JPH08144198A - Substrate for release paper and release paper - Google Patents

Abstract

PURPOSE: To obtain a substrate for release capable of directly applying a silicone coating liquid without using film laminate, exhibiting excellent releasability and reutilizing and its release paper. CONSTITUTION: This substrate for release paper is obtained by applying a coating liquid obtained by blending a resin selected from a polyacrylamide-acrylic acid ester copolymer, a styrene-butadiene copolymer latex having -5 to -15 deg.C glass transition temperature, a polystyrene-acrylic acid ester polymer and a polyvinyl alcohol copolymer with kaolin which is a plate like pigment (for forming dense coating layer), a phosphated starch and/or acetylated starch as an adhesive and a polyolefin-based wax as a lubricant for improving slip onto a raw paper containing a wood pulp such as broad-leaved tree core kraft pulp or conifer core kraft pulp as a main raw material to form a barrier layer. This release paper excellent in releasability is obtained at a low cost by applying a silicone liquid onto the substrate for release. The resultant substrate for release has effect for suppressing permeation of silicone and can be reutilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release paper substrate. More specifically, the present invention mainly relates to an adhesive label to be attached to the surface of a product or a product container, an adhesive seal, and a base material for release paper of an adhesive tape used for packing a packaging container, and particularly to a base paper. A release paper substrate which can be directly coated with a release agent such as a silicone resin without the need for laminating a film such as polyethylene on the top, and a release layer having a release agent layer formed on the substrate. It's about paper.

[0002]

2. Description of the Related Art Conventionally, as a release paper substrate coated with a release agent such as a silicone resin or a fluorine resin and used for an adhesive label, an adhesive tape or the like, a film laminated paper such as polyethylene laminated paper or a glassine paper is used. Such as densified base paper, clay coated paper, and super calendered paper are known.

[0003] Among these base materials, for the purpose of suppressing the permeation of the above silicone coating liquid as much as possible and maximizing the releasability, wood-based wood-based high-quality paper, single-glossy paper, and Thickness of 1 on the surface of kraft paper by extrusion method
A film-laminated paper having a film layer such as polyethylene or polypropylene of about 0 to 25 microns is generally used. However, in the release paper substrate produced by the method of laminating the above film, the film forms a strong continuous film, and since it is insoluble in water, the substrate is recovered again and the papermaking process is performed. It is impossible to recycle it, which is a big problem in industrial waste treatment today.

On the other hand, a densified base paper, such as glassine paper, which is made of extremely beaten pulp as a raw material is used as a base paper for a release paper, and a release agent such as a silicone resin is directly applied to the base paper without laminating a film. A coating method is being tried. However, such a base paper has a drawback that it cannot be recycled because it is not easily disintegrated in water because the pulp as a raw material is beaten to an extreme degree and used, and the interfiber bond is strengthened by calendering or the like. are doing. Furthermore, even if it is possible to disintegrate in water by strengthening mechanical force and introducing chemical treatment, it is difficult to reuse it as a raw material for general paper because the fiber is significantly damaged by strengthening the beating treatment. Is.

On the other hand, Japanese Patent Publication No. 1-35959 and Japanese Unexamined Patent Publication No. 4-23876 disclose a base paper for a release paper which can be directly coated with a silicone coating liquid without laminating a film. There is disclosed a clay coat type base material having a barrier layer formed by applying a coating material containing an inorganic pigment and an organic adhesive as a main component on the surface. In such a substrate, it has been recognized that the barrier layer covers minute voids (hereinafter referred to as pinholes) in the base paper and stops the voids. However, innumerable fine pores are formed between the pigments in the barrier layer, and there is a problem that the silicone coating solution penetrates into the base paper through the fine pores. Therefore, it is necessary to apply a large amount of silicone resin as compared with film laminated paper.

Further, even in a super calendered type base material that is mechanically pressed and densified, it is still impossible to completely close the minute inter-fiber voids, and further, the silicone coating liquid is brought into contact with the base material at the same time. Due to the swelling of the material, it is impossible to impart excellent barrier properties comparable to those of film laminated paper.

Further, in Japanese Patent Laid-Open No. 4-2900,
A method of applying starch as a barrier agent is disclosed, but since the starch itself is buried in the pinhole, it cannot play the role of stopping the pinhole having a pore size of 1 to 200 microns or more. Therefore, it is extremely impossible to block the permeation of the silicone coating solution only by the barrier layer of starch. For the above reasons, there is a strong demand for a base material for release paper that has excellent barrier properties comparable to film laminated paper and that can be directly coated with a silicone coating liquid, but these requirements are still sufficient. No fillable substrate is provided.

[0008]

DISCLOSURE OF THE INVENTION The present invention produces a release paper which does not require film lamination like polyethylene laminated paper and can be directly coated with a silicone coating solution and which has excellent releasability. It is intended to provide a base material for release paper which can be used. The present invention also provides a release paper substrate that can be used in a papermaking process by collecting used release paper substrates. further,
It is an object of the present invention to provide a release paper in which a solvent-type or solvent-free release agent layer is formed on the base material.

