WO2015072119A1 - Transfer film for in-mold molding and molded article using same - Google Patents

Transfer film for in-mold molding and molded article using same Download PDF

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Publication number
WO2015072119A1
WO2015072119A1 PCT/JP2014/005605 JP2014005605W WO2015072119A1 WO 2015072119 A1 WO2015072119 A1 WO 2015072119A1 JP 2014005605 W JP2014005605 W JP 2014005605W WO 2015072119 A1 WO2015072119 A1 WO 2015072119A1
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layer
mold
transfer film
film
resin
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PCT/JP2014/005605
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French (fr)
Japanese (ja)
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啓佑 松田
渡邉 学
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凸版印刷株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/40Layered products comprising a layer of synthetic resin comprising polyurethanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/28Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/283Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered 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
    • B32B7/04Interconnection of layers
    • B32B7/06Interconnection of layers permitting easy separation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14827Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using a transfer foil detachable from the insert
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/30Properties of the layers or laminate having particular thermal properties
    • B32B2307/306Resistant to heat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/406Bright, glossy, shiny surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/408Matt, dull surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/748Releasability
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00Electrical equipment

Definitions

  • the present invention relates to a transfer film for in-mold molding and a molded product using the same.
  • Patent Document 1 discloses a transfer film used for matting the surface of a molded product molded by resin injection.
  • the present invention is intended to solve such problems, and the desired glossy shape and matte finish gloss without generating cracks in the hard coat layer provided on the surface of the molded product transferred in-mold. It is intended to provide an in-mold transfer film that can express the above and a molded product using the same.
  • the concavo-convex forming layer is provided on the surface opposite to the release layer of the base film, the concavo-convex along the concavo-convex pattern is transferred to the surface of the molded product during transfer depending on the thickness of the resin constituting the concavo-convex forming layer. Can be formed. Thereby, even when various uneven patterns are formed on the surface of the molded product, it is not necessary to prepare a large number of injection molds, and the cost of mold production can be reduced. Moreover, since the uneven
  • the release layer when an acrylic urethane resin generated from a crosslinking reaction between at least an acrylic polyol resin, an acrylic silicon resin containing a hydroxyl group, and an isocyanate compound is used for the release layer, the release layer can be used at a low temperature of about room temperature to about 50 ° C. The curing reaction is complete. For this reason, a release layer with little heat load to a base film can be produced.
  • a cellulose derivative is included in the release layer, the heat resistance is improved even in the case of in-mold transfer that is transferred simultaneously with injection molding, that is, in-mold transfer that requires heat resistance at high temperatures. Blocking can be suppressed.
  • the release layer includes an acrylic resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms
  • the release property and stretchability of the release layer can be improved.
  • coating of the coating liquid for mold release layers for forming a mold release layer improves, a uniform mold release layer can be formed.
  • the transfer film for in-mold molding is a transfer film for plastic decorative molding in which, for example, a release layer, a hard coat layer, a decorative layer, and an adhesive layer are formed on a base film serving as a base material.
  • FIG. 1 is a schematic cross-sectional view showing the structure of an in-mold transfer film according to an embodiment of the present invention.
  • In-mold molding transfer film (hereinafter simply referred to as “matt-like in-mold molding transfer”), which can impart a concavo-convex pattern to the molding resin and can impart a matte gloss to the surface of the molding resin.
  • 100 is a laminate including at least a base film 1, a release layer 2, a hard coat layer 3, and an adhesive layer 5, and the release layer 2 of the base film 1.
  • a concave / convex forming layer 6 is formed on the opposite side of the surface.
  • the decorative layer 4 may be provided between the hard coat layer 3 and the adhesive layer 5.
  • the decoration layer 4 is often a plurality of layers, and for example, a decoration material having an optical effect such as embossing or a pearl pigment can also be included.
  • a decoration material having an optical effect such as embossing or a pearl pigment can also be included.
  • the decoration layer 4 when the decoration layer 4 has sufficient adhesiveness with respect to a molded article, it is not necessary to provide the contact bonding layer 5.
  • the details of each of the layers constituting the mat-like in-mold transfer film 100 will be described.
  • the release layer 2 containing the silicone-modified acrylic urethane resin for example, an acrylic polyol resin, a coating liquid composition containing an acrylic silicon resin containing a hydroxyl group and an isocyanate compound, There is a method of applying to the surface and then crosslinking.
  • the recommended compounding quantity of the acrylic silicone resin containing a hydroxyl group exists in the range of 2 weight% or more and 30 weight% or less with respect to acrylic polyol resin, it does not specifically limit.
  • the release layer 2 can be lightly peeled without lowering the top coatability by blending the release layer 2 with an acrylic urethane resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms. If the number of carbon atoms is less than 10, the releasability at the time of thermal transfer is insufficient, and transfer unevenness may occur on the surface of the substrate to be transferred, resulting in a quality defect.
  • the concavo-convex formation layer 6 is a layer formed by printing a concavo-convex pattern by, for example, a gravure printing method or a screen printing method.
  • a thermosetting resin or an ultraviolet curable resin that can withstand heat and pressure received during transfer can be used.
  • corrugated formation layer 6 containing a thermosetting resin or an ultraviolet curable resin is methods other than the said gravure printing method, for example, gravure coating method, roll coating method, knife coating method, silk screen printing method, and other normal coatings It may be formed by embossing the above-mentioned thermosetting resin or ultraviolet curable resin after coating by a method or a printing method.

Landscapes

  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The objective of the present invention is to provide: a transfer film that is for in-mold molding and that can express a desired bumpy pattern or matte-tone finish without causing cracks in a hard coating layer provided to the surface of a molded article subjected to in-mold transfer; and a molded article using the transfer film. The transfer film (100) for in-mold molding results from laminating, in the given order, at least a separation layer (2), a hard coating layer (3), and an adhesive layer (5) at one surface of a base film (1), the separation layer (2) contains a filler, and a bumpiness-forming layer (6) is provided that is formed from a silicone-modified acrylic urethane resin and is at the surface of the base film (1) at the reverse side from the separation layer (2).

