KR20090083447A - Iridescent films with multiple reflection peaks - Google Patents

Abstract

The invention is directed to laminated multilayered films which generate unique color via two distinct reflection peaks. Each multilayered iridescent film has a dominant wave length reflective band which is different from the other multilayered film laminated thereto. The present iridescent film may be used in flexible and rigid decorative packaging. ® KIPO & WIPO 2009

Description

Iridescent film with multiple reflection peaks {IRIDESCENT FILMS WITH MULTIPLE REFLECTION PEAKS}

The present invention relates to an iridescent film having a plurality of reflective peaks with unique colors and effects.

In general, the present invention relates to multilayer coextruded light-reflective films having narrow reflecting zones due to light interference. If these reflecting zones occur within the visible wavelength range, the film is iridescent. Similarly, if the reflector falls outside the visible wavelength range, the film will reflect ultraviolet or infrared light. Such multilayer films and methods of producing them are known in the art. These are described, for example, in US Pat. Nos. 3,565,985, 3,759,657, 3,773,882 and 3,801,429 and other patents.

The multilayer film consists of a plurality of substantially parallel layers of transparent thermoplastic resin material, with adjacent neighboring layers having various resin materials that differ in refractive index by at least about 0.03. The film comprises at least 10 layers, more generally at least 35 layers, preferably at least about 70 layers.

The individual layers of the film are generally very thin, in the range of about 30 to 500 nm, preferably about 50 to 400 nm, causing constructive interference in the light waves reflected from the multiple interfaces. Depending on the layer thickness and refractive index of the polymer, one major wavelength band is reflected and the remaining light passes through the film. The reflected wavelength is proportional to the sum of the optical thicknesses of the pair of layers.

The amount of reflected light (reflectance) and color intensity depend on the difference in the two refractive indices, the ratio of the optical thicknesses of the layers, the number of layers and the uniformity of the thicknesses. If the refractive indices are the same, there is no reflection at all from the interface between the layers. In multilayer iridescent films, the refractive indices of adjacent neighboring layers differ by at least 0.03, preferably at least 0.06 or more. In the case of primary reflection, a moderately high reflectance is achieved when the ratio of the two optical thicknesses corresponds to 5:95 to 95: 5, but the reflectance is at its highest when the optical thicknesses of the layers are the same. Separate color reflections are obtained in only about 10 layers. However, it is required to have 35 to 1,000 or even more layers for maximum color intensity. High color intensity is relatively narrow and is associated with reflectors with high reflectivity at peak. Although the term "color intensity" is used herein for convenience, it should be appreciated that the same criteria apply to invisible reflection in the ultraviolet and infrared ranges.

Multilayer films can be produced by cold-roll casting techniques using conventional single manifold flat film dies with feedblocks that collect the melt from each of the two or more extruders and align it into a predetermined layer pattern. The number of layers and their thickness distribution can be changed by inserting various feedblock modules. In general, the outermost or outermost layers on each side of the sheet are thicker than the other layers. Such thicker skin may consist of one of the components that make up the optical core; May be a variety of polymers used to impart desirable mechanical, thermal sealing or other properties; Or a combination thereof.

Some recent developments in iridescent films are described in US Pat. 31,780, 4,937,134 and 5,089,318. US Patent Re. 31,780 describes the use of thermoplastic terephthalate polyesters or copolyester resins as the high refractive index component of the system. The formation of elastomeric interference films is described in US Pat. No. 4,937,134, wherein all resinous materials are certain thermoplastic polyurethanes, polyester block amides or flexible copolyesters. US Pat. No. 5,089,318 discloses that adjacent neighboring layers have a variety of transparent thermoplastic materials having different refractive indices that differ by about 0.03 or more, wherein at least one of the resin materials has at least 10 generally parallel layers that are engineering thermoplastic elastomeric resins. A multilayer light-reflective transparent thermoplastic resin film is disclosed.

Conventional multi-nanolayer films designed for optical and decorative purposes have a continuous layer of color-generating polymer pairs. This design maximizes the transparency of the structure to help constructive interference of incident light through the optical core.