[0009]

The inventors of the present invention have excellent barrier properties comparable to those of the base paper without laminating a film such as polyethylene on the base paper, and can be easily disintegrated in water for reuse. In order to obtain a possible base material for release paper, as a result of earnest research on the material of the barrier layer formed on the base paper, finally, a base material for release paper which can satisfy these requirements has been obtained. That is, in a film laminated paper such as polyethylene laminated paper, as a result of detailed analysis of the function of this film, the present inventors have found that it is on a porous and liquid-absorbent base paper produced mainly from wood pulp. , (1) formation of a barrier layer capable of simultaneously suppressing the permeation of the silicone coating solution and (2) simultaneously blocking pinholes having a pore diameter of 1 to 200 microns scattered on the base paper. It has been concluded that this is an effective means of obtaining a substrate having barrier properties comparable to film laminated paper.

As a result of further earnest studies conducted by the present inventors to establish this means, excellent film forming properties are obtained as a material capable of simultaneously achieving a silicone coating solution penetration preventing function and a pinhole sealing function. A resin selected from the specific polyvinyl alcohol having, a styrene-butadiene copolymer latex, a polyacrylamide-acrylic acid ester copolymer, and a polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer is an excellence satisfying this requirement. The present invention has been completed by finding that the above effects are exhibited. The base material for release paper according to the present invention, which can solve the above problems, is described below.

(1) A polyacrylamide-acrylic acid ester copolymer, a styrene-butadiene copolymer latex having a glass transition temperature in the range of -5 ° C to -15 ° C, and a base paper mainly made of wood pulp. A release paper substrate having a barrier layer containing one or more resins selected from polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer.

(2) The base material for release paper according to the above (1), wherein the barrier layer contains a pigment.

(3) The release paper substrate as described in (2) above, wherein the pigment in the barrier layer is a plate-like pigment.

(4) The above-mentioned (1), wherein the barrier layer contains one or more selected from phosphoric esterified starch and acetylated starch as an adhesive.
The base material for release paper according to (2) or (3).

(5) The release paper substrate as described in (1), (2), (3), or (4) above, wherein the barrier layer contains a polyolefin wax as a lubricant.

(6) A barrier paper containing polyvinyl alcohol having a degree of polymerization of 200 to 2000 is provided on a base paper mainly made of wood pulp, and the barrier layer further contains a polyolefin wax as a lubricant. A base material for release paper, which is characterized by:

(7) The release paper substrate according to (6) above, wherein the polyvinyl alcohol is a polyvinyl alcohol having a degree of polymerization of more than 800 and not more than 2000.

(8) A base paper containing wood pulp as a main raw material has a barrier layer containing polyvinyl alcohol having a degree of polymerization in the range of 200 to 800, and the barrier layer further comprises phosphate esterified starch, And / or acetylated starch is contained, The base material for release paper characterized by the above-mentioned.

(9) The release paper substrate as described in (8) above, wherein the barrier layer contains a polyolefin wax as a lubricant.

(10) The release paper substrate as described in (6), (7), (8) or (9) above, wherein the barrier layer contains a pigment.

(11) The release paper substrate as described in (10) above, wherein the pigment in the barrier layer is a plate-like pigment.

The present invention further relates to the following release paper. (12) A release paper in which a solvent-type or solvent-free release agent layer is formed on the barrier layer of the release paper substrate described in (1) to (10) above.

(13) The release paper according to the above (12), wherein the release agent layer is a layer formed of an ultraviolet curable solventless silicone resin containing an epoxy group-containing organopolysiloxane as a main component.

The base paper used in the present invention is a broad-leaf bleached kraft pulp, a softwood bleached kraft pulp, or other chemical pulp or mechanical pulp as a main raw material. Alternatively, it includes high-quality paper, medium-quality paper, single-glossy paper, kraft paper, and the like, which are made by a cylinder paper machine. Organic and inorganic pigments in the base paper,
In addition, a paper making auxiliary agent may be included. A barrier layer is provided on this base paper to make a release paper substrate. The resins used for the barrier layer in the present invention will be described below in order.

Polyacrylamide used in the present invention
Acrylic ester copolymers are polyacrylamide having a molecular weight of 100,000 to 500,000 produced by the polymerization of acrylamide monomers, and methyl acrylate and ethyl acrylate produced by the acrylonitrile alcoholysis method or the propylene direct oxidation method. , Butyl acrylate, 2-ethyl-hexyl acrylate, and the like are water-soluble synthetic resins obtained by copolymerizing an acrylic acid ester polymer, for example, "HSB260" and "HSB2450" commercially available from Sanyo Chemical Industry Co., Ltd. To do.