Description

インモールド成形用転写フィルム及びそれを用いた成形品Transfer film for in-mold molding and molded product using the same
 本発明は、インモールド成形用転写フィルム及びそれを用いた成形品に関する。 The present invention relates to a transfer film for in-mold molding and a molded product using the same.
 樹脂の射出によって成形された成形品の表面をマット調にするために用いられる転写フィルムには、例えば、特許文献1に記載されたものがある。 For example, Patent Document 1 discloses a transfer film used for matting the surface of a molded product molded by resin injection.
特開2004-122756号公報JP 2004-122756 A
 上記成形品の表面に凹凸パターンを形成する場合、転写フィルムは成形品表面の凹凸形状に追従できなければならないため、その転写フィルムには高い延伸性が要求される。
 しかしながら、凹凸パターンを有する成形品表面をマット調にするために、例えば、メラミン樹脂を含んだ離型層にフィラーを添加すると、転写フィルムの延伸性が失われ、成形品表面に転写されたハードコート層にクラックが発生することがあるといった課題があった。
 本発明は、このような課題を解決しようとするものであり、インモールド転写した成形品の表面に設けられたハードコート層にクラックを発生させることなく、所望の凹凸形状やマット調の仕上がり光沢を表現できるインモールド成形用転写フィルム及びそれを用いた成形品を提供しようとするものである。
When forming a concavo-convex pattern on the surface of the molded product, the transfer film must be able to follow the concavo-convex shape on the surface of the molded product, so that the transfer film is required to have high stretchability.
However, for example, when a filler is added to a release layer containing a melamine resin in order to make the surface of a molded product having a concavo-convex pattern matte, the stretchability of the transfer film is lost, and the hard surface transferred to the surface of the molded product is lost. There was a problem that cracks may occur in the coat layer.
The present invention is intended to solve such problems, and the desired glossy shape and matte finish gloss without generating cracks in the hard coat layer provided on the surface of the molded product transferred in-mold. It is intended to provide an in-mold transfer film that can express the above and a molded product using the same.
 本発明は上記課題を解決するために鋭意研究されたものであり、以下のような手段で達成される。
 本発明の一態様は、ベースフィルムの一方の面に、少なくとも離型層と、ハードコート層と、接着層と、をこの順で積層したインモールド成形用転写フィルムであって、前記離型層は、フィラーを含み、且つシリコーン変性アクリルウレタン樹脂で形成され、前記ベースフィルムの前記離型層とは反対側の面に、凹凸形成層を設けたことを特徴とするインモールド成形用転写フィルムである。
The present invention has been intensively studied to solve the above-described problems, and is achieved by the following means.
One aspect of the present invention is an in-mold transfer film in which at least a release layer, a hard coat layer, and an adhesive layer are laminated in this order on one surface of a base film, the release layer Is a transfer film for in-mold molding comprising a filler, formed of a silicone-modified acrylic urethane resin, and provided with a concavo-convex forming layer on a surface opposite to the release layer of the base film. is there.
 本発明の一態様に係るインモールド成形用転写フィルムによれば、インモールド転写した成形品の表面に設けられたハードコート層にクラックを発生させることなく、所望の凹凸形状やマット調の仕上がり光沢を表現できるインモールド成形用転写フィルム及びそれを用いた成形品を提供することが可能となる。より詳しくは、本発明の一態様に係るインモールド成形用転写フィルムを使用すれば、離型層がシリコーン変性アクリルウレタン樹脂で形成されているので、熱転写時に優れた離型性を呈し、且つ、優れた延伸性を呈する。このため、凹凸パターンを有し、且つマット調の仕上がり光沢を備える成形品表面において、ハードコート層にクラックが発生するのを防止できるマット調インモールド成形用転写フィルム及びそれを用いた成形品を提供することができる。 According to the transfer film for in-mold molding according to one aspect of the present invention, a desired uneven shape and a glossy finish with a matte tone are generated without generating a crack in the hard coat layer provided on the surface of the molded product transferred in-mold. It is possible to provide an in-mold transfer film that can express the above and a molded product using the same. More specifically, if the transfer film for in-mold molding according to one embodiment of the present invention is used, the release layer is formed of a silicone-modified acrylic urethane resin, and thus exhibits excellent release properties during thermal transfer, and Excellent stretchability. Therefore, a mat-like in-mold transfer film capable of preventing the hard coat layer from cracking on the surface of a molded product having a concavo-convex pattern and having a matte finish gloss and a molded product using the same Can be provided.
 また、ベースフィルムの離型層とは反対側の面に凹凸形成層を設けているため、転写時に、凹凸形成層を構成する樹脂の厚みにより、その凹凸パターンに沿った凹凸を成形品の表面に形成することができる。これにより、多様な凹凸パターンを成形品表面に形成する場合であっても、多数の射出成形用金型を用意する必要がなく、金型作製のコストを削減することができる。また、従来の凹凸パターンのない射出成形用金型を使用して、成形品表面に凹凸パターンを形成することができるため、金型の交換にかかるコストを削減できて経済的である。さらに、インモールド成形用転写フィルムの絵柄と凹凸パターンとを対応させることも容易である。 In addition, since the concavo-convex forming layer is provided on the surface opposite to the release layer of the base film, the concavo-convex along the concavo-convex pattern is transferred to the surface of the molded product during transfer depending on the thickness of the resin constituting the concavo-convex forming layer. Can be formed. Thereby, even when various uneven patterns are formed on the surface of the molded product, it is not necessary to prepare a large number of injection molds, and the cost of mold production can be reduced. Moreover, since the uneven | corrugated pattern can be formed in the molded article surface using the conventional injection mold without an uneven | corrugated pattern, the cost concerning replacement | exchange of a metal mold | die can be reduced and it is economical. Furthermore, it is easy to make the pattern of the transfer film for in-mold molding correspond to the concavo-convex pattern.
 また、離型層に、少なくともアクリルポリオール樹脂と、水酸基を含有するアクリルシリコン樹脂と、イソシアネート化合物との架橋反応から生成されたアクリルウレタン樹脂を用いた場合には、室温~50℃程度の低温で硬化反応が終了する。このため、ベースフィルムへの熱負荷の少ない離型層を作製することができる。
 また、離型層にセルロース誘導体を含めた場合には、射出成形と同時に転写するインモールド転写、すなわち高温での耐熱性が要求されるインモールド転写の場合でも耐熱性が向上し、熱シワやブロッキングを抑制することができる。
 また、離型層に水酸基及び炭素数10以上30以下の長鎖アルキル基を有するアクリル樹脂を含めた場合には、離型層の離型性と延伸性とを向上させることができる。さらに、離型層を形成するための離型層用塗布液の塗布時におけるレベリング性が向上するため、均一な離型層を形成することができる。
In addition, when an acrylic urethane resin generated from a crosslinking reaction between at least an acrylic polyol resin, an acrylic silicon resin containing a hydroxyl group, and an isocyanate compound is used for the release layer, the release layer can be used at a low temperature of about room temperature to about 50 ° C. The curing reaction is complete. For this reason, a release layer with little heat load to a base film can be produced.
In addition, when a cellulose derivative is included in the release layer, the heat resistance is improved even in the case of in-mold transfer that is transferred simultaneously with injection molding, that is, in-mold transfer that requires heat resistance at high temperatures. Blocking can be suppressed.
In addition, when the release layer includes an acrylic resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms, the release property and stretchability of the release layer can be improved. Furthermore, since the leveling property at the time of application | coating of the coating liquid for mold release layers for forming a mold release layer improves, a uniform mold release layer can be formed.
本発明の実施形態に係るインモールド成形用転写フィルムの構造を示す断面概略図である。It is a cross-sectional schematic diagram which shows the structure of the transfer film for in-mold shaping | molding which concerns on embodiment of this invention. 本発明の実施形態に係るインモールド成形用転写フィルムを用いて射出成形する様子を示す断面概略図である。It is a cross-sectional schematic diagram which shows a mode that it injection-molds using the transfer film for in-mold shaping | molding which concerns on embodiment of this invention. 本発明の実施形態に係るインモールド成形用転写フィルムを転写した成形品の構造を示す断面概略図である。It is a cross-sectional schematic diagram which shows the structure of the molded product which transcribe | transferred the transfer film for in-mold shaping | molding which concerns on embodiment of this invention.
 以下の詳細な説明では、本発明の実施形態の完全な理解を提供するように多くの特定の細部について記載される。しかしながら、かかる特定の細部がなくても1つ以上の実施形態が実施できることは明らかであろう。他にも、図面を簡潔にするために、周知の構造及び装置が略図で示されている。
 まず、本実施形態に係るインモールド成形用転写フィルムと、本実施形態で用いるインモールド成形とについて、簡単に説明する。インモールド成形用転写フィルムとは、基材となるベースフィルム上に、例えば、離型層、ハードコート層、加飾層、接着層を形成したプラスチック加飾成形用の転写フィルムのことである。また、インモールド成形とは、一対の射出成形用金型間に上記転写フィルムを供給し、その射出成形用金型によって形成されるキャビティに加熱加圧した成形樹脂を充填した後、ベースフィルム及び離型層を剥離して、成形樹脂に印刷層を転写して装飾を行う成形方法をいう。
 以下、本発明の実施形態に係るインモールド成形用転写フィルム及びその転写方法について、図1から図3を参照しながら詳細に説明する。
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present invention. However, it will be apparent that one or more embodiments may be practiced without such specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
