture parallel to the reference or MD of up to about 20 J/cm2 and a transmittance haze value up to about 2%.

An adhesive tape backing comprising:

• at least one primary layer and at least one secondary layer, wherein said multi-layered construction has been biaxially oriented so as to provide a crystalline orientation as determined by wide angle X-ray scattering (WAXS) measurements from the monoclinic (110) crystalline planes that is isotropic or exhibits at most a single specific azimuthal scan maximum, said maximum being positioned at an angle of up to ±75° from the machine direction (MD), and said maximum in addition possesses an angular full width at half peak height (FWHM) between about 40° to 75°;
• wherein said film has an energy to puncture parallel to the reference or MD of up to about 10 J/cm2 and a transmittance haze up to about 1%.