Polyacrylamide, which is generally widely used as a water-soluble binder, is extremely excellent in adhesion to pigments and base paper, but it cannot exert a sufficient effect for suppressing penetration of silicone coating solution. On the other hand, the acrylic ester copolymer exhibits an excellent effect in suppressing the penetration of the silicone coating liquid, but has a weak binding force with the pigment and the base paper. The polyacrylamide-acrylic acid ester copolymer used in the present invention has both the excellent binding force of polyacrylamide and the excellent silicone coating solution permeation suppression effect of acrylic acid ester, and is extremely excellent. It is a barrier layer material.

The styrene-butadiene copolymer latex used in the barrier layer of the present invention and having a glass transition temperature in the range of -5 ° C to -15 ° C is a synthetic resin having excellent film-forming properties, such as styrene, Aromatic vinyl monomers such as α-methylstyrene, aliphatic conjugated diene monomers such as 1,3-butadiene and 2-methyl-1,3-butadiene, ethylenic unsaturation such as acrylic acid and methacrylic acid The acid glass monomer, acrylonitrile monomer, ethylenically unsaturated carboxylic acid alkyl ester, ethylenically unsaturated carboxylic acid amide, other organic carboxylic acid, and derivatives thereof have a glass transition temperature of -5 ℃ ~ -15 ℃
It is obtained by copolymerizing any monomer by a known method so as to fall within the range of, for example, "JSR0624 (glass transition temperature -14 ° C)" commercially available from Japan Synthetic Rubber Co., Ltd. "JSR0691 (glass transition temperature-5
℃) ”and the like.

By the way, when the glass transition temperature of the styrene-butadiene copolymer latex exceeds -5 ° C, the film-forming property of the barrier layer is poor and it is impossible to prevent the penetration of the solvent or the silicone coating liquid. On the other hand, when the glass transition temperature of the styrene-butadiene copolymer latex is less than −15 ° C., the tackiness of the barrier layer is increased, and the paper roll, calender roll, etc. are soiled in the barrier layer coating step, and the operability is significantly reduced. Not only that, there is a problem called so-called blocking in which papers that have been wound up or stacked are stuck to each other.

The polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer used in the present invention is formed by polystyrene produced by polymerization of a styrene monomer, an alcoholysis method of acrylonitrile, or a propylene direct oxidation method. Methyl acrylate, ethyl acrylate, butyl acrylate, polymer of acrylic acid ester such as 2-ethyl-hexyl acrylate, polyvinyl alcohol having any degree of saponification, degree of polymerization, or unsaturated carboxylic acid partially, or Completely esterified, acetoacetic acid esterified, etc.,
It is a copolymer composed of three kinds of so-called post-modified polyvinyl alcohols, for example, "PAE21", "PAE24", "PAE25", which are commercially available from Arakawa Chemical Industry Co., Ltd.
"PAE28" or the like corresponds.

The polyvinyl alcohol used in the present invention has a degree of polymerization of 200 to 2000. If the degree of polymerization is less than 200, the desired barrier properties cannot be obtained because the film-forming property and film strength are poor. On the other hand, if the degree of polymerization exceeds 800, the tackiness of polyvinyl alcohol becomes excessive, Since the adhesion of polyvinyl alcohol to the surface of the cylinder of the drier after coating and to the surface of the calender, which is the finishing equipment, becomes remarkable, which in turn causes defective coating, and it is difficult to form a uniform barrier layer. However, even when polyvinyl alcohol having a high degree of polymerization exceeding 800 is used, it is possible to reduce the tackiness of the polyvinyl alcohol by using an appropriate lubricant together. As the polyvinyl alcohol used in the present invention, in addition to polyvinyl alcohol having any degree of saponification, unsaturated carboxylic acid, or a part thereof, complete ester, or so-called post-modified polyvinyl alcohol such as acetoacetic acid esterification is also optionally used. Can be used.

Examples of polyvinyl alcohol that can be used in the present invention include "GL03 (polymerization degree 300)" and "GL05 (polymerization degree 5) commercially available from Nippon Synthetic Chemical Industry Co., Ltd.
00) ”,“ NL05 (polymerization degree 500) ”,“ KL05
(Polymerization degree 500) "," KP08 (Polymerization degree 800) ",
"NM-14 (polymerization degree 1400)", "NH-17Q
(Polymerization degree 1700) "," KH-20 (Polymerization degree 200
0) ”,“ GH-20 (polymerization degree 2000) ”, and“ PVA103 (polymerization degree 30) commercially available from Kuraray Co., Ltd.
0) ”,“ PVA105 (polymerization degree 500) ”,“ PVA
203 (polymerization degree 300) "," PVA205 (polymerization degree 5
00) "," PVA-110 (degree of polymerization 1000) ",
"PVA117 (degree of polymerization 1700)", "PVA-21
0 (degree of polymerization 1000) "," PVA-217 (degree of polymerization 1
700) ”and the like.

