WO1994003836A1 - Masking film - Google Patents

Masking film Download PDF

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Publication number
WO1994003836A1
WO1994003836A1 PCT/EP1993/002088 EP9302088W WO9403836A1 WO 1994003836 A1 WO1994003836 A1 WO 1994003836A1 EP 9302088 W EP9302088 W EP 9302088W WO 9403836 A1 WO9403836 A1 WO 9403836A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
cut
masking
masking film
light
Prior art date
Application number
PCT/EP1993/002088
Other languages
English (en)
French (fr)
Inventor
Axel NIEMÖLLER
Original Assignee
Renker Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renker Gmbh & Co. Kg filed Critical Renker Gmbh & Co. Kg
Publication of WO1994003836A1 publication Critical patent/WO1994003836A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
    • G03F1/68—Preparation processes not covered by groups G03F1/20 - G03F1/50

Definitions

  • the invention relates to masking films for use in photomechanical reproduction processes.
  • Masking films of this type comprise a transparent base film which is provided with a peelable light- absorbing layer.
  • a thin adhesive layer is present between the base film and the light-absorbing layer.
  • DE-B 2354874 describes a masking film compris ⁇ ing a transparent base film which is roughened or oxi- dized on one side, and a coloured, light-absorbing resin layer which is applied to one side of the base film by means of an adhesive layer and is bonded by means of a pressure-sensitive adhesive layer to an additional peelable film.
  • US-A-2,576,491 discloses a masking film compris ⁇ ing a dimensionally stable film of polyvinyl chloride/polyvinyl acetate and an adhesive layer and a nitrocellulose light-absorbing layer applied thereto.
  • EP-A-168924 relates to a masking film having a base film of polyester or polycarbonate to which the coloured masking layer made from a vinyl chloride-vinyl acetate copolymer and an aromatic polyesterurethane is applied directly, without adhesive.
  • EP-A-188292 discloses a masking film comprising a base film, a pressure-sensitive adhesive layer and a nitrile rubber and/or nitrocellulose light-opaque layer which can be peeled off and contains an epoxidized fatty acid ester as adhesion promoter.
  • EP-A-323880 describes a masking film whose coloured and pigmented masking layer contains a cellulose ester in combination with an aliphatic polyester urethane.
  • a synthetic adhesive resin or a natural rubber latex is present.
  • EP-A-329437 relates to a masking film containing a peelable layer of a vinyl chloride copolymer mixed with two nitrile rubbers containing different amounts of acrylonitrile.
  • the masking layer can contain organic and inorganic fillers and dyes.
  • the peelable layer may also be used to improve the adhesion to the base film.
  • SUBSTITUTE SHEET contain an organopolysiloxane.
  • EP-A-344883 discloses a masking film whose peelable masking layer contains finely divided inorganic metal compounds for blocking UV rays.
  • binders in the masking layer numerous polymers are mentioned, for example one or more of polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinylformal, polyvinylacetal, acrylic resins, polyamido resins, polyacetal resins, polyester resins, phenolic resins, urea resins, melamin resins, alkyd resins, polyurethane resins, cellulose acetate resins, polyvinyl alcohol, copolymers of vinyl chloride and vinyl acetate or vinylidene chloride or acrylates or vinyl acetate and maleic acid, copolymers of vinyl acetate and ethylene, cellulose derivatives, such as nitrocellulose and cellulose esters, cellulose ethers and diene rubbers, olefin rubbers and urethane rubbers.
  • the peelable light-opaque masking layer disclosed in EP-A-352079 contains a dialkyl phthalate, nitrocellulose and a light-resistant dye.
  • the layer contains a filler having a particle size of 0.1-15 ⁇ m in order to give the layer a roughness of 0.05-1.5 ⁇ m .
  • the light-absorbing properties of the peelable layer are generally adjusted by introducing soluble dyes, but it is also possible to use finely divided inorganic fillers and pigments to adjust the light transparency. Since the masking films must have very good dimensional stability and accurate fit, the properties of the peel ⁇ able masking layer are adjusted through the choice of polymers and added auxiliaries in such a way that the cut edges close again virtually completely after cutting with a knife, .so that no exposure of the printing plate takes place beside the keen cut lines in the non-peeled image areas of the masking film. The closing of the separation or cut line leaves no visible edge or mark which enables recognition of the cut pattern. This makes manual peeling off of the cut-off material more difficult and can easily result in errors which make the mask unusable. This is a particular problem in the cutting of colour separations. in which, for example, 4 identical cut patterns must be produced in various separations.
  • EP-A-372129 discloses a masking film in which the recognition of cut lines is simplified by the introduc- tion of a fluorescent substance into the layer to be peeled off, or a further layer containing a fluorescent compound is formed on the masking layer or between the base film and the masking layer.
  • This solution for simplifying recognition of the cut lines has the disadvantage that fluorescent dyes have relatively poor light fastness, and additional dyes must be incorporated into the layer in order to achieve the desired light absorption. This results in reduced or extinguished fluorescence. The desired side edge fluorescence disap- pears as soon as the cut lines have closed again after cutting due to the recovery forces in the peelable layer.
  • the object of the invention is to provide a masking film which avoids the disadvantages of known masking films and in which the cut lines are easy to detect and remain detectable.
  • a masking film having a transparent base film and a peelable, light-absorbing coating applied thereto and a layer applied thereto for marking cut lines, characterized in that the additional layer has a thickness of from 0.5 to 20 ⁇ m and comprises a hard, brittle material, so that on cutting by means of a knife, material fracture takes place at the cut edges and a fine pulverulent dust is formed.
  • the cutting causes material losses of
  • the masking film according to the invention has a multilayer structure.
  • a pressure-sensitive adhesive layer having a thickness of 0.1-2.0 ⁇ m is applied to the plastic base film in order to ensure that the masking layer can be removed.
