JP2006299115A - Tacky film for non-slip use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tacky film for non-slip use suitable for edging which is used for the edging with no axial displacement of a lens having a stain-proof layer formed of a fluorine-containing silane compound excellent in the stain-proof effect. <P>SOLUTION: The tacky film 1 for non-slip use is a tacky film for pasting a workpiece 2, and is such that such a tacky layer of the tacky film as is in contact with the workpiece 2 comprises a pressure-sensitive adhesive composition containing a polymer having the chief component of a (meth)acrylate, a tackifying resin and a crosslinker. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an anti-slip adhesive film, and more particularly to an anti-slip adhesive film suitable for processing a lens of a spectacle lens having a surface subjected to antifouling treatment.

Lenses such as eyeglass lenses usually have an anti-reflective coating on the surface to suppress light reflection and increase light transmission, but they can be used for dirt, fingerprints, sweat, cosmetics. There is a problem that the adhesion of the ink is conspicuous and the dirt is difficult to remove. Therefore, in order to make it hard to get dirty or to wipe off dirt, an antifouling layer is further provided on the surface of the antireflection film.
A surface treatment agent for providing an antifouling layer on spectacle lenses has already been reported, but spectacle lenses formed with an antifouling layer by surface treatment with a fluorine-containing silane compound have good antifouling properties, and The effect is persistent (see, for example, Patent Document 1).

  In a spectacles retailer, so-called lens processing is performed in which a circular spectacle lens is ground into a shape that fits into a spectacle frame. This lens shape processing is performed by using a stabbing processing machine and holding the processing center of the spectacle lens by suction on the chuck part of the machine or by pressing the processing center of the spectacle lens from both sides of the lens and sandwiching it. The edge of the spectacle lens is ground with a grindstone while the spectacle lens is held by the generated frictional force.

However, since the lens surface-treated with the fluorine-containing silane compound described in the above publication has a remarkably small friction coefficient compared to conventional surface treatment agents and the surface is slippery, when grinding the lens with a grindstone, There is a problem that the lens slips with respect to the chuck due to the polishing pressure, so-called axial misalignment occurs, and accurate lens processing cannot be performed.
In order to cope with this problem, Patent Document 2 proposes a method of laminating an adhesive film on a lens surface and then chucking and processing a lens, but regarding a lens having a high antifouling performance and so-called slipperiness. It was not always possible to obtain sufficient performance. In addition, using a film coated with a silicone adhesive that has a relatively high adhesion to a lens surface-treated with a fluorinated silane compound does not lead to sufficient performance but is expensive. It was a situation that would become.
Japanese Patent Laid-Open No. 9-258003 JP 2004-249454 A

The present invention has been considered in view of such a situation, and in particular, for the lens processing used for processing a lens having an antifouling layer made of a fluorine-containing silane compound having an excellent antifouling effect without any misalignment. An object is to provide a suitable anti-slip adhesive film.
As a result of intensive studies on the above-mentioned problems, the present inventor added a tackifying resin to a polymer having a high cohesive force, in particular, adding a tackifying resin so as to cause cloudiness in the adhesive layer, Preferably, for a lens subjected to antifouling treatment, a tackifying resin that is compatible with a polymer up to a certain amount and does not cause white turbidity is added to an extent that white turbidity is observed in the adhesive layer. As a result, it was found that the shaft misalignment prevention performance was greatly improved, and that the properties such as stability and storage stability of the material itself were not affected, and the present invention was completed.

    The anti-slip adhesive film of the present invention for solving the above-described problem is an adhesive film to be bonded to a workpiece, and the adhesive layer in contact with the workpiece of the adhesive film is mainly composed of (meth) acrylic acid ester. It comprises a pressure-sensitive adhesive composition containing a polymer as a component, a tackifier resin, and a crosslinking agent.

    The anti-slip adhesive film according to claim 2 is the anti-slip adhesive film according to claim 1, wherein the tackifier resin is a terpene resin, α-pinene, terpene phenol copolymer, rosin and rosin derivative, coumarone- It consists of one kind or a mixture of several kinds of indene resin, hydrocarbon resin, alkylphenol resin, xylene resin and aromatic petroleum resin.

   Further, the anti-slip adhesive film according to claim 3 is an anti-slip adhesive film according to claim 1 or 2, wherein the non-slip adhesive film is not compatible with a polymer based on a (meth) acrylic acid ester as a main component. Due to the addition of the resin, the internal HAZE of the adhesive layer having a thickness of 20 μm is 1 or more.