As a means for preventing the above-mentioned barrier layer from adhering to the surface of the cylinder of the dryer, the dryer canvas, and the surface of the machine calender or the super calender, which is the finishing equipment, the present inventors have made "slip" on the surface of the barrier layer. We also examined the improvement method by improving. As a simple method for improving the "slippage" of the surface of the barrier layer, first, carboxylic acid type lubricants such as calcium stearate type, zinc stearate type, stearic acid amide type, which are widely marketed as lubricants, and further lecithin type and calcium type lubricants. An attempt was made to blend a vana wax type lubricant and a monostearyl amine ethylene oxide type lubricant into the barrier layer coating liquid. However, when these lubricants were used, slippage of the barrier layer was improved in all cases, but the barrier property, which is the most important issue for the release paper substrate, was significantly reduced by the addition of the lubricant. did.

Therefore, as a result of further investigations by the present inventors to investigate the cause of the above-mentioned deterioration of the barrier property and to establish an improvement measure, the cause of the decrease in the barrier property is the barrier layer due to the addition of a lubricant. It was clarified that it was due to the inhibition of the film formation of the adhesive inside. Further, the film formation of the adhesive is caused by hydrogen bonding of a hydroxyl group or a carboxylic acid group contained as a functional group in the adhesive molecule, and alkali metal, alkaline earth metal, amine ,
It was found that cationic groups such as and amide groups inhibit the film formation.

The present inventors have searched for a lubricant which does not contain a cationic group such as an alkali metal, an alkaline earth metal, an amine and an amide group, which is a factor for inhibiting the film formation of the above-mentioned adhesive. As a result of continuing the research, the polyolefin wax can improve the sliding property without lowering the barrier property, and the cylinder surface of the dryer after coating, the dryer canvas, and the machine calender and supermarket as finishing equipment. It has been found to be an excellent material that can prevent the barrier layer from adhering to the surface of the calender. Further, when the present inventors blended this polyolefin wax with a high-polymerization degree polyvinyl alcohol having a degree of polymerization of 800 or more, the above-mentioned tackiness was eliminated, and the barrier property was lowered due to stains on the cylinder of the dryer or the surface of the calendar. I found that I can solve.

The polyolefin wax used in the present invention is an aqueous emulsion of a polymer wax containing ethylene hydrocarbons such as ethylene, propylene, butylene, and amylene as a unit, and is commercially available from San Nopco. "Slip-Aid SL140" and "Cemipearl W400" commercially available from Mitsui Petrochemical Co., Ltd. can be used.

A pigment may be added to the resin having solvent resistance and film-forming property used in the present invention. There are no particular restrictions on the type of pigment and the blending ratio, and inorganic pigments such as kaolin, talc, calcium carbonate, titanium dioxide, and aluminum hydroxide can be appropriately selected and used. Compared with spherical pigments, plate-like pigments generally reduce the porosity and can form a dense coating layer. Therefore, the use of plate-like pigments such as kaolin is preferable in terms of quality.

It should be noted that excellent resistance is obtained in both cases where a coating liquid containing only the above resin as a main component is used as the barrier agent or a coating liquid in which a pigment is mixed with the above resin is used. Although it is possible to form a barrier layer having a solvent-based property and a silicone coating solution permeation suppression effect, in order to further strengthen the binding force between resins or between a resin and a pigment, phosphoric esterified starch, and /
Alternatively, it is preferable to add acetylated starch.

Raw starch is classified into cornstarch, potato starch, tapioca starch, sweet potato starch, waxy cornstarch, etc. depending on the plant from which it is separated, and further modified by physical and / or chemical treatment depending on the application. Is applied. The types of modified starch include, for example, oxidized starch, acid-treated starch, dextrin, enzyme-treated starch, starch ether,
It is roughly classified into starch derivatives such as starch ester, crosslinked starch and graft starch. The phosphate esterified starch and acetylated starch used in the present invention are
It is included in the starch ester among them, and because of its excellent film-forming ability, it exhibits an excellent barrier property that cannot be obtained with other starches.

Phosphate-esterified starch is prepared by impregnating starch with phosphate or sodium polyphosphate and then adding 100
It is obtained by heating to a high temperature of ℃ or more and causing a solid phase reaction, and is commercially available from Matsutani Chemical Co., Ltd., for example, "Neil gum A55", "Neil gum A85", "Neil gum A16".
0 ”and the like. In addition, acetylated starch is obtained by adding vinyl acetate monomer or acetic anhydride to starch slurry and reacting the mixture under alkaline conditions. For example, "National 78-" is commercially available from National Starch and Chemicals. 0338 "and the like.

Needless to say, the above-mentioned polyolefin wax can be added to the above-mentioned coating material containing a pigment or the like as a lubricant which does not deteriorate the barrier property. Further, if necessary, auxiliary chemicals such as a dispersant, a defoaming agent, a coloring agent, a water-proofing agent, and an antiseptic agent may be optionally added to obtain a coating material by a known adjustment method. There is no limitation on the coating equipment for the above-mentioned barrier layer coating liquid, and it can be arbitrarily selected from a size press, a gate roll coater, a bar coater, a roll coater, an air knife coater, a blade coater and the like. The coating amount is also not limited, but considering the quality and the price, the barrier layer formed on the base paper has an absolute dry weight of 0.5 to 20 g / m 2.
It is preferable to adjust so that about 2 coats are applied.