  • This is followed by the formation of the peelable, light-absorbing layer with a thickness of 20-50 ⁇ m, which can be removed on use together with the adhesive. If the peelable masking layer has sufficiently good adhesion to the base film due to the combination of binders, the adhesive layer can also be omitted.
  • an additional layer of a hard, brittle material is applied to the peelable layer; this material causes increased light scattering at the cut edges after the cutting and marks the cut edges without them gaping apart significantly; the accurate fit of conventional materials is retained, but according to the invention the cut pattern is readily detectable as a consequence of the dust formation.
  • the base film used can be a polycarbonate film, a biaxially oriented polyethylene terephthalate film or a polypropylene film of adequate dimensional stability and transparency.
  • the base film preferably has a thick ⁇ ness of between 25 ⁇ m and 300 ⁇ m.
  • Suitable pressure-sensitive adhesives for attach ⁇ ing the peelable, light-absorbing layer are natural rubber, synthetic rubbers, polyacrylates, polyvinyl acetates, silicone polymers, polyisobutylenes and copolymers thereof.
  • an additional plasticizer or tackifier resin can be employed in the adhesive layer.
  • further conventional auxiliaries such as antioxidants, UV-absorbers, antistatics and waxes, may be present in the adhesive layer.
  • the peelable, light-absorbing layer comprises a binder system, dyes and auxiliaries.
  • the binders used can be homopolymers and copolymers, optionally in a mixture with one another and plasticizers.
  • suitable binders are cellulose derivatives, such as nitrocellulose, cellulose acetate, cellulose butyrate, cellulose propionate, vinyl acetate copolymers, poly- amides, polyesters, polyurethanes and synthetic rubbers, such as acrylonitrile-butadiene copolymers.
  • the dyes used in the peelable layer have good light fastness and achieve high UV density (> 2.6) and high optical density (> 0.6) using red and orange colours (McBeth TD 528, Wratten filter No. 106 and 18A) .
  • red and orange colours McBeth TD 528, Wratten filter No. 106 and 18A
  • green or blue dyes if desired for the intended use.
  • Dyes which can be used are listed in the C.I. (colour index) under soluble dyes, soluble metal-complex dyes being preferred.
  • the mechanical properties of the peelable layer are adjusted by a combination of binders and/or addition of plasticizers in such a way that good processing properties are ensured. In particular, a soft, flexible material which can easily be cut is desired.
  • the elonga- tion at break of such films should be in the range from 20 to 250%, and the films should have a tensile strength of greater than 4 N/mm 2 .
  • a further advantage of rela ⁇ tively soft masking layers is the plastic deformation of the cut edges after cutting, so that the opposite cut edges abut one another again after cutting, and gaps are not formed.
  • the peelable masking layer may contain conventional auxiliaries, such as matting agents, fil ⁇ lers, antistatics, lubricants, UV absorbers and antioxidants.
  • brittle layers Materials which have proven particularly suitable for the formation of the hard, brittle layers are hard resins having a relatively high softening point or those which can no longer be softened due to correspondingly dense crosslinking.
  • the thickness of the additional layer is 0.5-20 ⁇ m, preferably 1-5 ⁇ m.
  • the resins to be used according to the invention for the additional layer are neutral toward the peelable, light-absorbing layer and adhere well to this layer.
  • the resins give layers which are not scratch- or contact-sensitive.
  • Materials which have proven particularly suitable are those known as hard resins having softening points (ring-and-ball in accordance with DIN 1995) of above 80°C, preferably above 120°C. These include collophony and collophony esters, shellac, aleic resins, styrene resins, phenolic resins, polyterpene resins, coumarone resins, furan resins, polyesters and mixtures thereof.
  • reactive crosslink- able resins such as melamin-formaldehyde resins, urea- formaldehyde resins, isocyanate-crosslinkable resins or radiation-curable resins, such as multifunctional acry- lates and methacrylates, which can be crosslinked and thus cured by means of UV rays and/or by means of elec ⁇ tron beams.
  • the top layer of the hard resin can also contain antistatics, matting agents, lubricants, adhesion pro ⁇ moters and further conventional auxiliaries.
  • the invention is described in greater detail with reference to the examples below:
  • Example 1 (Comparison)
  • a biaxially stretched polyethylene terephthalate film with a thickness of 125 ⁇ m (Melinex 0 from ICI) is first coated with a pressure-sensitive adhesive layer, comprising natural rubber, tackifier resins and antioxi- dant in toluene solvent, in a dry film thickness of about 0.5 ⁇ m.
  • the light-absorbing layer is applied in a dry film thickness of 30 ⁇ m.
  • the composition of the coating is as follows:
  • the light-absorbing layer can easily be peeled off the film and has an elongation at break of 150% with a tensile strength of 18 N/mm 2 .
  • the optical density is 0.70
  • UV density is 2.70.
  • the cut lines are difficult to detect, since the cut edges closely abut again after cutting without light being able to fall through an open cut line. Cutting with a knife causes no change in the weight of the masking material.
  • the masking film from Example 1 is coated with an additional layer by means of a Meyer bar to give a dry film thickness of 3 ⁇ m and is dried in a drying cabinet.
  • the composition of the coating solution is:
  • Neopen Blue 807 2 0.1 g Silica (precipitated) Syloid 244 3) 0.9 g
  • Example 2 The process of Example 2 is carried out using the following coating solution with a dry film thickness of 5 ⁇ m on the masking film from Example 1: drying at 120°C for 1 minute.
  • the masking film from Example 1 is coated with an additional layer by using a Meyer bar to give a dry film thickness of 2 ⁇ m, and is dried in hot-air drier at 110 °C.
  • the cut lines are clearly detectable in reflected light.
  • the amount of finely divided dust formed was determined gravimetrically at 0.5 mg/m of cut line.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
PCT/EP1993/002088 1992-08-07 1993-08-05 Masking film WO1994003836A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924226156 DE4226156C1 (enrdf_load_stackoverflow) 1992-08-07 1992-08-07
DEP4226156.2 1992-08-07