First, the in-mold molding transfer film according to the present embodiment and the in-mold molding used in the present embodiment will be briefly described. The transfer film for in-mold molding is a transfer film for plastic decorative molding in which, for example, a release layer, a hard coat layer, a decorative layer, and an adhesive layer are formed on a base film serving as a base material. Further, in-mold molding refers to supplying the transfer film between a pair of injection molding dies, filling a cavity formed by the injection molding dies with a heated molding resin, It refers to a molding method in which the release layer is peeled off and the printed layer is transferred to a molding resin for decoration.
Hereinafter, an in-mold transfer film and a transfer method thereof according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.
<全体構造>
 図1は、本発明の実施形態に係るインモールド成形用転写フィルムの構造を示す断面概略図である。本実施形態に係る、成形樹脂に凹凸パターンを付与することができ、且つその表面にマット調の光沢を付与することができるインモールド成形用転写フィルム(以下、単に「マット調インモールド成形用転写フィルム」ともいう。)100は、図1に示すように、ベースフィルム1、離型層2、ハードコート層3、接着層5を少なくとも備えた積層体であり、ベースフィルム1の離型層2とは反対側の面には凹凸形成層6が形成されている。なお、マット調インモールド成形用転写フィルム100に絵柄を付与したい場合、例えば、ハードコート層3と接着層5との間に加飾層4を設けてもよい。ここで、加飾層4は、複数層である場合が多く、例えば、エンボス加工やパール顔料などの光学効果を有する加飾材料も入れることも可能である。また、加飾層4を設ける場合、加飾層4が成形品に対して充分接着性を有する場合には、接着層5を設けなくても良い。
 以下、マット調インモールド成形用転写フィルム100を構成する上記各層の詳細について説明する。
<Overall structure>
FIG. 1 is a schematic cross-sectional view showing the structure of an in-mold transfer film according to an embodiment of the present invention. In-mold molding transfer film (hereinafter simply referred to as “matt-like in-mold molding transfer”), which can impart a concavo-convex pattern to the molding resin and can impart a matte gloss to the surface of the molding resin. As shown in FIG. 1, 100 is a laminate including at least a base film 1, a release layer 2, a hard coat layer 3, and an adhesive layer 5, and the release layer 2 of the base film 1. A concave / convex forming layer 6 is formed on the opposite side of the surface. In addition, when it is desired to give a pattern to the mat-like in-mold transfer film 100, for example, the decorative layer 4 may be provided between the hard coat layer 3 and the adhesive layer 5. Here, the decoration layer 4 is often a plurality of layers, and for example, a decoration material having an optical effect such as embossing or a pearl pigment can also be included. Moreover, when providing the decoration layer 4, when the decoration layer 4 has sufficient adhesiveness with respect to a molded article, it is not necessary to provide the contact bonding layer 5.
Hereinafter, the details of each of the layers constituting the mat-like in-mold transfer film 100 will be described.
(ベースフィルム1)
 ベースフィルム1の材料としては、例えば、ポリエステルフィルム、ポリエチレンナフタレートフィルム、ポリプロピレンフィルム、ポリエチレンフィルム、トリアセチルセルロースフィルム、ポリカーボネートフィルム、ナイロンフィルム、セロファンフィルム、アクリルフィルム、塩ビフィルムといった基材が使用可能である。また、使用可能なフィルムの厚みは、25μm以上250μm以下の範囲内であるが、凹凸パターンの付与には、38μm以上50μm以下の範囲内の厚みが好ましい。
(Base film 1)
As a material of the base film 1, for example, a substrate such as a polyester film, a polyethylene naphthalate film, a polypropylene film, a polyethylene film, a triacetyl cellulose film, a polycarbonate film, a nylon film, a cellophane film, an acrylic film, or a vinyl chloride film can be used. is there. Moreover, although the thickness of the film which can be used exists in the range of 25 micrometers or more and 250 micrometers or less, the thickness in the range of 38 micrometers or more and 50 micrometers or less is preferable for provision of an uneven | corrugated pattern.
(離型層2)
 離型層2を形成するための塗布液組成物は、シリコーン変性アクリルウレタン樹脂を含むことを特徴としている。離型層2にシリコーン変性アクリルウレタン樹脂を用いることで、離型層2は、熱転写時には優れた離型性を呈し、且つ、シリコーン変性アクリルウレタン樹脂の優れた延伸性によって、凹凸のある成形品においても、ハードコート層3に発生するクラックを低減することができる。さらに、離型層2にシリコーン変性アクリルウレタン樹脂を用いることで、例えば、ベースフィルム1にポリエステルフィルムを用いた場合でも、離型層2は、ポリエステルフィルムとの十分な密着性を確保することができる。
 シリコーン変性アクリルウレタン樹脂を含む離型層2の形成方法としては、例えば、アクリルポリオール樹脂と、水酸基を含有するアクリルシリコン樹脂とイソシアネート化合物とを含む塗布液組成物とを、ベースフィルム1の一方の面に塗布し、その後、架橋させる方法がある。なお、水酸基を含有するアクリルシリコン樹脂の推奨の配合量は、アクリルポリオール樹脂に対して2重量%以上30重量%以下の範囲内であるが、特に限定するものではない。
(Release layer 2)
The coating liquid composition for forming the release layer 2 includes a silicone-modified acrylic urethane resin. By using the silicone-modified acrylic urethane resin for the release layer 2, the release layer 2 exhibits excellent release properties during thermal transfer, and the molded product having irregularities due to the excellent stretchability of the silicone-modified acrylic urethane resin. Also, cracks generated in the hard coat layer 3 can be reduced. Further, by using a silicone-modified acrylic urethane resin for the release layer 2, for example, even when a polyester film is used for the base film 1, the release layer 2 can ensure sufficient adhesion with the polyester film. it can.
As a method for forming the release layer 2 containing the silicone-modified acrylic urethane resin, for example, an acrylic polyol resin, a coating liquid composition containing an acrylic silicon resin containing a hydroxyl group and an isocyanate compound, There is a method of applying to the surface and then crosslinking. In addition, although the recommended compounding quantity of the acrylic silicone resin containing a hydroxyl group exists in the range of 2 weight% or more and 30 weight% or less with respect to acrylic polyol resin, it does not specifically limit.
 離型層2に、例えば、無機フィラーや樹脂フィラー(以下、単に「フィラー」ともいう。)を含有させることによって、成形品表面をマット調にすることが可能である。離型層2にフィラーによる微細な凹凸を形成することで、剥離後のハードコート層3に微細な凹凸が形成され、成形品表面がマット調となる。なお、良好なマット調外観とするためには、離型層2に含有させるフィラーの粒径は、0.5μm以上15μm以下の範囲内であることが望ましい。また、離型層2の厚みは、含有させるフィラーを保持する必要があるため、フィラーの粒径に合わせて適宜設定する必要がある。例えば、2μm程度の粒径のフィラーを用いる場合、離型層2の厚みは3μmから4μm程度が望ましい。一方、離型層2の厚みによってマット感を調整することができるため、所望のマット感に合わせて離型層2の厚みを微調整する必要がある。 For example, when the release layer 2 contains an inorganic filler or a resin filler (hereinafter, also simply referred to as “filler”), the surface of the molded product can be matted. By forming fine irregularities with the filler in the release layer 2, fine irregularities are formed in the hard coat layer 3 after peeling, and the surface of the molded product has a matte tone. In order to obtain a good matte appearance, the particle size of the filler contained in the release layer 2 is desirably in the range of 0.5 μm to 15 μm. Moreover, since it is necessary to hold | maintain the filler to contain, it is necessary to set suitably the thickness of the mold release layer 2 according to the particle size of a filler. For example, when a filler having a particle size of about 2 μm is used, the thickness of the release layer 2 is preferably about 3 μm to 4 μm. On the other hand, since the mat feeling can be adjusted by the thickness of the release layer 2, it is necessary to finely adjust the thickness of the release layer 2 in accordance with a desired mat feeling.
 離型層2に使用されるフィラーとしては、種々の無機フィラーや樹脂フィラーを用いることができる。無機フィラーとしては、例えば、シリカ、カーボンブラック、酸化チタン、アルミナ、炭酸カルシウム、酸化カルシウム、沈降性バリウム、タルク、ガラスビーズ、酸化亜鉛などを使用することができる。一方、樹脂フィラーとしては、例えば、アントラキノン、フタロシアン、ジオキサジンなどを使用することができる。
 マット調インモールド成形用転写フィルム100は、転写時に160℃程度の熱がかかる。そこで、離型層2に水酸基を含有するセルロース誘導体を配合することで、耐熱性を向上することができる。本実施形態で使用することが望ましい水酸基を含有するセルロース誘導体は、例えば、ニトロセルロース、酢酸酪酸セルロース、酢酸プロピオン酸セルロースである。ここで、水酸基を含有するセルロース誘導体の配合量としては、主剤(アクリルポリオール樹脂)に対して、20重量%以上100重量%以下の範囲内が好ましい。
As the filler used for the release layer 2, various inorganic fillers and resin fillers can be used. Examples of the inorganic filler that can be used include silica, carbon black, titanium oxide, alumina, calcium carbonate, calcium oxide, precipitated barium, talc, glass beads, and zinc oxide. On the other hand, as the resin filler, for example, anthraquinone, phthalocyanine, dioxazine and the like can be used.
The mat-like in-mold transfer film 100 is heated to about 160 ° C. during transfer. Then, heat resistance can be improved by mix | blending the cellulose derivative containing a hydroxyl group with the mold release layer 2. FIG. Examples of the cellulose derivative containing a hydroxyl group that is desirably used in the present embodiment are nitrocellulose, cellulose acetate butyrate, and cellulose acetate propionate. Here, as a compounding quantity of the cellulose derivative containing a hydroxyl group, the inside of the range of 20 to 100 weight% is preferable with respect to the main ingredient (acryl polyol resin).
 また、剥離時の高速化やウレタンを含有する密着性の高いハードコート層3の場合、離型層2の剥離がより軽いことが要求される場合がある。この場合には、離型層2に水酸基及び炭素数10以上30以下の長鎖アルキル基を有するアクリルウレタン樹脂を配合することで、上塗り性を落とさずに剥離を軽くすることができる。なお、炭素数が10未満の場合には、熱転写時の離型性が不十分で被転写基材の表面に転写ムラが生じて品質欠陥となることがある。また、炭素数が30を超えると、ハードコート層用塗布液の塗布時にハジキが生じ、均一なハードコート層3を形成することができないことがある。
 離型層2に含まれる上記アクリルウレタン樹脂の適当な配合量は、主剤(アクリルポリオール樹脂)に対して、0.5重量%以上15重量%以下の範囲内である。また、この離型層2の厚みは、特に制限が無いが、0.1μm以上5μm以下の範囲内が最適である。
