JPH05193062A - Film with surface tissue, its manufacture and color sheet for thermal transfer printing containing said film - Google Patents

Abstract

PURPOSE: To obtain surface texture which is designed to have suitable frictional characteristic and handling aptitude by adding a polymer or polymers on the surface texture and by making a supporting member not to stretch after coating is processed. CONSTITUTION: A film with a surface texture includes a polymer supporting member 1 having, at least on one surface of which, a coating with a surface texture made of setting material including at least one kind of polymer. This surface texture 3, shown here, is provided mainly by a kind of polymer or plural kinds of polymer themselves. The supporting member 1, moreover, is made not to stretch after coating is formed. The supporting member 1 itself is subject to uniaxial or preferably biaxial stretching, and the surface texture 3 is provided to the film only after the supporting member 1 is stretched. Thus stronger control works to a surface relief at the time of coating process.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a polymer film,
Especially with surface texture
d) A polymer film comprising a coating, and in particular a thermal transfer dye sheet comprising a textured backing.

[0002]

BACKGROUND OF THE INVENTION Textured films, such as membrane touch switches, which provide desirable friction / handlability, tactile and visual appeal in the commercial application arena.
ch) A demand for a protective light-shielding film for overlay sheets, an ink / pencil receptive film for drawing media, and a durable backing film for flexible data storage media (eg, optical data storage, magnetic tape, and magnetic-optical tape), There is also a need for thermal transfer printing dye sheets.

Dye sheets for thermal transfer printing are typically
It comprises a support having on one side a dye coating layer conventionally comprising a dye and a binder and on the other side a backing layer. In both thermal transfer printing applications, i.e., dye diffusion thermal transfer and laser thermal transfer, a dye sheet is placed in intimate contact with a receiver sheet, and selected areas of the dye sheet are selectively heated to accept the dye in the heated area. Promoting thermal transfer to the sheet, thus forming an image on the receiver sheet. The dye coating is customarily very smooth, allowing intimate contact between the dye coating on the dye sheet and the receiver sheet to which the image is to be transferred.

In the dye diffusion thermal transfer method, heating is performed by a thermal print head which is in contact with the back coating of the dye sheet. In the laser thermal transfer process, the dye coating is typically heated by a laser beam directed to heat the dye coating through the backing and the support.

GB-A-2113117 discloses a slippery coating having a coating which is a mixture of a metal (meth) acrylate having one (meth) acrylate functionality per organic moiety and a polymeric film-forming material or a monomer precursor. A biaxially oriented polyester film is disclosed. The aforementioned British Patent No. 2,113,117 also discloses a method of making such a film. The method includes the steps of coating the surface of a running polyester film before its crystallographic orientation is complete, and heating the coating before stretching of the film is complete. However, the textured coatings produced in this way may be stretched in the finish of the stretching of the polyester film, or may suffer from loss of adhesion to the support due to the shearing action between the coating and the support. There is.

[0006]

We have now invented a polymer film comprising a textured coating, preferably having a plurality of components, which overcomes or substantially eliminates the above-mentioned problems. did.

According to a first aspect of the invention, a textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one polymer. The texture is provided primarily by the polymer or polymers themselves, and yet the support is unstretched after forming the coating).

It is desirable to uniaxially or preferably biaxially stretch the support, but in both cases the surface texture is applied to the film after the support has been stretched.

The film according to the first aspect of the present invention is advantageous because the surface relief of the textured coating is not modified by stretching after its formation, thus allowing greater control over the surface relief during coating formation. .. Moreover, the adhesion of the textured coating to the support is retained because it does not stretch the film.

Stretching of the film following application of the textured coating is particularly advantageous by reducing the out-of-plane displacement of the coating, ie by "planarizing" the texture and thus reducing the surface roughness of the film. If the coating exhibits a low degree of crosslinking, it may modify the coating.

In many applications, such as thermal transfer printing, where handleability is important, surface roughness is a desirable property that the film should have.

Prior art films with low surface roughness can exhibit problems due to poor handleability in such applications.

According to a second aspect of the present invention, a textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a hardened material comprising at least one polymer. The texture is predominantly imparted by the polymer or polymers themselves, and the film is at least 0.05.
μm average surface roughness (Ra) is provided).

The film according to the second aspect of the invention has excellent handleability, abrasion resistance desirable for membrane contact switch applications,
It also exhibits desirable wear and winding properties for optical data storage applications.

In thermal transfer printing applications such films are particularly useful as backcoats for dye transfer sheets. The higher surface roughness of the textured backcoat reduces the likelihood of unwanted dye transfer from the smooth dyecoat to the backcoat of an adjacent sheet when the dyesheets are stacked.

Further, in thermal transfer printing, the textured backcoat promotes smooth transport of the dye sheet through the printer, and in dye diffusion transfer, blocking of the dye sheet against the printer head is reduced.

The use of polyfunctional (meth) acrylate (acrylate and / or methacrylate) ester organic polymers results in a textured coating with improved durability, thermal stability, hardness, and abrasion resistance. I found out that

According to a third aspect of the present invention, there is provided a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one multifunctional (meth) acrylate ester polymer. A textured film is provided, the texture being predominantly provided by the polymer or polymers themselves.

By "polyfunctional (meth) acrylate ester polymer" is meant an acrylate monomer that has more than one acrylate functionality per monomer and is polymerized to form a polymer.

"Monomer" means a true monomer and / or a curable oligomer / prepolymer.

The (meth) acrylate ester polymer is at least partially crosslinked due to the polyfunctionality of the monomers. This is advantageous compared to linear or non-crosslinked polymers as the polymers are less likely to soften at the elevated temperatures used for thermal transfer printing (typically above 250 ° C).

The textured coating of the film according to the third aspect of the present invention has advantageous abrasion resistance and thermal stability and thus provides an excellent backing for thermal transfer printing dye sheets.

The improved hardness of the textured coating of such films is beneficial in optical data storage tape products having a textured backing. This is because there is less deformation of the backcoat under the pressure that is encountered when the tape is wound on a spool.

The textured coating of a film according to the third aspect of the present invention has a polyfunctionality of at least 1% by weight, preferably 25-100% by weight, and especially 75-100% by weight, based on the curable components of the coating. Meto)
Suitably it comprises an acrylate ester polymer.

Furthermore, at least 10%, preferably 3
0-100%, and especially 50-100% of available (meth) acrylate double bonds are present in the coating, ie any polyfunctional (meth) acrylate ester and any other (meth) acrylate The components are also preferably converted to single bonds by curing the coating.

The degree of conversion is about 8 due to = CH ₂ twist.
It is measured using the FTIR absorption ratio by comparing the unsaturated peak at 10 cm ^-1 with the internal reference peak at 1158 cm ^-1 due to the CO stretching of the acrylic group. The absorption ratio of the cured coating, 810 cm ^-1 / 1158 cm ^-1 , is compared to that of the uncured coating to determine the degree of conversion.

The present invention also includes a textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one polymerizing component. Preferably also has been induced, at least in part, as a result of evaporation of said volatile vehicle from a coating formulation which comprises predominantly a volatile vehicle and unpolymerized components).

