JPWO2020229647A5

JPWO2020229647A5 -

Info

Publication number: JPWO2020229647A5
Application number: JP2021568216A
Authority: JP
Publication date: 2023-03-03

Claims

Inkjet printed flexible films including:
(a) a polymer film having a thickness in the range of 30-500 μm, and (b) at least one ink-receiving layer comprising inorganic particles and a binder;
(c) inkjet ink pigments;
Here, the ink-receiving layer (b) further comprises a polymerizable and/or crosslinkable monomeric or polymeric compound having at least one (meth)acrylate moiety, or a polymer crosslinked via the (meth)acrylate moiety. The pores of the layer contain more than 6% by weight based on the weight of the ink-receiving layer.

2. The flexible film of claim 1, wherein said polymer film (a) is non-porous and said at least one ink-receiving layer satisfies at least one of the following conditions:
(i) a microporous layer comprising pores having a diameter of 2 nm or more and less than 0.5 μm;
(ii) a microporous layer having a porosity ranging from at least 0.3 ml/g to 1.5 ml/g, preferably from 0.5 ml/g to 1.0 ml/g;
(iii) the weight ratio of inorganic particles to binder ranges from 2:1 to 20:1, preferably from 3:1 to 15:1;
(iv) The dry coating weight of the ink-receiving layer (b) is in the range of 5-30 g/m ² , preferably in the range of 8-25 g/m ² .

Flexible film according to claim 1 or 2, wherein the layer (b) comprises ink-jet ink pigments on its surface, preferably in the form of a pattern, image, design or picture.

the pigment of said ink is in intimate contact with a polymerizable and/or crosslinkable monomeric or polymeric compound having at least one (meth)acrylate moiety or a polymer crosslinked via a (meth)acrylate moiety; or just bonded thereby.

The flexible film according to any one of claims 1 to 4, wherein the inorganic particles satisfy at least one of the following:
(i) having a primary particle size of 5 nm to 100 nm;
(ii) having an aggregate particle size of 30-300 nm;
(iii) selected from the group consisting of boehmite, alumina and silica particles;
(iv) have a BET surface area of 100-350 m ² /g;

Said binder is selected from polyvinyl alcohol and polyvinyl alcohol derivatives, preferably boric acid, borates, glyoxal, glyoxylic acid, salts of glyoxylic acid as sodium or calcium salts, adipic hydrazides, ureaglyoxal resins or silanol groups The flexible film according to any one of claims 1 to 5, which is crosslinked by

The flexibility according to any one of claims 1 to 6, wherein the polymerizable and/or crosslinkable monomeric or polymeric compound having (meth)acrylate moieties or the crosslinked polymer satisfies at least one of the following: the film:
(i) present in an amount of 10 to 60% by weight based on the weight of the ink-receiving layer (b);
(ii) present throughout the ink-receiving layer (b);
(iii) said polymerizable and/or crosslinkable compound is polymerizable and/or crosslinkable by application of UV or electron beam irradiation;
(iv) said crosslinked polymer comprises said polymerized or crosslinked compound as a monomer.

A polymerizable and/or crosslinkable compound having at least one (meth)acrylate moiety is a mixture of (meth)acrylic acid and a mono- or polyhydric alcohol which may be ethoxylated or propoxylated. selected from monomers selected from esters or prepolymers and polymers selected from polyester acrylates, epoxy acrylates, urethane acrylates, amine-modified acrylates, silicone acrylates and (meth)acrylated poly(meth)acrylates; wherein preferably said monomer is isodecyl acrylate, cyclic trimethylolpropane formal acrylate, dihydrodicyclopentadienyl acrylate, 2-propylheptyl acrylate, 4-tert-butylcyclohexyl acrylate, ethyl diglycol acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, phenoxyethyl acrylate, 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), propoxylated neopentyl Glycol diacrylate, trimethylolpropane triacrylate (TMPTA), propoxylated glycerol triacrylate (GPTA), ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, amine-modified polyether acrylate, ethoxylated pentaerythritol Tetraacrylate (PPTTA); trimethylpropane formal monoacrylate, phenoxyethyl acrylate, 4-t-butylcyclohexyl acrylate, tripropylene glycol diacrylate, oxyethylated phenol acrylate, monofunctional epoxy acrylate, phenoxyethyl acrylate, isobornyl acrylate (IBOA ), octyl and decyl acrylate (ODA), polyethylene glycol 600 diacrylate, tricyclodecanediol diacrylate, propoxylated neopentyl glycol diacrylate, bisphenol A derivative diacrylate, trimethylolpropane ethoxy triacrylate, nonylphenol [4EO] acrylate , acrylated epoxy soybean oil, bisphenol A epoxy acrylates, trimethylpropane trimethacrylate (TMPTMA), isobornyl methacrylate, polyethylene glycol (200) dimethacrylate, lauryl methacrylate, acid-functional acrylates, isocyanatoacrylates having isocyanate groups and acrylic groups in one molecule, dipentaerythritol penta / hexaacrylate (DPHA), dipentaerythritol hexaacrylate, trimethylpropane formal monoacrylate, 2-phenoxyethyl acrylate, 4-t-butylcyclohexyl acrylate, tripropylene glycol diacrylate, tris(2-hydroxyethyl) isocyanurate triacrylate , ethoxylated 2-phenoxyethyl acrylate, ethoxylated (4) nonylphenol acrylate, ethoxylated trimethylolpropane triacrylate, and polyester acrylates, epoxy acrylates, urethane acrylates, amine-modified polyether acrylates or silicone acrylates. Oligomers or prepolymers are preferably aliphatic urethane acrylates, OH-functionalized aliphatic urethane acrylates, polyester acrylates, amine-modified polyether acrylates, polyether tetraacrylates, epoxy acrylates, silicone diacrylates, silicone hexaacrylates, aliphatic polyurethanes acrylate, polyethylene glycol (200) dimethacrylate, polyethylene glycol (400) dimethacrylate, polyethylene glycol (600) dimethacrylate and polyethylene glycol (400) diacrylate and/or said crosslinked polymer is a monomer, an oligomer or as prepolymers, preferably selected from polyester (meth)acrylates, polyurethane (meth)acrylates, polyether (meth)acrylates, (meth)acrylated poly(meth)acrylates and mixtures thereof The flexible film according to any one of claims 1 to 7.

