JP2014196124A - Lid material - Google Patents

Abstract

[PROBLEMS] To provide a stable content adhesion prevention function that has sufficient heat sealability and content adhesion prevention, and that does not have the possibility of dropping off the adhesion prevention function material due to inclusion of large particles in the heat seal layer. Providing a lid. A cover material 20 is formed by laminating a base material layer 1, a sealant layer 3 and an adhesion preventing layer 4 and fusing to a fusion part provided on an adherend. The anchor layer 5 and the water repellent layer 6 are laminated on the sealant layer 3 in this order, and the anchor layer 5 is composed of large particles 7 having an average particle diameter of 1 to 100 μm and a binder for fixing the particles. The water layer 6 includes fine particles 9 having an average particle diameter of 5 to 500 nanometers and a binder for fixing the fine particles 9, and the binder of both the anchor layer 5 and the water repellent layer 6 includes at least inorganic or metal alkoxides. It contains 1 or more types, and the weight ratio of the binder and the fine particles 9 in the water repellent layer 6 is 1: 0.8 to 1: 0.4. [Selection] Figure 1

Description

  The present invention relates to a heat seal lid material mainly applied to containers for packaging foods. More particularly, the present invention relates to a lid material used for cup-shaped containers for packaging such as yogurt, jelly, pudding, jam, mousse, etc., and a lid material provided with an inner surface for preventing content adhesion.

  The lid used for the cup-shaped container is composed of a substrate / inorganic vapor deposition film / sealant layer from the outside. The lid of this configuration covers a top opening of a container filled with contents such as yogurt and seals the peripheral edge of the lid to the upper edge flange portion of the container as an adherend, thereby forming a sealed container. .

  Such a lid material is required to have heat sealability, adhesion, and easy peelability at the time of opening, and at the same time, non-adhesiveness of the content, that is, a material that does not easily adhere to the back surface of the lid material is desired. .

  When the contents adhere to the back surface of the lid member, there are problems such as waste due to the loss of the adhered contents and troublesome work to remove the adhered contents. In addition, when opened, deposits may scatter and stick to hands, fingers, clothing, or stain the surroundings.

  In order to solve these problems, a proposal has been made that the heat seal layer on the innermost surface of the lid material is a nonionic surfactant having an adhesion preventing effect or a polyolefin to which a water repellent additive is added. Such additives have a problem that the compatibility is so poor that only 10% by weight or less, preferably 7% or less can be blended, and the amount of surface precipitation varies greatly depending on the aging conditions, resulting in lack of stability. Therefore, the desired performance cannot be obtained sufficiently (Patent Document 1).

  In addition, the innermost layer is formed by forming a porous structure with a three-dimensional network structure with water-repellent oxide fine particles as an anti-adhesion layer without adding non-sticking additives such as surfactants to the heat seal layer of the lid. However, this anti-adhesion layer has fine particles and is inferior in heat resistance, and the storage time in a high-temperature environment becomes longer. It sinks into the hot melt resin layer, which is a sealing layer, and the adhesion preventing effect disappears. Further, in the contents filling process, particularly the sealing process, these obstruction factors are very troublesome in terms of handling (Patent Document 2).

  There is also a proposal to provide an adhesion preventing layer on the sealant layer. By using wet silica particles having a large average particle diameter of 2 to 7 μm for the adhesion preventing layer, the sinking of wet silica was reduced. Therefore, even if the high temperature environment or the drying temperature at the time of application becomes long, the adhesion preventing function can be maintained. However, since this particle size is large, it falls off from the adhesion preventing layer, the adhesion preventing function is likely to be uneven, and there is a problem in stability (Patent Document 3).

  In addition, proposals have been made to provide a highly water-repellent treatment for the surface of silicone elastomers and fluorine-containing elastomers, but they have poor sealing properties and are difficult to adapt to containers and packaging such as lids and pouches (Patent Documents) 4).

