Printable film
The invention relates to printable films comprising a substrate and at least a surface layer, said layer covering at least one face of said substrate and comprising a water-dispersible polymer and an ethylenically unsaturated compound; to a process for the manufacture of such films; to printed films and especially to printed labels obtained from such printable films.
1. A printable film, comprising:
a substrate;
a surface layer covering a face of said substrate,
wherein said surface layer comprises:
10 to 98% by weight of a water dispersible polymer that provides a smooth film surface for printing; and
2 to 90% by weight of an ethylenically unsaturated compound that plasticizes said surface layer,
wherein said surface layer is printable with radiation curable ink and wherein said surface layer further comprises a cross-linking agent in an amount from 1 to 5% by weight of the water dispersible polymer and does not contain a polymerization photoinitiator and said ethylenically unsaturated compound does not react with said water-dispersible polymer when said surface layer is irradiated with UV radiation.
2. The printable film of claim 1 , wherein the substrate is selected from the group consisting of polymer films, polyolefin films, papers, synthetic papers, woven fabrics, nonwoven fabrics, ceramic sheets, metallic fiber sheets, metalized sheets (film), metallic foils, metallic plates, and multilayer composite sheets formed by combination of said materials.
3. The printable film of claim 2 , wherein the substrate is an oriented polypropylene film.
4. The printable film of claim 1 , wherein said water dispersible polymer forms a matrix and wherein said ethylenically unsaturated compound is included in said matrix and is present in an amount from 2% to 15% by weight of the water dispersible polymer.
5. The printable film of claim 1 , wherein said ethylenically unsaturated compound is an ester derivative of an α,β-ethylenically unsaturated acid with a polyol or alkoxylated polyol.
6. The printable film of claim 5 , wherein said α,β-ethylenically unsaturated acid is selected from the group consisting of acrylic acids, methacrylic acids, itaconic acids, citraconic acids, maleic acids, and fumaric acids.
7. The printable film of claim 1 , wherein said ethylenically unsaturated compound contains 1 to 10 ethylenical bonds per molecule.
8. The printable film of claim 1 , wherein said ethylenically unsaturated compound contains 2 to 5 ethylenical bonds per molecule.
9. The printable film of claim 1 , wherein said water dispersible polymer comprises a homopolymer of (meth)acrylic acid, or alkyl (meth)acrylate with the alkyl radical having 1 to 10 carbon atoms.
10. The printable film of claim 1 , wherein said water dispersible polymer comprises a copolymer of (meth)acrylic acid and alkyl (meth)acrylate with the alkyl radical having 1 to 10 carbon atoms.
11. The printable film of claim 1 , wherein said water dispersible polymer comprises a copolymer of vinylic or allylic compounds.
12. The printable film of claim 1 , wherein the water dispersible polymer comprises a urethane or urethane acrylate polymer.
13. The printable film of claim 1 , wherein said cross-linking agent comprises ammonium zirconium carbonate.
14. The printable film of claim 1 , wherein said water dispersible polymer is a urethane polymer which is not a polyurethane acrylate and wherein said urethane polymer provides a smooth film surface for printing.
15. The printable film of claim 1 , wherein said surface layer comprises a radiation curable ink.
16. The printable film of claim 1 , wherein said surface layer comprises an electron beam curable ink.