JP5230500B2 - Process release paper - Google Patents
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- JP5230500B2 JP5230500B2 JP2009075828A JP2009075828A JP5230500B2 JP 5230500 B2 JP5230500 B2 JP 5230500B2 JP 2009075828 A JP2009075828 A JP 2009075828A JP 2009075828 A JP2009075828 A JP 2009075828A JP 5230500 B2 JP5230500 B2 JP 5230500B2
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Landscapes
- Paper (AREA)
Description
本発明は、工程剥離紙に関する。より詳しくは、ウレタンフィルム研磨布を構成する基材とポリウレタンフィルムを貼り合わせる粘着層を形成するために用いる工程剥離紙に関するものである。 The present invention relates to a process release paper. More specifically, the present invention relates to a process release paper used for forming an adhesive layer that bonds a base material constituting a urethane film polishing cloth and a polyurethane film.
剥離紙は一般に、接着シートの剥離紙（接着テープやラベルなど）、産業用基材（例えば、マーキングシート、金属箔等の剥離紙など）、包装用紙（例えば、紙袋、ブックカバーなど）、工程剥離紙（例えば、合成皮革、プリプレグ、プラスチックフィルム等の工程剥離紙）などとして多用されている。 Release paper is generally adhesive sheet release paper (adhesive tape, label, etc.), industrial base material (eg, marking sheet, release paper such as metal foil), packaging paper (eg, paper bag, book cover, etc.), process It is frequently used as release paper (for example, process release paper such as synthetic leather, prepreg, and plastic film).
中でも工程剥離紙は、目的製品を得るための使用用途別に異なる性能が必要とされている。 Among them, the process release paper is required to have different performances depending on the usage for obtaining the target product.
ウレタンフィルム研磨布を構成する基材とポリウレタンフィルムを貼り合わせる粘着層を形成するために用いる工程剥離紙は、特に表面性と剥離性に優れた工程剥離紙が必要とされる。ウレタンフィルム研磨布は、レンズ、平行平面板、反射ミラー等の光学材料、ハードディスク用基板、シリコンウエハ、液晶ガラス等、高精度に平坦性が要求される材料の平坦加工用の研磨布の材料として使用されており、その構造は、フィルム等の基材上に、多孔質構造を有するポリウレタンを、粘着剤からなる粘着層を設けて貼り合わせたものである（特許文献１、特許文献２を参照）。粘着層は、工程剥離紙上に粘着剤を塗布して形成され、この粘着層をポリウレタンフィルム上にフィルム転写した後、基材と貼り合わせる方法が用いられている。粘着層を設けるために工程剥離紙には、加熱に対する耐熱性や、粘着剤を均一に転写するための寸法安定性および強度（引張強度、引裂強度）が求められている。 The process release paper used for forming the pressure-sensitive adhesive layer that bonds the base material constituting the urethane film polishing cloth and the polyurethane film requires a process release paper particularly excellent in surface properties and releasability. Urethane film polishing cloth is used as a polishing cloth material for flat processing of optical materials such as lenses, parallel flat plates, reflecting mirrors, hard disk substrates, silicon wafers, liquid crystal glass, etc. that require flatness with high accuracy. The structure is a structure in which polyurethane having a porous structure is provided on a base material such as a film, and an adhesive layer made of an adhesive is provided (see Patent Document 1 and Patent Document 2). ). The pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive on the process release paper, and this adhesive layer is transferred onto a polyurethane film and then bonded to a substrate. In order to provide an adhesive layer, the process release paper is required to have heat resistance against heating and dimensional stability and strength (tensile strength, tear strength) for uniformly transferring the adhesive.
工程剥離紙には、ポリエチレンラミネートした基材上に、剥離性を付与するための剥離剤としてシリコーンを塗布したものが用いられている。シリコーンの種類は、有機溶剤に分散させた溶剤性シリコーン、水に分散・乳化させた水性シリコーン、無溶剤性シリコーンの３種類がある。剥離紙や工程紙の用途には、従来から均一な塗工層を有し、良好な剥離性が得られる溶剤性シリコーンが使用されていたが、昨今の環境問題に対する意識の高さから、有機溶媒を使用せず環境負荷の少ない水性シリコーンを使用した工程剥離紙に対する要望が大きくなってきており、水性シリコーンを使用した剥離紙に関する技術も開示されている（特許文献３を参照）。 As the process release paper, a polyethylene-coated base material in which silicone is applied as a release agent for imparting peelability is used. There are three types of silicones: a solvent-based silicone dispersed in an organic solvent, an aqueous silicone dispersed / emulsified in water, and a solventless silicone. Solvent silicone, which has a uniform coating layer and has good release properties, has been used for applications such as release paper and process paper. There has been a growing demand for process release papers that use aqueous silicone that does not use a solvent and has a low environmental impact, and a technique relating to release papers that uses aqueous silicone is also disclosed (see Patent Document 3).
一方で、工程剥離紙の剥離剤として水性シリコーンを用いた場合、基紙が非塗工紙であれば、シリコーンが基紙に沈み込むため、一定期間放置後すると製造直後より剥離性が大幅に低下する問題がある。このため、基紙に水溶性高分子からなる目止め層を設けた後に剥離剤を塗工する技術が開示されている（特許文献３を参照）。 On the other hand, when water-based silicone is used as the release agent for the process release paper, if the base paper is uncoated paper, the silicone sinks into the base paper. There is a problem that decreases. For this reason, a technique is disclosed in which a release agent is applied after a sealing layer made of a water-soluble polymer is provided on a base paper (see Patent Document 3).