The lid member is required to have a high adhesion preventing function with respect to the contents containing fat. A high anti-adhesion function can be a factor that hinders the heat seal required for the anti-adhesion layer. Therefore, the weight ratio of the binder to the fine particles is very important. Increasing the weight ratio of the fine particles gives an effect of preventing adhesion, but leads to inhibiting the thermal adhesion between the sealant resin and the adherend in a conflicting manner.

JP 2002-37310 A Japanese Patent No. 4348401 Japanese Patent No. 4668352 JP 2002-69246 A

  The present invention has been made in view of the above problems, has sufficient heat sealability and content adhesion prevention, and the adhesion of the adhesion prevention functional material by including large particles in the heat seal layer, An object of the present invention is to provide a lid member having a stable content adhesion preventing function without the possibility of a sealing failure.

As means for solving the above problems, the invention according to claim 1 is characterized in that at least a base material layer, a sealant layer, and an adhesion preventing layer are laminated and fused to a fused portion provided on an adherend. A lid used for
In the structure in which the adhesion preventing layer is laminated on the sealant layer in the order of an anchor layer and a water repellent layer,
The anchor layer is composed of large particles having an average particle diameter of 1 to 100 μm and a binder for fixing the particles.
The water repellent layer is composed of fine particles having an average particle diameter of 5 to 500 nm and a binder for fixing the fine particles,
The binder of both the anchor layer and the water repellent layer contains at least one inorganic or metal alkoxide,
And the weight ratio of a binder and microparticles | fine-particles of a water repellent layer is 1: 0.8-1: 0.4, It is a lid | cover material characterized by the above-mentioned.

  In the invention according to claim 2, the large particles of the anchor layer are polyester resin, polyurethane resin, epoxy resin, melamine resin, phenol resin, silicone resin, acrylic resin, polystyrene resin, silicon oxide, aluminum oxide, The lid material according to claim 1, comprising at least one kind of titanium.

  Further, in the invention according to claim 3, the surface of the fine particles of the water repellent layer is at least of dimethylsilyl, trimethylsilyl, alkylsilyl group, aminoalkylsilyl group, methacrylsilyl group, dimethylpolysiloxane group, dimethylsiloxane group. The lid material according to claim 1 or 2, wherein the lid material is an inorganic oxide treated with one kind of functional group.

  The lid material of the present invention has a high anti-adhesion function for those whose contents contain fat, and has a stable heat-sealing property with no loss of the anti-adhesion functional material or seal failure. A lid can be provided.

It is an example of the layer structure of the lid | cover material of this invention, and is sectional drawing before filling and sealing. It is detailed sectional drawing of the adhesion prevention layer of this invention.

  Hereinafter, the embodiment in the lid | cover material 20 of this invention is described in detail using figures. FIG. 1 is a cross-sectional view showing an example of a layer structure of a lid member 20 according to the present invention. The lid member 20 has a base material layer 1, a barrier layer 2, and a sealant layer 3 laminated from the outside. In the innermost layer, an adhesion preventing layer 4 for preventing adhesion of contents is formed.

  The substrate layer 1 can be made of a simple substance such as paper, polyethylene terephthalate resin, stretched olefin resin such as polyethylene and polypropylene, polyamide resin, polyvinyl chloride resin, cellulose acetate and cellophane, or a laminate thereof.

  A secondary process such as printing / vapor deposition or metal foil bonding may be applied to the surface or the inner side of the single body or the laminated body to impart design properties.

  The barrier layer 2 is made of polyethylene, terephthalate film, stretched olefin resin film such as polyethylene or polypropylene, polyamide resin film, polyvinyl chloride resin film, cellulose acetate film, cellophane film, etc. on the surface of aluminum, silicon oxide, titanium oxide, oxide For example, aluminum is vapor-deposited or metal foil.