In the present invention, a coating material containing a pigment, a resin, and a lubricant may be applied in multiple layers on the base paper to form a barrier layer by applying the coating operation twice or more. Further, after applying the above coating composition, if necessary, it may be subjected to a smoothing treatment with a finishing equipment such as a super calender. By such a smoothing treatment, the surface quality of the obtained barrier layer becomes good, and the silicone The coating layer is particularly preferable because it can be formed uniformly. In this case, it is preferable to adjust the smoothness to a range of 20 to 5000 seconds (Oken type smoothness specified in JAPAN TAPPI Paper Pulp Test Method No. 5) depending on the purpose.

The release paper substrate thus obtained is
It has a sufficient silicone permeation suppression effect, and like high density base paper such as film laminated paper and glassine paper,
Since the films are not stuck and the raw material pulp is not beaten excessively, it is possible to collect and recycle the release paper and broke after use. A release agent such as a silicone resin is coated on the release paper substrate to obtain a release paper. As the silicone resin, solvent-diluted silicone that is diluted with an organic solvent such as toluene or hexane and applied, or solventless silicone that has an effective solid content of 100% can be used.

Among these silicones, solventless silicones are becoming the mainstream from the viewpoint of environmental protection in recent years. Solvent-free silicone is roughly classified into a thermosetting type, an electron beam curing type, and an ultraviolet curing type according to its curing method. Among these, the ultraviolet curable type is superior from the viewpoints of productivity, cost and space saving, and among them, the ultraviolet curable solventless silicone containing an epoxy group-containing organopolysiloxane as a main component utilizing a photocationic polymerization reaction. Is the most excellent and is particularly preferable.

[0044]

The base material for release paper manufactured according to the present invention has a barrier property comparable to that of a base material laminated with a film such as polyethylene, and the manufacturing cost is extremely low because the step of laminating the film is unnecessary. Has the advantage that Further, the release paper using the substrate of the present invention does not have a film laminating layer, and since the raw material pulp of the base paper is not excessively beaten like glassine paper, it is easily subjected to a recycling step after recovery. be able to.
In this recycling process, when the used release paper is put into water, the silicone layer and the barrier layer are detached from the base paper, so that only the pulp can be easily recovered and reused.

[0045]

The present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited by these examples. In the examples, "part" means "part by weight" unless otherwise specified.

Example 1-1 A base material for release paper was manufactured by the following steps. (1) Papermaking of base paper First, a paper stock having the following composition was prepared. Component Weight Softwood bleached kraft pulp (beating degree: 470 ml) 20 parts Hardwood bleaching kraft pulp (beating degree: 470 ml) 80 parts 50% talc dispersion 10 parts 30% Reinforced rosin sizing agent (trademark: SPE, manufactured by Arakawa Chemical Industries) ) 0.3 part 30% aluminum sulphate 2 parts Next, from this stock material, a basis weight of 65 g was obtained using a fourdrinier cylinder machine
/ M ² of base paper was produced. The Oken type smoothness of this base paper is 4
It was 5 seconds.

(2) Formation of Barrier Layer A barrier layer coating solution having the following composition was prepared. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyvinyl alcohol (trademark: PVA103, degree of polymerization 300, manufactured by Kuraray) 100 parts Acetylated starch (trademark: National 78-0338, National Starch and Chemicals) 5 parts) This coating solution has a dry weight of 4.5 g on one side of the above base paper.
It was coated with a gate roll coater so as to be / m ² and dried. Further, a base material for finish release paper was produced with a super calender for 240 seconds with Oken type smoothness.

A predetermined paper supply piece was prepared from the above release paper substrate, and its toluene penetration preventing effect, pinhole preventing effect,
The silicone penetration preventing effect and the disintegration property after silicone coating were evaluated by the following methods.

(1) Toluene permeation prevention effect and pinhole prevention effect An oil-soluble dye (trademark: Oleosol Red) is provided on a piece of paper.
B, manufactured by Sumitomo Chemical Co., Ltd.) and coated with toluene.
After a few seconds, wipe off with a gauze, the state of penetration of toluene on the surface,
And, the eye-stopping effect of pinholes generated in spots was determined.

(2) Silicon Penetration Prevention Effect (Solvent Diluting Type) A silicone coating solution having the following composition was prepared. Component Weight Thermosetting silicone (trademark: SD7220, manufactured by Toray) 4.5 parts Platinum catalyst (trademark: SRX212, manufactured by Toray) 0.5 part Toluene 95 parts The above silicone liquid is cut off by a Mayer bar on a piece of paper. Coating was performed so that the dry weight was 1.0 g / m ^2, and the obtained surface was observed to evaluate the penetration of silicone.