For certain applications, it is desirable to maximize the reflection of the desired wavelength and to minimize any lightcasting effects. This can be evidenced by the lamination of conventional rainbow colored films on black substrates, where the reflective color is at its maximum. However, this effect is limited to one surface. In order to achieve the same effect on both sides, another film laminated to the surface is needed, which increases the overall cost and complexity of the effect.

Moreover, the laminated film of the prior art exaggerates the poor color uniformity across the web, and as a result, the color which is considered bad has been produced. Other prior art used higher order films that produce a plurality of reflective peaks that are generally weaker than the primary peak and very difficult to control.

summary

The present invention relates to a laminated film that produces a distinctive color by two distinct reflection peaks. These multiple peak rainbow films travel in a unique manner through the L ^* a ^* b ^* color space to produce new and interesting colors. As the short wavelength reflected peaks move from blue to purple and then to transparent (ultraviolet), conventional rainbow colored films simply exhibit all colors. With the plurality of reflection peaks, the longer wavelength peaks continue to produce color as the short wavelength reflection peaks disappear from the field of view. By adjusting the reflection wavelength, complex colors such as magenta, gold, cyan and the like can be produced with a single standard feed ring.

The phrase "almost parallel layer" as used herein means that neighboring layers generally remain in the X-Y plane, and z-direction movement is minimal or not present at all.

Multilayer coextrusion iridescent films per se are known in the art. US Patent Nos. 31,780 (Cooper, Shetty and Pinksy) and US Pat. Nos. 5,089,318 (Shetty and Cooper) and 5,451,449 (Shetty and Cooper) and other patents incorporated herein by reference. Iridescent films have very thin layers of at least 10, preferably at least about 35, more preferably at least about 70, as described in the literature, each of which is generally about 30 to 500 nm, more preferably about It is in the range of 50 to 400 nm, the layers are generally parallel, and adjacent neighboring layers are transparent thermoplastic coextruded laminated films having various transparent thermoplastic resin materials that differ in refractive index by at least about 0.03, more preferably at least about 0.06. The outermost layers of the films constituting the skin, when present, are each at least about 5% of the total thickness of the film.

Therefore, any thermoplastic resin material used to produce an iridescent film can be used in the present invention as long as each material has the features described above and the combination of the predetermined resin materials has the features described above. Useful polymers for the film layer include polyesters, polyacrylates, polyethylene vinyl acetates, polyolefins and polystyrenes. For example, polyesters include polyethylene terephthalate, polybutylene terephthalate, glycol-modified polyethylene terephthalate produced from ethylene glycol, and cyclohexamethanethanol characterized by a refractive index of about 1.55 to 1.61, and herein Polyethylene naphthalate as disclosed in US Pat. No. 6,475,608, which is assigned to the present applicant, which is incorporated by reference. Useful polyacrylates include polymethyl methacrylate. Non-limiting examples of useful films include alternating layers of polybutylene terephthalate (hereinafter "PBT") and polymethyl methacrylate ("PMMA"); Alternating layers of polyethylene terephthalate (PET) and polymethyl methacrylate; Alternating layers of polystyrene and ethylene vinyl acetate (hereinafter “EVA”); Alternating layers of polyethylene naphthalate and polymethyl methacrylate; Alternating layers of polyethylene terephthalate and ethylene methyl acrylate (hereinafter “EMA”); And alternating layers of polyethylene naphthalate and polymethyl methacrylate. As taught in US Pat. No. 5,451,449, assigned to the applicant, the layer may be colored or tinted. Table 1 below details additional polymers that can be used to form the films of the present invention.

Table 1

Polymer name Refractive index approximation

Poly (tetrafluoroethylene-co-hexafluoropropylene) 1.338

Poly (pentadecafluorooctyl acrylate) 1.339

Poly (tetrafluoro-3- (heptafluoropropoxy) propyl acrylate) 1.346

Poly (tetrafluoro-3- (pentafluoroethoxy) propyl acrylate) 1.348

Poly (tetrafluoroethylene) 1.35 (-1.38)