  The barrier layer 2 has functions of inhibiting penetration of the contents, preventing oxidative deterioration of the contents, suppressing volatilization of moisture, and preventing light deterioration of the contents.

  The sealant layer 3 is required to have both adhesion to the adherend and easy peelability. In particular, if the adhesiveness and easy peel property are good, the material is not limited, but a lacquer type resin material that dissolves and coats with a solvent is used. Ingredients include polyacrylate resin, urethane resin, melamine resin, amino resin, epoxy resin, polyethylene resin, styrene resin, polypropylene resin, polyester resin, cellulose resin, vinyl chloride resin, polyvinyl alcohol resin, ethylene vinyl acetate copolymer and Those composite materials are used. A hot-melt type or polyolefin type heat seal layer may also be used.

  This sealant layer 3 is easily fused with the adherend, and can be sealed with stable adhesiveness even in an environment such as impact such as dropping, pressurization during loading, and high temperature during storage. Can be easily peeled off and opened.

  As shown in FIG. 2, the adhesion preventing layer 4 is composed of an anchor layer 5 containing large particles 7 and a water repellent layer 6 containing fine particles 9 for reducing the contact area with the contents and enhancing the adhesion preventing effect. The

  The anchor layer 5 including the large particles 7 includes the large particles 7 and the anchor layer binder 8 for fixing the large particles 7, and the water repellent layer 6 includes the water repellent fine particles 9 and the water repellent layer binder 10. In order to strengthen the adhesion between the anchor layer 5 containing the large particles 7 and the water repellent layer 6, it is preferable to use the same kind of binder.

  The role of the anchor layer 5 including the large particles 7 is to make macro unevenness and the contents are in contact with the protrusions, and the contact area is smaller than that of the flat base material and helps to prevent the adhesion. It is to bear.

  Furthermore, a water-repellent layer 6 is provided on the upper layer so that nano-order fine particles 9 which have been subjected to a water-repellent surface treatment are fixed by a binder, which is chemically water-repellent and water-repellent. Since the fine particles imparted with a finer unevenness, the contact area with the contents is further reduced.

  The large particles 7 are not limited to the material, but are polyester resin, polyurethane resin, epoxy resin, melamine resin, phenol resin, silicone resin, acrylic resin, polystyrene resin, silicon oxide, aluminum oxide, titanium dioxide or a composite thereof. Materials can be used. The average particle size of the large particles 7 is 1 to 100 μm, preferably 10 to 50 μm.

  As the water-repellent fine particles 9, inorganic oxides that have been subjected to a water-repellent surface treatment with organic functional groups can be used. As the inorganic oxide, one or a combination of silicon oxide, aluminum oxide, titanium oxide and the like is used. As the functional group, at least one of dimethylsilyl group, trimethylsilyl group, alkylsilyl group, aminoalkylsilyl group, methacrylsilyl group, dimethylpolysiloxane group, and dimethylsiloxane group, particularly trimethylsilyl group and dimethylpolysiloxane Water-repellent silica fine particles having a group are preferred.

  The water repellent silica fine particles 9 may have an average primary particle size of 500 nm or less. When the particle size of the water-repellent silica fine particles 9 is larger than 500 nm, the water-repellent fine particles 9 are too large and easily fall off from the adhesion preventing layer 4.

  Further, the fusion property with the container body is affected, and the fusion property is lowered at a low temperature or in a short time. In addition, when the binder layer is thin, problems such as dropout and lowering of fusibility tend to increase, and the problem of lowering productivity arises.

  The anchor layer binder 8 can be one or more metal alkoxides, and an aqueous solution mainly composed of a hydrolyzate thereof, a water / alcohol mixed solvent, and a silane coupling agent.

The metal alkoxide is represented by M (OR) _n . M is a metal atom. Examples of M include Li, Na, Cu, Mg, Ca, Sr, Ba, Zn, B, Al, Ga, Y, Si, Ge, Pb, P, Sb, Ta, W, La, Nd, Ti, etc. Is mentioned. n is the valence of M. R represents a lower alkyl group, for example, an alkyl group having 1 to 4 carbon atoms.