The present invention further provides a dye sheet for thermal transfer printing comprising a textured film according to the invention having a textured coating on one surface of the support and a dye layer on the other surface of the support. provide.

A further aspect of the present invention is the step of coating a polymeric support with a volatile vehicle solution or dispersion of material, drying the coating to remove at least a portion, preferably substantially all, of the volatile vehicle. Removing, wherein said material comprises at least one polymerizable component such that said drying step is effective to impart surface texture to the dried layer formed by coating the material, and said Provided is a method for producing a film with a surface texture, which comprises the step of curing a dry layer.

"With surface texture" means that most of the surface texture is
More preferably substantially all is due to the retraction of at least one component of the coating and / or the phase separation between at least two of said components if said coating comprises at least two components. , Means the surface texture of the surface layer of the cured coating on the film.

The textured coating is a conventional filler,
For example, it is desirable to be substantially free of silica and alumina for optical data storage applications. However, the presence of conventional fillers may be desirable in other applications, such as drafting film.

Prior to curing of the polymerizable component, coating shrinkage as a result of chemical treatments such as polymerization and crosslinking.
It is preferred that substantially no nkage) occur. If any such shrinkage of the coating occurs, it is preferred that it does not contribute substantially to the surface texture of the coating with respect to shrinkage and / or phase separation.

Suitably, the majority, preferably substantially all, of the surface texture of the coating is formed before the polymerizable component is cured.

The polymer or polymerizing component of the textured coating suitably comprises a metal (meth) acrylate and / or polymerizing monomer.

As described and used herein, the metal (meth) acrylate is preferably a polyvalent metal ion such as a transition metal ion such as zirconium, more preferably a divalent metal ion such as zinc, cobalt, nickel. , Or copper. Metal acrylates are generally preferred. A particularly preferred metal acrylate is zinc diacrylate. Amount of monomer,
Structure, molecular weight, and functionality can affect the surface relief and properties of the cured coating. The choice of monomer allows for coating requirements for specific applications, such as surface roughness; optical properties (eg, haze); mechanical properties (eg, abrasion resistance); flexibility; adhesion; solvent / chemical resistance; and The weather resistance can be optimized.

Suitably the monomer is a UV reactive species and more preferably a compound having (meth) acrylate functional groups. Particularly suitable monomers include (meth) acrylate ester monomers, urethane (meth) acrylate oligomers, and N-vinyllactam monomers.

Preferred (meth) acrylate ester monomers include (meth) acrylate esters having a plurality of (meth) acrylate groups, and particularly preferred are trimethylolpropane triacrylate (TMPTA) and ethoxylated TMPTA (TMPTE).
OA), tripropylene glycol diacrylate (T
PGDA), and dipentaerythritol monohydroxypentaacrylate (DPEPA).

Preferred (meth) acrylate oligomers include polyester (meth) acrylates and epoxy (meth) acrylates, particularly preferred are oligomeric (meth) acrylate thioethers,
For example, TMPTA- [S-TMPTA] n-S-TM
PTA (where n is 0-2, available from Rohm Gmbh under the trademark PLEX 6696-0), and urethane (meth) acrylates, especially aliphatic urethane (meth)
An acrylate oligomer may be used.

Preferred N-vinyl lactam monomers include N-vinyl pyrrolidone and N-vinyl caprolactam.

The monomer may also be a cationically cured epoxy compound such as a cycloaliphatic diepoxide,
For example, 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate available from Degussa under the trademark DEGACURE K126. In this case, it is desirable that cationic photoinitiators, such as triarylsulfonium salts, can also be present.

It is also possible to use mixtures of (meth) acrylate ester monomers and / or (meth) acrylate oligomers and / or N-vinyllactam monomers as monomers, in particular DPEPA and PLE.
Blends with X6696-0 can be used. Suitably, the N-vinyl lactam monomer, when present in the formulation, comprises up to 40% by weight of the formulation, preferably up to 30% by weight. Cationic cure epoxy compounds may be included in such monomer formulations.

The amount of monomers in the coating formulation is preferably in the range 0-9, over a wide range of total reactive components.
It can range from 5% by weight, more preferably from 60 to 90% by weight, and especially from 66 to 85% by weight.

If the coating formulation comprises a metal (meth) acrylate, especially zinc diacrylate, and the monomer, the solvent is removed, for example by drying, and the metal (meth) acrylate separates from the monomer to form a two-phase system. Form. The surface relief of the resulting surface coating is
It depends on the ratio of salt to monomer. At certain ratios, the surface relief can be described as a discontinuous metal (meth) acrylate phase or ionomer phase embedded in a continuous polymer phase. Depending on the compatibility of the metal (meth) acrylate with the monomer, some monomers may be incorporated into the ionomer phase and / or some metal (meth) acrylate may be incorporated into the polymer phase Is.

The presence of the monomer in the coating formulation results in improved durability of the resulting textured coating.

To ensure phase separation, a coating component is suitably added which is substantially incompatible with at least one other component of the formulation and preferably with all components of the formulation. It can also be contained in the product.

Suitable polymer components include high molecular weight epoxy polymers which are soluble in the medium to which the textured coating can be applied and which preferably have a molecular weight of 1000 to 5000, more preferably 3000 to 4000. Suitable examples include bisphenol A epichlorohydrin condensates (eg epoxy resin with trademark EPIKOTE 1009 available from Shell) and cellulosic polymers (eg cellulose acetate).

The amount of polymer component in the coating formulation can range over a wide range and is determined by the application for which the film is required. The polymer component can be present in an amount of up to 90% by weight of the total reactive components, preferably 1-80% by weight and especially 20-60% by weight.

The polymerizable component is conventionally applied to the support in a coating medium which comprises a solution or dispersion of the polymerizable component in a suitable volatile vehicle, especially an organic solvent or dispersion medium. The volatile vehicle is then
By suitably drying and evaporating the vehicle,
Can be removed.

Suitable organic media include common solvents such as acetone, tetrahydrofuran, and preferably those exhibiting hydrogen bonding capacity (eg alcohols, especially methanol), or any combination thereof.

Deposition of the polymerizable component solution or dispersion onto the polymer support is accomplished by conventional film coating techniques such as gravure roll coating, reverse roll coating, dip coating, bead coating, slot coating, or electrostatic spray coating. Done. The solution or dispersion has a dry thickness of the applied layer of about 25 μm or less, for example, 0.1 to 20.
It is suitable to apply in an amount so as to be in the range of μm, preferably 0.5 to 20 μm.

The thickness of the layers applied is appropriately determined depending on the particular application for which the film is to be used, for example:
The applied layer thickness is preferably 1 to 20 μm, more preferably 2 to 10 μm for membrane contact switch applications, and preferably 5 μm for optical data storage applications.
m or less, especially 0.5 to 4 μm.

The degree of surface texture obtained can be controlled by changing the drying rate of the polymerizable component layer,
For example, zinc diacrylate, such as rapid drying (100 ℃
1 minute), a regular microcrystalline structure can be produced to give the coated film a surface texture and a light scattering property.

