CA2255072A1 - Self-adhesive film for thermal printing - Google Patents
Self-adhesive film for thermal printing Download PDFInfo
- Publication number
- CA2255072A1 CA2255072A1 CA002255072A CA2255072A CA2255072A1 CA 2255072 A1 CA2255072 A1 CA 2255072A1 CA 002255072 A CA002255072 A CA 002255072A CA 2255072 A CA2255072 A CA 2255072A CA 2255072 A1 CA2255072 A1 CA 2255072A1
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- CA
- Canada
- Prior art keywords
- film
- sensitive adhesive
- pressure sensitive
- printing
- thermal transfer
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2405/00—Adhesive articles, e.g. adhesive tapes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/42—Intermediate, backcoat, or covering layers
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
The printability, weather-resistance and curved surface stickiness of a selfadhesive film for thermal printing are improved. The self-adhesive film has a three-layer structure comprising an image receiving film (1), a self-adhesive layer (2) and a supporter (3). The image receiving film is made of polyvinyl chloride. The hardness of the image receiving film (1) is 1.4-4 kg/mm2 in terms of the 100 % modulus.
Description
CA 022~072 1998-11-10 SPECIFICATION
PRESSURE SENSITIVE ADHESIVE FILM
[Technical Field]
This invention relates to a pressure sensitive adhesive film for thermal transfer printing.
lBackground Art]
A pressure sensitive adhesive film for thermal transfer printing has a laminated structure formed of three layers of a printing film, a pressure sensitive adhesive layer and a base material. When the pressure sensitive adhesive film is put intouse,printing is madeontheprinting filmbyathermal transfer method, the base material is released from the pressure sensitive adhesive layer and the pressure sensitive adhesive layer is then pressure sensitively adhered to an adherend so as not to be removed from it. In this manner, the pressure sensitive adhesive film is used for outdoor or indoor signboards or other advertising materials, or is used as stickers, marking materials and so on.
For printing films, paper or synthetic paper have been commonly used for a long time because of their low cost and ease of use. In addition to printing films made of these materials, printing films made of polyester have been developed.
Printing films made of paper or synthetic paper are not suitable for use outdoors due to their poor strength and are CA 022~072 1998-11-10 also not suitable for application to adherends having a secondary or tertiary curved surface due to their poor flexibility. On the other hand, though printing films made ofpolyesteraresufficientlybearableto useoutdoorsbecause of their sufficient strength in contrast to the paper-made printing films, they are also unsuitable for application to adherends having a secondary or tertiary curved surface due to their poor flexibility similar to the paper-made printing films.
Meanwhile, polyvinyl chloride (PVC) film is known as general-purpose resin film. Polyvinyl chloride film not only has excellent weather resistance so as to be usable outdoors but also has excellent flexibility so as to be applicable in conformity to an adherend having a secondary or tertiary curved surface. Accordingly, polyvinyl chloride film seems to be suitable for use as a printing film of a pressure sensitive adhesive film for thermal transfer printing.
However, the surface of polyvinyl chloride film used in the pressuresensitive adhesivefilmgenerally hasunevenness having the height of several ten micrometers. Therefore, a simple use of polyvinyl chloride film as the printing film induces non-transfer of ink to concave parts of the uneven surface of the film under thermal transfer printing, though allowing transfer of inkto convex parts of the uneven surface of the film. This results in omission of print in the form of flecks on the surface of the printing film, which uglifies the printed matter. Such omission ofprint exceedingly occurs . CA 022~072 1998-11-10 as the unevenness of the printing film surface is increased and as the area of concave parts of the uneven film surface is increased. Accordingly, some countermeasure against such problem is necessary in order to use polyvinyl chloride film for the printing film of the pressure sensitive adhesive film for thermal transfer printing.
[Disclosure of Invention]
The present invention has been made in view of the foregoing problem and has its object of providing a pressure sensitive adhesive film for thermal transfer printing which is excellent in printability, weather resistance and conformability to a curved surface.
To attain the above object, the present invention is characterized by specifically designing the quality of material and the stiffness of a printing film.
More specifically, the present invention is directed to a pressure sensitive adhesive film for thermal transfer printing in which a pressure sensitive adhesive layer is provided on the back surface of a printing film whose another surface is to be printed by a thermal transfer method and a basematerial is releasably providedonthepressuresensitive adhesive layer, and employs the following solutions.
A first solution of the invention is characterized in that the printing film is made of polyvinyl chloride a surface of which has microscopic concave parts and convex parts and the stiffness of the printing film corresponds to a modulus ..CA 022~072 1998-11-10 (tensile stress) of 1.4 to 4.0 kg/mm~ with respect to a 100%
elongation of the printing film so that ink is transferred to not only the microscopic convex parts but also the microscopic concave parts on the surface of the printing film by thermal transfer printing.
A second solution of the invention is characterized in that in accordance with the first solution, the stiffness of the printing film is controlled such that a specified amount of plasticizer is added to polyvinyl chloride. The amount of addition of the plasticizer preferably corresponds to 15 to 35 parts of bis(2-ethylhexyl)phthalate per hundred parts of polyvinyl chloride.
