Laser-engravable pad printing plate
AssigneeFlint Group Germany GmbH
InventorsMarkus Mühlfeit, Alfred Leinenbach, Jochen Unglaube
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Abstract
A laser-engravable pad printing plate comprising at least (a) a metal support, (b) an adhesion layer, (c) a laser-engravable recording layer having a layer thickness of 20 μm to 200 μm, (d) a cover film, characterized in that the laser-engravable recording layer (c) comprises (c1) 40 to 95 wt % of a polyvinyl alcohol, (c2) 5 to 50 wt % of an IR absorber, (c3) 0 to 30 wt % of an inorganic filler, (c4) 0 to 20 wt % of a crosslinker, and (c5) 0 to 10 wt % of further additives.
Claims15
A laser-engravable pad printing plate comprising:
- (a) a metal support,
- (b) an adhesion layer,
- (c) a laser-engravable recording layer having a layer thickness of 20 μm to 200 μm obtained from a mixture comprising
- (c1) 40 to 95 wt % of a polyvinyl alcohol,
- (c2) 5 to 50 wt % of an IR absorber,
- (c3) 0 to 30 wt % of an inorganic filler,
- (c4) 0.1 to 20 wt % of a crosslinker, and
- (c5) 0 to 10 wt % of further additives,
- (d) a cover film,
- wherein the crosslinker (c4) is selected from the group consisting of polyfunctional isocyanates, mono- or polyfunctional aldehydes, polyfunctional epoxides, polyfunctional carboxylic acids and polyfunctional carboxylic anhydrides;
- and
- wherein the laser-engravable recording layer is obtained in a process comprising chemically crosslinking the crosslinker with the polyvinyl alcohol.
A method for producing a pad printing plate comprising:
- (a) a metal support,
- (b) an adhesion layer,
- (c) a laser-engravable recording layer having a layer thickness of 20 μm to 200 μm,
- (d) a PET cover film,
- wherein the laser-engravable recording layer (c) is made from a mixture which comprises
- (c1) 40 to 95 wt % of a polyvinyl alcohol,
- (c2) 5 to 50 wt % of an IR absorber,
- (c3) 0 to 30 wt % of an inorganic filler,
- (c4) 0.1 to 20 wt % of a crosslinker, and
- (c5) 0 to 10 wt % of further additives,
- wherein the laser-engravable recording layer is obtained by a process comprising chemically crosslinking the crosslinker with the polyvinyl alcohol;
- the method comprising steps (i) to (iii):
- (i) coating the metal support with the adhesion layer,
- (ii) applying the laser-engravable recording layer to the PET cover film and drying the recording layer in one or more steps,
- (iii) laminating the coated PET cover film onto the metal support coated with the adhesion layer;
- wherein the crosslinker (c4) is selected from the group consisting of polyfunctional isocyanates, mono- or polyfunctional aldehydes, polyfunctional epoxides, polyfunctional carboxylic acids and polyfunctional carboxylic anhydrides.
A laser-engravable pad printing plate comprising:
- (e) a metal support,
- (f) an adhesion layer,
- (g) a laser-engravable recording layer having a layer thickness of 20 μm to 200 μm obtained from a mixture comprising
- (c6) 40 to 95 wt % of a polyvinyl alcohol,
- (c7) 5 to 50 wt % of an IR absorber,
- (c8) 0 to 30 wt % of an inorganic filler,
- (c9) 0.1 to 20 wt % of a crosslinker, and
- (c10) 0 to 10 wt % of further additives,
- (h) a cover film,
- wherein the crosslinker (c4) is selected from the group consisting of mono- or polyfunctional aldehydes, polyfunctional epoxides, and polyfunctional carboxylic anhydrides;
- wherein the laser-engravable recording layer is obtained by a process comprising chemically crosslinking the crosslinker with the polyvinyl alcohol.
Dependencies are inferred from the claim text.