A nucleating agent may be present in the coating formulation to help provide the sites in the substantially uncured coating where the polymerizable component may crystallize.
A suitable nucleating agent may already be present in the polymerizable component, such as a commercial grade zinc diacrylate known to contain small amounts of a substance that is insoluble in a suitable coating solvent (eg, methanol). There is a nature. Preliminary analysis showed that this material was partially polymerized zinc diacrylate and / or zinc stearate.
When preparing a solution of commercially available zinc diacrylate (for example, industrial grade zinc diacrylate manufactured by Rohm) with methanol, a part of the high molecular weight substance (about 0.1% by weight based on the amount of zinc diacrylate) Remains as a colloidal dispersion in the solution for several days. The colloidal component aids in the formation of surface texture, remains stable in the coating solution, and can be evenly distributed within the coating layer after drying.

If a polymerizable component which does not contain a suitable nucleating agent is used, the coating formulation may include a nucleating agent such as silica (preferably amorphous silica) or carbon black (both from Degussa under the tradename AEROSIL respectively).
(Available from TT600 and PRINTEX XE2) may need to be added.

Once the solvent has been removed from the polymerizable component layer, it is necessary to cure the layer to fix the surface texture created during solvent removal control. Suitable curing methods include, for example, electron beam curing; preferably thermal initiators, especially inorganic or organic peroxides (eg benzoyl peroxide) and azo compounds (eg
Polymerization of the polymerizable component by thermal curing using a thermal radical initiator such as 2,2'-azobisisobutyronitrile) is included, but photopolymerization is preferred.

Photopolymerization provides high intensity ultraviolet (UV) light using, for example, a mercury arc lamp, preferably a medium pressure mercury arc lamp, which provides UV light having a wavelength of about 240 to about 370 nm, preferably 260 to 370 nm. Appropriately achieved by irradiating the solvent-free polymerizable component layer. UV curing can be done in air, or in an inert atmosphere such as nitrogen if necessary to increase the cure rate, for example.

The initiation of photopolymerization can be carried out in the presence of photoinitiators, and a wide range of photoinitiators is commercially available, especially for systems comprising polymerizable components. The photoinitiator is incorporated in an amount of preferably 0.1 to 20% by weight, more preferably 2 to 12% by weight of the total reactive components.

Suitable photoinitiators include benzoin, benzoin alkyl ethers, benzyl ketals, acetophenone derivatives (eg dialkylacetophenones, dichloroacetophenones, and trichloroacetophenones), and especially IRGACURE 651 and IRGACU.
RE907 (both commercially available from Ciba Geigy)
Is included.

If desired, a supercoat can be applied to the textured coating of the film according to the invention to provide protection. In order to retain the surface relief benefit of the textured coating, it is highly desirable to apply the supercoat along the contours of the surface relief and in a layer of substantially uniform thickness.

Low surface energy, preferably 44 dyne
It has been found that supercoats having a density of less than / cm, more preferably less than 36 dyne / cm, and especially in the range of 16 to 36 dyne / cm are particularly advantageous. Such a supercoat reduces the affinity of the film for the opposite side of the supercoat.

Supercoats having a low surface energy may include hydrocarbon waxes, silicone-based polymers / prepolymers, preferably silicone-based (meth) acrylates (eg, Ebecryl 13 available from Union Carbide).
60) and / or a fluorinated polymer / prepolymer (eg 2,2,3,3-tetrafluoropropyl methacrylate commercially available from Rohm GmbH).

The thickness of the supercoat depends on the application for which the film is produced, but is preferably in the range from 1 nm to 2 μm, and especially from 1 nm to 0.5 μm.

Prior to depositing the surface-textured coating medium on the polymeric support, the exposed surface may be subjected to a surface modification treatment to provide a receptive layer thereon. The treatment may be chemical or physical and, due to its ease and effectiveness, is subject to high voltage electrical stress associated with corona discharge on the exposed surface of the substrate, which is particularly suitable for treating polyolefin substrates. Conventional treatment method. Alternatively, the receptive layer can be created by pretreating the support with a solvent or a well-known medium that has a swelling action on the support polymer. Examples of such media which are particularly suitable for treating polyester supports include halogenated phenols usually dissolved in organic solvents such as p-chloro-m-cresol, 2,4.
-Dichlorophenol, 2,4,5- or 2,4
6-Trichlorophenol, or 4-chlororesorcinol in acetone or methanol solution is included. Additionally, and preferably, the treatment solution can contain a partially hydrolyzed vinyl chloride-vinyl acetate copolymer. Such copolymers conveniently contain 60 to 98% by weight of their weight of vinyl chloride units and 0.5 to 3% by weight of hydroxyl units. The molecular weight (number average) of the copolymer is conveniently in the range 10,000 to 30,000, preferably 16,500 to 25,000.

Suitable receptive layers comprise acrylic or methacrylic polymers, preferably esters of acrylic acid, especially alkyl esters (wherein the alkyl groups contain up to 10 carbon atoms, eg methyl, ethyl. , N-propyl, isopropyl, n-butyl, isobutyl, t-butyl, hexyl, 2-ethylhexyl, heptyl, and n-octyl) are coated on a polymer support with a coating formulation. Is formed by Polymers derived from alkyl acrylates (eg, ethyl acrylate and butyl acrylate) with alkyl methacrylate are preferred. A polymer comprising ethyl acrylate and methyl methacrylate is especially preferred. The acrylate monomer is preferably present in a proportion range of 30 to 65 mol%, and the methacrylate monomer is preferably present in a proportion range of 20 to 60 mol%.

Suitable for use in the preparation of acrylic or methacrylic polymers and can be used instead, but preferably copolymerized with an ester of acrylic acid and / or methacrylic acid as an optional additional monomer. The monomers and their derivatives include acrylonitrile, methacrylonitrile, halo-substituted acrylonitrile, halo-substituted methacrylonitrile, acrylamide, methacrylamide, N-methylol acrylamide, N-ethylol acrylamide, N-propanol acrylamide, N-methacrylamide. , N-ethanol methacrylamide, N-methyl acrylamide, N-
Included are t-butyl acrylamide, hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, dimethylaminoethyl methacrylate, itaconic acid, itaconic anhydride, and itaconic acid half ester.

Other optional monomers include vinyl esters (eg vinyl acetate, vinyl chloroacetate, and vinyl benzoate), vinyl pyridine, vinyl chloride, vinylidene chloride, maleic acid, maleic anhydride, styrene, and styrene derivatives ( Examples include chlorostyrene, hydroxystyrene, and alkylated styrenes (wherein the alkyl group contains 1-10 carbon atoms).

A preferred acrylic or methacrylic polymer derived from three monomers comprises 35 to 60 mol% ethyl acrylate; 30 to 55 mol% methyl methacrylate; 2 to 20 mol% methacrylamide.
And it is especially preferable that the ratio is 46/46/8 mol% respectively.

The molecular weight of suitable acrylic or methacrylic polymer components can vary over a wide range, but their weight average molecular weight is preferably between 40,000 and
300,000, more preferably 50,000-20
It is in the range of 10,000.