Under each of the arrangements of the first and second solutions of the inventionl the printing film ensures a moderate flexibility so as to reliably fit on a curved surface of an adherend. Further, the surface of the printing film is not affected by the surface roughness of the base material, thereby causing no omission of print in the form of flecks.
Furthermore, the printing film is sufficiently bearable to use outdoors because of excellent weather resistance of polyvinyl chloride.
A third solution of the invention is characterized in that in accordance with the first solution, the thickness of the printing film is set at 70 to 150 ~m.
25Under the arrangement of the third solution of the invention, the surface of the printing film can be surely prevented from the influence of the surface roughness of the . CA 022~072 1998-11-10 base material without impairment of the flexibility of the printing film.
A fourth solution of the invention is characterized in that in accordance with the first solution, the base material is formed of a released paper having a basis weight of 50 g/m2 or less.
A fifth solution of the invention is characterized in that in accordance with the first solution, the base material is made of resin film whose surface in contact with the pressure sensitive adhesive layer has a surface roughness of 20 ~m or less.
Under each of the arrangements of the fourth and fifth solutions of the invention, the pressure of a print head in thermal transfer printing is transmitted uniformly to the entire surface of the printing film so that convex parts of the surface of the printing film are sufficiently pressed by the print head. This surely transfers ink to concave parts of the surface of the printing film without the occurrence of omission of print. Through the winding of the pressure sensitive adhesive film in the form of a roll in the manufacturing process, another surface of the base material not in contact with the pressure sensitive adhesive layer comes into contact with the surface of the printing film. When the surface of the base material not in contact with the pressuresensitiveadhesivelayeralso hasasurfaceroughness of 20~m or less, such small roughness has very little effect on the surface of the printing film even if the pressure CA 022~072 1998-11-10 sensitive adhesive film is stored in the form of a roll for a long time.
A sixth solution of the invention is characterized in that in accordance with the first solution, a release agent isapplied toatleastasurfaceofthebasematerial incontact with the pressure sensitive adhesive layer.
Under the arrangement of the sixth solution of the invention, when the printing film is applied to the adherend, the film can be readily released from the base material. When the release agent is applied to another surface of the base material not in contact with the pressure sensitive adhesive layer as well as the surface in contact with it, even during a long-time storage of the pressure sensitive adhesive film in the form of a roll, it can be prevented that the base material is cohered with the printing film to become hard to remove from it. Further, no delamination occurs in the printing film and the base material when the pressure sensitive adhesive film is unwound.
[Brief Description of Drawing~
Fig. l is a cross-sectional view of a pressure sensitive adhesive film for thermal transfer printing.
[Best Mode for Carrying Out the Invention]
Description is made below about an embodiment of the present invention with reference to the drawing.
Fig. l shows a pressure sensitive adhesive film for CA 022~072 1998-11-10 thermal transfer printing according to an embodiment of the present invention. In the figure, a reference numeral l denotes a printing film to be printed by a thermal transfer method. A pressure sensitive adhesive layer 2 is provided on the back surface(asurface oppositeto asurfacefor printing) of the printing film l. A base material 3 is releasably provided on the pressure sensitive adhesive layer 2.
The printing film l is made of polyvinyl chloride. The stiffness of the printing film l is controlled to correspond to a modulus of l.4 to 4.0 kg~mm' with respect to a 100%
elongation thereof in such a manner that an amount of plasticizer in the composition of the polyvinyl chloride film is set at 15 to 35 phr on the basis of bis(2-ethylhexyl)phthalate (DOP) which is one of ester phthalate plasticizers with respect to polyvinyl chloride of l00 phr.
The plasticizer applicable to the present invention is not limited to ester phthalate plasticizers. Various kinds of other plasticizers such as polyester plasticizers, ester phosphorate plasticizers and epoxy plasticizers may be applicable. In short, it is essential only that the plasticizer is added such that the stiffness of the printing film l corresponds to a modulus of l.4 to 4.0 kg/mm2 with respect to a 100% elongation thereof. In particular, when the polyester plasticizer is used for the printing film, ink transferred on the surface for printing cannot substantially be removed even through the peeling test using a cellophane tape and scratching and substantially causes no bleeding, and CA 022~072 1998-11-10 the printing film performs excellent printability, longshelf life, excellent fogging resistance and stable stiffness. An example of polyester plasticizers is W-305 produced by DaiNippon Ink And Chemicals, Inc. Here, the modulus with respect to a 100% elongation of the printing film l means a modulus when a sample piece of printing film 1 is elongated at 100%.
As mentioned above, the stiffness of the printing film 1 is set to a modulus of 1.4 to 4.0 kg/mm2 with respect to a 100% elongation thereof. The reason for this is that if the stiffness is less than 1.4 kg/mm~, the printing film 1 is too flexiblesothatthesurfacethereofis affectedby thesurface roughness of the base material 3 thereby causing omission of print and on the contrary, if the stiffness is more than 4.0 kg/mm~, the printing film l is too hard so that reliable fit thereof on the curved surface of an adherend becomes difficult.