   Further, the anti-slip adhesive film according to claim 4 is the anti-slip adhesive film according to claim 1 or 2, wherein at least 3 parts by weight with respect to 100 parts by weight of the polymer having (meth) acrylic acid ester as a main component. Up to this point, it is a tackifying resin that is compatible with the polymer, and this tackifying resin is added in such a quantity that the internal HAZE of the adhesive layer having a thickness of 20 μm is 1 or more.

  Further, the anti-slip adhesive film according to claim 5 is an adhesive film to be bonded to a workpiece, and the adhesive layer of the adhesive film in contact with the workpiece is natural rubber or synthetic rubber, silicone rubber, urethane resin. And a pressure-sensitive adhesive composition containing a tackifier resin and a crosslinking agent.

   The anti-slip adhesive film according to claim 6 is the anti-slip adhesive film according to claim 5, wherein the tackifying resin is added so as to be incompatible with the polymer.

  By using the anti-slip adhesive film according to the present invention, for example, a highly antifouling spectacle lens surface-treated with a fluorine-containing silane compound can be obtained in a simple and safe manner. It is possible to carry out target lens processing at a retail store, and it is possible to prevent the occurrence of defective processing by preventing the displacement of the suction jig during processing, which has been a conventional problem.

Hereinafter, an anti-slip adhesive film (for example, an anti-slip adhesive film used for lens processing of a lens) according to an embodiment of the present invention will be described in detail.
The pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer contains a polymer mainly composed of (meth) acrylic acid ester, a tackifier resin, and a crosslinking agent. Alternatively, it contains a polymer made of natural rubber or synthetic rubber, silicone rubber or urethane resin, a tackifier resin, and a crosslinking agent. The polymer mainly composed of (meth) acrylate used in the present invention is a polymer obtained by polymerizing a monomer mixture mainly composed of (meth) acrylate by a conventionally known polymerization method. is there. As the monomer mixture, a (meth) acrylic acid ester as a main component and a functional group-containing monomer having a functional group that undergoes a crosslinking reaction with a crosslinking agent as an essential component. Other vinyl monomers can also be blended.

Examples of (meth) acrylic acid ester used as the main component include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, 2 Examples include ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, iso-octyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxymethyl (meth) acrylate, and the like. be able to. These can be used alone or in combination.
Examples of functional group-containing monomers include monomers having a carboxyl group such as (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, maleic anhydride, β-carboxyethyl acrylate, 2-hydroxyethyl ( Hydroxyl group-containing monomers such as meth) acrylate, 4-hydroxybutyl (meth) acrylate, diethylene glycol mono (meth) acrylate, epoxy group-containing monomers such as glycidyl (meth) acrylate, aminomethyl (meth) acrylate, dimethylaminoethyl (meth) ) Monomers having an amino group such as acrylate, and amide group-containing monomers such as acrylamide and methylol (meth) acrylamide. These can be used alone or in combination. Further, as other monomers, aromatic vinyl monomers such as styrene, methylstyrene and vinyltoluene, vinyl acetate, vinyl chloride, (meth) acrylonitrile and the like may be copolymerized singly or in combination.

  The rubber adhesive used in the present invention includes natural rubber, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene / butylene-styrene block copolymer, styrene butadiene. Rubber, polybutadiene, polyisoprene, polyisobutylene, butyl rubber, chloroprene rubber, silicone rubber, and urethane resin can be used alone or in combination.

  Further, as a tackifying resin to be added to a polymer having (meth) acrylic acid ester as a main component, terpene resin, α-pinene, terpene phenol copolymer, rosin and rosin derivative, coumarone-indene resin, hydrocarbon resin, alkylphenol Examples thereof include resins, xylene resins, aromatic petroleum resins, and the like, and one or a mixture of these can be used. Furthermore, an acrylic resin can also be used. Further, as the tackifying resin to be added to natural rubber or synthetic rubber, silicone rubber, and urethane resin, aliphatic petroleum resin, alicyclic petroleum resin, and the like can be added in addition to those described above.

  Examples of the crosslinking agent include isocyanate compounds, epoxy compounds, aziridine compounds, metal chelate compounds, and amine compounds. These crosslinking agents can be used alone or in combination of two or more. The addition amount of this crosslinking agent needs to be carefully examined. That is, when the addition amount is insufficient, the cohesive force is insufficient, and when the addition amount is too large, elasticity is insufficient, and sufficient physical properties cannot be obtained in any case.

