Release film having a thin release coating

The release film according to any one of the preceding claims, wherein the polyolefin comprises a mixture of an ethylene homopolymer or copolymer and a propylene homopolymer or copolymer.

The release film according to any one of the preceding claims, wherein release coating has a basis weight of at most 0.65 g/m2;

• preferably at most 0.60 g/m2, more preferably at most 0.55 g/m2, even more preferably at most 0.50 g/m2, most preferably at most 0.45 g/m2, and in particular at most 0.40 g/m2;
• preferably at most 0.35 g/m2, more preferably at most 0.30 g/m2, even more preferably at most 0.25 g/m2, most preferably at most 0.20 g/m2.

The release film according to any one of the preceding claims, which has a total layer thickness of at least 10 μm.

The release film according to any one of the preceding claims, wherein the optionally provided first sealing layer (a) and/or the optionally provided second sealing layer (c) are each independently based on

• polyolefins, wherein the polyolefin is selected from the group consisting of olefin homopolymers or copolymers of α,ß-unsaturated olefins having 2 to 10 carbon atoms;
• and
• an ethylene-vinyl acetate copolymer.

The release film according to any one of the preceding claims, wherein the optionally provided first sealing layer (a) and/or the optionally provided second sealing layer (c) are each independently based on an ethylene-vinyl acetate polymer.

The release film according to any one of the preceding claims, wherein the optionally provided first sealing layer (a) and/or the optionally provided second sealing layer (c) are each independently based on polyolefin, wherein the polyolefin is selected from the group consisting of olefin homopolymers or copolymers of α,β-unsaturated olefins having 2 to 10 carbon atoms.

The release film according to any one of the preceding claims, wherein the release coating directly adjoins with the carrier film.

The release film according to any one of the preceding claims, which has a total layer thickness of at least 5.0 μm;

• preferably at least 6.0 μm, more preferably at least 7.0 μm, even more preferably at least 8.0 μm, most preferably at least 9.0 μm, and in particular at least 10 μm.

The release film according to any one of the preceding claims, which has a total layer thickness in the range of 5.0 μm to 50 μm;

• preferably in the range of 10±5.0 μm, or 12.5±5.0 μm, or 15±5.0 μm, or 17.5±5.0 μm, or 20±5.0 μm.

The release film according to any one of the preceding claims, wherein the second surface side of the release film is uncoated.

The release film according to any one of the preceding claims, which consists of the carrier film and the release coating.

The release film according to any one of the preceding claims, wherein the first surface side and optionally the second surface side are preferably each coated independently of one another by at least 10%;

• preferably at least 20%, preferably at least 30%, preferably at least 40%, preferably at least 50%, preferably at least 60%, more preferably at least 70%, even more preferably at least 80%, most preferably at least 90%, and in particular completely (100%).

The release film according to any one of the preceding claims, wherein the carrier film is smooth.

The release film according to any one of the preceding claims, wherein the carrier film is structured.

The release film according to any one of the preceding claims, wherein the carrier film is embossed.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier film is non-planar.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier liner has an embossed structure on at least part of its surface.

The release film according to any one of the preceding claims, wherein first surface side and the second surface side of the carrier film each have an embossed structure on at least part of their surface.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier film has embossed protrusions.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier film has an average peak-to-valley height Rz according to DIN EN ISO 4287 of at least 5.0 μm;

• preferably at least 7.0 μm, more preferably at least 9.0 μm, even more preferably at least 11 μm, most preferably at least 13 μm, and in particular at least 15 μm.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier film preferably has an average peak-to-valley height Rz according to DIN EN ISO 4287 of at most 100 μm;

• preferably at most 90 μm, more preferably at most 80 μm, even more preferably at most 70 μm, most preferably at most 60 μm, and in particular at most 50 μm.