上記技術を使用することで、水性シリコーンを用いた工程剥離紙を得ることはできるが、しかしながら、例えばポリウレタンフィルムを基材に粘着させる用途に用いる等、強い粘着性を有する粘着層を形成するための工程剥離紙として使用する場合は、充分な耐熱性、寸法安定性および強度（引張強度、引裂強度）が得られない問題がある。特にウレタンフィルム研磨布の場合は、研磨用途のため表面が均一でなくてはならず、粘着層においても均一な層を形成し、かつ、均一にポリウレタンフィルムへ転写する必要がある。 By using the above technique, it is possible to obtain a process release paper using aqueous silicone. However, in order to form a pressure-sensitive adhesive layer having strong adhesion, for example, for use in adhering a polyurethane film to a substrate. When used as a release paper, there is a problem that sufficient heat resistance, dimensional stability and strength (tensile strength, tear strength) cannot be obtained. In particular, in the case of a urethane film polishing cloth, the surface must be uniform for the purpose of polishing, and it is necessary to form a uniform layer in the adhesive layer and transfer it uniformly to the polyurethane film.
均一な粘着層が形成でき、かつ高い転写性を得るためには、より平坦性に優れる剥離層が必要となる。剥離層の平坦性を向上させるためには目止め層の平坦性を向上させる必要があり、例えば無機顔料からなる目止め層の上に水性シリコーンを塗工することが考えられる。しかしながら無機顔料の上に水性シリコーンを塗布すると、目止め層表面の無機顔料が水性シリコーンと親和性が低く水性シリコーンを弾くため、均一な剥離層が得られない問題があり、均一な転写性を有する工程剥離紙を得ることができなかった。 In order to form a uniform pressure-sensitive adhesive layer and to obtain high transferability, a release layer with better flatness is required. In order to improve the flatness of the release layer, it is necessary to improve the flatness of the sealing layer. For example, it is conceivable to apply aqueous silicone on the sealing layer made of an inorganic pigment. However, when aqueous silicone is applied on the inorganic pigment, the inorganic pigment on the surface of the filler layer has a low affinity with the aqueous silicone and repels the aqueous silicone. It was not possible to obtain a process release paper.
特に無機顔料として平坦性に優れた、板状顔料であるカオリンクレーを用いた場合には、水性シリコーンがカオリンクレーとなじまず、目止め層が水性シリコーンを弾いて塗工ムラが発生し、実用に耐え得る剥離層が得られない問題がある。 In particular, when kaolin clay, which is a plate-like pigment with excellent flatness as an inorganic pigment, is used, water-based silicone does not match kaolin clay, and the sealing layer repels water-based silicone, causing coating unevenness and practical use. There is a problem that a release layer that can withstand the above cannot be obtained.
上述のごとく、無機顔料、特にカオリンクレーを有する目止め層上には、水性シリコーンを均一に塗工することができなかった。このため、均一に粘着剤を塗布することができず、水性シリコーンを塗布した工程剥離紙において、均一な粘着層が形成でき、かつ高い転写性が得られる工程剥離紙は、いまだ得られていなかった。 As described above, the aqueous silicone could not be uniformly applied onto the filler layer having an inorganic pigment, particularly kaolin clay. For this reason, the pressure-sensitive adhesive cannot be applied uniformly, and a process release paper that can form a uniform pressure-sensitive adhesive layer and can provide high transferability has not yet been obtained. It was.
本発明の課題は、ウレタンフィルム研磨布においてポリウレタンフィルム又は基材の表面に粘着層を転写形成し、ポリウレタンフィルムと基材とを粘着するための工程剥離紙であり、剥離剤である水性シリコーンを基紙上に均一に塗工できるため均一な剥離層を形成でき、剥離層上に表面に均一な粘着層が形成でき、かつポリウレタンフィルムへの前記粘着層の転写性が高く、充分な耐熱性を有する工程剥離紙を提供することである。更には、優れた寸法安定性および強度（引張強度、引裂強度）を有する工程剥離紙を提供することである。 An object of the present invention is a process release paper for transferring an adhesive layer on the surface of a polyurethane film or a substrate in a urethane film polishing cloth to adhere the polyurethane film and the substrate, and an aqueous silicone as a release agent. A uniform release layer can be formed because it can be applied uniformly on the base paper, a uniform adhesive layer can be formed on the surface of the release layer, and the adhesive layer can be transferred to a polyurethane film with high heat resistance. It is to provide a process release paper having. Furthermore, it is providing the process release paper which has the outstanding dimensional stability and intensity | strength (tensile strength, tear strength).
本発明の工程剥離紙は、ウレタンフィルム研磨布等の粘着性フィルムにおいてポリウレタンフィルムと基材との間に配置され両者を粘着するための粘着層を、表面に形成し、ポリウレタンフィルム又は基材に転写するために使用される工程剥離紙であって、基紙と、前記基紙上に設けられた目止め層と、前記目止め層上に設けられた剥離層とからなり、前記目止め層が顔料及び粘着剤を主成分とする塗工層であり、前記剥離層が、水性シリコーン及びポリビニルアルコールを含有し、前記ポリビニルアルコールの含有割合が、乾燥質量で前記水性シリコーン１００質量部に対して、３０〜５０質量部であることを特徴とする。 The process release paper of the present invention is a pressure-sensitive adhesive film such as a urethane film polishing cloth, which is disposed between a polyurethane film and a base material and forms an adhesive layer on the surface to adhere both to the polyurethane film or base material. A process release paper used for transferring, comprising a base paper, a sealing layer provided on the base paper, and a release layer provided on the sealing layer, wherein the sealing layer is It is a coating layer mainly composed of a pigment and a pressure-sensitive adhesive, the release layer contains aqueous silicone and polyvinyl alcohol, and the content ratio of the polyvinyl alcohol is 100 parts by mass of the aqueous silicone in dry mass. 30-50 parts by mass.