  Moreover, it is necessary to consider the kind and addition amount of tackifying resin with respect to each polymer sufficiently carefully. Addition of tackifying resin so as to be compatible with the polymer, a certain degree of misalignment prevention effect is recognized, but preferably adding a tackifying resin that is not compatible with the polymer having sufficient cohesive force, More preferably, up to 3 parts by weight with respect to 100 parts by weight of the polymer, a tackifying resin that is compatible with the polymer and does not cause white turbidity in the adhesive layer, By adding a slight excess so that the internal HAZE of the adhesive layer having a thickness of 20 μm is 1 or more, it is possible to significantly improve the axial displacement prevention performance for the lens subjected to the antifouling treatment. In the case of the designed one, a decrease in the adhesive force is observed due to the excessive addition of the tackifying resin, but the effect of preventing misalignment is tremendous and does not cause a decrease in the cohesive force generally called. Furthermore, the properties of the material itself, such as stability and storage stability, are not affected. However, adding an excessive amount of tackifying resin more than necessary may cause an extreme decrease in adhesive strength, impairing the workability of bonding, and may adversely affect the stability and storage stability of the material itself. So be careful.

The base film is not particularly limited, and is a general plastic film such as a polyester film, a polypropylene film, a polyethylene film, a polycarbonate film, a polyurethane film, a soft polyvinyl chloride film, a synthetic rubber film, and a foam film. Can be used. These films may be non-stretched films or stretched films. Further, paper, coated paper, laminated paper, synthetic paper, and the like can be used.
Since the lens surface to be bonded is a curved surface, the material and thickness that follow the curved surface are preferable, and the preferable thickness is 20 to 500 μm, more preferably 25 to 200 μm, but it varies depending on the material of the base film. . In addition, care should be taken because a material and thickness that easily stretches more than necessary may cause axial misalignment. In addition, in order to raise the adhesive force with an adhesive and the adhesive force with a mechanical chuck | zipper part, various easy-adhesion processes including a corona treatment can also be given to the base film surface.
If necessary, the release film can be laminated so that the release surface of the release film is aligned with the adhesive layer. This release film can also serve as a carrier film when punching the adhesive film. As such a release film, a film having a release property to an adhesive layer such as polyethylene is used, and a film having a release agent such as a silicone type or a fluorine type applied to the film or a film having a release property is pasted. A combination of these can also be used. In consideration of the influence on the pressure-sensitive adhesive layer to be combined, those having a smooth surface are preferable, and those having no release component transfer to the pressure-sensitive adhesive layer surface are preferable. The migration of the mold release component has an undesirable effect on the physical properties. Further, when punching is performed also as a carrier film, a certain degree of thickness and strength is required as a film in order to avoid breakage at the time of half cut.

The pressure-sensitive adhesive layer can be formed by diluting an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive with an organic solvent, and applying and drying the substrate. An emulsion type can also be used. Furthermore, after applying a pressure-sensitive adhesive to the release surface of the film subjected to the mold release treatment, a method of transferring the pressure-sensitive adhesive by bonding the base film can be employed.
The coating method is not particularly limited, and known methods such as gravure coating, wire bar coating, roll coating, air knife coating, reverse coating, and kiss coating can be used.
The thickness of the adhesive layer is 1 μm to 100 μm, preferably 3 μm to 50 μm. If it is too thin, sufficient performance cannot be obtained, and if it is too thick, it is not only uneconomical but also causes cohesive failure. The anti-slip adhesive film according to the present invention is not limited to the processing of eyeglass lenses, but can be widely used for preventing slipping during processing.

Hereinafter, the present invention will be described with reference to examples and comparative examples. However, the present invention is not limited to the following examples.
The anti-slip adhesive film 1 is affixed to a workpiece 2 (for example, a lens surface for anti-slip at the time of lens shaping). More specifically, as shown in FIG. This is used when a spectacle lens original plate is shaved with a machine to form a spectacle frame, and the spectacle lens 2 is held by chucks 3 and 3 coming out from both sides of the machine, and the peripheral end of the spectacle lens 2 is used. It cuts and processes. In particular, when the surface of the spectacle lens 2 is anti-stained, the friction coefficient is extremely small, and if it is left as it is, it is slippery and cannot be accurately processed. The adhesive films 1 and 1 can be attached to the spectacle lens 2 and processed.
Example 1