Further, in the case of the hard coat layer 3 having high adhesion at the time of peeling and containing urethane, it may be required that the peeling of the release layer 2 is lighter. In this case, the release layer 2 can be lightly peeled without lowering the top coatability by blending the release layer 2 with an acrylic urethane resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms. If the number of carbon atoms is less than 10, the releasability at the time of thermal transfer is insufficient, and transfer unevenness may occur on the surface of the substrate to be transferred, resulting in a quality defect. On the other hand, when the number of carbon atoms exceeds 30, repelling occurs when the hard coat layer coating solution is applied, and the uniform hard coat layer 3 may not be formed.
An appropriate blending amount of the acrylic urethane resin contained in the release layer 2 is in the range of 0.5 wt% to 15 wt% with respect to the main agent (acryl polyol resin). The thickness of the release layer 2 is not particularly limited, but is optimally in the range of 0.1 μm to 5 μm.
 以下、上述した離型層2に関する従来技術について、簡単に説明する。
 工業製品の中でも、特に電子機器の筐体の場合、表面のギラツキ防止や高級感の付与を目的として、成形品の表面をマット調にすることを求められることが多い。
 そこで、一般には、転写フィルムを用いて成形品表面をマット調にするためには、転写フィルムの離型層にフィラー(例えば、シリカ、アルミナ、炭酸カルシウムなど)を含有させ、離型層に微細な凹凸を形成することによって、剥離後のハードコート層に微細な凹凸を形成して成形品表面をマット調にするといった方法が用いられてきた(特許文献1)。
 この転写フィルムに備わる離型層には、転写後にハードコート層からの良好な剥離性を付与する機能が求められる。さらには、ハードコート層を形成する際のハードコート層用塗布液の塗布時において、ハードコート層用塗布液のハジキが発生しないこと(上塗り性)、転写時の熱に耐え得る耐熱性があること、ベースフィルム又は下地との密着が強いこと、被転写基材の形状に追従できること(延伸性)、といった性能が求められる。
Hereinafter, the prior art regarding the release layer 2 mentioned above is demonstrated easily.
Among industrial products, particularly in the case of a housing of an electronic device, it is often required that the surface of a molded product be matte for the purpose of preventing surface glare and imparting a high-class feeling.
Therefore, in general, in order to make the surface of a molded article matte using a transfer film, the release layer of the transfer film contains a filler (eg, silica, alumina, calcium carbonate, etc.) and the release layer is fine. A method has been used in which fine irregularities are formed on the hard coat layer after peeling to form a mat-like surface on the molded product by forming irregular irregularities (Patent Document 1).
The release layer provided in the transfer film is required to have a function of imparting good peelability from the hard coat layer after transfer. Furthermore, when the hard coat layer coating solution is applied when the hard coat layer is formed, the hard coat layer coating solution does not repel (overcoat property) and has heat resistance that can withstand the heat during transfer. In other words, performances such as strong adhesion to the base film or the base and the ability to follow the shape of the substrate to be transferred (stretchability) are required.
 上記要求を満足する離型層の材料としては、例えば、粘着テープの離型剤に多用されているシリコーン又はフッ素樹脂などがある。
 しかしながら、上記材料には、離型層の上に形成されるハードコート層を形成するための塗布液を塗布する際にハジキが発生し易いという課題があった。
 上記課題に対しては、離型層に、例えば、メラミン樹脂、特にアクリルメラミン樹脂を使用することで対処する場合が多い。
 ところが、例えばメラミン樹脂を含んだ離型層にフィラーを添加すると、延伸性の点で課題が生じ得る。
 この点に関し、本実施形態に係るインモールド成形用転写フィルム100であれば、離型層2をシリコーン変性アクリルウレタン樹脂で形成しているので、フィラーを添加した場合であっても、離型層2の延伸性を向上させることができる。
Examples of the release layer material that satisfies the above requirements include silicone and fluororesin that are frequently used as release agents for adhesive tapes.
However, the above material has a problem that repelling is likely to occur when a coating solution for forming a hard coat layer formed on the release layer is applied.
The above problems are often dealt with by using, for example, a melamine resin, particularly an acrylic melamine resin for the release layer.
However, for example, when a filler is added to a release layer containing a melamine resin, a problem may arise in terms of stretchability.
In this regard, in the case of the in-mold transfer film 100 according to the present embodiment, the release layer 2 is formed of a silicone-modified acrylic urethane resin, so that even if a filler is added, the release layer 2 stretchability can be improved.
(ハードコート層3)
 ハードコート層3は、転写後にベースフィルム1を剥離した際に、成形品の最表面層となる層である。ハードコート層3の材料としては、被転写基材への転写前にはタックフリー状態であり、被転写基材に転写後、例えば、紫外線やエレクトロンビームを照射することで架橋できる樹脂からなることが望ましい。転写後に架橋する理由としては、ハードコート層3を予め架橋すると転写の延伸時にクラックが生じやすく、外観不良となるためである。一方、転写前にタックフリー状態とならなければ、耐ブロッキング性と射出成形時の耐熱性が不十分となる。また、例えば、紫外線やエレクトロンビームを照射することで架橋できる樹脂を使用する理由としては、前記樹脂を使用したハードコート層3であれば、紫外線もしくはエレクトロンビームを照射することによって、直ちに成形品表面を硬化させることができるため、成形品の生産効率が向上するからである。
 ハードコート層3の厚みは、特に制限はないが、硬度の発現と硬化収縮、コストを考慮すると、2μm以上10μm以下の範囲内であることが好ましい。
(Hard coat layer 3)
The hard coat layer 3 is a layer that becomes the outermost surface layer of the molded product when the base film 1 is peeled off after transfer. The material of the hard coat layer 3 is made of a resin that is in a tack-free state before transfer to the transfer substrate, and can be cross-linked by, for example, irradiating with ultraviolet rays or electron beams after transfer to the transfer substrate. Is desirable. The reason for crosslinking after transfer is that if the hard coat layer 3 is crosslinked in advance, cracks are likely to occur during transfer stretching, resulting in poor appearance. On the other hand, if the tack-free state is not achieved before transfer, the blocking resistance and the heat resistance during injection molding are insufficient. In addition, for example, the reason for using a resin that can be crosslinked by irradiating with ultraviolet rays or electron beams is that the hard coat layer 3 using the resin can immediately irradiate with ultraviolet rays or electron beams to immediately turn the surface of the molded product. This is because the production efficiency of the molded product is improved.
The thickness of the hard coat layer 3 is not particularly limited, but is preferably in the range of 2 μm or more and 10 μm or less in consideration of hardness expression, curing shrinkage, and cost.
(加飾層4)
 マット調インモールド成形用転写フィルム100に絵柄を付与したい場合、ハードコート層3と接着層5との間に加飾層4を設けてもよい。加飾層4は、従来技術に係る加飾層と比較して、特に材料としての違いはない。また、本実施形態で採用可能な加飾技術としては、着色された塗布液による一般印刷は勿論のこと、例えば、パールや蛍光、ミラー、再帰反射、磁気印刷などの特殊印刷、熱や紫外線によって凹凸構造(各種レンズ効果やホログラム)を形成するエンボス加工、アルミニウムや銀、クロム、酸化チタン、硫化亜鉛などを真空蒸着やスパッタリングによって形成する薄膜形成技術を採用することが可能である。
 ハードコート層3と加飾層4との密着が困難である場合、例えば、ハードコート層3と加飾層4との間にプライマー層(図示せず)を設けてもよい。このプライマー層としては、ハードコート層3と加飾層4との密着を保つために適した樹脂を適宜使用することができる。
(Decoration layer 4)
When it is desired to give a pattern to the mat-like in-mold transfer film 100, the decorative layer 4 may be provided between the hard coat layer 3 and the adhesive layer 5. The decorative layer 4 is not particularly different as a material as compared with the decorative layer according to the prior art. In addition, as a decoration technique that can be adopted in the present embodiment, not only general printing with a colored coating solution, but also special printing such as pearl, fluorescence, mirror, retroreflection, and magnetic printing, heat and ultraviolet rays are used. It is possible to employ an embossing process for forming a concavo-convex structure (various lens effects and holograms) and a thin film forming technique for forming aluminum, silver, chromium, titanium oxide, zinc sulfide, etc. by vacuum deposition or sputtering.
When the adhesion between the hard coat layer 3 and the decorative layer 4 is difficult, for example, a primer layer (not shown) may be provided between the hard coat layer 3 and the decorative layer 4. As this primer layer, a resin suitable for maintaining the adhesion between the hard coat layer 3 and the decorative layer 4 can be appropriately used.
(接着層5)
 接着層5としては、例えば、公知のヒートシール性接着剤又は粘着剤を使用できる。より詳しくは、接着層5の材料としては、例えば、酢酸ビニル樹脂、エチレン酢酸ビニル共重合樹脂、塩酢ビ樹脂、アクリル樹脂、ブチラール樹脂、エポキシ樹脂、ポリエステル樹脂、ポリウレタン樹脂、アクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤などが挙げられる。また、接着層5の厚みは、0.5μm以上10μm以下の範囲内が最適である。
 本実施形態に係る各層の形成方法は、例えば、既存の塗布・印刷方法を採用することができる。より詳しくは、上記各層の形成方法としては、例えば、ダイレクトグラビア、グラビアリバース、マイクログラビア、ロールコート、カーテンコート、ダイコート、スプレーコート、マイヤーコート、コンマコート、スクリーン印刷、フレキソ印刷などが挙げられる。
(Adhesive layer 5)
As the adhesive layer 5, for example, a known heat-sealable adhesive or pressure-sensitive adhesive can be used. More specifically, examples of the material for the adhesive layer 5 include vinyl acetate resin, ethylene vinyl acetate copolymer resin, vinyl acetate resin, acrylic resin, butyral resin, epoxy resin, polyester resin, polyurethane resin, acrylic pressure-sensitive adhesive, Examples thereof include a rubber-based adhesive, a silicone-based adhesive, and a urethane-based adhesive. The thickness of the adhesive layer 5 is optimally in the range of 0.5 μm to 10 μm.