本発明の工程剥離紙は、製造時に、無機顔料を含む目止め塗工層が水性シリコーンを弾く問題がなく、ウレタンフィルム研磨布等のポリウレタンフィルムと基材との間に配置され両者を粘着するための粘着層の形成及び転写に用いられる工程剥離紙であり、表面に均一な粘着層が形成でき、かつポリウレタンフィルムへの前記粘着層の転写性が高く、充分な耐熱性、優れた寸法安定性および強度（引張強度、引裂強度）を有している。また、古紙原料としてリサイクルが容易である。 The process release paper of the present invention has no problem that the sealing coating layer containing an inorganic pigment repels water-based silicone at the time of production, and is disposed between a polyurethane film such as a urethane film polishing cloth and a substrate and adheres to both. It is a process release paper used for the formation and transfer of the adhesive layer for forming a uniform adhesive layer on the surface, the transferability of the adhesive layer to the polyurethane film is high, sufficient heat resistance, and excellent dimensional stability Property and strength (tensile strength, tear strength). Moreover, it can be easily recycled as a raw paper raw material.
以下、本発明について実施形態を示して詳細に説明するが、本発明はこれらの記載に限定して解釈されない。 Hereinafter, although an embodiment is shown and explained in detail about the present invention, the present invention is limited to these descriptions and is not interpreted.
本発明の工程剥離紙１０は、図１に示すように、基紙１１と、基紙１１上に設けられた目止め層１２と、目止め層１２上に設けられた剥離層１３とからなり、目止め層１２が顔料及び接着剤を主成分とする塗工層であり、剥離層１３が、水性シリコーン及びポリビニルアルコールを含有する。 As shown in FIG. 1, the process release paper 10 of the present invention comprises a base paper 11, a sealing layer 12 provided on the base paper 11, and a release layer 13 provided on the sealing layer 12. The sealing layer 12 is a coating layer mainly composed of a pigment and an adhesive, and the release layer 13 contains aqueous silicone and polyvinyl alcohol.
目止め層１２及び剥離層１３は、図１では基紙の片面のみに設けているが、両面に設けてもよい。 The sealing layer 12 and the release layer 13 are provided on only one side of the base paper in FIG. 1, but may be provided on both sides.
＜基紙＞
基紙の材料としては特に限定されず、通常製紙用途として用いる原料パルプを使用することができる。例えば、未晒針葉樹パルプ（ＮＵＫＰ）、未晒広葉樹パルプ（ＬＵＫＰ）、晒針葉樹パルプ（ＮＢＫＰ）、晒広葉樹パルプ（ＬＢＫＰ）等の化学パルプ；ストーングランドパルプ（ＳＧＰ）、加圧ストーングランドパルプ（ＰＧＷ）、リファイナーグランドパルプ（ＲＧＰ）、ケミグランドパルプ（ＣＧＰ）、サーモグランドパルプ（ＴＧＰ）、グランドパルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）、リファイナーメカニカルパルプ（ＲＭＰ）等の機械パルプ等を使用することができる。また、古紙からなる古紙パルプを使用することも可能であり、例えば、雑誌古紙、チラシ古紙、オフィス古紙等から製造される離解・脱墨古紙パルプ、離解・脱墨・漂白古紙パルプ等があげられる。本発明では、これらの中から１種又は２種以上を適宜選択して使用することができる。
<Base paper>
The material of the base paper is not particularly limited, and raw material pulp that is usually used for papermaking can be used. For example, chemical pulp such as unbleached softwood pulp (NUKP), unbleached hardwood pulp (LUKP), bleached softwood pulp (NBKP), bleached hardwood pulp (LBKP); stone grand pulp (SGP), pressurized stone grand pulp (PGW) ), Refiner ground pulp (RGP), chemi ground pulp (CGP), thermo ground pulp (TGP), ground pulp (GP), thermo mechanical pulp (TMP), chemi thermo mechanical pulp (CTMP), refiner mechanical pulp (RMP) Mechanical pulp such as can be used. It is also possible to use waste paper pulp made of waste paper, such as disaggregation / deinking waste paper pulp, disaggregation / deinking / bleached waste paper pulp, etc. produced from magazine waste paper, flyer waste paper, office waste paper, etc. . In the present invention, one or more of these can be appropriately selected and used.
本実施形態においては、以上の原料パルプを混合して抄紙原料（紙料スラリー）を調製するが、当該原料パルプには、例えば、内添サイズ剤、紙力増強剤、紙厚向上剤、歩留向上剤等の通常の製紙工程で配合される種々の添加剤を、その種類及び配合量を適宜調整して内添することができる。 In the present embodiment, the above raw material pulp is mixed to prepare a papermaking raw material (stock slurry). For the raw material pulp, for example, an internal sizing agent, a paper strength enhancer, a paper thickness improver, a step Various additives blended in a normal papermaking process such as a retention improver can be internally added by appropriately adjusting the kind and blending amount thereof.
また、基紙を抄造する抄紙機も特に限定されず、例えば、長網方式、ツインワイヤー方式、ギャップフォーマー方式、丸網方式など各方式を適宜用いることができる。また、平滑度を高め、剥離強度を安定化させるために、ヤンキードライヤーやカレンダーなどの平滑化処理を行うことが好ましい。 Also, the paper machine for making the base paper is not particularly limited, and various systems such as a long net system, a twin wire system, a gap former system, and a round net system can be used as appropriate. In order to increase the smoothness and stabilize the peel strength, it is preferable to perform a smoothing process such as a Yankee dryer or a calendar.