  Specific examples of the alkylosides include alkoxysilanes such as methyltrimethoxysilane, aluminum propoxide, titanium isopropoxide, zinc t-butoxide, zinc n-butoxide, calcium ethoxide, iron ethoxide, vanadium isopropoxide, tin t. -Butoxide, lithium ethoxide, beryllium ethoxide, boron ethoxide, phosphorus ethoxide, phosphorus methoxide, magnesium methoxide, magnesium ethoxide and the like.

  As the metal alkoxide actually used, it is preferable to use tetraethoxysilane, triisopropoxyaluminum, or a mixture thereof. Since the fine particles in the adhesion preventing layer are very small and have a strong secondary cohesive force, not only can a porous structure be imparted by setting the weight ratio of the binder to the fine particles to be 1: 0.8 to 1: 0.4, but also adhesion. The cohesive force in the prevention layer and the adhesion with the sealant layer can be strengthened.

  The apparatus for coating the anchor layer 5 and the water repellent layer 6 is not particularly limited, and known methods such as gravure coating, roll coating, doctor blade coating, die coating, bar coating, and spray coating can be used.

  Hydrolysis of the alkoxide added to the water repellent layer binder 10 repeats dehydration condensation in the drying step and the aging step to form an oxide coating film.

  At the time of heat sealing for sealing the contents, the glass film of the water repellent layer binder 10 breaks due to the pressure applied to the seal bar. In the cracked gap, the sealant layer 3 and the adherend are thermally welded. Since the structure is such that the particles 7 are embedded and thrown into the adherend side, a throwing effect is also obtained, and a sufficient sealing strength is ensured.

  The adherend is required to have adhesiveness and easy peelability with a sealant. In general, polypropylene, polyethylene, polystyrene, or the like is used as a material for the fused portion. The container outer layer portion other than the fused portion to be sealed also serves as a decoration, and is formed into a multilayer or printed. Moreover, you may laminate | stack the raw material which improves a barrier property.

  Examples of the present invention will be described below.

An imitation paper having a thickness of 52.3 g / m ² and an aluminum vapor-deposited polyethylene terephthalate film, which is an inorganic vapor-deposited film 2 having a thickness of 16 μm, were bonded as a base material layer 1 by a dry lamination method. A primer layer made of a polyester resin and an isocyanate curing agent was further coated on the aluminum vapor-deposited polyethylene terephthalate film side of the laminated body.

  Thereafter, a lacquer type sealant layer 3 mainly composed of polyacrylate was further coated on the primer layer.

For the anchor layer 5, tetraethoxysilane Si (OC ₂ H ₅ ) ₄ hydrolyzed with 0.1 N hydrochloric acid solution and a silane coupling agent having a good compatibility with an acrylic resin is used as tetraethoxysilane. 0.1 mol of silane is added and mixed with the large particles 7 having an average particle size of 10 μm dispersed with alcohol, and adjusted so that the solid content of the coating liquid is 20%. Coated on top.

Thereafter, the surface of the water-repellent layer 6 is subjected to a water-repellent treatment with a hydrolyzed solution of tetraethoxysilane Si (OC ₂ H ₅ ) ₄ hydrolyzed with a 0.1 N hydrochloric acid solution and dimethylpolysiloxane to obtain an alcohol. The fine particles 9 having an average particle diameter of 12 nm dispersed in the mixture are mixed thoroughly, adjusted so that the solid content of the coating liquid becomes 10%, and the water-repellent layer 6 is laminated on the anchor layer 5 to prevent adhesion. A lid 20 having a layer 4 was obtained.

  <Effect of large particle 7 average particle size>

  A lid 20 was obtained in the same manner as in Example 1 except that the large particles 7 of the anchor layer 5 were those having an average particle diameter of 20 μm.