The thickness of the printing film 1 is set at 70 to 150 ~m. The reason for this is that if the thickness is less than 70~m, the printing film 1 is too thin so that the surface roughness, i.e., unevenness, of the base material 3 emerges on the surface (surface for printing) of the printing film 1 thereby inducing omission of print and on the contrary, if thethickness ismorethan 150 ~m, theprinting film lperforms poor flexibility so that reliable fit thereof on the curved surface of an adherend becomes difficult. Since the printing film 1 is made of polyvinyl chloride excellent in weather . CA 022~072 1998-11-10 resistance, it can sufficiently be bearable to use outdoors.
For the pressure sensitive adhesive layer 2, acrylic pressure sensitive adhesives generally used for such kind of pressure sensitive adhesive films are preferable. However, the material for the pressure sensitive adhesive layer 2 is not limited to acrylic pressure sensitive adhesives.
The base material 3 is formed of a released paper typically made of woodfree paper or glassine paper or is made of resin film typified by polyester or polypropylene film.
When the base material 3 is formed of a released paper, a released paper having a basis weight of 50 g/m2 or less is used. On the other hand, when the base material 3 is made of resin film, resin film in which the surface roughness of at least the surface in contact with the pressure sensitive adhesive layer 2 is set at 20 ~m or less is used. The reason for this is that if the released paper has a basis weight over 50 g/m2 or the surface roughness of the resin film surface in contact with the pressure sensitive adhesive layer 2 is over 20 ~m, thepressure of the print head in thermal transfer printing becomes hard to transmit uniformly to the entire printing film 1 and therefore the print head cannot sufficiently press the convex parts of the surface of the printingfilml,sothat theinkcannotreliablybetransferred to the concave parts of the printing film surface, thereby inducing omission of print in the form of flecks. Another surface ofthebasematerial 3 not incontact with the pressure sensitiveadhesivelayer 2 comes intocontact withthesurface . CA 022~072 1998-11-10 of the printing film l by the windingofthe pressuresensitive adhesive film in the form of a roll in the manufacturing process.Itispreferablethatthesurfaceofthebasematerial 3 not in contact with the pressure sensitive adhesive layer 2 is also set to have a surface roughness of 20~m or less.
The reason for this is that ifthe surface of the base material 3 not in contact with the pressure sensitive adhesive layer 2 has a surface roughness over 20~m, such large unevenness of the surface of the base material 3 is transferred to the surface of the printing film l during a long-time storage of the pressure sensitive adhesive film in the form of a roll thereby degrading the evenness of the printing film surface.
Fig. l shows the case where the base material 3 is formed of a released paper.
A release agent such as a silicon-based release agent is applied to at least the surface of the base material 3 in contact with the pressure sensitive adhesive layer 2. This is for ease release of the printing film l from the base material 3 when the printing film l is applied to an adherend.
If the release agent is also applied to the other surface of the base material 3 not in contact with the pressure sensitive adhesive layer 2, when the entire pressure sensitive adhesive film is wound in the form of a roll and is stored for a long time, it can be prevented that the base material 3 is cohered with the printing film l to become hard to remove from it and that they cause a delamination when unwound.
Next, examples of the invention will be described CA 022~072 1998-11-10 together with comparative examples.
Resin compositions formed of Compounding ratio A and Compounding ratio B, respectively, as mentioned below were prepared. With the use of these resin compositions, printing 5 films 1 as shown in Fig. 1 which have a thickness of 60 ,u m and a thickness of lOO,um, respectively, were obtained through calendering. The stiffness of the printing film 1 obtained from Compounding ratio A was, on the basis of a modulus with respect to a 100% elongation thereof, 1.75 kg/mm2 10 in a vertical direction and 1.50 kg~mm2 in a lateral direction.
The stiffness of the printing film l obtained from Compounding ratio B was, on the basis of a modulus with respect to a 100%
elongation thereof, 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction. Meanwhile, acrylic 15 pressure sensitive adhesive was applied to respective surfaces of base materials 3 of three types C, D and E on which a release agent had been applied, and the base materials 3 were then dried, thereby forming respective pressure sensiti-ve adhesive layers 2 with a thickness of 30 ,um. Each 20 of the base materials 3 thus obtained and the printing film 1 mentioned above were laminated with the pressure sensitive adhesive layer 2 directed toward the printing film l, thereby obtaining pressure sensitive adhesive films for thermal transfer printing of Examples 1 and 2 and Comparative examples 25 1 to 6. To respective films thus obtained, visual evaluation was made about omission of print and conformability to a curved surface. The evaluation results are shown in Table 1. In the .- CA 022~072 1998-11-10 table, a circular mark (O) indicates that the evaluation result was good, an triangular mark ( ~ ) indicates that imperfections were studded, and a cross mark (X) indicates that the evaluation result was bad as a whole.