基紙の米坪は特に限定されないが、粘着層の形成および転写工程において、シワ入りや波打ちによる粘着層の不均一化を防止し、かつ均一な転写性を得るためには適度な剛度が必要とされ、好ましくは紙流れ方向のテーパー剛度で０．４〜１．２ｍＮ・ｍ、より好ましくは０．５〜１．０ｍＮ・ｍである。テーパー剛度は基紙の米坪で調整でき、米坪は好ましくは１００〜１６０ｇ／ｍ２、より好ましくは１１０〜１４０ｇ／ｍ２である。米坪が１００ｇ／ｍ２を下回ると、テーパー剛度が０．４ｍＮ・ｍを下回る可能性が大きく、シワ入りや波打ちが発生しやすく耐熱性に劣る。米坪が１６０ｇ／ｍ２を超過すると、テーパー剛度が１．２ｍＮ・ｍを超過しやすくなり、シワ入りや波打ちは発生しないが、工程剥離紙に巻きくせが付いて均一な転写性が得られなくなり、作業性が低下するため好ましくない。但し、上記米坪の範囲内であっても、例えばポリエチレンラミネート等の加工を施すと剛性が失われやすく、上記テーパー剛度の範囲から外れる可能性があり、シワ入りや波打ちが発生しやすいため注意が必要である。 The base weight of the base paper is not particularly limited, but in the formation and transfer process of the adhesive layer, moderate rigidity is required to prevent unevenness of the adhesive layer due to wrinkles and undulations and to obtain uniform transferability The taper stiffness in the paper flow direction is preferably 0.4 to 1.2 mN · m, more preferably 0.5 to 1.0 mN · m. The taper stiffness can be adjusted by the basis weight of the base paper, and the basis weight is preferably 100 to 160 g / m 2 , more preferably 110 to 140 g / m 2 . When the rice tsubo is less than 100 g / m 2 , the taper stiffness is likely to be less than 0.4 mN · m, and wrinkles and undulations are likely to occur, resulting in poor heat resistance. When the weight per square meter exceeds 160 g / m 2 , the taper stiffness is likely to exceed 1.2 mN · m, and wrinkles and undulations do not occur. This is not preferable because workability is reduced. However, even if it is within the range of the above-mentioned rice square, for example, if processing such as polyethylene laminate is performed, rigidity is easily lost, and there is a possibility that it falls out of the range of the taper rigidity, so wrinkles and undulations are likely to occur. is necessary.
繰り返し使用しても断紙が発生しない工程剥離紙とするためには、一定以上の引張強度および引裂強度を有することが好ましい。引張強度は５ｋＮ／ｍ以上が好ましく、７ｋＮ／ｍ以上であると更に好ましい。引裂強度も同様に５００ｍＮ以上が好ましく、７００ｍＮ以上であると更に好ましい。上述のとおり、米坪が１００〜１６０ｇ／ｍ２、より好ましくは１１０〜１４０ｇ／ｍ２であれば、引張強度や引裂強度が上記範囲内となるため問題になりにくい。 In order to obtain a process release paper that does not generate a paper break even when it is repeatedly used, it is preferable to have a tensile strength and a tear strength of a certain level or more. The tensile strength is preferably 5 kN / m or more, and more preferably 7 kN / m or more. Similarly, the tear strength is preferably 500 mN or more, and more preferably 700 mN or more. As described above, when the basis weight is 100 to 160 g / m 2 , more preferably 110 to 140 g / m 2 , the tensile strength and the tear strength are within the above ranges, so that it is difficult to cause a problem.
＜目止め層＞
（顔料）
本発明においては、基紙上に剥離層を設ける前に、目止め層を設ける必要がある。本発明では、目止め層として、顔料及び接着剤を主成分とする顔料塗工層を使用する。顔料塗工層は、従来から使用されているラミネート層と比べて再資源化が容易であるとともに、基紙の平坦性を向上させる効果が大きく、均一な粘着層を形成でき、かつ粘着層をポリウレタンフィルムに均一に転写することができる。一方、目止め層が水溶性高分子からなるクリア塗工層では、基紙の平坦性を向上させる効果に劣り、均一な粘着層の形成および転写性を得ることができず、また、非水溶性樹脂層やラミネート層では、使用済み工程剥離紙を水中で離解しにくく、紙原料として再生しにくいため好ましくない。
<Seamless layer>
(Pigment)
In the present invention, it is necessary to provide a sealing layer before providing the release layer on the base paper. In the present invention, a pigment coating layer mainly composed of a pigment and an adhesive is used as the sealing layer. The pigment coating layer is easier to recycle than the conventionally used laminate layer, has a large effect of improving the flatness of the base paper, and can form a uniform adhesive layer. It can be uniformly transferred to a polyurethane film. On the other hand, the clear coating layer in which the sealing layer is made of a water-soluble polymer is inferior in the effect of improving the flatness of the base paper, cannot form a uniform adhesive layer and transferability, In the case of the conductive resin layer and the laminate layer, it is not preferable because the used process release paper is not easily disaggregated in water and is not easily regenerated as a paper raw material.
顔料としては特に限定されず、従来から抄紙用途で使用している顔料を用いることができる。例えば、炭酸カルシウム（重質、軽質）、クレー（パイロフィライトクレー、カオリンクレー、ハロイサイトクレー、ろう石クレー等）、タルク、二酸化チタン、酸化亜鉛、酸化珪素、非晶質シリカ、炭酸マグネシウム、炭酸バリウム、水酸化アルミニウム、アルミナ、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛等が挙げられ、必要に応じて１種類以上を組み合わせて使用することができる。この中でも、目止め層表面を平坦化する効果の高いクレー、特にカオリンクレーを用いると、得られる工程剥離紙の表面性が向上するため好ましい。 The pigment is not particularly limited, and a pigment conventionally used for papermaking can be used. For example, calcium carbonate (heavy, light), clay (pyrophyllite clay, kaolin clay, halloysite clay, wax stone clay, etc.), talc, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, magnesium carbonate, carbonic acid Examples thereof include barium, aluminum hydroxide, alumina, calcium hydroxide, magnesium hydroxide, and zinc hydroxide, and one or more kinds can be used in combination as necessary. Among these, it is preferable to use clay, particularly kaolin clay, which has a high effect of flattening the surface of the sealing layer, because the surface properties of the resulting process release paper are improved.