Another suitable receptive layer is formed by coating a polymeric support with a mixture of the acrylic or methacrylic polymers described above and a styrene / butadiene copolymer. The preferred styrene / butadiene copolymer molar ratio styrene: butadiene is about 1.4: 1.0. Preferred acrylic or methacrylic polymers for mixing with the styrene / butadiene copolymer are methylmethacrylate / ethylacrylate / methacrylamide, preferably 46/46 respectively.
/ 8 mol%. The weight ratio of styrene / butadiene copolymer to acrylic or methacrylic polymer can range over a wide range,
Preferably 1.0: 0.1-10.0, more preferably 1.0: 0.25-4.0, and especially 1.0: 1.0.
Is.

The preferred receptive layer exhibits low surface energy, which promotes shrinkage of the textured coating formulation to form a textured coating. Suitably such a receptive layer comprises any material that can be used in the low surface energy supercoats described herein. It is desirable that such a receptive layer be capable of chemically reacting with the textured coating to promote adhesion between the receptive layer and the textured coating, and, for example, when the coating is cured. It preferably comprises an acrylate double bond which reacts with an acrylate group therein.

If desired, multiple treatments can be applied to the support in succession.

Suitably, the treatment is applied at a concentration or strength which produces a receptive layer generally having a dry thickness of less than 1 μm, preferably 0.05 to 0.5 μm.

Polyester supports, such as polyethylene terephthalate films, may require one or more of the surface treatments described above in order to adequately attach the textured layer to the support.

The textured film support according to the present invention can be prepared from any synthetic film-forming polymeric material. Suitable thermoplastic materials include 1-olefins (eg, ethylene, propylene, and but-1-ene),
Included are polyamides, polycarbonates, and especially synthetic linear polyesters. The synthetic linear polyesters are one or more dicarboxylic acids or their lower alkyl (up to 6 carbon atoms) diesters such as terephthalic acid, isophthalic acid, phthalic acid, 2,5-, 2,6-, or 2,7. -Naphthalenedicarboxylic acid, succinic acid, sebacic acid, adipic acid, azelaic acid, 4,4'-diphenyldicarboxylic acid, hexahydroterephthalic acid, or 1,
2-bis-p-carboxyphenoxyethane (optionally with a monocarboxylic acid such as pivalic acid) and one or more glycols, especially aliphatic glycols such as ethylene glycol, 1,3-propanediol, 1,4-
Butanediol, neopentyl glycol, and 1,4
It can be obtained by condensation with cyclohexanedimethanol. Polyethylene naphthalate and especially polyethylene terephthalate films are preferred, with continuous stretching typically in two directions perpendicular to each other in a temperature range of 70-125 ° C., as described for example in British Patent Application No. 838708. By doing so, a film which is biaxially stretched and is preferably heat-set in a typical temperature range of 150 to 250 ° C. is preferable.

The support may also be a polyaryl ether or a thio analogue thereof, especially a polyaryl ether ketone, a polyaryl ether sulfone, a polyaryl ether ether ketone, a polyaryl ether ether sulfone, or a copolymer or thio analogue thereof. It can also comprise. Examples of these polymers are
It is disclosed in European Patent Applications Nos. 1879 and 184458 and US Patent Application No. 4008203. A particularly suitable material is STABA, a registered trademark of ICI PLC.
R is commercially available. It is also possible to use blends of these polymers.

Suitable thermosetting resin support materials include addition polymerized resins (eg acrylic resins, vinyl resins, bismaleimide resins and unsaturated polyester resins), formaldehyde condensation resins (eg urea resins, melamine resins, And phenolic resins), cyanate resins, isocyanate resins, epoxy resins, functionalized polyester resins, polyamide resins, or polyimide resins.

The polymer film support for producing a surface textured film according to the present invention may be unstretched or uniaxially stretched, but is preferably biaxially stretched. Thermoplastic polymer supports are conventionally biaxially stretched by drawing in two mutually perpendicular directions in the plane of the film to achieve a satisfactory combination of mechanical and physical properties. Achieving simultaneous biaxial stretching by extruding a thermoplastic polymer tube, followed by quenching, reheating and then expanding by internal gas pressure to induce transverse stretching and pulling at a rate that induces longitudinal stretching. You can Continuous stretching can be accomplished in a tenter process by extruding a thermoplastic support material as a flat extrudate, followed by first stretching it in one direction and then in another direction orthogonal to each other. it can. In general, it is preferred to first stretch in the machine direction, i.e. in the forward direction of the film stretcher, and then in its transverse direction. The stretched support can be, and preferably is, dimensionally stabilized by heat setting under dimensional restraint at a temperature above its glass transition temperature.

The surface-textured coating medium is suitably applied to the receptive side of a pre-stretched and preferably heat-set film support.

The thickness of the support of the surface-textured film according to the invention can vary over a wide range, but is generally less than 300 μm, preferably 2-250 μm, and especially for optical data storage applications 2-75 μm, and In particular for membrane contact switches applications it is 125-250 μm. The thickness of each layer deposited on the support is smaller than that of the support. Therefore, the film according to the invention can be expected to exhibit a total thickness of about 5-310 μm, in particular 10-260 μm.

The textured layer can be applied to one or each side of the polymeric support. Alternatively, one side of the support may be uncoated or it may be coated with a single layer or multiple layers other than the textured layers specified herein. In a preferred embodiment of the present invention, the surface textured film has a four-layer structure, that is, a support layer (eg, linear polyester) of a film-forming resin having a receptive layer on each side, and one remote layer of the receptive layer. Surface (rem
surface surface).

One or more of the polymer layers of the film according to the invention can contain any of the additives conventionally used in the production of thermoplastic polymer films. In this way, antistatic agents, dyes, pigments, void agents (v
agents, lubricants, antioxidants, anti-tacking agents, surfactants, slip aids, gloss improvers, prodegradants, ultraviolet light stabilizers, viscosity modifiers, and dispersion stabilizers. It may be incorporated into a support and / or a receptive layer and / or a surface-textured layer as appropriate.

The films according to the present invention are useful in a wide range of applications including membrane contact switch (MTS) assemblies, data storage media, drafting media, and thermal transfer printing dye sheets. The films of the present invention can exhibit improved friction properties at the elevated temperatures found in thermal transfer printing applications.

[0083]

The present invention will be further described with reference to the following examples.

In evaluating the products of the examples, the following test procedure was adopted.

Procedure 1 Adhesion to support Adhesion is defined by the steps of I) cutting into the coating with the edge of a dissecting knife to form a grid of 9 squares in a 2 x 2 cm area, II) a step of strongly crimping Tesa tape 4104 to the test area, III) a step of quickly peeling the tape, IV) a step of evaluating the amount of coating removed by the number of damaged squares, and V) a step II).
~ IV) is repeated 7 more times.
Adhesion was expressed as the number of squares peeled off relative to the number of times the tape was peeled off.

Procedure 2 Surface Roughness Surface roughness is Pert with "free tracing system" and data pickup No FTK 3-50.
The average roughness (Ra) and average groove distance (Rsm) on the film under test was measured using a homer S6P surface measurement and recording device.