Publications (1)

Publication Number Publication Date
WO1994003836A1 true WO1994003836A1 (en) 1994-02-17

Family

ID=6465068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/002088 WO1994003836A1 (en) 1992-08-07 1993-08-05 Masking film

Country Status (2)

Country Link
DE (1) DE4226156C1 (enrdf_load_stackoverflow)
WO (1) WO1994003836A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4226156C1 (enrdf_load_stackoverflow) * 1992-08-07 1993-07-22 Renker Gmbh & Co Kg, 5160 Dueren, De

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191301143A (en) * 1913-01-15 1913-07-31 Charles Henry Little Improved Manufacture of Drawing Material.
US1385567A (en) * 1919-09-22 1921-07-26 Marchisio Arthur Corqua Joseph Imitation-copper-engraving process
US2383567A (en) * 1941-05-21 1945-08-28 Republic Aviat Corp Method of making negatives for line reproduction
GB1063021A (en) * 1963-04-13 1967-03-22 Hell Rudolf Improvements relating to the production of secondary originals and colour separationnegatives
DE4226156C1 (enrdf_load_stackoverflow) * 1992-08-07 1993-07-22 Renker Gmbh & Co Kg, 5160 Dueren, De

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4923726A (en) * 1988-12-05 1990-05-08 Somar Corporation Lightsafe masking film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191301143A (en) * 1913-01-15 1913-07-31 Charles Henry Little Improved Manufacture of Drawing Material.
US1385567A (en) * 1919-09-22 1921-07-26 Marchisio Arthur Corqua Joseph Imitation-copper-engraving process
US2383567A (en) * 1941-05-21 1945-08-28 Republic Aviat Corp Method of making negatives for line reproduction
GB1063021A (en) * 1963-04-13 1967-03-22 Hell Rudolf Improvements relating to the production of secondary originals and colour separationnegatives
DE4226156C1 (enrdf_load_stackoverflow) * 1992-08-07 1993-07-22 Renker Gmbh & Co Kg, 5160 Dueren, De

Also Published As

Publication number Publication date
DE4226156C1 (enrdf_load_stackoverflow) 1993-07-22

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