特に、目止め層の顔料のうち７０〜１００質量％がクレーであることが好ましい。クレーが７０質量％未満であると、目止め層表面が平坦化されにくく、均一な粘着層が得られないだけでなく、粘着層がポリウレタンフィルムに均一に転写しにくいため好ましくない。 In particular, it is preferable that 70 to 100% by mass of the pigment of the filler layer is clay. If the clay is less than 70% by mass, the surface of the sealing layer is not easily flattened, and not only a uniform adhesive layer is not obtained, but also the adhesive layer is not easily transferred to the polyurethane film, which is not preferable.
クレーの形状としては、従来一般に製紙用途で使用するものを使用できる。例えば大粒径クレー、微粒クレー、焼成クレー、高白色クレー等が挙げられる。この中でも粒子径０．３〜０．８μｍの粒子が全体の７０％以上、より好ましくは８０％以上を占めるクレーを用いると、目止め層のカバーリングが良いため高平滑な表面を有する目止め層が得られやすく、均一な粘着層および転写性が得られやすいため好ましい。０．３μｍ未満の粒子が多くなり０．３〜０．８μｍの粒子が全体の７０％を下回ると、均一な粘着層が得られやすいものの粘着剤の転写性が低下しやすいため好ましくない。逆に０．８μｍを超過する粒子が多く０．３〜０．８μｍの粒子が全体の７０％を下回ると、均一な目止め層表面が得られにくく、強い平坦化条件が必要となり、工程剥離紙の強度（引張強度、引裂強度）が低下しやすくなるため好ましくない。 As the shape of the clay, those conventionally used for papermaking can be used. For example, large particle size clay, fine particle clay, calcined clay, high white clay and the like can be mentioned. Among these, when a clay in which particles having a particle diameter of 0.3 to 0.8 μm occupy 70% or more of the whole, more preferably 80% or more is used, the sealing having a highly smooth surface is obtained because the covering of the sealing layer is good. It is preferable because a layer is easily obtained and a uniform adhesive layer and transferability are easily obtained. When the number of particles of less than 0.3 μm increases and the number of particles of 0.3 to 0.8 μm is less than 70% of the whole, a uniform adhesive layer is easily obtained, but the transferability of the adhesive is liable to decrease, which is not preferable. On the contrary, if there are many particles exceeding 0.8 μm and particles of 0.3 to 0.8 μm are less than 70% of the whole, it is difficult to obtain a uniform sealing layer surface, and a strong flattening condition is required, and process peeling This is not preferable because the strength (tensile strength, tear strength) of the paper tends to decrease.
逆に、顔料としてシリカやタルク等の吸油性の高い顔料を使用した場合は、粘着剤が目止め層に吸収されやすく、均一な転写性が得られにくいため好ましくない。 On the other hand, when a pigment having a high oil absorption property such as silica or talc is used as the pigment, the pressure-sensitive adhesive is easily absorbed by the sealing layer, and it is difficult to obtain a uniform transfer property.
また、後述する剥離層において、水性シリコーンおよびポリビニルアルコールを主成分とする塗料を塗工した場合、水性シリコーンが目止め層の顔料となじみにくいため剥離層に塗工ムラが発生しやすい。しかしながら、顔料として粒子径０．３〜０．８μｍの粒子が全体の７０％以上、より好ましくは８０％以上を占めるクレーを用いると、剥離層の塗工ムラが低減でき、より均一な転写性に優れる工程剥離紙が得られることが判った。 In addition, when a paint containing water-based silicone and polyvinyl alcohol as a main component is applied to the release layer described later, coating unevenness is likely to occur in the release layer because the water-based silicone is less likely to blend with the pigment of the filler layer. However, when a clay in which particles having a particle diameter of 0.3 to 0.8 μm occupy 70% or more of the whole, more preferably 80% or more, is used as a pigment, uneven coating of the release layer can be reduced and more uniform transferability can be achieved. It was found that a process release paper excellent in the process can be obtained.
上述のごとく、目止め層の顔料としてクレーを顔料全体の７０〜１００質量％含有すると、水性シリコーンを含有する剥離層上に、粘着剤を均一に塗工することができ、かつポリウレタンフィルム上に均一に転写できるため、基材とポリウレタンフィルムの密着性が高く均一なウレタンフィルム研磨布が得られる。更にはクレーの粒子径の分布において、０．３〜０．８μｍの粒子が全体の７０％以上、より好ましくは８０％以上を占めると、更に粘着剤を均一に塗工することができ、更に基材とポリウレタンフィルムの密着性が高く均一なウレタンフィルム研磨布が得られる。特に粘着力が強い粘着剤からなる粘着層を均一に設け、かつ被粘着物上に転写した後においても均一な粘着層を形成できる工程剥離紙が得られる。加えて、クレーとして特にカオリンクレーを用いると、更に均一な粘着層および転写性が得られやすいため好ましい。 As described above, when 70 to 100% by mass of the clay is contained as a pigment for the sealing layer, the pressure-sensitive adhesive can be uniformly applied on the release layer containing the aqueous silicone, and on the polyurethane film. Since uniform transfer is possible, a uniform urethane film polishing cloth with high adhesion between the substrate and the polyurethane film can be obtained. Furthermore, in the particle size distribution of the clay, when the particles of 0.3 to 0.8 μm occupy 70% or more of the whole, more preferably 80% or more, the pressure-sensitive adhesive can be applied more uniformly. A uniform urethane film polishing cloth with high adhesion between the substrate and the polyurethane film is obtained. In particular, a process release paper is obtained in which a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive is uniformly provided and a uniform pressure-sensitive adhesive layer can be formed even after being transferred onto an adherend. In addition, it is preferable to use kaolin clay as the clay because it is easy to obtain a more uniform adhesive layer and transferability.