  A lid 20 was obtained in the same manner as in Example 1 except that the large particles 7 of the anchor layer 5 were those having an average particle diameter of 50 μm.

  A lid 20 was obtained in the same manner as in Example 1 except that the large particles 7 of the anchor layer 5 were those having an average particle diameter of 100 μm.

<Evaluation method>
The adhesion prevention evaluation was performed as follows. For the liquid droplets, the lid 20 is attached to the base inclined at 40 degrees with the adhesion preventing layer 4 of the lid 20 facing up, and the yogurt (Danone) is placed on the adhesion preventing layer 4 of the inclined lid 20. About 0.5 ml of Danone bioplane sweetened (Japan) was dropped from 2 cm above the inclined surface, and the adhesion state of the droplet was visually observed and evaluated.
A: No adhesion of droplets (adhesion prevention effect is recognized)
○: Slight adhesion, but most of the droplets do not adhere (adhesion prevention effect is recognized)
×: Adherence of liquid droplets (adhesion prevention effect is not recognized)
It was.

The film strength was evaluated as follows.
Apply cellophane tape (Cellotape (registered trademark) CT-10 made by Nichiban Co., Ltd.) and rub it with a plastic eraser on the cellophane tape. The presence or absence of the aqueous fine particles 5 was confirmed.
○: The water-repellent fine particles 5 are not taken on the cellophane tape.
X: The water-repellent fine particles 5 are taken on the cellophane tape.

The 200 ° C. heat resistance evaluation was performed as follows. The anti-adhesion property after being allowed to stand in a 200 ° C. oven for 10 minutes was evaluated.
○: No change in yogurt adherence before and after placing in the oven ×: Yogurt adherence prevention property disappeared after placing in the oven.

  Table 1 shows the evaluation results when the influence of the average particle diameter of the large particles 7 is observed.

表１の結果から、凹凸付与アンカー層の大粒子７が１００μｍと大きいことで、バインダーがその大きさを支えきれずに膜強度が弱い傾向が出て、大粒子７が小さくなると、付着防止性が悪くなる。

From the results of Table 1, when the large particle 7 of the irregularity imparting anchor layer is as large as 100 μm, the binder tends not to be able to support its size and the film strength tends to be weak. Becomes worse.

<Influence of binder of anchor layer 5 and water repellent layer 6>
<Comparative Example 1>
A lid 20 was obtained in the same manner as in Example 2 except that tetraethoxysilane Si (OC ₂ H ₅ ) ₄ which is a binder of the anchor layer 5 was changed to polyacrylate.

<Comparative example 2>
A lid 20 was obtained in the same manner as in Example 3 except that tetraethoxysilane Si (OC ₂ H ₅ ) ₄ which is a binder of the anchor layer 5 was changed to polyacrylate.

<Comparative Example 3>
Except for changing the tetraethoxysilane Si (OC ₂ H ₅ ) ₄ which is the binder of the anchor layer 5 to polyacrylate, and changing the binder of the water repellent layer 6 from tetraethoxysilane to polyacrylate, the same as in Example 2. A lid member 20 was obtained.

<Comparative example 4>
Except that the tetraethoxysilane Si (OC ₂ H ₅ ) ₄ which is the binder of the anchor layer 5 is changed to polyacrylate, and the binder of the water repellent layer 6 is changed from tetraethoxysilane to polyacrylate, the same as in Example 3. A lid member 20 was obtained.

  Table 2 shows the evaluation results when the influence of the binder of the anchor layer 5 and the water repellent layer 6 is seen.

アンカー層５のバインダー成分を樹脂系にすると、２００℃耐熱性が落ち、撥水層６のバインダー成分を樹脂系にすると、撥水層６が樹脂中に溶けこんでしまうため、付着防止性が消失し、膜強度も劣化する。

When the binder component of the anchor layer 5 is resin-based, heat resistance at 200 ° C. is lowered, and when the binder component of the water-repellent layer 6 is resin-based, the water-repellent layer 6 is dissolved in the resin. Disappear and film strength deteriorates.

