Patent ID: 11879081
Assignee: MONDI AG
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 19:
20. A process for producing the release liner according to claim 1, the process comprising the steps of:
(a) providing a roll;
(b) forming a network of channels into a surface of the roll and roughening the surface of the roll to produce a plurality of peaks in the surface, wherein the roughening is performed either before or after the formation of the network of channels, such that the surface of the roll resulting from step (b) is roughened at least between the channels and contains a plurality of peaks;
(c) providing a composite comprising:
the carrier substrate, and
the thermoplastic polymer layer being applied on one side of the carrier substrate;
(d) embossing the thermoplastic polymer layer with the roll obtained in step (b) in order to form the network of ridges and to roughen the surface of the thermoplastic polymer layer on the side opposite to the carrier substrate at least between the ridges resulting in the plurality of pits; and
(e) applying the release layer on the thermoplastic polymer layer obtained in step (d) on the side opposite to the carrier substrate to obtain the release liner,
wherein, in the release liner resulting from step (e), the thermoplastic polymer layer and the release layer include the network of ridges which result in the elevations of the surface of the release liner on the side of the release layer, and the surface on the side of the release layer is roughened at least between the ridges, such that it has the plurality of pits as defined in claim 1.