尚、本発明の粒子径は次のように測定した。走査電子顕微鏡（型番：Ｓ−２１５０、（株）日立製作所製）を用いて、顔料としてクレーを塗工した塗工紙表面の顔料粒子を撮影した。クレー粒子は真円ではないため、粒子の面積と同程度の面積となるよう真円を描き、その直径を粒子径とした。撮影は倍率１２０００倍で１０枚行い、写真毎に１０点ずつ、合計１００点の顔料粒子について粒子径を求めた。 The particle diameter of the present invention was measured as follows. Using a scanning electron microscope (model number: S-2150, manufactured by Hitachi, Ltd.), pigment particles on the surface of coated paper coated with clay as a pigment were photographed. Since the clay particles are not a perfect circle, a perfect circle was drawn so as to have an area approximately the same as the area of the particles, and the diameter was taken as the particle diameter. Photographing was performed 10 times at a magnification of 12,000 times, and the particle diameter was determined for a total of 100 pigment particles, 10 points for each photograph.
（接着剤）
目止め層に用いることができる接着剤としては、一般的に製紙用途で使用できる接着剤を使用することができる。例えばカゼイン、大豆蛋白等の蛋白質類；メチルメタクリレート−ブタジエン共重合体ラテックス、スチレン−ブタジエン共重合体ラテックス等の共役ジエン系ラテックス、アクリル酸エステル及び／又はメタクリル酸エステルの重合体ラテックスもしくは共重合体ラテックス等のアクリル系ラテックス、エチレン−酢酸ビニル重合体ラテックス等のビニル系ラテックス、あるいはこれらの各種共重合体ラテックスをカルボキシル基等の官能基含有単量体で変性したアルカリ部分溶解性又は非溶解性のラテックス等のラテックス類；ポリビニルアルコール、オレフィン−無水マレイン酸樹脂、メラミン樹脂、尿素樹脂、ウレタン樹脂等の合成樹脂系接着剤；酸化澱粉、陽性化澱粉、エステル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース等のセルロース誘導体等の、通常塗工紙に用いられる接着剤が例示され、これらの中から１種又は２種以上を適宜選択して併用することができる。
(adhesive)
As an adhesive that can be used for the sealing layer, an adhesive that can be generally used for papermaking can be used. For example, proteins such as casein and soy protein; conjugated diene latex such as methyl methacrylate-butadiene copolymer latex and styrene-butadiene copolymer latex, polymer latex or copolymer of acrylate ester and / or methacrylate ester Acrylic latex such as latex, vinyl latex such as ethylene-vinyl acetate polymer latex, or various types of copolymer latex modified with a functional group-containing monomer such as a carboxyl group. Latexes such as latex; synthetic resin adhesives such as polyvinyl alcohol, olefin-maleic anhydride resin, melamine resin, urea resin, urethane resin; starches such as oxidized starch, positive starch, esterified starch, dextrin; Carboxymethyl Cellulose, such as cellulose derivatives such as hydroxyethyl cellulose, are adhesives exemplified usually used for coated paper can be used in combination one or more from among the appropriately selected and.
上記接着剤の中でも特にラテックス、特にスチレン−ブタジエン共重合体ラテックスが熱安定性が良いため好ましい。特に、ガラス転移温度が−１０〜２０℃、重量平均粒子径が６０〜１２０ｎｍ、ゲル含有量が７０〜８５質量％であると、より均一な接着層が得られるため好ましい。 Among the above adhesives, latex, particularly styrene-butadiene copolymer latex, is preferable because of its good thermal stability. In particular, a glass transition temperature of −10 to 20 ° C., a weight average particle diameter of 60 to 120 nm, and a gel content of 70 to 85% by mass are preferable because a more uniform adhesive layer can be obtained.
尚、ガラス転移温度、ラテックスのゲル含有量、重量平均粒子径は次のとおり求めた。 The glass transition temperature, latex gel content, and weight average particle size were determined as follows.
ガラス転移温度
ラテックスを１００℃で２０時間真空乾燥を行い、フィルムを作成した。上記乾燥フィルムを示差走査熱量計（デュポン社製）を用いて、昇温速度２０℃／分で測定した。
Glass transition temperature The latex was vacuum dried at 100 ° C. for 20 hours to form a film. The dry film was measured using a differential scanning calorimeter (manufactured by DuPont) at a heating rate of 20 ° C./min.
ゲル含有量
ラテックス約０．３ｇをスライドグラス上に薄く広げ、５０℃の乾燥機でフィルムとなるまで乾燥した。ラテックスフィルムを約５０ｍｌのトルエン中に一昼夜浸せきし、ガラスフィルターでろ過後、ろ液を１０５℃の乾燥機で乾燥して、トルエン可溶分の重量を測定した。ここで得られたトルエン可溶分の重量から、次式によりゲル含有量を算出した。
ゲル含有量（％）＝（乾燥フィルム重量−トルエン可溶分重量）×１００／乾燥フィルム重量
重量平均粒子径
ラテックスを０．０５〜０．２％濃度に希釈した試料を調製し、波長５２５ｎｍの吸光度を測定し、あらかじめ作成した検量線により求めた。
Gel content About 0.3 g of latex was thinly spread on a slide glass and dried with a dryer at 50 ° C. until a film was formed. The latex film was immersed in about 50 ml of toluene for a whole day and night, filtered with a glass filter, and then the filtrate was dried with a dryer at 105 ° C. to measure the weight of toluene-soluble matter. The gel content was calculated from the weight of the toluene-soluble component obtained here by the following formula.