Poly (Undecafluorohexyl Acrylate) 1.356

Poly (nonnafluoropentyl acrylate) 1.360

Poly (tetrafluoro-3- (trifluoromethoxy) propyl acrylate) 1.360

Poly (pentafluorovinyl propionate) 1.364

Poly (heptafluorobutyl acrylate) 1.367

Poly (trifluorovinyl acetate) 1.375

Poly (octafluoropentyl acrylate) 1.380

Poly (pentafluoropropyl acrylate) 1.385

Poly (2- (heptafluorobutoxy) ethyl acrylate) 1.390

Poly (2,2,3,4,4,4-hexafluorobutyl acrylate) 1.392

Poly (trifluoroethylacrylate) 1.407

Poly (2- (1,1,2,2-tetrafluoroethoxy) ethyl acrylate) 1.412

Poly (trifluoroisopropyl methacrylate) 1.4177

Poly (2,2,2-trifluoro-1-methylethyl methacrylate) 1.4185

Poly (2- (trifluoroethyloxy) ethyl acrylate) 1.419

Poly (trifluorochloroethylene) 1.42-1.43

Poly (vinylidene fluoride) 1.42

Poly (dimethylsilylene (poly (dimethyl siloxane)) 1.43

Poly (trifluoroethyl methacrylate) 1.437

Poly (oxypropylene) 1.4495

Poly (vinyl isobutyl ether) 1.4507

Poly (vinyl ethyl ether) 1.4540

Poly (oxyethylene) 1.4563

Poly (vinyl butyl ether) 1.4563

Poly (vinyl pentyl ether) 1.4581

Poly (vinyl hexyl ether) 1.4591

Poly (4-methyl-1-pentene) 1.459-1.465

Cellulose acetate butyrate 1.46-1.49

Poly (4-fluoro-2-trifluoromethylstyrene) 1.46

Poly (vinyl octyl ether) 1.4613

Poly (vinyl 2-ethylhexyl ether) 1.4626

Poly (vinyl decyl ether) 1.4628

Poly (2-methoxyethyl acrylate) 1.463

Poly (butyl acrylate) 1.4631

Poly (butyl acrylate) 1.466

Poly (t-butyl methacrylate) 1.4638

Poly (vinyl dodecyl ether) 1.4640

Poly (3-ethoxypropyl acrylate) 1.465

Poly (oxycarbonyl tetramethylene) 1.465

Poly (vinyl propionate) 1.4665

Poly (vinyl acetate) 1.4665

Poly (vinyl methyl ether) 1.467

Poly (ethyl acrylate) 1.4685

Poly (ethylene-co-vinyl acetate) 1.47-1.50

(30% -20% vinyl acetate)

Cellulose propionate 1.47-1.49

Cellulose Acetate Propionate 1.47

Benzyl Cellulose 1.47-1.58

Phenolic-Formaldehyde Resin 1.47-1.70

Cellulose triacetate 1.47-1.48

Poly (vinyl methyl ether) (isotactic) 1.4700

Poly (3-methoxypropyl acrylate) 1.471

Poly (2-ethoxyethyl acrylate) 1.471

Poly (methyl acrylate) 1.472-1.480

Poly (isopropyl methacrylate) 1.4728

Poly (1-decene) 1.4730

Poly (propylene) (Atactic, Density 0.8575 g / cm 3) 1.4735

Poly (vinyl sec-butyl ether) (isotactic) 1.4740

Poly (dodecyl methacrylate) 1.4740

Poly (oxyethyleneoxysuccinoyl) 1.4744

(Poly (ethylene succinate))

Poly (tetradecyl methacrylate) 1.4746

Poly (ethylene-co-propylene) (EPR-rubber) 1.4748-1.48

Poly (hexadecyl methacrylate) 1.4750

Poly (vinyl formate) 1.4757

Poly (2-fluoroethyl methacrylate) 1.4768

Poly (isobutyl methacrylate) 1.477

Ethyl cellulose 1.479

Poly (vinyl acetal) 1.48-1.50

Cellulose acetate 1.48-1.50

Cellulose tripropionate 1.48-1.49

Poly (oxymethylene) 1.48

Poly (vinyl butyral) 1.48-1.49

Poly (n-hexyl methacrylate) 1.4813

Poly (n-butyl methacrylate) 1.483

Poly (ethylidene dimethacrylate) 1.4831

Poly (2-ethoxyethyl methacrylate) 1.4833

Poly (oxyethyleneoxy male oil) 1.4840

(Poly (ethylene maleate))