<Resin composition of printing film 1>
(Compounding ratio A) PVC (mean polymerization degree of 1050) 100 phr Plasticizer (DOP) 28 phr Heat stabilizer 3 phr Processing aid 1 phr Colorant (titanium oxide) 8 phr (Compounding ratio B) PVC (mean polymerization degree of 1050) 100 phr Plasticizer (DOP) 38 phr Heat stabilizer 3 phr Processing aid 1 phr Colorant (titanium oxide) 8 phr <Types of base material 3 Type C
Released paper made of woodfree paper basis weight: 46 kg/m2 thickness: approximately 50 ~m surface roughness in contact with pressure sensitive adhesive layer: l9.9~m surface roughness not in contact with pressure sensitive adhesive layer: 23.6~m Type D
CA 022~072 1998-11-10 Polyethylene terephthalate resin film whose back face is subjected to sand matting (PET38 produced by NIPPA Kabushiki Kaisha) thickness: 38 ~m surface roughness in contact with pressure sensitive adhesive layer: 3.2~m surface roughness not in contact with pressure sensitive adhesive layer: 3.9~m Type E
Released paper made of woodfree paper basis weight: 64 kg/m2 thickness: approximately lOO~m surface roughness in contact with pressure sensitive adhesive layer: 10.2~m surface roughness not in contact with pressure sensitive adhesive layer: l9.9~m [Table 1]
invention Comparative example Compounding ratio of A A A A A B B B
printinq film Thickness of printing film 100 lO0 100 60 60 60 60 100 (~m) C D E C E C E E
type Omission ofo O ~ ~ X ~ X
print Conformability to curvedO O O O O O O O
surface . CA 022~072 1998-11-10 As seen from Table 1, Examples 1 and 2 of the invention cause no omission of print and perfectly fit on the curved surface of the adherend to perform excellent conformability.
5Comparative example 1 causes omission of print at some points. This is because the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2so that the print head could not sufficiently press the convex parts of the surface of the printing film 10 1.
Comparative example 2 also causes omission of print at some points as in Comparative example 1. This is because the thickness of the printing film l was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin.
Comparative example 3 causes omission of print at many points. This is because the thickness of the printing film 1 was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not sufficiently press the convex parts of the surface of the printing film l.
Comparative example 4 causes omission of print at some points. This is because the thickness of the printing film l was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin and the stiffness of the . CA 022~072 1998-11-10 printing film 1 was set, on the basis of a modulus with respect to a 100% elongation thereof, at 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible.
Comparative example 5 causes omission of print at many points. ThiS is because the thickness of the printing film 1 was set at 60 ~m under the lowermost suitable-value of 70 ~m so that the film was too thin,the stiffness oftheprinting film 1 was set, on the basis of a modulus with respect to a 100% elongationthereof,atl.35kg/mm2inaverticaldirection and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible, and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not sufficiently press the convex parts of the surface of the printing film 1.
Comparative example 6 causes omission of print at some points. This is because the stiffness of the printing film 1 was set, on the basis of a modulus with respect to a 100%
elongation thereof, at 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible, and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not - CA 022~072 1998-11-10 sufficiently press the convex parts of the surface of the printing film l.
As mentioned so far, according to the present invention, since polyvinyl chloride film is used as the printing film of the pressure sensitive adhesive film for thermal transfer printing and the stiffness of the printing film corresponds to a modulus of l.4 to 4.0 kg/mm2 with respect to a lOO%
elongation thereof, the printing film can ensure a moderate flexibility thereby reliably fitting it on the curved surface of an adherend, and the surface of the printing film cannot be affected by the surface roughness of the base material therebypreventingomissionofprint.Inaddition,thequality of material of the printing film ensures weather resistance.
PRESSURE SENSITIVE ADHESIVE FILM
[Technical Field]
This invention relates to a pressure sensitive adhesive film for thermal transfer printing.
lBackground Art]
A pressure sensitive adhesive film for thermal transfer printing has a laminated structure formed of three layers of a printing film, a pressure sensitive adhesive layer and a base material. When the pressure sensitive adhesive film is put intouse,printing is madeontheprinting filmbyathermal transfer method, the base material is released from the pressure sensitive adhesive layer and the pressure sensitive adhesive layer is then pressure sensitively adhered to an adherend so as not to be removed from it. In this manner, the pressure sensitive adhesive film is used for outdoor or indoor signboards or other advertising materials, or is used as stickers, marking materials and so on.
For printing films, paper or synthetic paper have been commonly used for a long time because of their low cost and ease of use. In addition to printing films made of these materials, printing films made of polyester have been developed.
Printing films made of paper or synthetic paper are not suitable for use outdoors due to their poor strength and are CA 022~072 1998-11-10 also not suitable for application to adherends having a secondary or tertiary curved surface due to their poor flexibility. On the other hand, though printing films made ofpolyesteraresufficientlybearableto useoutdoorsbecause of their sufficient strength in contrast to the paper-made printing films, they are also unsuitable for application to adherends having a secondary or tertiary curved surface due to their poor flexibility similar to the paper-made printing films.
Meanwhile, polyvinyl chloride (PVC) film is known as general-purpose resin film. Polyvinyl chloride film not only has excellent weather resistance so as to be usable outdoors but also has excellent flexibility so as to be applicable in conformity to an adherend having a secondary or tertiary curved surface. Accordingly, polyvinyl chloride film seems to be suitable for use as a printing film of a pressure sensitive adhesive film for thermal transfer printing.