As a method for forming each layer according to the present embodiment, for example, an existing coating / printing method can be employed. More specifically, examples of the method for forming each layer include direct gravure, gravure reverse, micro gravure, roll coating, curtain coating, die coating, spray coating, Mayer coating, comma coating, screen printing, flexographic printing, and the like.
(凹凸形成層6)
 凹凸形成層6は、例えば、グラビア印刷法やスクリーン印刷法によって、凹凸パターンを印刷することで形成された層である。凹凸形成層6の材料としては、転写時に受ける熱や圧力に耐えることのできる熱硬化性樹脂や紫外線硬化性樹脂を用いることができる。
 また、熱硬化性樹脂や紫外線硬化性樹脂を含む凹凸形成層6は、上記グラビア印刷法以外の方法、例えば、グラビアコート法、ロールコート法、ナイフコート法、シルクスクリーン印刷法、その他通常のコート法ないし印刷法で塗布した後、上述の熱硬化性樹脂や紫外線硬化性樹脂をエンボス加工することによって形成しても良い。
(Unevenness forming layer 6)
The concavo-convex formation layer 6 is a layer formed by printing a concavo-convex pattern by, for example, a gravure printing method or a screen printing method. As the material of the unevenness forming layer 6, a thermosetting resin or an ultraviolet curable resin that can withstand heat and pressure received during transfer can be used.
Moreover, the uneven | corrugated formation layer 6 containing a thermosetting resin or an ultraviolet curable resin is methods other than the said gravure printing method, for example, gravure coating method, roll coating method, knife coating method, silk screen printing method, and other normal coatings It may be formed by embossing the above-mentioned thermosetting resin or ultraviolet curable resin after coating by a method or a printing method.
<転写方法>
 以下、本実施形態に係るインモールド成形用転写フィルムを用いた転写方法について、説明する。図2は、本実施形態に係るインモールド成形用転写フィルムを用いて射出成形する様子の示す断面概略図である。
 まず、マット調インモールド成形用転写フィルム100を準備する。このマット調インモールド成形用転写フィルム100を用いれば、凹凸パターンのない射出成形用金型8を使用した場合であっても、インモールド成形を行うことにより、表面に凹凸のあるマット調の成形品を製造することができる。このため、凹凸パターンを有する射出成形用金型を使用してインモールド成形を行って成形品表面に凹凸を形成する場合と比べて、パターン毎に必要となる金型作製のコストや、金型の交換にかかる手間を削減できて経済的である。
 インモールド成形は、マット調インモールド成形用転写フィルム100を、キャビティを構成する一対の射出成形用金型8内へ挿入し、マット調インモールド成形用転写フィルム100の接着層5側から射出成形用金型8のキャビティ内へ成形樹脂7を射出成形する。こうすることで、成形樹脂7の表面にマット調インモールド成形用転写フィルム100を転写する。この射出成形の際、マット調インモールド成形用転写フィルム100には圧力がかかるので、凹凸形成層6の凹凸パターンに沿って成形樹脂7に凹凸が形成される。
<Transfer method>
Hereinafter, a transfer method using the in-mold transfer film according to this embodiment will be described. FIG. 2 is a schematic cross-sectional view showing a state of injection molding using the in-mold transfer film according to the present embodiment.
First, a matte in-mold transfer film 100 is prepared. If this mat-like in-mold transfer film 100 is used, even if an injection mold 8 without an uneven pattern is used, by performing in-mold forming, a mat-like forming with uneven surfaces is performed. Product can be manufactured. For this reason, compared with the case of forming indentations on the surface of a molded product by performing in-mold molding using an injection mold having an uneven pattern, the cost of mold production required for each pattern, and the mold It is economical because it can reduce the time and effort required for replacement.
In-mold molding is performed by inserting the mat-like in-mold molding transfer film 100 into a pair of injection-molding molds 8 constituting the cavity, and injection molding from the adhesive layer 5 side of the mat-like in-mold molding transfer film 100. The molding resin 7 is injection molded into the cavity of the mold 8 for use. By doing so, the mat-like in-mold transfer film 100 is transferred onto the surface of the molding resin 7. During this injection molding, pressure is applied to the mat-like in-mold molding transfer film 100, so that irregularities are formed in the molding resin 7 along the irregular pattern of the irregularity forming layer 6.
 図3は、本実施形態に係るインモールド成形用転写フィルムを転写した成形品の構造を示す断面概略図である。
 インモールドで射出成形及び射出成形用金型8内で転写が完了した後、射出成形用金型8を開放する。その後、マット調インモールド成形用転写フィルム100のベースフィルム1及び離型層2を剥離して、成形品200を取り出す。こうして、所望の凹凸パターンや表面のマット光沢を有する成形品200を得ることができる。
 このようにして、本実施形態に係るインモールド成形用転写フィルム100を用いて製造した成形品200は、例えば、日用品や生活用品などの機器本体、食品や各種物品の容器類、電子機器や事務用品などの筐体類などに用いられる。
FIG. 3 is a schematic cross-sectional view showing the structure of a molded product to which the transfer film for in-mold molding according to this embodiment is transferred.
After the in-mold injection and the transfer in the injection mold 8 are completed, the injection mold 8 is opened. Thereafter, the base film 1 and the release layer 2 of the mat-like in-mold transfer film 100 are peeled off, and the molded product 200 is taken out. In this way, a molded product 200 having a desired uneven pattern and surface mat gloss can be obtained.
In this way, the molded product 200 manufactured using the in-mold molding transfer film 100 according to the present embodiment includes, for example, equipment bodies such as daily necessities and daily necessities, containers for food and various articles, electronic equipment and office work. Used for housings such as supplies.
 以下、本発明を実施例により詳細に説明するが、本発明は以下の実施例のみに限定されるものではない。
 <実施例1>
 厚さ50μmの二軸延伸ポリエステルフィルム(三菱樹脂社製:G440E50)をベースフィルムとして、その一方の面に、下記組成の離型層用塗布液をマイクログラビア法を用いて、乾燥後の膜厚が0.2μmとなるように塗布、乾燥した。その後、50℃で5日間エージングして、実施例1に係る離型層を備えた離型フィルムを作製した。
EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited only to a following example.
<Example 1>
Using a biaxially stretched polyester film (Mitsubishi Resin Co., Ltd .: G440E50) having a thickness of 50 μm as a base film, a coating liquid for a release layer having the following composition is applied to one side of the film using a microgravure method. Was applied and dried to a thickness of 0.2 μm. Thereafter, the film was aged at 50 ° C. for 5 days to produce a release film provided with the release layer according to Example 1.
(離型層用塗布液の組成)
・アクリルポリオール樹脂(東栄化成社製LC#6560):100重量部
・ニトロセルロース(H1/4):10重量部
・アクリルシリコン樹脂:5重量部
・イソシアネート化合物(日本ポリウレタン社製コロネートL):20重量部
・シリカ(粒径2μm):4重量部
 次に、上記離型フィルムに備わる離型層の上に、下記組成のハードコート層用塗布液をマイクログラビア法にて、乾燥後の膜厚が4.0μmになるように塗布、乾燥した。こうして、実施例1に係るハードコート層を形成した。
(Composition of release layer coating solution)
-Acrylic polyol resin (LC # 6560 manufactured by Toei Kasei Co., Ltd.): 100 parts by weight-Nitrocellulose (H1 / 4): 10 parts by weight-Acrylic silicone resin: 5 parts by weight-Isocyanate compound (Coronate L manufactured by Nippon Polyurethane): 20 Part by weight / Silica (particle size: 2 μm): 4 parts by weight Next, on the release layer provided in the release film, a coating film for hard coat layer having the following composition is dried by a microgravure method. Was applied and dried so as to be 4.0 μm. Thus, the hard coat layer according to Example 1 was formed.
(ハードコート層用塗布液の組成)
・紫外線硬化性樹脂(DIC社製RC29-117:紫外線重合開始剤入り、固形分30%):100重量部
・シリカ(日産化学社製:粒径10~20nm、MEK分散液、固形分30%):20重量部
 次に、上記ハードコート層の上に、接着層としてアクリルポリオール/イソシアネート系塗布液(東洋インキ社製:V425アンカー)を、グラビア法を用いて乾燥後の膜厚が2μmになるように塗布した。
(Composition of coating solution for hard coat layer)
UV curable resin (RC29-117 manufactured by DIC: containing UV polymerization initiator, solid content 30%): 100 parts by weight Silica (Nissan Chemical Co., Ltd .: particle size 10-20 nm, MEK dispersion, solid content 30% ): 20 parts by weight Next, on the hard coat layer, an acrylic polyol / isocyanate-based coating liquid (manufactured by Toyo Ink Co., Ltd .: V425 anchor) is used as the adhesive layer, and the film thickness after drying is 2 μm using the gravure method. It applied so that it might become.
 次に、ベースフィルムの離型層とは反対側の面に、グラビア印刷法にて熱硬化性のウレタン系樹脂を含んだ塗布液を塗布した。その後、50℃雰囲気下で6日間放置することにより、塗布したウレタン系樹脂を硬化させて、実施例1に係る凹凸形成層を形成した。こうして、実施例1に係るマット調インモールド成形用転写フィルムを作製した。
 上記で得られたマット調インモールド成形用転写フィルムを射出成形用金型に固定し、型締めしてPC(ポリカーボネート)/ABS(アクリロニトリルブタジエンスチレン)樹脂を射出成形した。この射出成形された樹脂を冷却した後、射出成形用金型を開放し、インモールド成形用転写フィルムのベースフィルムを離型層とともに成形品から剥離した。その後、成形品表面に高圧水銀灯を用いて、積算光量1000mJ/cmの紫外線を照射し、ハードコート層を架橋硬化させた。こうして、実施例1に係る表面に凹凸を有するマット調の成形品を得た。
Next, a coating liquid containing a thermosetting urethane resin was applied to the surface of the base film opposite to the release layer by a gravure printing method. Thereafter, the applied urethane-based resin was cured by leaving it in a 50 ° C. atmosphere for 6 days to form an unevenness forming layer according to Example 1. Thus, a mat-like in-mold transfer film according to Example 1 was produced.