Poly (n-propyl methacrylate) 1.484

Poly (3,3,5-trimethylcyclohexyl methacrylate) 1.485

Poly (ethyl methacrylate) 1.485

Poly (2-nitro-2-methylpropyl 1.4868

Methacrylate) 1.4889

Poly (triethylcarvinyl methacrylate)

Poly (1,1-diethylpropyl methacrylate) 1.4889

Poly (methyl methacrylate) 1.4893

Poly (2-decyl-1,3-butidaene) 1.4899

Poly (vinyl alcohol) 1.49-1.53

Poly (ethyl glycolate methacrylate) 1.4903

Poly (3-methylcyclohexyl methacrylate) 1.4947

Poly (cyclohexyl α-ethoxyacrylate) 1.4969

Methyl Cellulose (Low Viscosity) 1.497

Poly (4-methylcyclohexyl methacrylate) 1.4975

Poly (Decamethylene Glycol Dimethacrylate) 1.4990

Poly (urethane) 1.5-1.6

Poly (1,2-butidaene) 1.5000

Poly (vinyl formal) 1.50

Poly (2-Bromo-4-trifluoromethylstyrene) 1.5

Cellulose nitrate 1.50-1.514

Poly (sec-butyl α-chloroacrylate) 1.500

Poly (2-heptyl-1,3-butidaene) 1.5000

Poly (ethyl α-chloroacrylate) 1.502

Poly (2-isopropyl-1,3-butidaene) 1.5028

Poly (2-methylcyclohexyl methacrylate) 1.5028

Poly (propylene) (density 0.9075 g / cm 3) 1.5030

Poly (isobutene) 1.505-1.51

Poly (bornyl methacrylate) 1.5059

Poly (2-t-butyl-1,3-butidaene) 1.5060

Poly (ethylene glycol dimethacrylate) 1.5063

Poly (cyclohexyl methacrylate) 1.5066

Poly (cyclohexanediol-1,4-dimethacrylate) 1.5067

Butyl Rubber (Uncured) 1.508

Poly (tetrahydrofurfuryl methacrylate) 1.5096

Beaten Perca 5 1.509

Poly (ethylene) ionomer 1.51

Poly (oxyethylene) (high molecular weight) 1.51-1.54

Poly (ethylene) (density 0.914 g / cm 3) 1.51

(Density 0.94-0.945 g / cm 3) 1.52-1.53

(Density 0.965 g / cm 3) 1.545

Poly (1-methylcyclohexyl methacrylate) 1.5111

Poly (2-hydroxyethyl methacrylate) 1.5119

Poly (vinyl chloroacetate) 1.512

Poly (butene) (isotactic) 1.5125

Poly (vinyl methacrylate) 1.5129

Poly (N-butyl-methacrylamide) 1.5135

Beat Perca (α) 1.514

Terpene Resin 1.515

Poly (1,3-butidaene) 1.5154

Shellac 1.51-1.53

Poly (methyl α-chloroacrylate) 1.517

Poly (2-chloroethyl methacrylate) 1.517

Poly (2-diethylaminoethyl methacrylate) 1.5174

Poly (2-chlorocyclohexyl methacrylate) 1.5179

Poly (1,3-butidaene) (35% cis; 56% trans; 7% 1,2-content) 1.5180

Natural rubber 1.519-1.52

Poly (allyl methacrylate) 1.5196

Poly (vinyl chloride) + 40% dioctyl phthalate 1.52

Poly (acrylonitrile) 1.52

                                                                 1.5187

Poly (methacrylonitrile) 1.52

Poly (1,3-butidaene) (high cis type) 1.52

Poly (butadiene-co-acrylonitrile) 1.52

Poly (methyl isopropenyl isetone) 1.5200

Poly (isoprene) 1.521

Poly (ester) resin, hard (about 50% styrene) 1.523-1.54

Poly (N- (2-methoxyethyl) methacrylamide) 1.5246

Poly (2,3-dimethylbutyadiene) (methyl rubber) 1.525

Poly (vinyl chloride-co-vinyl acetate) (95 / 5-90 / 10) 1.525-1.536

Poly (acrylic acid) 1.527

Poly (1,3-dichloropropyl methacrylate) 1.5270

Poly (2-Chloro-1- (chloromethyl) ethyl methacrylate) 1.5270

Poly (Acrolein) 1.529

Poly (1-vinyl-2-pyrrolidone) 1.53

Hydrogen Chloride Rubber 1.53-1.55

Nylon 6: Nylon 6,6: Nylon 6,10 (molded) 1.53

(Nylon-6-fiber: 1.515 transverse, 1.565 fiber direction)