However, the surface of polyvinyl chloride film used in the pressuresensitive adhesivefilmgenerally hasunevenness having the height of several ten micrometers. Therefore, a simple use of polyvinyl chloride film as the printing film induces non-transfer of ink to concave parts of the uneven surface of the film under thermal transfer printing, though allowing transfer of inkto convex parts of the uneven surface of the film. This results in omission of print in the form of flecks on the surface of the printing film, which uglifies the printed matter. Such omission ofprint exceedingly occurs . CA 022~072 1998-11-10 as the unevenness of the printing film surface is increased and as the area of concave parts of the uneven film surface is increased. Accordingly, some countermeasure against such problem is necessary in order to use polyvinyl chloride film for the printing film of the pressure sensitive adhesive film for thermal transfer printing.
[Disclosure of Invention]
The present invention has been made in view of the foregoing problem and has its object of providing a pressure sensitive adhesive film for thermal transfer printing which is excellent in printability, weather resistance and conformability to a curved surface.
To attain the above object, the present invention is characterized by specifically designing the quality of material and the stiffness of a printing film.
More specifically, the present invention is directed to a pressure sensitive adhesive film for thermal transfer printing in which a pressure sensitive adhesive layer is provided on the back surface of a printing film whose another surface is to be printed by a thermal transfer method and a basematerial is releasably providedonthepressuresensitive adhesive layer, and employs the following solutions.
A first solution of the invention is characterized in that the printing film is made of polyvinyl chloride a surface of which has microscopic concave parts and convex parts and the stiffness of the printing film corresponds to a modulus ..CA 022~072 1998-11-10 (tensile stress) of 1.4 to 4.0 kg/mm~ with respect to a 100%
elongation of the printing film so that ink is transferred to not only the microscopic convex parts but also the microscopic concave parts on the surface of the printing film by thermal transfer printing.
A second solution of the invention is characterized in that in accordance with the first solution, the stiffness of the printing film is controlled such that a specified amount of plasticizer is added to polyvinyl chloride. The amount of addition of the plasticizer preferably corresponds to 15 to 35 parts of bis(2-ethylhexyl)phthalate per hundred parts of polyvinyl chloride.
Under each of the arrangements of the first and second solutions of the inventionl the printing film ensures a moderate flexibility so as to reliably fit on a curved surface of an adherend. Further, the surface of the printing film is not affected by the surface roughness of the base material, thereby causing no omission of print in the form of flecks.
Furthermore, the printing film is sufficiently bearable to use outdoors because of excellent weather resistance of polyvinyl chloride.
A third solution of the invention is characterized in that in accordance with the first solution, the thickness of the printing film is set at 70 to 150 ~m.
25Under the arrangement of the third solution of the invention, the surface of the printing film can be surely prevented from the influence of the surface roughness of the . CA 022~072 1998-11-10 base material without impairment of the flexibility of the printing film.
A fourth solution of the invention is characterized in that in accordance with the first solution, the base material is formed of a released paper having a basis weight of 50 g/m2 or less.
A fifth solution of the invention is characterized in that in accordance with the first solution, the base material is made of resin film whose surface in contact with the pressure sensitive adhesive layer has a surface roughness of 20 ~m or less.
Under each of the arrangements of the fourth and fifth solutions of the invention, the pressure of a print head in thermal transfer printing is transmitted uniformly to the entire surface of the printing film so that convex parts of the surface of the printing film are sufficiently pressed by the print head. This surely transfers ink to concave parts of the surface of the printing film without the occurrence of omission of print. Through the winding of the pressure sensitive adhesive film in the form of a roll in the manufacturing process, another surface of the base material not in contact with the pressure sensitive adhesive layer comes into contact with the surface of the printing film. When the surface of the base material not in contact with the pressuresensitiveadhesivelayeralso hasasurfaceroughness of 20~m or less, such small roughness has very little effect on the surface of the printing film even if the pressure CA 022~072 1998-11-10 sensitive adhesive film is stored in the form of a roll for a long time.
A sixth solution of the invention is characterized in that in accordance with the first solution, a release agent isapplied toatleastasurfaceofthebasematerial incontact with the pressure sensitive adhesive layer.
Under the arrangement of the sixth solution of the invention, when the printing film is applied to the adherend, the film can be readily released from the base material. When the release agent is applied to another surface of the base material not in contact with the pressure sensitive adhesive layer as well as the surface in contact with it, even during a long-time storage of the pressure sensitive adhesive film in the form of a roll, it can be prevented that the base material is cohered with the printing film to become hard to remove from it. Further, no delamination occurs in the printing film and the base material when the pressure sensitive adhesive film is unwound.
[Brief Description of Drawing~
Fig. l is a cross-sectional view of a pressure sensitive adhesive film for thermal transfer printing.
[Best Mode for Carrying Out the Invention]
Description is made below about an embodiment of the present invention with reference to the drawing.
Fig. l shows a pressure sensitive adhesive film for CA 022~072 1998-11-10 thermal transfer printing according to an embodiment of the present invention. In the figure, a reference numeral l denotes a printing film to be printed by a thermal transfer method. A pressure sensitive adhesive layer 2 is provided on the back surface(asurface oppositeto asurfacefor printing) of the printing film l. A base material 3 is releasably provided on the pressure sensitive adhesive layer 2.