Gel content (%) = (dry film weight−toluene soluble weight) × 100 / dry film weight Weight average particle diameter A sample in which latex was diluted to a concentration of 0.05 to 0.2% was prepared, and a wavelength of 525 nm was prepared. Absorbance was measured and obtained from a calibration curve prepared in advance.
上述のとおり、目止め層の顔料として、粒子径０．３〜０．８μｍの粒子が全体の７０％以上、より好ましくは８０％以上を占めるクレー、より好ましくはカオリンクレーと、接着剤として、ガラス転移温度が−１０〜２０℃、重量平均粒子径が６０〜１２０ｎｍ、ゲル含有量が７０〜８５質量％のスチレン−ブタジエン共重合体ラテックスを用いると、均一な接着層が得られ、転写性が良好となるため好ましい。 As described above, as a pigment for the filler layer, clay having a particle size of 0.3 to 0.8 μm accounts for 70% or more of the whole, more preferably 80% or more, more preferably kaolin clay, and adhesive. When a styrene-butadiene copolymer latex having a glass transition temperature of −10 to 20 ° C., a weight average particle diameter of 60 to 120 nm, and a gel content of 70 to 85 mass% is used, a uniform adhesive layer can be obtained and transferability can be obtained. Is preferable because
目止め層における接着剤の配合量は、顔料１００質量部に対して、５〜２５質量部であることが好ましい。この範囲では、より均一な接着層を形成でき、かつ接着層の転写性に優れた工程剥離紙を得ることができる。 It is preferable that the compounding quantity of the adhesive agent in a sealing layer is 5-25 mass parts with respect to 100 mass parts of pigments. Within this range, a more uniform adhesive layer can be formed, and a process release paper having excellent adhesive layer transferability can be obtained.
（塗工方法）
目止め層を設ける方法は、従来塗工紙用途で使用されてきた方法を用いることができる。つまり、サイズプレス、フィルム転写型ロールコーター（ゲートロールコーターやロッドメタリングサイズプレス）、ブレードコーター、ロッドコーター、エアーナイフコーター、カーテンコーター、スプレーコーターなどが挙げられる。
(Coating method)
As a method of providing the sealing layer, a method that has been conventionally used for coated paper can be used. That is, size presses, film transfer type roll coaters (gate roll coaters and rod metering size presses), blade coaters, rod coaters, air knife coaters, curtain coaters, spray coaters, and the like.
目止め層の塗工量は、片面あたり４〜１０ｇ／ｍ２が好ましく、５〜８ｇ／ｍ２がより好ましい。４ｇ／ｍ２未満では十分な平坦性を得ることができず、１０ｇ／ｍ２を超過すると、過剰品質でコストアップとなり、紙粉発生の原因にもなりやすい。 The coating amount of the sealing layer is preferably 4 to 10 g / m 2 and more preferably 5 to 8 g / m 2 per side. If it is less than 4 g / m 2 , sufficient flatness cannot be obtained, and if it exceeds 10 g / m 2 , the cost is increased due to excessive quality, and paper dust is likely to be generated.
＜剥離層＞
目止め層の上には、水性シリコーンを主成分とする剥離層を設ける。
<Peeling layer>
A release layer mainly composed of aqueous silicone is provided on the sealing layer.
本発明で用いる水性シリコーンは、シリコーン化合物を乳化剤等の界面活性剤を用いて水中に乳化したシリコーンエマルジョン、親水基による変性等によりシリコーン化合物を水中に分散させて得られたシリコーン分散体等である。このようなシリコーンとしては、例えば信越化学社製の品番ＫＭ−３５９１等が挙げられる。 The aqueous silicone used in the present invention is a silicone emulsion obtained by emulsifying a silicone compound in water using a surfactant such as an emulsifier, a silicone dispersion obtained by dispersing a silicone compound in water by modification with a hydrophilic group, or the like. . As such silicone, for example, product number KM-3591 manufactured by Shin-Etsu Chemical Co., Ltd. may be mentioned.
水性シリコーンは、それ単体で顔料および接着剤からなる目止め層表面に塗工すると、顔料との親和性が低いため塗料の弾きが強く均一な塗工ができない。弾きを押さえるためには水性シリコーンに水溶性樹脂を加えて水性シリコーンと目止め層の顔料との親和性を高めることが必要となる。水溶性樹脂の中でもポリビルアルコールを用いると、好適に弾きを防止することができ、工程剥離紙として使用できる剥離層を得ることができる。 When the aqueous silicone is applied alone to the surface of the sealing layer made of a pigment and an adhesive, the coating with the paint is strong and uniform coating cannot be performed due to its low affinity with the pigment. In order to suppress the flipping, it is necessary to add a water-soluble resin to the aqueous silicone to increase the affinity between the aqueous silicone and the pigment of the sealing layer. When polyville alcohol is used among water-soluble resins, it is possible to suitably prevent repelling and to obtain a release layer that can be used as a process release paper.
ポリビニルアルコールとしては、一般に製紙用途で使用されているものであれば特に限定されず、各種ケン化度や重合度を有する未変性のポリビニルアルコールや、カルボキシル基、スルホ基等のアニオンで変性されたアニオン変性ポリビニルアルコール、アミノ基、アンモニウム基等のカチオンで変性されたカチオン変性ポリビニルアルコール、シラノール変性ポリビニルアルコール、アルコキシル変性ポリビニルアルコール、エポキシ変性ポリビニルアルコール、チオール変性ポリビニルアルコール等のランダム共重合体；アニオン変性、カチオン変性、チオール変性、シラノール変性、アルコキシル変性及びエポキシ変性等変性が末端基のみに行われているポリビニルアルコール、アクリルアミド、アクリル酸等の水溶性モノマーを導入したブロック共重合ポリビニルアルコール、シラノール基等をグラフトさせたグラフト共重合ポリビニルアルコール等を使用することができる。 The polyvinyl alcohol is not particularly limited as long as it is generally used for papermaking, and has been modified with an unmodified polyvinyl alcohol having various saponification degrees or polymerization degrees, or an anion such as a carboxyl group or a sulfo group. Random copolymers such as anion-modified polyvinyl alcohol, cation-modified polyvinyl alcohol modified with cations such as amino group, ammonium group, silanol-modified polyvinyl alcohol, alkoxyl-modified polyvinyl alcohol, epoxy-modified polyvinyl alcohol, thiol-modified polyvinyl alcohol; anion-modified Deriving water-soluble monomers such as polyvinyl alcohol, acrylamide, and acrylic acid, which are modified only on the end groups, such as cation modification, thiol modification, silanol modification, alkoxyl modification, and epoxy modification. Block copolymer of polyvinyl alcohol, a graft copolymer of polyvinyl alcohol obtained by grafting a silanol group, and the like can be used.