The mat-like in-mold transfer film obtained above was fixed to an injection mold, and clamped to injection-mold a PC (polycarbonate) / ABS (acrylonitrile butadiene styrene) resin. After the injection molded resin was cooled, the injection mold was opened, and the base film of the in-mold transfer film was peeled from the molded product together with the release layer. Thereafter, the surface of the molded product was irradiated with ultraviolet rays having an integrated light quantity of 1000 mJ / cm 2 using a high-pressure mercury lamp, and the hard coat layer was crosslinked and cured. Thus, a mat-like molded product having irregularities on the surface according to Example 1 was obtained.
 <比較例1>
 比較例1では、実施例1と同様のベースフィルムを用いた。このベースフィルムの一方の面に、実施例1の離型層用塗布液に含まれるアクリルポリオール樹脂の代わりにメラミン系樹脂を含んだ離型層用塗布液を、マイクログラビア法にて、乾燥後の膜厚が0.2μmになるように塗布した。その後、180℃で焼き付けして、比較例1に係る離型層を備えた離型フィルムを作製した。なお、これ以外は、実施例1と同様の構成となるように各層を積層した。こうして、比較例1に係るインモールド成形用転写フィルムを作製した。
 次に、この比較例1に係るインモールド成形用転写フィルムを用いて、実施例1と同様にして射出成形を行い、比較例1に係る成形品を得た。
<Comparative Example 1>
In Comparative Example 1, the same base film as in Example 1 was used. On one surface of this base film, a release layer coating solution containing a melamine resin instead of the acrylic polyol resin contained in the release layer coating solution of Example 1 is dried by a microgravure method. The film was applied so that the film thickness was 0.2 μm. Then, it baked at 180 degreeC and produced the release film provided with the release layer which concerns on the comparative example 1. Other than this, each layer was laminated so as to have the same configuration as in Example 1. Thus, an in-mold transfer film according to Comparative Example 1 was produced.
Next, injection molding was performed in the same manner as in Example 1 using the in-mold transfer film according to Comparative Example 1, and a molded product according to Comparative Example 1 was obtained.
 <評価及び方法>
 実施例1及び比較例1で作製したマット調インモールド成形用転写フィルムについて、それぞれのマット調インモールド成形用転写フィルムによる被転写基材(具体的には、ノートパソコン筐体)への転写性を目視にて評価した。外観異常がない場合(実用上問題のないレベル)を○、外観異常がある場合(実用上問題がある)を×とした。その結果を表1に示す。
<Evaluation and method>
About the transfer film for mat-like in-mold molding produced in Example 1 and Comparative Example 1, transferability to each substrate to be transferred (specifically, a notebook personal computer casing) by the transfer film for mat-like in-mold molding Was visually evaluated. The case where there was no appearance abnormality (a level where there was no problem in practical use) was marked as ◯, and the case where there was an appearance abnormality (problem in practice) was marked as x. The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
 <比較結果>
 実施例1で得られた成形品は、凹凸パターンにもクラックが発生せず、良好な外観の仕上がりで得ることができた。一方、比較例1では、成形品表面の凹凸パターンにクラックが発生し、良好な外観の成形品を得ることができなかった。
<Comparison result>
The molded product obtained in Example 1 was not cracked in the concavo-convex pattern, and could be obtained with a good appearance. On the other hand, in Comparative Example 1, a crack was generated in the uneven pattern on the surface of the molded product, and a molded product having a good appearance could not be obtained.
(効果)
(1)本実施形態に係るインモールド成形用転写フィルム100は、離型層2がシリコーン変性アクリルウレタン樹脂で形成されているので、熱転写時に優れた離型性を呈し、且つ、優れた延伸性を呈する。
 このため、凹凸パターンを有し、且つマット調の仕上がり光沢を備える成形品200の表面において、ハードコート層3にクラックが発生するのを防止することができる。
(2)また、ベースフィルム1の離型層2とは反対側の面に凹凸形成層6を設けているので、転写時に、凹凸形成層6を構成する樹脂の厚みにより、その凹凸パターンに沿った凹凸を成形品200の表面に形成することができる。
 このため、多様な凹凸パターンに対応する場合に、多数の射出成形用金型8を用意する必要がなく、金型作製のコストを削減することができる。また、従来の凹凸パターンのない射出成形用金型8を使用して、成形品表面に凹凸パターンを形成することができるため、金型の交換にかかるコストを削減できて経済的である。さらに、インモールド成形用転写フィルム100の絵柄と凹凸パターンとを対応させることも容易となる。
(effect)
(1) In the in-mold transfer film 100 according to this embodiment, since the release layer 2 is formed of a silicone-modified acrylic urethane resin, it exhibits excellent releasability during thermal transfer and excellent stretchability. Presents.
For this reason, it is possible to prevent the hard coat layer 3 from being cracked on the surface of the molded product 200 having an uneven pattern and having a matte finish gloss.
(2) Moreover, since the uneven | corrugated formation layer 6 is provided in the surface on the opposite side to the mold release layer 2 of the base film 1, it follows the uneven | corrugated pattern by the thickness of resin which comprises the uneven | corrugated formation layer 6 at the time of transcription | transfer. Irregularities can be formed on the surface of the molded product 200.
For this reason, when dealing with various uneven patterns, it is not necessary to prepare a large number of injection molds 8, and the cost of mold fabrication can be reduced. Moreover, since the uneven | corrugated pattern can be formed in the molded article surface using the injection mold 8 without the conventional uneven | corrugated pattern, the cost concerning replacement | exchange of a metal mold | die can be reduced and it is economical. Furthermore, it becomes easy to make the pattern of the transfer film 100 for in-mold molding correspond to the concavo-convex pattern.
(3)また、離型層2は、少なくともアクリルポリオール樹脂と、水酸基を含有するアクリルシリコン樹脂と、イソシアネート化合物との架橋反応から生成されたアクリルウレタン樹脂を含んでいるので、室温~50℃程度の低温で硬化反応が終了する。
 このため、ベースフィルム1への熱負荷の少ない離型層2を作製することができる。
(4)また、離型層2はセルロース誘導体を含んでいるので、射出成形と同時に転写するインモールド転写、すなわち高温での耐熱性が要求されるインモールド転写の場合でも耐熱性が向上し、熱シワやブロッキングを抑制することができる。
(5)また、離型層2は水酸基及び炭素数10以上30以下の長鎖アルキル基を有するアクリル樹脂を含んでいるので、離型層2の離型性と延伸性とを向上させることができる。さらに、離型層2を形成するための離型層用塗布液の塗布時におけるレベリング性が向上するため、均一な離型層を形成することができる。
(3) Since the release layer 2 contains at least an acrylic polyol resin, an acrylic silicon resin containing a hydroxyl group, and an acrylic urethane resin generated from a crosslinking reaction with an isocyanate compound, the room temperature to about 50 ° C. The curing reaction is completed at a low temperature.
For this reason, the mold release layer 2 with little heat load to the base film 1 can be produced.
(4) Moreover, since the release layer 2 contains a cellulose derivative, the heat resistance is improved even in the case of in-mold transfer that is transferred simultaneously with injection molding, that is, in-mold transfer that requires heat resistance at high temperatures, Thermal wrinkles and blocking can be suppressed.
(5) Moreover, since the release layer 2 contains an acrylic resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms, the release property and stretchability of the release layer 2 can be improved. it can. Furthermore, since the leveling property at the time of application | coating of the coating liquid for mold release layers for forming the mold release layer 2 improves, a uniform mold release layer can be formed.
(その他の効果)
 従来のインモールド成形用転写フィルムは、文字や絵柄等をベースフィルム上に平面的に印刷しただけの構造であるため、成形品表面の立体感が乏しいという課題があった。
 この点に関し、本実施形態に係るインモールド成形用転写フィルム100であれば、成形時にキャビティを構成する一対の射出成形用金型8の内側のベースフィルム1が対接する側に予め凹凸を設けてあるので、成形品表面に凹凸を形成することができる。よって、上記課題を解決することができる。
 以上で、特定の実施形態を参照して本発明を説明したが、これら説明によって発明を限定することを意図するものではない。本発明の説明を参照することにより、当業者には、開示された実施形態の種々の変形例とともに本発明の別の実施形態も明らかである。従って、特許請求の範囲は、本発明の範囲及び要旨に含まれるこれらの変形例または実施形態も網羅すると解すべきである。
(Other effects)
Since the conventional transfer film for in-mold molding has a structure in which characters, pictures, and the like are simply printed on a base film in a flat manner, there is a problem that the three-dimensional effect on the surface of the molded product is poor.
In this regard, in the case of the in-mold molding transfer film 100 according to the present embodiment, an unevenness is provided in advance on the side where the base film 1 inside the pair of injection molds 8 constituting the cavity at the time of molding is in contact. As a result, irregularities can be formed on the surface of the molded product. Therefore, the above problem can be solved.
Although the present invention has been described above with reference to specific embodiments, it is not intended that the present invention be limited by these descriptions. From the description of the invention, other embodiments of the invention will be apparent to persons skilled in the art, along with various variations of the disclosed embodiments. Therefore, it is to be understood that the claims encompass these modifications and embodiments that fall within the scope and spirit of the present invention.
1…ベースフィルム
2…離型層
3…ハードコート層
4…加飾層
5…接着層
6…凹凸形成層
7…成形樹脂
8…射出成形用金型
100…マット調インモールド成形用転写フィルム
200…成形品
DESCRIPTION OF SYMBOLS 1 ... Base film 2 ... Release layer 3 ... Hard-coat layer 4 ... Decorating layer 5 ... Adhesion layer 6 ... Concave-forming layer 7 ... Molding resin 8 ... Mold 100 for injection molding ... Transfer film 200 for mat-like in-mold molding …Molding