Poly (butadiene-co-styrene) (about 30% styrene) 1.53

Black copolymer

Ethylene / Norbornene Copolymer 1.53

 Poly (cyclohexyl α-chloroacrylate) 1.532

Poly (2-Chloroethyl α-chloroacrylate) 1.533

Poly (butadiene-co-styrene) (about 75/25) 1.535

Poly (2-aminoethyl methacrylate) 1.537

Poly (furfuryl methacrylate) 1.5381

Protein 1.539-1.541

Poly (butylmercaptyl methacrylate) 1.5390

Poly (1-phenyl-n-amyl methacrylate) 1.5396

Poly (N-methyl-methacrylamide) 1.5398

Cellulose 1.54

Poly (vinyl chloride) 1.54-1.55

Urea Formaldehyde Resin 1.54-1.56

Poly (sec-butyl α-bromoacrylate) 1.542

Poly (cyclohexyl α-bromoacrylate) 1.542

Poly (2-bromoethyl methacrylate) 1.5426

Poly (dihydroabietic acid) 1.544

Poly (Abiate) 1.546

Poly (ethylmercaptyl methacrylate) 1.547

Poly (N-allyl methacrylamide) 1.5476

Poly (1-phenylethyl methacrylate) 1.5487

Poly (vinylfuran) 1.55

Poly (2-vinyltetrahydrofuran) 1.55

Poly (vinyl chloride) + 40% tricresyl phosphate 1.55

Epoxy Resin 1.55-1.60

Poly (p-methoxybenzyl methacrylate) 1.552

Poly (isopropyl methacrylate) 1.552

Poly (p-isopropylstyrene) 1.554

Poly (chloroprene) 1.554-1.558

Poly (oxyethylene) -α-benzoate-ω-methacrylate) 1.555

Poly (p, p'-xylyleneyl dimethacrylate) 1.5559

Poly (1-phenylallyl methacrylate) 1.5573

Poly (p-cyclohexylphenyl methacrylate) 1.5575

Poly (2-phenylethyl methacrylate) 1.5592

Poly (oxycarbonyloxy-1,4-phenylene-1-propyl 1.5602

Butylidene-1,4-phenylene)

Poly (1- (o-chlorophenyl) ethyl methacrylate) 1.5624

Poly (Styrene-co-maleic anhydride) 1.564

Poly (1-phenylcyclohexyl methacrylate) 1.5645

Poly (oxycarbonyloxy-1,4-phenylene-1,3-dimethylbutylidene-1,4-phenylene) 1.5671

Poly (methyl α-bromoacrylate) 1.5672

Poly (benzyl methacrylate) 1.5680

Poly (2-phenylsulfonyl) ethyl methacrylate) 1.5682

Poly (m-cresyl methacrylate) 1.5683

Poly (styrene-co-acrylonitrile) (about 75/25) 1.57

Poly (oxycarbonyloxy-1,4-phenyleneisobutylidene-1,4-phenylene) 1.5702

Poly (o-methoxyphenyl methacrylate) 1.5705

Poly (phenyl methacrylate) 1.5706

Poly (o-cresyl methacrylate) 1.5707

Poly (diallyl phthalate) 1.572

Poly (2,3-dibromopropyl methacrylate) 1.5739

Poly (oxycarbonyloxy-1,4-phenylene-1-methylbutylidene-1,4-phenylene) 1.5745

Poly (oxy-2,6-dimethylphenylene) 1.575

Poly (oxyethyleneoxy terephthaloyl (amorphous) 1.5750

(Poly (ethylene terephthalate)) (crystalline fiber: 1.51 transverse direction; 1.64 fiber direction)