(3) Silicon Penetration Prevention Effect (Solventless Type) A silicone liquid having the following composition was prepared. Component weight Cationic polymerization UV-curable silicone (Trademark: UV9300, Toshiba Silicone) 100 parts Photocationic catalyst (Trademark: UV9310C, Toshiba Silicone) 3 parts The above silicone liquid is dried by a Mayer bar on an absolute dry weight. Of 1.0 g / m ² was applied, and the surface obtained was observed to evaluate the penetration of silicone.

(4) Disintegration property after silicone coating The release paper obtained in the above (2) was manufactured according to JIS P82.
It was subjected to a disintegration treatment by a standard disintegrator defined in No. 09, the dispersed state of the sample components was observed, and its disintegration property was evaluated. The results of each test are shown in Table 1.

Example 1-2 A release paper substrate was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyvinyl alcohol (trademark: KP08, degree of polymerization 800, manufactured by Nippon Synthetic Chemical Industry) 100 parts Phosphate esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 5 copies

Example 1-3 A base material for release paper was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component weight Polyvinyl alcohol (trademark: GL03, degree of polymerization 300, manufactured by Nippon Synthetic Chemical Industry) 100 parts Acetylated starch (trademark: National 78-0338, manufactured by National Starch and Chemicals) 5 parts

Example 1-4 A release paper substrate was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component Weight Polyvinyl alcohol (Trademark: GL03, degree of polymerization 300, manufactured by Nippon Synthetic Chemical Industry) 100 parts Polyolefin wax (Trademark: Slip Aid SL140, manufactured by San Nopco) 1 part

Example 1-5 A base material for release paper was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component Weight Polyvinyl alcohol (trademark: NH-17Q, degree of polymerization 1700, manufactured by Nippon Synthetic Chemical Industry) 100 parts Polyolefin wax (trademark: Slip-Aid SL140, manufactured by San Nopco) 1 part

Comparative Example 1-1 On the base paper of Example 1-1, melted low density polyethylene (manufactured by Sumitomo Chemical Co., Ltd.) was laminated by a melt extruder to prepare a base material for release paper, and its evaluation test was conducted. went. As a result of observing the section of this laminated paper with a scanning electron microscope, the thickness of the polyethylene film layer was about 18 microns. The test results are shown in Table 1.

Comparative Example 1-2 A release paper substrate was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyvinyl alcohol (trademark: KM11, degree of polymerization 1100, manufactured by Nippon Synthetic Chemical Industry) 100 parts Phosphate esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 5 copies

Comparative Example 1-3 A release paper substrate was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyvinyl alcohol (trademark: SKR10H, degree of polymerization 250, manufactured by Shin-Etsu Chemical) 100 parts Oxidized starch (trademark: manufactured by Prince Ace A, manufactured by Oji Cornstarch) 5 parts

Comparative Example 1-4 A base material for release paper was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component Weight Polyvinyl alcohol (trademark: KM11, degree of polymerization 1100, manufactured by Nippon Synthetic Chemical Industry) 100 parts Phosphate esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical Co., Ltd.) 5 parts

Comparative Example 1-5 A release paper substrate was prepared in the same manner as in Example 1-1, and its evaluation test was conducted. However, a coating material having the following composition was used in place of the barrier layer coating liquid of Example 1-1. The test results are shown in Table 1. Component Weight Polyvinyl alcohol (Trademark: PVA103, degree of polymerization 300, made by Kuraray) 100 parts

Example 2-1 (1) Papermaking of base paper A base paper was produced in the same manner as in Example 1-1. (2) Formation of Barrier Layer A coating liquid for barrier layer having the following composition was prepared. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Styrene butadiene copolymer latex (trademark: JSR0624, glass transition temperature -14 ° C, manufactured by Japan Synthetic Rubber) 15 parts Phosphorus esterified starch (trademark: (Neil gum A85, manufactured by Matsutani Chemical Co., Ltd.) 10 parts.
It was coated with a blade coater so as to be g / m ² and dried. Furthermore, by super calendar, Oken type smoothness 44
A base material for finish release paper was produced at 0 seconds.

A predetermined paper supply piece was prepared from the above release paper substrate, and its toluene penetration preventing effect, pinhole preventing effect,
The silicone penetration preventing effect and the disintegration property after silicone coating were evaluated in the same manner as in Example 1-1.

Example 2-2 A release paper substrate was prepared in the same manner as in Example 2-1, and the evaluation test was conducted. However, a paint having the following composition was used instead of the barrier layer coating liquid of Example 2-1. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Styrene butadiene copolymer latex (trademark: JSR0691, glass transition temperature -5 ° C, made by Japan Synthetic Rubber) 15 parts Phosphorylated starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 10 parts

Example 2-3 A release paper substrate was prepared in the same manner as in Example 2-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the barrier layer coating liquid of Example 2-1. The test results are shown in Table 2. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Styrene butadiene copolymer latex (trademark: JSR0624, glass transition temperature -14 ° C, made by Japan Synthetic Rubber) 15 parts Acetylated starch (trademark: National 78 -0338, made by National Starch and Chemicals) 10 parts

Example 2-4 A release paper substrate was prepared in the same manner as in Example 2-1, and the evaluation test was conducted. However, the following lubricant was added to the coating liquid for barrier layer of Example 2-1. Component Weight Polyolefin wax (Trademark: SlipAid SL140, San Nopco) 1 part

Comparative Example 2-1 On the base paper of Example 2-1, melted low density polyethylene (manufactured by Sumitomo Chemical Co., Ltd.) was laminated by a melt extruder to prepare a release paper substrate, and the evaluation test was conducted. went. As a result of observing the section of this laminated paper with a scanning electron microscope, the thickness of the polyethylene film layer was about 18 microns. The test results are shown in Table 2.