  <Influence of average particle diameter of fine particles 9 in water repellent layer 6>

  A lid 20 was obtained in the same manner as in Example 2 except that the fine particles 9 in the water repellent layer 6 had an average particle diameter of 4 nm.

  A lid 20 was obtained in the same manner as in Example 2, except that the average particle diameter of the fine particles 9 in the water repellent layer 6 was 6 nm.

  A lid was obtained in the same manner as in Example 2 except that the fine particles 9 in the water repellent layer 6 had an average particle diameter of 500 nm.

  <The lid | cover material 20 was obtained like Example 2 except having used the thing of the average particle diameter of the microparticles | fine-particles 9 in the comparison 6 being 550 nm.

  Table 3 shows the evaluation results when the influence of the binder on the particle size of the fine particles 9 of the water-repellent layer 6 was observed.

撥水層６における微粒子９の平均粒子径を４ｎｍ、６ｎｍ、５００ｎｍにしても、良好な特性を示したが、５５０ｎｍにしたものは、付着防止性が低下した。

Even when the average particle diameter of the fine particles 9 in the water repellent layer 6 was 4 nm, 6 nm, and 500 nm, good characteristics were exhibited.

  <Influence of surface-treated water-repellent functional group of fine particles 9 in water-repellent layer 6>

  A cover material 20 was obtained in the same manner as in Example 2 except that the surface-treated water-repellent functional group of the fine particles 9 in the water-repellent layer 6 was changed to trimethylsilyl.

<Comparative Example 6>
A lid 20 was obtained in the same manner as in Example 2 except that the surface treatment of the fine particles 9 in the water repellent layer 6 was not performed.

  Table 4 shows the evaluation results when the influence of the surface-treated water-repellent functional groups of the fine particles 9 in the water-repellent layer 6 is observed.

撥水層６における微粒子９の表面を撥水処理をジメチルポリシロキサン、トリメチルシリルにしたものは良好な付着防止性を示したが、処理を行わないと、付着防止性を持たないだけでなく、耐熱性も無かった。

The surface of the fine particles 9 in the water-repellent layer 6 with water-repellent treatment treated with dimethylpolysiloxane and trimethylsilyl showed good anti-adhesion properties. There was no sex.

  <Influence of the ratio of the binder and the fine particles 9 in the water repellent layer 6>

  A lid 20 was obtained in the same manner as in Example 2 except that the ratio of the binder to the fine particles 9 in the water repellent layer 6 was 1: 0.8.

  A lid 20 was obtained in the same manner as in Example 2 except that the ratio of the binder to the fine particles 9 in the water repellent layer 6 was 1: 0.6.

<Comparative Example 7>
A lid 20 was obtained in the same manner as in Example 2 except that the ratio of the binder and the fine particles 9 in the water repellent layer 6 was 1: 1.

<Comparative Example 8>
A lid 20 was obtained in the same manner as in Example 2 except that the ratio of the binder and the fine particles 9 in the water repellent layer 6 was 1: 0.2.

  Table 5 shows the evaluation results regarding the influence of the ratio between the binder and the fine particles 9 in the water repellent layer 6.

撥水層６における撥水性微粒子９が対バインダー重量比で、０．４以上で良好なヨーグルト非付着性が確保でき、撥水性微粒子９の量が減ることで、ヨーグルト非付着性が落ち込む。

When the water-repellent fine particles 9 in the water-repellent layer 6 have a weight ratio of 0.4 or more to the binder, good yogurt non-adhesiveness can be secured, and the amount of the water-repellent fine particles 9 is reduced, so that the yogurt non-adhesiveness falls.