Procedure 3 Haze and total light transmission (TLT) of the film during the optical property test.
Is a Gardner / Neotec device model XL21
Haze and TLT values were read as direct readings from 5x5 cm film samples using a 1 Hazegard system. Each film was run in triplicate and the average of the results for each film was recorded.

The gloss measurement value is AST for specular gloss.
Highspec Glosshead Model 10 and Model DS29 Universal Digital supplied by Diffusion System by a method based on the MD-523-67 standard test method.
Obtained using Readout. 11 for this test
A 6 cm film sample was used.

Procedure 4 Pencil Hardness Pencil hardness is ASTM for film hardness according to the pencil test.
Determined according to the D3363-74 standard test method.

Step 5 Surface Friction Surface friction is measured by Lloyd JJ commercially available from Instron.
Determined using T5K "Tensile Tester". The film sample prepared in Example 11C is overlaid on the base plate of the apparatus with the textured coated side facing down, and the film sample to be tested is placed on the underside of the block weighing 5.88N. Fixed with the face down. The block was placed on a film sample on a base plate. The block was fitted with wire and the tensile tester was run at a crosshead speed of 50 mm / min. The force on the wire required to move the block was measured with a load cell to obtain static and dynamic friction readings. The film sample to be tested was allowed to equilibrate for 1 hour at a temperature of 20 ° C. and 60% relative humidity.

Example 1 A polyethylene terephthalate film was melt extruded, cast on a chilled rotating drum and stretched in the direction of extrusion to about 3 times its original size. Both sides of the cooled stretched film were then coated with an aqueous receptive layer formulation containing the following ingredients: acrylic resin (methyl methacrylate / ethyl acrylate / methacrylamide containing 25% by weight of methoxylated melamine formaldehyde; 46 / 46/8 mol% of 1
6 wt% aqueous latex) ... 18.75 liters Ludox ™ (50 wt% aqueous silica slurry with average particle size of about 20 nm supplied from Du Pont) 0.4
3 liters ammonium nitrate (10% by weight aqueous solution) ... 0.20 liters Synperonic N (27% by weight nonylphenol ethoxylate aqueous solution supplied by ICI) ...
50 liters deionized water ... to a total of 100 liters (pH of the formulation was adjusted to 9.0 with dimethylaminoethanol before addition of Ludox ™).

The receptive layer coated film was passed through a tenter oven where it was dried and stretched in the cross direction to approximately three times its original size. The biaxially stretched coated film was heat set at a temperature of about 200 ° C. by conventional means. The final film thickness was 125 μm and the dry coating weight was about 0.3 mgdm ⁻² .

One of the receptive layers was then hand coated with a Meier bar using the following coating formulation: Zinc diacrylate (supplied by Rohm Gmbh) ... 21.0
Wt% Gafgard 233 (about 80 wt% pentaerythritol pentaacrylate and N-vinylpyrrolidone supplied by GAF) ... 57.0 wt% Irgacure 651 (2,2-dimethoxy-2-phenyl supplied by Ciba Geigy Acetophenone) 1.0% by weight Methanol 21.0% by weight

The wet coating applied had a thickness of about 12
μm and dried in an oven at 100 ° C. for 1 minute. The dry coating is a 80 W / cm medium pressure mercury arc lamp concentrated in air (Primarc "mini-cure" equipment).
The film was cured by passing the film once under 2 meters per minute (mpm).

The cured film exhibits a surface texture and is suitable for use as a light-shielding coated film for membrane contact switch applications. The exposed receptive coating layer promotes adhesion to the graphic ink that is visible through the support and the textured coating layer. The coating properties of the cured film were evaluated and the results are listed in Table 1.

Example 2 The procedure of Example 1 was repeated using the same support and receptive layer, except that the textured surface layer was derived from a coating formulation comprising the following ingredients: Zinc Diacrylate ... 11.6 wt% Sartomer 399 (supplied by Sartomer,
Dipentaerythritol monohydroxypentaacrylate) ... 34.7% by weight Irgacure 651 ... 1.5% by weight Methanol ... 52.2% by weight

The thickness of the wet coating applied is about 6μ
m and dried it in an oven at 100 ° C. for 1 minute. The dry coating was cured with a single pass of the film at 3 mpm under an 80 W / cm concentrated medium pressure mercury arc lamp (Primarc "mini-cure" device) concentrated in air.

The cured film exhibits a surface texture and is suitable for use as a protective coating exhibiting low haze. Evaluate the coating properties of the cured film,
The results are shown in Table 1.

Example 3 The procedure of Example 1 was repeated, except that the thickness of the support was 7
5 μm and the receptive layer was derived from a formulation comprising the following ingredients: acrylic resin (methyl methacrylate / ethyl acrylate / methacrylamide containing 25% by weight of methoxylated melamine formaldehyde; 46/46/8 mol% Of 1
6 wt% aqueous latex) ... 3.125 liters Ludox ™ (50 wt% aqueous silica slurry with an average particle size of about 20 nm supplied from Du Pont) 0.4
3 liters ammonium nitrate (10% by weight aqueous solution) ... 0.20 liters Synperonic N (27% by weight nonylphenol ethoxylate aqueous solution supplied by ICI) ...
50 liters deionized water ... to a total of 100 liters (pH of the formulation was adjusted to 9.0 with dimethylaminoethanol before addition of Ludox ™).

The textured surface layer was derived from a coating formulation comprising the following components: Zinc diacrylate ... 2.1 wt% Sartomer 399 ... 4.9 wt% Irgacure 907 (supplied by Ciba Geigy, 2-methyl-1-[(4-methylthio) phenyl]
-2-morpholino-propane-1) ... 0.48% by weight Methanol ... 92.52% by weight

The wet coating applied had a thickness of about 12
μm and dried in an oven at 80 ° C. for 30 seconds. The dry coating is an 80 W / cm medium pressure mercury arc lamp concentrated in air (Primarc (mini-cure) equipment).
The film was cured by passing the film once under 5 mpm.

The cured film exhibits a surface texture and is suitable for use as a durable low friction backcoat for flexible data storage media. The coating properties of the cured film were evaluated and the results are listed in Table 1.

Example 4 The procedure of Example 3 was repeated using the same support and receptive layer, except that the textured surface layer was derived from a coating formulation comprising the following ingredients: Sartomer SR368 (Cray Valley Products
Supplied by Tris (2-hydroxyethyl) isocyanurate triacrylate) ... 1.0 wt% Irgacure 907 ... 0.7 wt% Methanol ... 98.9 wt%

The applied wet coating was dried in a 125 ° C. oven for 10 seconds to provide a dry coating weight of about 110 mg / m ² . The dry coating was placed under two concentrated 300 W / inch (118 W / cm) medium pressure mercury arc lamps (Fusion systems H type) in nitrogen for 30 minutes.
The film was cured in one pass at mpm. The thickness of the cured film was about 0.7 μm.

The uncoated side of the film was treated to provide an underlayer for optically smoothing the support and then sputter coated with an aluminum alloy to form a reflective surface. This side was then coated with a dye / binder sensitive layer followed by a submicron clear protective overcoat layer.