Comparative Example 2-2 A base material for release paper was prepared in the same manner as in Example 2-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the barrier layer coating liquid of Example 2-1. The test results are shown in Table 1. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Styrene butadiene copolymer latex emulsion (trademark: JSR0610, glass transition temperature 0 ° C., made by Japan Synthetic Rubber) 15 parts Phosphorylated starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 10 parts

Comparative Example 2-3 A base material for release paper was prepared in the same manner as in Example 2-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the barrier layer coating liquid of Example 2-1. The test results are shown in Table 2. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Styrene butadiene copolymer latex (trademark: JSR0615, glass transition temperature -16 ° C, made by Japan Synthetic Rubber) 15 parts Phosphorylated starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 10 parts

Example 3-1 (1) Papermaking of base paper A base paper was produced in the same manner as in Example 1-1. (2) Formation of Barrier Layer A coating liquid for barrier layer having the following composition was prepared. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyacrylamide-acrylic acid ester copolymer (trademark: HSB260, manufactured by Sanyo Kasei Co., Ltd.) 15 parts Phosphoesterified starch (trademark: Neil gum A85, Matsutani) 10 parts by weight of this coating liquid on one side of the above base paper in a dry weight of 15.0.
It was coated with a blade coater so as to be g / m ² and dried. Furthermore, with super calendar, it is 8 in Oken type smoothness
A base material for finish release paper was produced in 10 seconds.

A predetermined paper supply piece was prepared from the above release paper substrate, and its toluene penetration preventing effect, pinhole preventing effect,
The silicone penetration preventing effect and the disintegration property after silicone coating were evaluated in the same manner as in Example 1-1. The test results are shown in Table 3.

Example 3-2 A release paper substrate was prepared in the same manner as in Example 3-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the coating liquid for barrier layer of Example 3-1. The test results are shown in Table 3. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyacrylamide-acrylic acid ester copolymer (trademark: HSB2450, manufactured by Sanyo Chemical Industries) 15 parts Phosphate esterified starch (trademark: Neil gum A85, Matsutani) 10)

Example 3-3 A release paper substrate was prepared in the same manner as in Example 3-1, and its evaluation test was conducted. However, the following lubricant was added in place of the barrier layer coating liquid of Example 3-1. The test results are shown in Table 3. Component Weight Polyolefin wax (Trademark: SlipAid SL140, San Nopco) 1 part

Comparative Example 3-1 Molten low-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd.) was laminated on the base paper of Example 3-1 by a melt extruder to prepare a base material for release paper, and its evaluation test was conducted. went. As a result of observing the section of this laminated paper with a scanning electron microscope, the thickness of the polyethylene film layer was about 18 microns. The test results are shown in Table 3.

Comparative Example 3-2 A base material for release paper was prepared in the same manner as in Example 3-1, and its evaluation test was conducted. However, a paint having the following composition was used in place of the barrier layer coating liquid of Example 3-1. The test results are shown in Table 3. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polyacrylamide resin (trademark: Polystron 191, manufactured by Arakawa Chemical Industry) 15 parts Phosphate esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 10 Department

Comparative Example 3-3 A base material for release paper was prepared in the same manner as in Example 3-1, and its evaluation test was conducted. However, a paint having the following composition was used in place of the barrier layer coating liquid of Example 3-1. The test results are shown in Table 3. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Acrylic ester polymer (trademark: AP8100, manufactured by Shin-Nakamura Chemical) 15 parts Phosphate esterified starch (trademark: Neil gum A85, manufactured by Matsutani Chemical) 10 Department

Example 4-1 (1) Papermaking of base paper A base paper was produced in the same manner as in Example 1-1. (2) Formation of Barrier Layer A coating liquid for barrier layer having the following composition was prepared. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer (trademark: “PAE21”, manufactured by Arakawa Chemical Industry Co., Ltd.) 25 parts 10.0 dry weight on one side of the above base paper
It was coated with a bar coater so as to be g / m ² and dried.
In addition, the super calender gives 815 Oken type smoothness.
In seconds, a base material for finish release paper was produced.

A predetermined paper supply piece was prepared from the above-mentioned release paper substrate, and its toluene penetration preventing effect, pinhole preventing effect,
The silicone penetration preventing effect and the disintegration property after silicone coating were evaluated in the same manner as in Example 1-1. The test results are shown in Table 4.

