MULTILAYER POLYMER MATERIAL FOR LASER ENGRAVING AND METHOD OF PRODUCTION THEREOF Russian patent published in 2020 - IPC B32B27/20 B32B27/28 B32B27/40 B42D25/435 

FIELD: chemistry.

SUBSTANCE: invention relates to a multilayer polymer material for making articles using laser engraving or laser cutting, such as protective labels with indication of unauthorized exposure, stickers, tags, bearing information on the product. Multilayer polymer material comprises a self-supporting layer of polymer material, an adhesive layer and an anti-adhesion liner. Self-bearing layer of thermoplastic polymer material is formed from a mixture containing polymethyl methacrylate, polyol and isocyanate and a laser-sensitive additive and is further impregnated with a laser-sensitive additive of pigment particles having a gradient concentration near the face surface of the self-supporting layer of the polymer material. Effective thickness of the impregnated part of the self-supporting layer of the polymer material does not exceed 10 mcm at a total thickness of 50–100 mcm. Self-supporting layer of polymer thermoplastic material is formed by polymerisation of mixture containing polymethyl methacrylate with glass transition temperature of 105 °C and molecular weight of not less than 8,000 g/mol, polyol, isocyanate and a laser-sensitive additive applied on the foil roll for hot stamping, at temperature below the glass transition temperature of polymethylmethacrylate, while simultaneously impregnating said layer with an additional laser-sensitive additive of pigment particles by a thermodiffusion transfer of foil particles to obtain a gradient concentration of laser-sensitive particles near the face surface of the self-supporting layer of the polymer material. After lamination of the self-supporting layer of the thermoplastic polymer material, the base of the roll foil is separated with the adhesive and the antiadhesion liner. Material can be obtained in a single-step process and is suitable for release in rolls.

EFFECT: technical result consists in improvement of resistance to aggressive liquids, such as acids, alkalis, salt water, high temperatures without cracking of film, resistance to abrasion at increased cyclic loads, which provides reliable protection of article not lower than 2–3 points.

10 cl, 4 tbl, 2 dwg