SUPPORT FILM, IN PARTICULAR FOR AN ADHESIVE TAPE AND USE THEREOF
Support film, in particular for an adhesive tape that is stretched monoaxially in the longitudinal direction and that contains a base layer made of polypropylene and a co-extrusion layer made of polyethylene, characterized in that the tension in the longitudinal direction at 10% strain is at least 150 N/mm 2 , preferably at least 200 N/mm 2 , most preferably at least 250 N/mm 2 and a separating enamel coat is applied to the exterior side of the co-extrusion layer.
1 . A carrier film for an adhesive tape, which is oriented monoaxially in longitudinal direction and which comprises a base layer of polypropylene and a coextrusion layer of polyethylene, wherein the stress in longitudinal direction at 10% elongation is at least 150 N/mm 2 and further comprises a release coating applied on the outer side of the coextrusion layer.
2 . The carrier film according to claim 1 , wherein the carrier film
has a draw ratio in longitudinal direction of at least 1:8,
a has a tensile strength in longitudinal direction of at least 300 N/mm 2 , and
has a stress in longitudinal direction at 1% elongation of at least 20 N/mm 2 .
3 . The carrier film according to claim 1 , wherein the carrier film has a thickness of 25 to 200 μm.
4 . The carrier film according to claim 1 , wherein the base layer comprises a polypropylene with a melt index of 0.3 to 15 g/10 min, and with a flexural modulus of at least 1600 MPa.
5 . The carrier film according to claim 1 , wherein the polypropylene of the base layer is nucleated.
6 . The carrier film according to claim 1 , wherein the fraction of polyethylene in the coextrusion layer is between 50% and 100% by weight.
7 . The carrier film as according to claim 1 , wherein the polyethylene of the coextrusion layer is a homopolymer.
8 . The carrier film according to claim 1 , wherein the thickness of the coextrusion layer is 3% to 20% of the total film thickness.
9 . The carrier film according to claim 1 , wherein the film comprises an adhesive applied to at least one side of the film.
10 . (canceled)
11 . The carrier film according to claim 1 wherein the stress in longitudinal direction at 10% elongation is at least 200 N/mm 2 .
12 . The carrier film according to claim 7 wherein the homopolymer is PE HD.