Example 4-2 A release paper substrate was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, instead of the coating liquid for barrier layer of Example 4-1, a coating material having the following composition was used. The test results are shown in Table 4. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer (trademark: PAE24, manufactured by Arakawa Chemical Industries) 15 parts Acetylated starch (trademark: National 78 -0338, made by National Starch and Chemicals) 10 parts

Example 4-3 A release paper substrate was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, instead of the coating liquid for barrier layer of Example 4-1, a coating material having the following composition was used. The test results are shown in Table 4. Component Weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer (trademark: PAE25, manufactured by Arakawa Chemical Industries) 25 parts

Example 4-4 A release paper substrate was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, instead of the coating liquid for barrier layer of Example 4-1, a coating material having the following composition was used. The test results are shown in Table 4. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer (trademark: PAE24, manufactured by Arakawa Chemical Industries) 15 parts Acetylated starch (trademark: National 78 -0338, National Starch and Chemicals) 10 parts

Example 4-5 A release paper substrate was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, the following lubricant was added to the barrier layer coating liquid of Example 4-1. The test results are shown in Table 4. Component Weight Polyolefin wax (Trademark: SlipAid SL140, San Nopco) 1 part

Comparative Example 4-1 Molten low-density polyethylene (manufactured by Sumitomo Chemical Co., Ltd.) was laminated on the base paper of Example 4-1 by a melt extruder to prepare a base material for release paper, and its evaluation test was conducted. went. As a result of observing the cross section of this laminated paper with a scanning electron microscope, the thickness of the polyethylene film layer was about 18 μm. The test results are shown in Table 4.

Comparative Example 4-2 A base material for release paper was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the coating liquid for barrier layer of Example 4-1. The test results are shown in Table 4. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Acrylic ester polymer (trademark: AP8100, manufactured by Shin-Nakamura Chemical) 25 parts

Comparative Example 4-3 A release paper substrate was prepared in the same manner as in Example 4-1, and its evaluation test was conducted. However, a paint having the following composition was used instead of the coating liquid for barrier layer of Example 4-1. The test results are shown in Table 4. Component weight Kaolin (trademark: HT clay, manufactured by Engelhard) 100 parts Polystyrene polymer (trademark: L8801, manufactured by Asahi Kasei Corporation) 25 parts

[0086]

[Table 1]

[0087]

[Table 2]

[0088]

[Table 3]

[0089]

[Table 4] As is clear from Tables 1 to 4, the release paper base materials of the respective examples according to the present invention have obtained satisfactory results, but the release paper base materials of the respective comparative examples have some properties. Was dissatisfied with.

[0090]

The base material for release paper manufactured according to the present invention has a barrier property comparable to that of a base material laminated with a film such as polyethylene, and the manufacturing process is unnecessary because the step of laminating the film is unnecessary. It has the advantage of being extremely cheap. Further, the release paper using the base material of the present invention does not have a film laminate layer, and since the raw material pulp of the base paper is not excessively beaten like glassine paper, it is easily subjected to a recycling step after recovery. be able to.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // B32B 27/00 L 9349-4F (72) Inventor Masahiro Toganehara 1-chome Shinonome, Koto-ku, Tokyo No. 10-6 Shin-Oji Paper Co., Ltd. Tokyo Commodity Research Institute

Claims (10)

[Claims] 1. A polyacrylamide-acrylic acid ester copolymer, a styrene-butadiene copolymer latex having a glass transition temperature in the range of −5 ° C. to −15 ° C., and polystyrene on a base paper mainly made of wood pulp. -Acrylic ester polymer-A release paper substrate having a barrier layer containing one or more resins selected from polyvinyl alcohol copolymers. 2. The base material for release paper according to claim 1, wherein the barrier layer contains a pigment. 3. The release paper substrate according to claim 2, wherein the pigment in the barrier layer is a plate-like pigment. 4. The release paper substrate according to claim 1, wherein the barrier layer contains one or more selected from phosphoric esterified starch and acetylated starch as an adhesive. . 5. The barrier layer contains a polyolefin wax as a lubricant,
The base material for release paper according to 2, 3, or 4. 6. A base paper containing wood pulp as a main raw material, and a barrier layer containing polyvinyl alcohol having a degree of polymerization of 200 to 2000 on the base paper, wherein the barrier layer further contains a polyolefin wax as a lubricant. Characteristic base material for release paper. 7. A base paper containing wood pulp as a main raw material, and having a barrier layer containing polyvinyl alcohol having a degree of polymerization of 200 to 800, the barrier layer further comprising phosphate esterified starch, and And / or acetylated starch is contained in the release paper substrate. 8. The base material for release paper according to claim 7, wherein the barrier layer contains a polyolefin wax as a lubricant. 9. A release paper having a release agent layer on the barrier layer of the release paper substrate according to any one of claims 1 to 8. 10. The release paper according to claim 9, wherein the release agent layer is a layer formed of an ultraviolet curable solventless silicone resin containing an epoxy group-containing organopolysiloxane as a main component.