The printing film l is made of polyvinyl chloride. The stiffness of the printing film l is controlled to correspond to a modulus of l.4 to 4.0 kg~mm' with respect to a 100%
elongation thereof in such a manner that an amount of plasticizer in the composition of the polyvinyl chloride film is set at 15 to 35 phr on the basis of bis(2-ethylhexyl)phthalate (DOP) which is one of ester phthalate plasticizers with respect to polyvinyl chloride of l00 phr.
The plasticizer applicable to the present invention is not limited to ester phthalate plasticizers. Various kinds of other plasticizers such as polyester plasticizers, ester phosphorate plasticizers and epoxy plasticizers may be applicable. In short, it is essential only that the plasticizer is added such that the stiffness of the printing film l corresponds to a modulus of l.4 to 4.0 kg/mm2 with respect to a 100% elongation thereof. In particular, when the polyester plasticizer is used for the printing film, ink transferred on the surface for printing cannot substantially be removed even through the peeling test using a cellophane tape and scratching and substantially causes no bleeding, and CA 022~072 1998-11-10 the printing film performs excellent printability, longshelf life, excellent fogging resistance and stable stiffness. An example of polyester plasticizers is W-305 produced by DaiNippon Ink And Chemicals, Inc. Here, the modulus with respect to a 100% elongation of the printing film l means a modulus when a sample piece of printing film 1 is elongated at 100%.
As mentioned above, the stiffness of the printing film 1 is set to a modulus of 1.4 to 4.0 kg/mm2 with respect to a 100% elongation thereof. The reason for this is that if the stiffness is less than 1.4 kg/mm~, the printing film 1 is too flexiblesothatthesurfacethereofis affectedby thesurface roughness of the base material 3 thereby causing omission of print and on the contrary, if the stiffness is more than 4.0 kg/mm~, the printing film l is too hard so that reliable fit thereof on the curved surface of an adherend becomes difficult.
The thickness of the printing film 1 is set at 70 to 150 ~m. The reason for this is that if the thickness is less than 70~m, the printing film 1 is too thin so that the surface roughness, i.e., unevenness, of the base material 3 emerges on the surface (surface for printing) of the printing film 1 thereby inducing omission of print and on the contrary, if thethickness ismorethan 150 ~m, theprinting film lperforms poor flexibility so that reliable fit thereof on the curved surface of an adherend becomes difficult. Since the printing film 1 is made of polyvinyl chloride excellent in weather . CA 022~072 1998-11-10 resistance, it can sufficiently be bearable to use outdoors.
For the pressure sensitive adhesive layer 2, acrylic pressure sensitive adhesives generally used for such kind of pressure sensitive adhesive films are preferable. However, the material for the pressure sensitive adhesive layer 2 is not limited to acrylic pressure sensitive adhesives.
The base material 3 is formed of a released paper typically made of woodfree paper or glassine paper or is made of resin film typified by polyester or polypropylene film.
When the base material 3 is formed of a released paper, a released paper having a basis weight of 50 g/m2 or less is used. On the other hand, when the base material 3 is made of resin film, resin film in which the surface roughness of at least the surface in contact with the pressure sensitive adhesive layer 2 is set at 20 ~m or less is used. The reason for this is that if the released paper has a basis weight over 50 g/m2 or the surface roughness of the resin film surface in contact with the pressure sensitive adhesive layer 2 is over 20 ~m, thepressure of the print head in thermal transfer printing becomes hard to transmit uniformly to the entire printing film 1 and therefore the print head cannot sufficiently press the convex parts of the surface of the printingfilml,sothat theinkcannotreliablybetransferred to the concave parts of the printing film surface, thereby inducing omission of print in the form of flecks. Another surface ofthebasematerial 3 not incontact with the pressure sensitiveadhesivelayer 2 comes intocontact withthesurface . CA 022~072 1998-11-10 of the printing film l by the windingofthe pressuresensitive adhesive film in the form of a roll in the manufacturing process.Itispreferablethatthesurfaceofthebasematerial 3 not in contact with the pressure sensitive adhesive layer 2 is also set to have a surface roughness of 20~m or less.
The reason for this is that ifthe surface of the base material 3 not in contact with the pressure sensitive adhesive layer 2 has a surface roughness over 20~m, such large unevenness of the surface of the base material 3 is transferred to the surface of the printing film l during a long-time storage of the pressure sensitive adhesive film in the form of a roll thereby degrading the evenness of the printing film surface.
Fig. l shows the case where the base material 3 is formed of a released paper.
A release agent such as a silicon-based release agent is applied to at least the surface of the base material 3 in contact with the pressure sensitive adhesive layer 2. This is for ease release of the printing film l from the base material 3 when the printing film l is applied to an adherend.
If the release agent is also applied to the other surface of the base material 3 not in contact with the pressure sensitive adhesive layer 2, when the entire pressure sensitive adhesive film is wound in the form of a roll and is stored for a long time, it can be prevented that the base material 3 is cohered with the printing film l to become hard to remove from it and that they cause a delamination when unwound.