Poly (vinyl benzoate) 1.5775

Poly (oxycarbonyloxy-1,4-phenylenebutylidene-1,4-phenylene) 1.5792

Poly (1,2-diphenylethyl methacrylate) 1.5816

Poly (o-chlorobenzyl methacrylate) 1.5823

Poly (oxycarbonyloxy-1,4-phenylene-sec-butylidene-1,4-phenylene) 1.5827

Poly (oxypentaerythritol oxyphthaloyl) 1.584

Poly (m-nitrobenzyl methacrylate) 1.5845

Poly (oxycarbonyloxy-1,4-phenyleneisopropylidene-1,4-phenylene) 1.5850

Poly (N- (2-phenylethyl) methacrylamide) 1.5857

Poly (4-methoxy-2-methylstyrene) 1.5868

Poly (o-methylstyrene) 1.5874

Poly (styrene) 1.59-1.592

Poly (oxycarbonyloxy-1,4-phenylenecyclohexylidene-1,4-phenylene) 1.5900

Poly (o-methoxystyrene) 1.5932

Poly (diphenylmethyl methacrylate) 1.5933

Poly (oxycarbonyloxy-1,4-phenyleneethylidene-1,4-phenylene) 1.5937

Poly (p-bromophenyl methacrylate) 1.5964

Poly (N-benzyl methacrylamide) 1.5965

Poly (p-methoxystyrene) 1.5967

Hard rubber (32% S) 1.6

Poly (vinylidene chloride) 1.60-1.63

Poly (sulfide) ("Thiokol") 1.6-1.7

Poly (o-chlorodiphenylmethyl methacrylate) 1.6040

Poly (oxycarbonyloxy-1,4- (2,6-dichloro) phenylene-1.6056

Isopropylidene-1,4- (2,6-dichloro) phenylene))

Poly (oxycarbonyloxybis (1,4- (3,5-dichlorophenylene)) 1.6056

Poly (pentachlorophenyl methacrylate) 1.608

Poly (o-chlorostyrene) 1.6098

Poly (phenyl α-bromoacrylate) 1.612

Poly (p-divinylbenzene) 1.6 150

Multilayer films are generally produced by a cold-roll casting technique that collects melts of thermoplastic material from two or more extruders by a feedblock that arranges a predetermined layered pattern. A very narrow multilayer stream flows through a single manifold flat film die so that the layers spread simultaneously along the width of the die and thin to the final die exit thickness. The number of layers and their thickness distribution can be varied using various feedblock modules. Suitable feedblocks are described, for example, in US Pat. Nos. 3,565,985 and 3,773,882. The feedblock is an alternating layer of two components (ie ABAB...); It can be used to form a three-component alternating layer (ABCABCA ... or ACBACBC ...) or more. In general, the outermost or outermost layers on each side of the sheet are thicker than the other layers to form a relatively thick skin. The resin material used to form the skin can be one of the components that produce the optical core, or of various polymers or combinations thereof used to impart desirable mechanical, thermal sealing, or other properties. Preferably, such films are produced by the method disclosed in US Pat. No. 3,801,429, which is incorporated herein by reference.

According to the present invention, a rainbow colored film having a distinctive color effect is achieved by stacking together two or more multilayer optical stacks as described above, wherein each optical stack has one major wavelength band reflected from the film. It features. Thus, the rainbow colored film of the present invention is characterized by having two or more reflection peaks. Two multilayer optical stacks with separate reflective peaks can be used to form the laminate film of the present invention, but it is also within the scope of the present invention to stack three or more multilayer optical stacks, each with a separate reflective peak. do. According to the present invention, each of the multilayer optical stacks has a separate reflection peak that differs by at least 25 nm from the reflection peaks of the other multilayer stacks or stacks. In addition, the difference in the wavelengths of the reflection peaks of each of the multilayer stacks forming the laminate of the present invention may be at least about 50 nm, 75 nm, 100 nm and 300 nm or more.

The manner in which each of the multilayer films are laminated or adhered to each other can vary and can be accomplished by methods well known in the lamination art. Thus, for example, the multilayer optical stack can be formed continuously as described above, and the individually formed optical stacks can still be combined in a molten state in a common feedblock. Alternatively, the multilayer optical stacks may be formed separately, cooled, and then laminated with a transparent adhesive disposed between each stack to form the multilayer film of the present invention. Transparent adhesives are known in the art and examples thereof include urethanes, epoxies and acrylics. Certain adhesives do not form part of the invention unless the adhesive is transparent and does not adversely affect the reflective peaks of the laminated film.