The release film according to any one of the preceding claims, wherein the first surface side of the carrier film has an average peak-to-valley height Rz according to DIN EN ISO 4287 in the range of 5.0 to 100 μm;

• preferably in the range of 10±5.0 μm, or 12.5±5.0 μm, or 15±5.0 μm, or 17.5±5.0 μm, or 20±5.0 μm, or 22.5±5.0 μm, or 25±5.0 μm, or 27.5±5.0 or 30±5.0 μm, or 32.5±5.0 μm, or 35±5.0 μm, or 37.5±5.0 μm, or 40±5.0 μm, or 42.5±5.0 μm, or 45±5.0 μm, or 47.5±5.0 μm, or 50±5.0 μm, or 52.5±5.0 μm, or 55±5.0 μm, or 57.5±5.0 μm, or 60±5.0 μm, or 62.5±5.0 μm, or 65±5.0 μm, or 67.5±5.0 μm, or 70±5.0 or 72.5±5.0 μm, or 75±5.0 μm, or 77.5±5.0 μm, or 80±5.0 μm, or 82.5±5.0 μm, or 85±5.0 μm, or 87.5±5.0 μm, or 90±5.0 μm, or 92.5±5.0 μm, or 95±5.0 μm.

The release film according to any one of the preceding claims, wherein the carrier film is single-layer.

The release film according to any one of the preceding claims, wherein layer (b) forms the first surface side of the carrier film.

The release film according to any one of the preceding claims, wherein layer (b) forms the second surface side of the carrier film.

The release film according to any one of the preceding claims, wherein the first sealing layer (a) forms the first surface side of the carrier film.

The release film according to any one of the preceding claims, wherein the second sealing layer (c) forms the second surface side of the carrier film.

The release film according to any one of the preceding claims, wherein the carrier film is based on a polyolefin blend, or wherein the carrier film comprises at least one layer which is based on a polyolefin blend.

The release film according to any one of the preceding claims, wherein the carrier film does not comprise a layer which is based on a nonwoven or comprises a nonwoven.

The release film according to any one of the preceding claims, wherein the carrier film does not comprise a layer which is based on paper or comprises paper.

The release film according to any one of the preceding claims, wherein the release coating has a basis weight of at least 0.1 g/m2;

• preferably at least 0.15 g/m2, more preferably at least 0.2 g/m2, even more preferably at least 0.25 g/m2, most preferably at least 0.3 g/m2, and in particular at least 0.35 g/m2.

The release film according to any one of the preceding claims, wherein the release coating has a basis weight of at most 0.6 g/m2;

• preferably at most 0.5 g/m2, more preferably at most 0.4 g/m2, even more preferably at most 0.3 g/m2, and most preferably at most 0.2 g/m2.

The release film according to any one of the preceding claims, wherein the release coating has a layer thickness of at least 0.10 μm;

• preferably at least 0.15 μm, more preferably at least 0.20 μm, even more preferably at least 0.25 μm, most preferably at least 0.30 μm, and in particular at least 0.35 μm.

The release film according to any one of the preceding claims, wherein the release coating preferably has a layer thickness of at most 4.0 μm;

• preferably at most 3.5 μm, more preferably at most 3.0 μm, even more preferably at most 2.5 μm, most preferably at most 2.0 μm, and in particular at most 1.0 μm.

The release film according to any one of the preceding claims, wherein the release coating has a layer thickness in the range of 0.10 to 4.0 μm;

• preferably in the range of 0.15±0.05 or 0.20±0.05 μm, or 0.25±0.05 μm, or 0.30±0.05 μm, or 0.35±0.05 μm, or 0.45±0.05 μm, or 0.50±0.05 μm, or 0.55±0.05 μm, or 0.60±0.05 μm, or 0.65±0.05 μm, or 0.70±0.05 μm, or 0.75±0.05 μm, or 0.80±0.05 μm, or 0.85±0.05 μm, or 0.90±0.05 μm, or 0.95±0.05 μm, or 1.5±0.5 μm, or 2.0±0.5 μm, or 2.5±0.5 μm, or 3.0±0.5 μm, or 3.5±0.5 μm.

The release film according to any one of the preceding claims, wherein the first sealing layer (a) has a layer thickness of at least 1.0 μm;

• preferably at least 2.0 μm, preferably at least 3.0 μm, preferably at least 4.0 μm, preferably at least 5.0 μm, more preferably at least 6.0 μm, even more preferably at least 7.0 μm, most preferably at least 8.0 μm, and in particular at least 9.0 μm.