Next, examples of the invention will be described CA 022~072 1998-11-10 together with comparative examples.
Resin compositions formed of Compounding ratio A and Compounding ratio B, respectively, as mentioned below were prepared. With the use of these resin compositions, printing 5 films 1 as shown in Fig. 1 which have a thickness of 60 ,u m and a thickness of lOO,um, respectively, were obtained through calendering. The stiffness of the printing film 1 obtained from Compounding ratio A was, on the basis of a modulus with respect to a 100% elongation thereof, 1.75 kg/mm2 10 in a vertical direction and 1.50 kg~mm2 in a lateral direction.
The stiffness of the printing film l obtained from Compounding ratio B was, on the basis of a modulus with respect to a 100%
elongation thereof, 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction. Meanwhile, acrylic 15 pressure sensitive adhesive was applied to respective surfaces of base materials 3 of three types C, D and E on which a release agent had been applied, and the base materials 3 were then dried, thereby forming respective pressure sensiti-ve adhesive layers 2 with a thickness of 30 ,um. Each 20 of the base materials 3 thus obtained and the printing film 1 mentioned above were laminated with the pressure sensitive adhesive layer 2 directed toward the printing film l, thereby obtaining pressure sensitive adhesive films for thermal transfer printing of Examples 1 and 2 and Comparative examples 25 1 to 6. To respective films thus obtained, visual evaluation was made about omission of print and conformability to a curved surface. The evaluation results are shown in Table 1. In the .- CA 022~072 1998-11-10 table, a circular mark (O) indicates that the evaluation result was good, an triangular mark ( ~ ) indicates that imperfections were studded, and a cross mark (X) indicates that the evaluation result was bad as a whole.
<Resin composition of printing film 1>
(Compounding ratio A) PVC (mean polymerization degree of 1050) 100 phr Plasticizer (DOP) 28 phr Heat stabilizer 3 phr Processing aid 1 phr Colorant (titanium oxide) 8 phr (Compounding ratio B) PVC (mean polymerization degree of 1050) 100 phr Plasticizer (DOP) 38 phr Heat stabilizer 3 phr Processing aid 1 phr Colorant (titanium oxide) 8 phr <Types of base material 3 Type C
Released paper made of woodfree paper basis weight: 46 kg/m2 thickness: approximately 50 ~m surface roughness in contact with pressure sensitive adhesive layer: l9.9~m surface roughness not in contact with pressure sensitive adhesive layer: 23.6~m Type D
CA 022~072 1998-11-10 Polyethylene terephthalate resin film whose back face is subjected to sand matting (PET38 produced by NIPPA Kabushiki Kaisha) thickness: 38 ~m surface roughness in contact with pressure sensitive adhesive layer: 3.2~m surface roughness not in contact with pressure sensitive adhesive layer: 3.9~m Type E
Released paper made of woodfree paper basis weight: 64 kg/m2 thickness: approximately lOO~m surface roughness in contact with pressure sensitive adhesive layer: 10.2~m surface roughness not in contact with pressure sensitive adhesive layer: l9.9~m [Table 1]
invention Comparative example Compounding ratio of A A A A A B B B
printinq film Thickness of printing film 100 lO0 100 60 60 60 60 100 (~m) C D E C E C E E
type Omission ofo O ~ ~ X ~ X
print Conformability to curvedO O O O O O O O
surface . CA 022~072 1998-11-10 As seen from Table 1, Examples 1 and 2 of the invention cause no omission of print and perfectly fit on the curved surface of the adherend to perform excellent conformability.
5Comparative example 1 causes omission of print at some points. This is because the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2so that the print head could not sufficiently press the convex parts of the surface of the printing film 10 1.
Comparative example 2 also causes omission of print at some points as in Comparative example 1. This is because the thickness of the printing film l was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin.
Comparative example 3 causes omission of print at many points. This is because the thickness of the printing film 1 was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not sufficiently press the convex parts of the surface of the printing film l.
Comparative example 4 causes omission of print at some points. This is because the thickness of the printing film l was set at 60 ~m under the lowermost suitable value of 70 ~m so that the film was too thin and the stiffness of the . CA 022~072 1998-11-10 printing film 1 was set, on the basis of a modulus with respect to a 100% elongation thereof, at 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible.
Comparative example 5 causes omission of print at many points. ThiS is because the thickness of the printing film 1 was set at 60 ~m under the lowermost suitable-value of 70 ~m so that the film was too thin,the stiffness oftheprinting film 1 was set, on the basis of a modulus with respect to a 100% elongationthereof,atl.35kg/mm2inaverticaldirection and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible, and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not sufficiently press the convex parts of the surface of the printing film 1.
Comparative example 6 causes omission of print at some points. This is because the stiffness of the printing film 1 was set, on the basis of a modulus with respect to a 100%
elongation thereof, at 1.35 kg/mm2 in a vertical direction and 1.20 kg/mm2 in a lateral direction under the lowermost suitable value of 1.4 kg/mm2 in both the directions so that the film was too flexible, and the released paper as a base material 3 had a basis weight of 64 g/m2 over the uppermost suitable value of 50 g/m2 so that the print head could not - CA 022~072 1998-11-10 sufficiently press the convex parts of the surface of the printing film l.