A problem with forming multi-layer films with distinct colors is the color uniformity of each optical stack used to produce the composite color. The iridescent composite color is very sensitive to changes in any optical stack that produce each reflection peak. Slight variations can produce very different reflective colors. Color uniformity of each optical stack is important for achieving the desired composite color. The development of a single peak rainbow colored reflective film with uniform color allows the actual blending of two or more separate reflective peaks to produce a new rainbow colored color that could not have been previously produced, and the resulting composite color is the overall web width. The color uniformity is satisfactory across. Methods of achieving color uniformity across the web are known and are currently practiced. In addition to uniaxial and biaxial orientation of the films, heat treatment of multilayer films has been used to improve color uniformity. Particularly useful films that can be used to form the laminated films of the present invention are manufactured under the trade name Tetoran MLF from Teijin-Dupont Films, Tokyo, Japan.

Usability: The present invention can be used in flexible and rigid decorative packaging. Flexible decorative packaging materials include, but are not limited to, wrapping paper, ribbons and bows. Rigid decorative packaging materials include cosmetic and personal care containers such as skin care products such as face masks, UV blocking lotions, liquid soaps and antibacterial products; Hair care products such as shampoos, conditioners, hair sprays or mordants and hair dyes; Makeup products such as nail polish, mascara, eye shadow and perfume; Shaving creams, deodorants, baby oils, and dental products. In addition, the films of the present invention can be used in printed and laminated boards for use in packaging. The invention may also be used in graphic applications, such as book covers. In addition, the film of the present invention is a type of vertical molding and filling packaging, which is a type of packaging device that feeds packaging films to a forming zone capable of thermal sealing in any of a variety of ways, and puts them in the packaging, and seals and closes them. Can be used for The dimensions of the finished package are determined by the width of the film fed to the machine, and the length of the bag is controlled by the speed and frequency settings at the sealing head. Various articles may be packaged in rainbow film pouches or bags in the same manner as described above. The invention can also be used in fashion accessories such as sequins and yarns. Also, the present invention can be used for wrapping picture frame profiles.

In addition, the present invention can reduce the size in certain ways to form glitter particles. These particles have various sizes and shapes depending on the application. Size ranges from very small to about 0.004 "to larger particles.

In addition, the film of the present invention can be used as a label for various containers. Such containers include cosmetic and personal care containers such as skin care products such as face masks, UV blocking lotions, liquid soaps and antibacterial products; Hair care products such as shampoos, conditioners, hair sprays or mordants and hair dyes; Makeup products such as nail polish, mascara, eye shadow and perfume; Shaving creams, deodorants and baby oils, and the like. The container may comprise special effect pigments such as titanium dioxide coated mica; Iron oxide coated mica; Iron oxide coated titanium dioxide coated mica as disclosed in US Pat. No. 4,146,403 to Louis Armanini et al., Assigned to the applicant; Iron oxide or titanium dioxide coated glass as disclosed in US Pat. No. 5,753,371 to William J. Sullivan et al., Assigned to the applicant; Platey metal oxides as disclosed in Carmine DeLuca et al., Assigned to U.S. Patent No. 5,611,851; Bismuth oxychloride special effect pigments as disclosed in US Pat. Nos. 6,572,695, 6,579,357 and 6,582,507 (Paul Cao) assigned to the applicant; Optically variable pigments as disclosed in US Pat. Nos. 6,325,847 and 6,440,208 (James D. Christie et al.) Assigned to the applicant; Dielectric reflectors of US Pat. No. 6,132,873; A substrate coated with silicon dioxide followed by iron oxide or titanium dioxide; And a substrate coated with titanium dioxide or iron oxide followed by silicon dioxide; All cited herein as a whole; FIREMIST ^® pearlescent pigments (including sodium borosilicate and titanium dioxide) available from BASF Catalysts LLC; MAGNAPEARL ^® 1000 pearlescent pigments (including 70-80 wt% mica and 20-30 wt% titanium dioxide) available from BASF Catalysts LLC; (Containing titanium dioxide of 67-75 mica, 0.2-2.0% tin oxide and 25-31% by weight of the weight of the weight%) BASF cache Tallis tsu El MAGNAPEARL ^® 1100 pearlescent pigment, available from elssi; (Including 56.5 to 64.5 of titanium dioxide mica, 0.2-2.0% tin oxide and 35.5-41.5% by weight of the weight of the weight%) BASF cache Tallis tsu El MAGNAPEARL ^® 2100 pearlescent pigment, available from elssi; And plate-like titanium dioxide commercially available from BASF Catalysts LLC. The present invention can also be used on colored substrates, including transparent containers filled with coloring liquids.