Strong adhesive type acrylic pressure-sensitive adhesive SZ-2647 (manufactured by Nippon Carbide Industries Co., Ltd.) as a solid content, 100 parts by weight; Kogyo Co., Ltd.) was mixed at a ratio of 3 parts by weight as a solid content, and diluted with toluene until the solid content became 20% to obtain a coating solution. The adhesive layer was coated on the release surface of a 50 μm-thick biaxially stretched polyester film with a silicone release treatment on one side so that the solid content was 22 g / m ² and dried at 100 ° C. for 3 minutes. Formed.
Furthermore, the adhesive film of the polyethylene film base material is formed on the release film by bonding the corona-treated surface of a 100 μm thick polyethylene film O type (manufactured by Okura Kogyo Co., Ltd.) to the adhesive layer and performing aging at room temperature for 7 days. An anti-slip adhesive film having a laminated structure was obtained.
(Example 2)

Acrylic adhesive SZ-2647 as 100% by weight as a solid content, KE311 (made by Arakawa Chemical Co., Ltd.) as a tackifier resin at 7 parts by weight, and Coronate L45 as a solid content at a rate of 3 parts by weight, The solution was diluted to a solid content of 20% to obtain a coating solution. Using this coating solution, the same operation as in Example 1 was performed to obtain an anti-slip adhesive film having a structure in which a polyethylene film-based adhesive film was laminated on a release film.
(Example 3)

Acrylic pressure-sensitive adhesive SZ-2647 is blended at a solid content of 100 parts by weight, as a tackifier resin, YS polystar T145 is blended at a ratio of 20 parts by weight, and coronate L45 as a solid content at a ratio of 3 parts by weight. The solution was diluted to obtain a coating solution. Using this coating solution, the same processing as in Example 1 was performed to obtain an anti-slip adhesive film having a structure in which a polyethylene film-based adhesive film was laminated on a release film.
Example 4

100 parts by weight of rubber adhesive G6150 (manufactured by Konishi Co., Ltd.) as a solid, 200 parts by weight of YS polystar T145 as a tackifier resin, and 6 parts by weight of coronate L45 as a solid, and solids with toluene Was diluted to 20% to obtain a coating solution. Using this coating solution, the same processing as in Example 1 was performed to obtain an anti-slip adhesive film having a structure in which a polyethylene film-based adhesive film was laminated on a release film.
(Comparative Example 1)

Acrylic pressure-sensitive adhesive SZ-2647 was blended at a ratio of 100 parts by weight as a solid content and Coronate L45 was blended at a ratio of 3 parts by weight as a solid content, and diluted with toluene until the solid content was 20% to obtain a coating solution. Using this coating solution, the same operation as in Example 1 was performed to obtain a film having a structure in which an adhesive film of a polyethylene film base material was laminated on a release film.
(Comparative Example 2)

100 parts by weight of acrylic pressure-sensitive adhesive Nissetsu PE-118 (manufactured by Nippon Carbide Industries Co., Ltd.), 30 parts by weight of YS polystar T145 as a tackifier resin, and 3 parts by weight of coronate L45 as a hardener And diluted with toluene to a solid content of 20% to obtain a coating solution. Using this coating solution, the same operation as in Example 1 was performed to obtain a film having a structure in which an adhesive film of a polyethylene film base material was laminated on a release film.
(Comparative Example 3)

Prepare 100 parts by weight of acrylic adhesive SZ-2647 as solids, 20 parts by weight of YS Polystar S145 (manufactured by Yasuhara Chemical Co., Ltd.) as tackifier resin, and 3 parts by weight of coronate L45 as solids. The solution was diluted to a solid content of 20% to obtain a coating solution. Using this coating solution, the same operation as in Example 1 was performed to obtain a film having a structure in which an adhesive film of a polyethylene film base material was laminated on a release film.
(Comparative Example 4)

Acrylic pressure-sensitive adhesive SZ-2647 is blended at a ratio of 100 parts by weight as a solid content, 2 parts by weight of YS polystar T145 as a tackifier resin, and 3 parts by weight as a solid content of coronate L45, and the solid content is made 20% with toluene. The solution was diluted to obtain a coating solution. Using this coating solution, the same processing as in Example 1 was performed to obtain a film having a polyethylene film-based adhesive film laminated on a release film.
(Comparative Example 5)

Cello tape (registered trademark) (manufactured by Nichiban Co., Ltd.) was used as an adhesive film coated with a rubber adhesive.
(Comparative Example 6)