Claims (7)

  1.  ベースフィルムの一方の面に、少なくとも離型層と、ハードコート層と、接着層と、をこの順で積層したインモールド成形用転写フィルムであって、
     前記離型層は、フィラーを含み、且つシリコーン変性アクリルウレタン樹脂で形成され、
     前記ベースフィルムの前記離型層とは反対側の面に、凹凸形成層を設けたことを特徴とするインモールド成形用転写フィルム。
    An in-mold transfer film in which at least a release layer, a hard coat layer, and an adhesive layer are laminated in this order on one surface of a base film,
    The release layer includes a filler and is formed of a silicone-modified acrylic urethane resin.
    An in-mold transfer film, wherein an unevenness forming layer is provided on a surface of the base film opposite to the release layer.
  2.  前記シリコーン変性アクリルウレタン樹脂は、少なくともアクリルポリオール樹脂と、水酸基を含有するアクリルシリコン樹脂と、イソシアネート化合物との架橋反応から生成されることを特徴とする請求項1に記載のインモールド成形用転写フィルム。 The transfer film for in-mold molding according to claim 1, wherein the silicone-modified acrylic urethane resin is produced from a crosslinking reaction of at least an acrylic polyol resin, an acrylic silicon resin containing a hydroxyl group, and an isocyanate compound. .
  3.  前記離型層は、水酸基を有するセルロース誘導体を含むことを特徴とする請求項1または請求項2に記載のインモールド成形用転写フィルム。 The transfer film for in-mold molding according to claim 1 or 2, wherein the release layer contains a cellulose derivative having a hydroxyl group.
  4.  前記離型層は、水酸基及び炭素数10以上30以下の長鎖アルキル基を有するアクリル樹脂を含むことを特徴とする請求項1から請求項3のいずれか1項に記載のインモールド成形用転写フィルム。 The in-mold molding transfer according to any one of claims 1 to 3, wherein the release layer includes an acrylic resin having a hydroxyl group and a long-chain alkyl group having 10 to 30 carbon atoms. the film.
  5.  前記ハードコート層と前記接着層との間に、加飾層を設けたことを特徴とする請求項1から請求項4のいずれか1項に記載のインモールド成形用転写フィルム。 The transfer film for in-mold molding according to any one of claims 1 to 4, wherein a decoration layer is provided between the hard coat layer and the adhesive layer.
  6.  前記ハードコート層と前記加飾層との間に、プライマー層を設けたことを特徴とする請求項5に記載のインモールド成形用転写フィルム。 The transfer film for in-mold molding according to claim 5, wherein a primer layer is provided between the hard coat layer and the decorative layer.
  7.  請求項1から請求項6のいずれか1項に記載のインモールド成形用転写フィルムを用いて製造されたことを特徴とする成形品。 A molded product produced using the in-mold molding transfer film according to any one of claims 1 to 6.
PCT/JP2014/005605 2013-11-18 2014-11-07 Transfer film for in-mold molding and molded article using same WO2015072119A1 (en)