The protective overcoat layer (thickness 30 nm) is
Derived from a formulation comprising a 0.4 wt% solvent based solution of a reactive component consisting of: Reactive component Ebecryl 220 (a hexafunctional aromatic urethane acrylate obtained from UCB) ... 64.5 wt. % Ebecryl 210 (difunctional aromatic urethane acrylate obtained from UCB) 21.5 wt% Ebecryl 1360 (silicone acrylate obtained from UCB) 3.8 wt% Uvecryl P115 (amino acrylate obtained from UCB) 3 .4 wt% Irgacure 907 (2-methyl-1-[(4-methylthio) phenyl], supplied by Ciba Geigy
-2-Morpholino-propanone-1) ... 6.8 wt% Solvent-based industrial methylated spirit ... 75 vol% Acetone ... 25 vol% Diacetone ... 5 vol%

The cured film exhibits a surface texture and is suitable for use as a durable low friction backcoat for flexible data storage media. The coating properties of the cured film were evaluated and the results are listed in Table 1.

Example 5 The procedure of Example 1 was repeated using the same support and receptive layer, except that the textured surface layer was derived from a coating formulation comprising the following ingredients: Zinc Diacrylate ... 34.9% by weight Gargard 233 ... 18.4% by weight Irgacure 651 ... 1.9% by weight Methanol ... 44.8% by weight

The wet coating applied had a thickness of about 12
μm. The coating described in Example 1,
Drying and curing conditions were adopted.

The cured film exhibits a surface texture and is suitable for use as a durable ink / pencil receptive coating for drafting film applications. The coating properties of the cured film were evaluated and the results are listed in Table 1.

Example 6 The procedure of Example 1 was repeated, except that the textured surface layer was derived from a formulation comprising the following raw material components: Zinc diacrylate ... 42.3 wt% Irgacure 651 ... 5 0.3% by weight Methanol ... 52.4% by weight

The wet coating applied had a thickness of about 12
μm. The coating described in Example 1,
Drying and curing conditions were adopted.

Example 7 The procedure of Example 1 was repeated using the same support and receptive layer, except that the textured surface layer consisted of the following two coating formulations: first a 5% coating. From the solution (formulation 7A) and secondly the 10% coating solution (formulation 7B). The coating solution is Mei
It was applied to the receptive layer by hand using an er rod. Formulation 7A Zinc diacrylate ... 1.0 wt% Plex 6696-0 (oligomer acrylate thioether supplied by Rohm) ... 4.0 wt% Irgacure 907 ... 0.35 wt% Methanol ... 94.65 wt% Formulation 7B Zinc diacrylate ... 2.0 wt% Plex 6696-0 (oligomer acrylate thioether supplied by Rohm) ... 8.0 wt% Irgacure 907 ... 0.7 wt% Methanol ... 89.3 wt%

The wet coating applied had a thickness of about 12
μm and dried in an oven at 100 ° C. for 1 minute. The dry coating is a 80 W / cm medium pressure mercury arc lamp concentrated in air (Primarc "mini-cure" equipment).
The film was cured by passing the film once under 2 mpm. The coating properties of the cured film were evaluated and the results are listed in Table 2.

Example 8 The procedure of Example 7 was repeated using the same support and textured surface layer to make two films (5% and 10% coating solutions, formulations 8A and 8 respectively).
B), except that the support was not coated with the receptive layer before coating the surface layer with the texture. The coating properties of the cured film were evaluated and the results are listed in Table 2.

Example 9 A polyethylene terephthalate film was melt extruded, cast on a chilled rotating drum and stretched in the direction of extrusion to about 3 times its original size. The uniaxially stretched film was passed through a tenter oven where it was dried and stretched in the transverse direction to about 3 times its original size. The biaxially stretched film was heat set by conventional means at a temperature of about 200 ° C. The final film thickness was 100 μm.

Both sides of the biaxially oriented polyethylene terephthalate film were coated with a basecoat formulation containing the following raw material components: p-chloro-m-cresol ... 2.5 g VAGH (supplied by Union Carbide, hydroxyl content. 2.3 wt% and weight average molecular weight 23,000
Showing vinyl chloride / vinyl acetate (ratio 90: 4% by weight)
Copolymer) ... 0.5 g Acetone ... Amount to make final volume 100 ml

After coating, it was dried in a hot air oven maintained at 100 ° C. to give a film in which each receptive layer had a dry coating thickness of about 0.2 μm.

One side of the pretreated polyethylene terephthalate film was then hand coated with the Meier bar with the coating formulation used in Example 7. The coating, drying, and curing conditions were the same as in Example 1. The coating properties of the cured film were evaluated and the results are listed in Table 2.

Example 10 The procedure of Example 1 was repeated using the same support and receptive layer, except that the surface layer with surface texture contained the amorphous silica nucleating agent introduced by rapid dispersion for 15 minutes. From the coating formulation. The coating formulation comprised the following components: Aerosil TT600 (supplied by Degussa, average primary particle size 22 nm and specific surface area 200 m ² /
1.5% by weight Zinc diacrylate ... 8.0% by weight Plex 6696-0 ... 35.0% by weight Irgacure 651 ... 2.6% by weight Methanol ... 52.9% by weight

The wet coating applied had a thickness of about 12
μm. The coating, drying, and curing conditions were the same as in Example 1.

The cured film exhibits a surface texture and is suitable for use as a light-shielding coated film for membrane contact switch applications. The exposed receptive coating layer promotes adherence to the graphic ink visible through the support and the textured coating layer. The coating properties of the cured film were evaluated and the results are listed in Table 3.

Example 11 The procedure of Example 3 was repeated, except that the surface layer with surface texture was treated with a nucleating agent (Pr) introduced by high speed dispersion for 60 minutes.
Derived from a coating formulation containing index XE2). The coating formulation comprised the following components: Printex XE2 (carbon black supplied by Degussa and having a specific surface area of 1000 m ² / g and a pH of 8) ... 2.0% by weight zinc diacrylate ... 3.0 Weight% Plex 6696-0 ... 8.5 weight% Sartomer 399 ... 8.5 weight% Irgacure 907 ... 1.4 weight% Methanol ... 76.6 weight%

The wet coating applied had a thickness of about 12
μm and dried in an oven at 100 ° C. for 1 minute. The dry coating is a 80 W / cm medium pressure mercury arc lamp concentrated in air (Primarc "mini-cure" equipment).
The film was cured by passing the film once under 2 mpm. The coating properties of the cured film were evaluated and the results are listed in Table 3.

