Polymerized films with line texture or fingerprint texture

摘要

The present invention relates to a process for producing polymerized films with line texture or fingerprint texture or for producing substrates coated with polymerized films with line texture or fingerprint texture, to polymerized films, obtainable by this process, with line texture or fingerprint texture or substrates coated with polymerized films with line texture or fingerprint texture, to pigments obtainable by comminuting such films, to the use of such films, substrates or pigments as or in optical filter(s), polarizers, decorative media, forgeryproof markers, reflective media or for focusing light (in solar cells), to the use of such films as an antibacterial coating, to a forgeryproof marker which comprises such a film, and to a process for detecting forgeryproof markings.

主权项

1. A polymerized film with line texture, obtained by a process comprising:
(i) providing an optionally coated carrier film or an optionally coated substrate and optionally cleaning the carrier film or the substrate and/or generating a preferential direction on the film or substrate surface or on part of the film or substrate surface; (ii) applying a composition comprising at least one achiral nematic polymerizable monomer and optionally at least one dispersion medium to the film or substrate surface; where the composition comprises at least one achiral nematic polymerizable monomer which is polymerizable with UV light, the composition comprising the at least one achiral nematic polymerizable monomer which is polymerizable with UV light in an amount of at least 25% by weight, based on the total weight of the achiral nematic polymerizable monomers present in the composition;
wherein the composition does not contain any chiral polymerizable monomer; (iii) optionally aligning the composition applied in (ii) or part of the composition applied in (ii); (iv) at least partly removing the dispersion medium optionally present; (v) polymerizing the at least one monomer present in the composition under the action of UV light; (vi) optionally thermally aftertreating the product obtained in step (v); and (vii) optionally post-curing the product obtained in step (v) or (vi) under the action of UV light; with the proviso that step (vi) is carried out if step (v) is carried out at a temperature of below 60° C.; where line texture means a surface characteristic which appears, when viewed under a microscope from the top, as a system of substantially parallel lines or strips of infinite longitudinal extent.