As mentioned so far, according to the present invention, since polyvinyl chloride film is used as the printing film of the pressure sensitive adhesive film for thermal transfer printing and the stiffness of the printing film corresponds to a modulus of l.4 to 4.0 kg/mm2 with respect to a lOO%
elongation thereof, the printing film can ensure a moderate flexibility thereby reliably fitting it on the curved surface of an adherend, and the surface of the printing film cannot be affected by the surface roughness of the base material therebypreventingomissionofprint.Inaddition,thequality of material of the printing film ensures weather resistance.
Claims (7)
1. A pressure sensitive adhesive film for thermal transfer printing in which a pressure sensitive adhesive layer is provided on the back surface of a printing film whose another surface is to be printed by a thermal transfer method and a base material is releasably provided on the pressure sensitive adhesive layer, wherein the printing film is made of polyvinyl chloride a surface of which has microscopic concave parts and convex parts, and the stiffness of the printing film corresponds to a modulus of 1.4 to 4.0 kg/mm2 with respect to a 100% elongation thereof so that ink is transferred to not only the microscopic convex parts but also the microscopic concave parts on the surface of the printing film by thermal transfer printing.
2. A pressure sensitive adhesive film for thermal transfer printing according to claim 1, characterized in that the stiffness of the printing film is controlled such that a specified amount of plasticizer is added to polyvinyl chloride.
3. A pressure sensitive adhesive film for thermal transfer printing according to claim 2, characterized in that the amount of addition of the plasticizer corresponds to 15 to 35 parts of bis(2-ethylhexyl)phthalate per hundred parts of polyvinyl chloride.
4. A pressure sensitive adhesive film for thermal transfer printing according to claim 1, characterized in that the thickness of the printing film is set at 70 to 150 µm.
5. A pressure sensitive adhesive film for thermal transfer printing according to claim 1, characterized in that the base material is formed of a released paper having a basis weight of 50 g/m2 or less.
6. A pressure sensitive adhesive film for thermal transfer printing according to claim 1, characterized in that the base material is made of resin film of which at least a surface in contact with the pressure sensitive adhesive layer has a surface roughness of 20 µm or less.
7. A pressure sensitive adhesive film for thermal transfer printing according to claim 1, characterized in that a release agent is applied to at least a surface of the base material in contact with the pressure sensitive adhesive layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8/313246 | 1996-11-25 | ||
| JP8313246A JP3016739B2 (en) | 1996-11-25 | 1996-11-25 | Adhesive film for thermal transfer printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2255072A1 true CA2255072A1 (en) | 1998-06-04 |
Family
ID=18038887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002255072A Abandoned CA2255072A1 (en) | 1996-11-25 | 1997-10-29 | Self-adhesive film for thermal printing |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3016739B2 (en) |
| KR (1) | KR20000010937A (en) |
| AU (1) | AU4726097A (en) |
| CA (1) | CA2255072A1 (en) |
| WO (1) | WO1998023450A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200251366Y1 (en) * | 2001-07-09 | 2001-11-17 | 성정환 | Glass attachment sheet for advertisement purpose |
| GB202002654D0 (en) * | 2020-02-25 | 2020-04-08 | Diamond Photofoil Ltd | A system and materials for adhesive coating |
| KR102516398B1 (en) * | 2022-07-26 | 2023-04-03 | (주)미디어폴리텍 | Film structure for print and manufacturing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2857152B2 (en) * | 1987-06-29 | 1999-02-10 | 大日本印刷株式会社 | Heat transfer sheet |
| JP3060548B2 (en) * | 1991-01-22 | 2000-07-10 | 三菱化学株式会社 | Image transfer paper for thermal transfer |
| JPH05201161A (en) * | 1992-01-24 | 1993-08-10 | Oji Paper Co Ltd | Dye thermal-transfer image receiving sheet |
| JP3089815B2 (en) * | 1992-04-28 | 2000-09-18 | 王子製紙株式会社 | Dye thermal transfer image receiving sheet and method for producing the same |
| JPH07179078A (en) * | 1993-12-21 | 1995-07-18 | Oji Yuka Synthetic Paper Co Ltd | Thermal transfer image receiving sheet |
-
1996
- 1996-11-25 JP JP8313246A patent/JP3016739B2/en not_active Expired - Fee Related
-
1997
- 1997-10-29 CA CA002255072A patent/CA2255072A1/en not_active Abandoned
- 1997-10-29 KR KR1019980709085A patent/KR20000010937A/en not_active Application Discontinuation
- 1997-10-29 WO PCT/JP1997/003960 patent/WO1998023450A1/en not_active Application Discontinuation
- 1997-10-29 AU AU47260/97A patent/AU4726097A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JP3016739B2 (en) | 2000-03-06 |
| KR20000010937A (en) | 2000-02-25 |
| AU4726097A (en) | 1998-06-22 |
| WO1998023450A1 (en) | 1998-06-04 |
| JPH10151695A (en) | 1998-06-09 |
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