Example 12 The procedure of Example 3 was repeated with the receptive layer and support providing a dry coating weight of about 0.3 mgdm ^-2 and a film thickness of 75 μm, but the textured surface layer was Derived from the coating formulations 12A-12G shown and applied to the receptive layer by "bead (meniscus) coating": Composition (wt%) 12A 12B 12C 12D 12E 12F 12G 12H 12J Plex 6696-0 --- --- 4.25 8.5 3.8 3.8 Sartomer 399 1.3 3.26 5.21 7.16 9.12 4.25 8.5 3.8 3.8 Zinc Diacry 0.56 1.4 2.23 3.07 3.90 1.50 3.0 1.35 1.35 Rate Irgacure 907 0.14 0.35 0.56 0.77 0.98 0.70 1.4 0.65 0.65 Methanol 98.0 95.0 92.0 89.0 86.0 89.3 78.6 45.2 18.1 Tetrahydro − − − − − − − − 45.2 − Furan Acetone − − − − − − − − 72.3 Total solids 2.0 5.0 8.0 11.0 14.0 10.7 21.4 9.6 9.6 (% by weight)

The wet coating applied had a thickness of about 12
.mu.m and dried in an oven at 100.degree. C. for less than 20 seconds for 12A to 12G, and for 10 seconds and 20 seconds in an oven at 125.degree. The dry coating is a pair of concentrated 300 W / inch (118 W / cm) UV lamps (microwave generation H-type bulb Fusion system) in a nitrogen purge atmosphere.
ms), 24 meters per minute (mpm) for Examples 12A-12E, 30 mpm for Examples 12F and 12H, 20 mpm for Example 12G, and 15 mpm for Example 12J. 1
Passed and cured.

The uncoated side of Films 12C, 12F, and 12G was treated with the same overcoat coating formulation as in Example 4, except that the formulation contained 3.75 w / v% solvent based solution of the reactive components. To provide a coating having a thickness of 220 nm.

A second sample of film 12F was prepared and labeled 12F (thin). Film 12F (th
in) was prepared by the same procedure as 12C, 12F, and 12G, except that the submicron transparent protective overcoat layer had a thickness of 30 nm. The coating properties of the cured film were evaluated and the results are listed in Table 4.

Example 13 Dry coating weight approximately 1200 mgdm ^-2 and film thickness 75 μm
The procedure of Example 3 was repeated using a receptive layer and a support that provided the following, except that the textured surface layer was derived from Coating Formulations 13A-13C shown below, and a "beads (meniscus) coating". Applied to the receptive layer by: Composition (wt%) 13A 13B 13C Chromium triacrylate 0.30 --Zirconium tetraacrylate --0.45 Lead (II) diacrylate --0.75 Sartomer 399 3.8 3.8 3.8 Plex 6696-0 3.8 3.8 3.8 Irgacure 907 0.63 0.63 0.63 Methanol 91.47 91.32 91.02 Total solids (% by weight) 8.53 8.68 8.98

Two films for each of 13A, 13B, and 13C were coated with a coating drying time (air impingement) and a UV cure line speed (paired in a nitrogen purge atmosphere) as shown below. 300
Only with W / inch (118W / cm) UV lamp (using microwave generating H type bulb Fusion systems): 13A 13A '13B 13B' 13C 13C 'Drying time (sec) 30 20 60 30 60 10 UV curing (line speed) 10 15 5 10 5 30

The uncoated side of all the films of this example was treated to give the same coating as described in Example 4. The coating properties of the cured film were evaluated and the results are shown in Table 4.

Example 14 A 6 μm thick biaxially oriented polyester terephthalate support film (obtained from Toray) was coated with the following formulation to provide a 13 μm thick wet coating: Zinc diacrylate ... 2.23 wt. % Sartomer 399 ... 5.21% by weight Irgacure 907 ... 0.56% by weight Methanol ... 92.0% by weight

The coating was coated directly onto the support by "bead" (meniscus) coating and dried at 100 ° C for 12 seconds. The coating was then cured by passing the film once at 24 mpm under a 120 W / cm medium pressure mercury arc lamp in a nitrogen purge atmosphere.

Onto the first coating, a 12 μm wet second coating from the following formulation was applied by means of a Meier bar: Zinc diacrylate ... 1.00% by weight Irgacure 907 ... 0.07% by weight Methanol ... 98 .93% by weight

The second coating was dried in a 90 ° C. oven for 30 seconds and applied to a 80 W / cm medium pressure mercury arc single lamp.
Cured by exposure at mpm.

The film was suitable for use as a backing bearing support for thermal transfer printing dye sheets. The surface roughness of the produced film with surface texture was measured and described below. The handleability of the film was evaluated by working the film with a thermal transfer printer (Hitachi VY200) and recording the fusing or creases of the film with a thermal print head.

Results The films made in this example exhibited the following surface characteristics: Ra; 1.2 μm Rsm; 200 μm The film showed no visible fusion or creases when passed through a printer. .. According to this evaluation, the back coating of the film has good thermal stability (no fusion) and friction properties (no creases) and is therefore suitable for use as a back coating for thermal transfer dye sheets. Was clearly illustrated.

Example 15 The procedure of Example 12 was repeated to make the same film as Example 12F, except that the surface textured coating solution contained 9.6 wt% total solids (each of the coating solutions). The components were present in the same relative proportions as in Example 12F), but the coating was dried in two stages: the first stage at 125 ° C for 6 seconds and the second stage at 85 ° C for 5 seconds. The coating was cured as in Example 12F.

The cured coating was then coated with 0.0 of carnauba wax (available from Hopkin and Williams).
"Beads" (meniscus) with a low surface energy supercoat consisting of a 5 w / v% "Genklene" (1,1,1-trichloroethane available from ICI) blend.
It was applied by the technique to give a wet coating weight of 13 gm ^-2 .
The supercoat was then dried at 80 ° C for 18 seconds.

The produced film had a surface roughness (Ra0.
66 μm and Rsm 180 μm) and static friction coefficient 0.3
1 was shown. The surface energy of the film is ASTM
It was determined to be less than 36 dyne / cm by D2578-67.

Example 16 This example is a comparative example not according to the invention.
The surface texture of the film produced in this example was provided by a conventional inorganic filler (alumina hydrate) and not by the acrylate monomer. The avoidance of surface-forming monomers was by introducing a relatively high boiling solvent (diacetone alcohol) into the coating formulation.

The procedure of Example 12 was repeated using the same support and receptive layer, and the coating formulation comprised the following components: Ebecryl 600 (a bifunctional epoxy supplied by UCB. Acrylate oligomer) ... 7.06 wt% Hydrated alumina ... 0.05 wt% Irgacure 907 ... 0.28 wt% Quantacure ITX (International Bio Sy
nthetics (IBS) supplied mixture of 2-isopropylthioxanthone and 4-isopropylthioxanthone) 0.14 wt% Quantacure EPD (ethyl 4- (dimethylamino) benzoate supplied by IBS) 0.14
% By weight Uvecryl P115 (amino acrylate supplied by UCB) 0.28% by weight cellulose acetate ... 0.024% by weight diethyl orthophthalate ... 0.024% by weight acetone ... 69.0% by weight methanol ... 18.4% by weight Diacetone alcohol ... 4.6% by weight

The coating, drying and curing conditions were the same as in Example 12. The uncoated side of the film was treated using the same procedure as when treating the uncoated side of the film made in Example 4. The coating properties of the film were evaluated and the results are shown in Table 4.