The invention can also be used for thermal lamination to cardboard and other substrates. In this process, the film is fed to the nip as a complete web, where under heating and pressure the film can be permanently attached to a second substrate, such as cardboard. Such a method provides a cost-effective alternative to lamination processes that require the use of adhesive to form an interlayer bond.

Example 1

A composite of a multilayer coextrusion light-reflective film having a red interference color having a peak wavelength at 610 nm and a multilayer coextrusion light-reflective film having a purple interference color having a peak wavelength at 440 nm was used with an aqueous urethane adhesive. To produce a rainbow magenta color. It is not possible to obtain magenta colored films with one peak wavelength.

Example 2

A composite of a multilayer coextruded light-reflective film having a red interference color having a peak wavelength at 610 nm and a multilayer coextruded light-reflective film having a green interference color having a peak wavelength at 540 nm was used with an aqueous urethane adhesive. To produce a rainbow gold color.

Example 3

A composite of a multilayer coextruded light-reflective film having a green interference color having a peak wavelength at 540 nm and a multilayer coextruded light-reflective film having a purple interference color having a peak wavelength at 440 nm was used with an aqueous urethane adhesive. To produce a cyan tint.

The above implementation is calculated from the lamination of two commercially available rainbow colored films. In addition, optical modeling was performed to demonstrate the usefulness of the present invention. The following run was calculated using TFCalc to model the stacked structures possible.

Example 4 (model)

The model of this example is an optical equivalent to taking a multilayer coextrusion light-reflective film having a red interference color with a peak wavelength at 610 nm and combining it with an iridescent film with a peak wavelength of 650 nm. Here, the resulting tint is also red, but the combined film has a higher chromaticity than a single peak film.

Example 5 (model)

The model of this example is an optical equivalent to taking a multi-layer coextruded light-reflective film having a green interference color with a peak wavelength at 540 nm and combining it with an iridescent film with a peak wavelength of 750 nm. Here, the generated hue also becomes green at normal incidence since the second peak is out of the IR zone. Unlike a single peak green film that becomes colorless after passing purple at a larger angle of incidence, the combined film has an expanded color shift that is closer to red.

Example 6 (model)

The model of this example is an optical equivalent to taking a multi-layer coextruded light-reflective film with a purple interference color with a peak wavelength at 440 nm and combining it with an iridescent film with a peak wavelength of 700 nm. Here, the generated hue also becomes purple at normal incidence since the second peak is out of the IR zone. Unlike a single peak purple film that becomes colorless at a larger angle of incidence, the combined film shifts to red, orange and yellow.

Claims (9)

Rainbow film having a plurality of reflection peaks. The iridescent film of claim 1, wherein each optical stack has one major wavelength band reflected from the film. The iridescent film of claim 2, wherein each optical stack has a distinct reflection peak that is at least 25 nm different from the reflection peak of the other optical stack or stacks. 4. The iridescent film of claim 3, wherein each optical stack has a distinct reflection peak that is at least 50 nm different from the reflection peak of the other optical stack or stacks. The iridescent film of claim 4, wherein each optical stack has a distinct reflection peak that is at least 100 nm different from the reflection peak of the other optical stack or stacks. 6. The iridescent film of claim 5, wherein each optical stack has a distinct reflection peak that differs by at least 300 nm from the reflection peak of the other optical stack or stacks. The iridescent film of claim 2, wherein the multilayer optical stacks merge in a still molten state in a common feedblock. The rainbow film of claim 2 wherein the multilayer optical stacks are formed separately, cooled, and then laminated to the rainbow film with a clear adhesive disposed between each stack. The rainbow film of claim 8 wherein the transparent adhesive is selected from the group consisting of urethanes, epoxies and acrylics.