The polymer crosslinked via (meth)acrylate moieties is the product of radiation curing of at least one component having one or more isocyanato groups, or the polymer crosslinked via (meth)acrylate moieties is composed of reaction products of isocyanate-containing components and OH groups, wherein said OH groups are preferably OH groups of one or more of said polymerizable and/or crosslinkable compounds or OH groups of ink components The flexible film according to any one of the preceding claims, wherein the OH group is preferably a water-soluble ink humectant, most preferably a primary OH group.

A method of manufacturing a film according to any one of claims 1 to 9, comprising the steps of:
(i) coating a polymer film having a thickness in the range of 30-500 μm with a mixture comprising inorganic particles and a binder to provide at least one ink-receiving layer on the polymer film;
(ii) including or applying a polymerizable and/or crosslinkable compound having at least one (meth)acrylate moiety into the pores of the ink-receptive coating;

11. The method of claim 10, wherein the method further comprises an additional step (iii) and/or an additional step (iv):
(iii) polymerizing and/or cross-linking the (meth)acrylate compound contained in or applied to the ink-receiving layer by applying radiation energy to obtain a polymer cross-linked via the (meth)acrylate moieties; matter,
(iv) applying a water-based ink to the ink-receiving layer;
Here, step (iv) can be performed after step (i) and before step (ii) to prepare the printed flexible film.

12. The method of claim 10 or 11, wherein at least one of the following is satisfied:
(a) the ink-receiving layer is printed with a pigmented aqueous inkjet ink prior to step (ii);
(b) the polymerizable and/or crosslinkable compound is applied to the surface of the ink-receiving layer after drying the ink-receiving layer;
(c) radiation curing is carried out with UV radiation in the range of 300-3000 mJ/cm ² , preferably 500-2500 mJ/cm ² , preferably in an atmosphere containing less than 200 ppm oxygen;
(d) radiation curing is carried out by electron beam curing at a radiation dose in the range of 5 kGy to 200 kGy, preferably 10 to 100 kGy, preferably in an atmosphere containing less than 200 ppm oxygen;
(e) polymerization is initiated by UV light using a photoinitiator to form a polymer crosslinked through the (meth)acrylate moieties;
(f) polymers crosslinked via (meth)acrylate moieties are obtained by radiation curing of (meth)acrylates or reactive diluents containing (meth)acrylic monomers,
(g) the polymer crosslinked via (meth)acrylate moieties is obtained by radiation curing of at least one component having two or more (meth)acrylic moieties;
(h) polymers crosslinked via (meth)acrylate moieties are obtained by radiation curing of at least one component having one or more (meth)acrylic moieties and one or more isocyanato groups;
(i) The polymer crosslinked via (meth)acrylate moieties further comprises an isocyanate component which is thermally reactive or OH groups, preferably OH of one or more radiation curable components. groups or OH groups of ink components, preferably OH groups of water-soluble ink humectants, preferably primary OH groups.

Solvent-based, water-based or liquid undiluted compounds, wherein the polymerizable and/or crosslinkable compounds preferably have a viscosity of less than 1000 mPa ^* s, more preferably less than 500 mPa ^* s, even more preferably less than 300 mPa ^* s A method according to any one of claims 10 to 12, applied to the ink-receiving layer by use of a formulation.

Use of the flexible film according to any one of claims 1-10 for preparing laminates.

A multilayer laminate comprising the film of any one of claims 1-10, wherein said laminate is a flexible laminate, or the film of any one of claims 1-10. a rigid laminate comprising a rigid substrate, support, surface or object laminated with a multilayer laminate.