Adock 31B (manufactured by Sanei Kaken Co., Ltd.) was used as an adhesive film coated with a silicone-based adhesive.
About the obtained adhesive film, it measured with the evaluation method shown below. The obtained results are shown in Table 1.
(1) Measurement of internal HAZE of adhesive layer When producing each adhesive film of Examples 1 to 4 and Comparative Examples 1 to 3, the adhesive layer is laminated on the release film without attaching the polyethylene film as the base material. A sample having the above-described state was prepared, and a film having a structure in which the adhesive layer was sandwiched with a polycarbonate film having a thickness of 70 μm (Pure Ace: manufactured by Teijin Ltd.) was used as a sample for measuring HAZE in the adhesive layer. Here, HAZE caused by Pure Ace is assumed to be negligibly small.
For the measurement of HAZE, a haze meter NDH2000 (manufactured by Nippon Denshoku Industries Co., Ltd.) was used.

(2) Measurement of axial misalignment A ball shape processing test was performed as follows.
The lens is a plastic lens for spectacles with a fluorine-containing silane compound antifouling layer "Seiko Super Sovereign Care Coat" manufactured by Seiko Epson Corporation, frequency S = -7.00D, C = -3.00D Using.
Test method: This evaluation is performed when a lens L is ground into a predetermined frame shape by using a stabbing machine, and between the chuck portion (the part where the lens is fixed as the shaft of the processing machine) and the lens surface. This was done by observing the occurrence of axial misalignment caused by sliding.
First, a test lens was prepared, and the lens was set on a fixing jig. At this time, the lens containing astigmatism was fixed so that the astigmatism axis was in a specified direction (for example, 180 °). For those without astigmatism, a straight line passing through the optical center of the lens was marked. And it fixed so that this might become a regulation direction (for example, 180 degrees). A crab type frame with a large aspect ratio was prepared and used as a reference frame.
The adhesive film prepared in Examples and Comparative Examples was cut and pasted into a circular shape with a diameter of 25 mm on the convex surface or concave surface of the lens, and the lens was fixed to a ball grinder (“LE-8080” manufactured by NIDEK Co., Ltd.). A balling process was performed based on the frame data. The lens after the balling process was put in a reference frame, and the displacement of the astigmatic axis was measured with a lens meter. When a straight line passing through the optical center of the lens was marked, the angle of deviation between the scored line and the horizontal line passing through the optical axis of the reference frame was measured. Ten lenses were balled and the ratio of the axial deviation exceeding the allowable range was calculated. It should be noted that the allowable range of shaft misalignment was ± 2 ° or less.

It is a schematic front view which shows the use condition of the adhesive film for slip prevention of this invention.

Explanation of symbols

1 Anti-slip adhesive film 2 Work piece

Claims (6)

  A pressure-sensitive adhesive composition that is a pressure-sensitive adhesive film to be bonded to a workpiece, and in which the pressure-sensitive adhesive layer in contact with the workpiece is a polymer mainly composed of (meth) acrylic acid ester, a tackifier resin, and a crosslinking agent An anti-slip adhesive film characterized by comprising an object.   The tackifying resin is composed of one or a mixture of terpene resin, α-pinene, terpene phenol copolymer, rosin and rosin derivative, coumarone-indene resin, hydrocarbon resin, alkylphenol resin, xylene resin, aromatic petroleum resin. The pressure-sensitive adhesive film for preventing slipping according to claim 1.   2. The internal HAZE of an adhesive layer having a thickness of 20 μm is 1 or more by adding a tackifying resin that is incompatible with the polymer to a polymer mainly composed of (meth) acrylate. The adhesive film for slip prevention according to 2.   At least 3 parts by weight is a tackifying resin that is compatible with the polymer with respect to 100 parts by weight of the polymer having (meth) acrylic acid ester as a main component, and this tackifying resin is used as the internal HAZE of the adhesive layer having a thickness of 20 μm. The anti-slip pressure-sensitive adhesive film according to claim 1, wherein a quantity of 1 or more is added.   A pressure-sensitive adhesive film to be bonded to a workpiece, and a pressure-sensitive adhesive layer in contact with the workpiece of the pressure-sensitive adhesive film contains a polymer made of natural rubber or synthetic rubber, silicone rubber, urethane resin, a tackifier resin, and a crosslinking agent. An anti-slip pressure-sensitive adhesive film comprising the pressure-sensitive adhesive composition.   6. The anti-slip adhesive film according to claim 5, wherein a tackifying resin is added so as to be incompatible with the polymer.

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