The release film according to any one of the preceding claims, wherein the first sealing layer (a) has a layer thickness of at most 10 μm;

• preferably at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, and in particular at most 5.0 μm.

The release film according to any one of the preceding claims, wherein the first sealing layer (a) has a layer thickness in the range of 4.0 to 10 μm;

• preferably of 5.0 to 9.0 μm, and more preferably of 6.0 to 8.0 μm.

The release film according to any one of the preceding claims, wherein layer (b) has a layer thickness of at least 5.0 μm;

• preferably at least 6.0 μm, more preferably at least 8.0 μm, even more preferably at least 9.0 μm, most preferably at least 12 μm, and in particular at least 16 μm.

The release film according to any one of the preceding claims, wherein layer (b) has a layer thickness of at most 24.9 μm;

• preferably at most 22 μm, more preferably at most 20 μm, even more preferably at most 18 μm, most preferably at most 16 μm, and in particular at most 14 μm.

The release film according to any one of the preceding claims wherein layer (b) has a layer thickness in the range of 5.0 to 24.9 μm;

• preferably of 6.0 to 22 μm, more preferably of 8.0 to 20 μm, even more preferably from 9.0 to 18 μm, and most preferably of 12 to 16 μm.

The release film according to any one of the preceding claims, wherein the second sealing layer (c) has a layer thickness of at least 4.0 μm;

• preferably at least 5.0 μm, more preferably at least 6.0 μm, even more preferably at least 7.0 μm, most preferably at least 8.0 μm, and in particular at least 9.0 μm.

The release film according to any one of the preceding claims, wherein the second sealing layer (c) has a layer thickness of at most 10 μm;

• preferably at most 9.0 μm, more preferably at most 8.0 μm, even more preferably at most 7.0 μm, most preferably at most 6.0 μm, and in particular at most 5.0 μm.

The release film according to any one of the preceding claims, wherein the second sealing layer (c) has a layer thickness in the range of 4.0 to 10 μm;

• preferably of 5.0 to 9.0 μm, and more preferably of 6.0 to 8.0 μm.

The release film according to any one of the preceding claims, wherein the machine direction tensile strength of the release film is at least 6.5 N/cm, preferably determined according to DIN EN ISO 527-3.

The release film according to any one of the preceding claims, wherein the difference between the maximum release force of the release film and the average release force of the release film is at most 20 cN/cm;

• preferably at most 15 cN/cm, more preferably at most 12.5 cN/cm, even more preferably at most 10 cN/cm, most preferably at most 7.5 cN/cm, and in particular at most 5.0 cN/cm;
• preferably determined according to FINAT 10.

The release film according to any one of the preceding claims, wherein the release force of the release film along the measuring section has a variance of at most 6.0 cN2/cm2;

• preferably at most 3.0 cN2/cm2, more preferably at most 1.5 cN2/cm2, even more preferably at most 0.8 cN2/cm2, most preferably at most 0.4 cN2/cm2, and in particular at most 0.2 cN2/cm2;
• preferably determined according to FINAT 10.

The release film according to any one of the preceding claims, wherein the release force of the release film over multiple measurements has a variance of at most 6.0 cN2/cm2;

• preferably at most 3.0 cN2/cm2, more preferably at most 1.5 cN2/cm2, even more preferably at most 0.8 cN2/cm2, most preferably at most 0.4 cN2/cm2, and in particular at most 0.2 cN2/cm2;
• preferably determined over at least two measurements, more preferably at least three measurements, even more preferably at least four measurements, most preferably at least five measurements, and in particular at least six measurements;
• preferably determined according to FINAT 10.

The release film according to any one of the preceding claims, wherein the release force of the release film over the entire surface coated using the release coating has a variance of at most 16 cN2/cm2;

• preferably at most 8.0 cN2/cm2, more preferably at most 4.0 cN2/cm2, even more preferably at most 2.0 cN2/cm2, most preferably at most 1.0 cN2/cm2, and in particular at most 0.5 cN2/cm2;
• preferably determined according to FINAT 10.