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JP6906981B2 (en) * 2017-03-01 2021-07-21 大日本印刷株式会社 Manufacturing method of transfer sheet for three-dimensional molding and decorative resin molded product
JP7260474B2 (en) * 2018-08-09 2023-04-18 東レフィルム加工株式会社 release film
WO2020203659A1 (en) * 2019-03-29 2020-10-08 大日本印刷株式会社 Transfer sheet and method of manufacturing decorative molded product
WO2022071441A1 (en) * 2020-09-29 2022-04-07 大日本印刷株式会社 Transfer sheet and method for producing resin molded article using same

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JP2013199001A (en) * 2012-03-23 2013-10-03 Toppan Printing Co Ltd In-mold transfer foil, decorative molded article, and method of manufacturing decorative molded article
JP2015016659A (en) * 2013-07-12 2015-01-29 凸版印刷株式会社 Matte tone transfer film and molded article using the same

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WO2011065252A1 (en) * 2009-11-30 2011-06-03 電気化学工業株式会社 Adhesive sheet and electronic component

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JP2013199001A (en) * 2012-03-23 2013-10-03 Toppan Printing Co Ltd In-mold transfer foil, decorative molded article, and method of manufacturing decorative molded article
JP2015016659A (en) * 2013-07-12 2015-01-29 凸版印刷株式会社 Matte tone transfer film and molded article using the same

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