<Influence of binder type and binder / fine particle 9 ratio>
<Comparative Example 9>
The lid material 20 is the same as in Example 2 except that the binder of the anchor layer 5 and the binder of the water repellent layer 6 are polyacrylate and the ratio of the binder to the fine particles 9 in the water repellent layer 6 is 1: 0.4. Got.

<Comparative Example 10>
The lid 20 is the same as in Example 2 except that the binder in the anchor layer 5 and the binder in the water repellent layer 6 are polyacrylate and the ratio of the binder to the fine particles 9 in the water repellent layer 6 is 1: 0.2. Got.

<Comparative Example 11>
Cover material in the same manner as in Example 2 except that the binder of the anchor layer 5 and the binder of the water repellent layer 6 are ethylene vinyl acetate and the ratio of the binder to the fine particles 9 in the water repellent layer 6 is 1: 0.1. 20 was obtained.

  Table 6 shows the evaluation results regarding the influence of the binder type and the ratio of the binder and the fine particles 9 in the water repellent layer 6.

アンカー層５のバインダーや撥水層６のバインダーとして、テトラエトキシシランは有効であり、また撥水層６におけるバインダーと微粒子９との比率を１：０．２と低くすると、ヨーグルト非付着性が落ち込み、そして、ヨーグルト付着防止性と膜強度の両立を見ると、バインダーと微粒子９との重量比で、１：０．８〜１：０．４が最適であることが分かる。

Tetraethoxysilane is effective as a binder for the anchor layer 5 and a binder for the water repellent layer 6, and when the ratio of the binder to the fine particles 9 in the water repellent layer 6 is reduced to 1: 0.2, yogurt non-adhesiveness is obtained. From the viewpoint of the balance between the depression and the yogurt adhesion preventing property and the film strength, it is understood that the optimum weight ratio of the binder to the fine particles 9 is 1: 0.8 to 1: 0.4.

The lid member 20 of the present invention is as described above, and can be designed to withstand, for example, troubles on a machine where strong heating is assumed. Further, when the lid is peeled off, a large amount of contents do not adhere to the inner surface of the lid member 20. As a result, the contents can be used effectively, and the contents remain little after using the container. Even when they are to be discarded, they can be easily separated and disposed of with simple water washing. There is.

DESCRIPTION OF SYMBOLS 1 ... Base material layer 2 ... Inorganic vapor deposition film 3 ... Sealant layer 4 ... Adhesion prevention layer 5 ... Anchor layer 6 ... Water-repellent layer 7 ... Large particle 8 ... Anchor layer binder 9 ... fine particles 10 ... water-repellent layer binder 20 ... lid material

Claims (3)

At least a base material layer, a sealant layer, an adhesion preventing layer are laminated, and a lid material used by fusing to a fusion part provided on an adherend,
In the structure in which the adhesion preventing layer is laminated on the sealant layer in the order of an anchor layer and a water repellent layer,
The anchor layer is composed of large particles having an average particle diameter of 1 to 100 μm and a binder for fixing the particles.
The water repellent layer is composed of fine particles having an average particle diameter of 5 to 500 nm and a binder for fixing the fine particles,
The binder of both the anchor layer and the water repellent layer contains at least one inorganic or metal alkoxide,
And the weight ratio of a binder and microparticles | fine-particles of a water repellent layer is 1: 0.8-1: 0.4, The lid | cover material characterized by the above-mentioned.   The large particles of the anchor layer include at least one of polyester resin, polyurethane resin, epoxy resin, melamine resin, phenol resin, silicone resin, acrylic resin, polystyrene resin, silicon oxide, aluminum oxide, and titanium dioxide. The lid according to claim 1.   The surface of the fine particles of the water repellent layer is treated with at least one functional group of dimethylsilyl group, trimethylsilyl group, alkylsilyl group, aminoalkylsilyl group, methacrylsilyl group, dimethylpolysiloxane group, and dimethylsiloxane group. The lid material according to claim 1, wherein the lid material is an inorganic oxide.

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