Example 17 This is a comparative example not according to the present invention. The procedure of Example 12 was repeated using the same support and receptive layer, except that the textured surface layer was derived from the coating of the following formulation and contained conventional inorganic filler (silica). I decided to do it. The coating formulation is Aerosi
1 R972 was prepared by dispersing by bead kneading in a millbase formulation for 40 minutes to provide a millbase formulation comprising the following components: Ebecryl 5129 ... 29.93 wt% Isopropyl alcohol ... 29. 93% by weight Methanol ... 29.93% by weight Aerosil R972 ... 9.99% by weight Isocetyl stearate ... 0.23% by weight

The millbase was then gradually diluted with the other ingredients to provide a coating formulation comprising the following ingredients: Ebecryl 5129 (a hexafunctional aliphatic urethane acrylate supplied by UCB) ... 10 0.0 wt% Aerosil R972 (supplied by Degussa,
Average primary particle size 16 nm and BET surface area 110 ± 20
Hydrophobic surface-treated silica exhibiting m ² /g)...1.0 wt% isocetyl stearate ... 0.02 wt% Irgacure 907 ... 0.4 wt% Uvecryl P115 (aminoacrylate coinitiator supplied by UCB) ... 0.4% by weight Isopropyl alcohol ... 3.0% by weight Acetone ... 61.83% by weight Methanol ... 19.25% by weight Diacetone alcohol ... 4.1% by weight

The wet coating applied had a thickness of about 12
μm and dried in an oven at 80 ° C. for 40 seconds. The dry coating was a pair of concentrated 3 in a nitrogen purge atmosphere.
Under the 00W / inch (118W / cm) UV lamp (microwave generation H type bulb Fusionsystems),
The film was cured in one pass at 10 meters / minute (mpm).

The film 12F (t produced in Example 12)
The uncoated side of the film was treated using the same procedure as when treating the uncoated side of hin).
The coating properties of the cured film were evaluated and the results are shown in Table 4.

Example 18 The film 12C produced in Example 12 and Example 16
The film prepared in (Comparative Example) was evaluated as an optical data storage tape medium.

Two film samples were slit to 35 mm
Taped and treated films 12C and 16
(Comparative Example) was spliced together to produce a composite tape.

The composite tape was wound 10,000 times at 500 m / min at a tension of 6 Newton to inspect the aluminum alloy-dye / binder-overcoat surface for damage and abrasion.

Results The overcoat of the film prepared in Example 16 showed a large number of scratches and scratches. The overcoat of film 12C does not show any sign of significant wear or damage, thus providing the textured film of the present invention with respect to abrasion and damage resistance a significant improvement over prior art coated films. This is illustrated.

Example 19 The film produced in Example 4, the film 12F (thin) produced in Example 12, and Example 17 (comparative example)
The film prepared in 1. was evaluated as an optical data storage tape medium.

The film sample was slit into a 35 mm tape. The abrasion properties of the film are based on Creo Produ
The tape was evaluated by using the transporter groove of a cts1003 optical tape recorder and winding the pre-written portion of the tape back and forth between two spools at a speed of 3 m / s multiple times.

Abrasion damage was determined by measuring the bit error rate (BER) of the tape at intervals during the number of times procedure. The BER provides a measure of the ratio of the number of damaged data bits to the number of data bits originally recorded.

The results of these tests are shown in Table 5 and graphed in FIG. The film of Example 17 was not tested after 10,000 runs because the error rate was unacceptably high. On the other hand, films 4 and 12F are each 500
It gave low error rates even after 00 and 60,000 times.

The initial BER value of the film of Example 4 is significantly lower than that of Examples 12F and 17 because the aluminum is a subbing layer which provides a sputtered optically smooth surface.

[0157]

[Table 1]

Examples 1-6 illustrate that the films of the present invention can have a wide range of combinations of surface roughness and optical properties.

[0159]

[Table 2]

Examples 7-9 show that the textured coatings disclosed herein can be applied to various receptive layers or directly onto an untreated support, and the surface Without any drawbacks due to lack of adhesion between the tissue coating and the support or receptive layer,
7 illustrates providing desirable surface roughness properties.

[0161]

[Table 3]

Examples 10 and 11 illustrate that when a nucleating agent is included in the coating formulation, a wide range of optical properties are obtained, along with desirable surface roughness properties.

[0163]

[Table 4]

Examples 12A, 12B, 12C, 12D,
12E, 12F, and 12G illustrate that films having a wide range of solids content can be used to obtain substantially equivalent kinetic friction properties. Examples 12H and 12J illustrate that comparable surface roughness properties are obtained when applying a particular coating from various solvent systems. Examples 13A-13C 'illustrate that various metal acrylates provide the desired combination of surface roughness (Ra) and stiction.

[0165]

[Table 5]

Preferred Features It is preferred that the textured film according to the present invention exhibits one or more of the following features: The polymer or polymer component of the textured coating comprises a polyfunctional (meth) acrylate ester polymer. 2. The polyfunctional (meth) acrylate ester polymer is present in an amount of at least 1% by weight, based on the curing component in the coating. 3. At least 10% of the available (meth) acrylate double bonds present in the uncured coating are converted to single bonds by curing the coating. 4. The polymer or polymer component of the textured coating comprises a metal (meth) acrylate. 5. The film further comprises a supercoat having a low surface energy on the textured coating.

[Brief description of drawings]

FIG. 1 is a schematic front view (ratio is indeterminate) of a portion of a textured film comprising a stretched polymer support (1) and a textured layer (3) on a first surface (2) thereof. ..

FIG. 2 is a fragmentary schematic front view of a similar film including another receptive layer (4) between the support (1) and the surface textured layer (3).

FIG. 3 is a fragmentary schematic front view of a film similar to FIG. 2 including another second receptive layer (6) on the isolation surface (5) of the support (1).

FIG. 4 is a graph showing the influence of the number of tape windings on the bit error rate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... 1st surface 3 ... Surface-texturing layer 4, 6 ... Receptive layer 5 ... Isolation surface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B44C 1/17 L 9134-3K

Claims (6)

[Claims] 1. A textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one polymer, said surface texture being a polymer or a plurality of polymers. The textured film which has been provided primarily by the polymer itself and in which the support has not been stretched after coating formation. 2. A textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one polymer, said surface texture comprising a polymer or a plurality of polymers. The textured film which is provided primarily by the polymer itself and which exhibits an average surface roughness (Ra) of at least 0.05 μm. 3. A textured film comprising a polymeric support having on at least one surface thereof a textured coating comprising a curable material comprising at least one polymeric component, wherein the surface texture of said coating is: The textured film resulting at least in part as a result of evaporation of the volatile vehicle from a coating formulation comprising a volatile vehicle and an unpolymerized component. 4. A textured film comprising a polymeric support having at least one surface a textured coating comprising a curable material comprising at least one multifunctional (meth) acrylate ester polymer. The film with surface texture, wherein the surface texture is mainly imparted by a polymer or a plurality of polymers themselves. 5. The surface-textured film according to claim 1, which has a surface-textured coating on one surface of the support and a dye layer on the other surface of the support. A thermal transfer printing dye sheet comprising. 6. Coating a polymeric support with a volatile vehicle solution or dispersion of a material, drying the coating to remove at least a portion of the volatile vehicle, wherein the material is a coating of the material. A surface-improved film comprising at least one polymerizable component such that the drying step is effective for imparting a surface texture to the dry layer formed by the method), and a step of curing the dry layer. Manufacturing method.