ポリビニルアルコールのケン化度は、９０ｍｏｌ％を超える完全ケン化タイプや、ケン化度が９０ｍｏｌ％以下の部分ケン化タイプの、いずれをも使用することができるが、ケン化度が７２．５〜９２．５ｍｏｌ％であることが好ましく、その中でも７６．５〜８９．０ｍｏｌ％の部分ケン化タイプが更に好ましく、８０．０〜８３．０ｍｏｌ％であることが特に好ましい。ケン化度が７２．５ｍｏｌ％を下回ったり、９２．５ｍｏｌ％を超過すると、目止め層中の顔料が水性シリコーンを弾きやすくなり、均一な塗工層が得られないため、剥離層上に均一な粘着層を形成しにくいだけでなく、ポリウレタンフィルムへの転写性に劣り粘着層の均一性が低下し、得られるウレタンフィルム研磨布の表面性や均一性に劣り、研磨布としての性能が低下する可能性があるため好ましくない。特に、一般の粘着性フィルムよりも高い粘着性が必要とされるウレタンフィルム研磨布用途においては、上述の範囲のケン化度を有するポリビニルアルコールを使用してシリコーンの弾きを低減することにより、均一な粘着層を形成でき、ポリウレタンフィルムと基材とを均一に粘着できるため、よりウレタンフィルム研磨布に好適に使用できる工程剥離紙となる。 The saponification degree of polyvinyl alcohol can be either a complete saponification type exceeding 90 mol% or a partial saponification type having a saponification degree of 90 mol% or less, but the saponification degree is 72.5 to 92.5 mol% is preferable, and among them, a saponification type of 76.5-89.0 mol% is more preferable, and 80.0-83.0 mol% is particularly preferable. If the saponification degree is less than 72.5 mol% or exceeds 92.5 mol%, the pigment in the filler layer tends to repel the aqueous silicone, and a uniform coating layer cannot be obtained. Not only is it difficult to form an adhesive layer, but also the transferability to polyurethane film is poor and the uniformity of the adhesive layer is reduced. The surface properties and uniformity of the resulting urethane film polishing cloth are inferior, and the performance as an abrasive cloth is reduced. This is not preferable because of the possibility. In particular, in urethane film polishing cloth applications that require higher adhesiveness than general adhesive films, the use of polyvinyl alcohol having a saponification degree in the above-mentioned range reduces silicone repelling and makes it uniform. A pressure-sensitive adhesive layer can be formed, and the polyurethane film and the substrate can be uniformly adhered, so that the process release paper can be more suitably used for a urethane film polishing cloth.
尚、ポリビニルアルコール中の酢酸ビニル単位のケン化度は、ＪＩＳＫ６７２６に準じて測定した。 In addition, the saponification degree of the vinyl acetate unit in polyvinyl alcohol was measured according to JISK6726.
ポリビニルアルコールの重合度は、４００〜１０００が好ましく、５００〜１０００がより好ましく、５００〜６００が最も好ましい。重合度が４００を下回ると、剥離層の耐水性が低下し、転写性が均一となりにくい。重合度が１０００を超過すると、目止め層に剥離剤を塗工する際に弾きやすくなる。 400-1000 are preferable, as for the polymerization degree of polyvinyl alcohol, 500-1000 are more preferable, and 500-600 are the most preferable. When the degree of polymerization is less than 400, the water resistance of the release layer is lowered, and transferability is difficult to be uniform. When the degree of polymerization exceeds 1000, it becomes easy to play when a release agent is applied to the sealing layer.
尚、ポリビニルアルコールの重合度は、溶媒としてイオン交換水を用いてオストワルド粘度計により３０℃で測定した極限粘度［η］（ｇ／ｄｌ）から、次式により粘度平均重合度（Ｐ）を求めた。 The degree of polymerization of polyvinyl alcohol is determined from the intrinsic viscosity [η] (g / dl) measured at 30 ° C. with an Ostwald viscometer using ion-exchanged water as a solvent, and the viscosity average degree of polymerization (P) is obtained from the following formula. It was.
剥離層を形成する塗工液におけるポリビニルアルコールの含有量としては、水性シリコーン１００質量部に対して、乾燥重量基準で３０〜５０質量部である必要があり、より好ましくは３５〜４５質量部である。含有量が３０質量部を下回ると、粘着層形成用途に用いる際の耐熱性に劣り、寸法安定性が低下するだけでなくシワ入りや波打ちが発生しやすく、粘着剤が均一に転写できにくくなる。５０質量部を上回ると、粘着剤との親和性が高くなりポリウレタンフィルムに粘着層が均一に転写しにくくなるため好ましくない。上述のとおり、ウレタンフィルム研磨布用途に用いるポリウレタンフィルムに基材を貼り付けるための粘着層を形成する工程剥離紙用途においては、顔料および接着剤からなる目止め層の上に、水性シリコーンおよびポリビニルアルコールを主成分とする剥離層を設けることが好ましいが、ポリビニルアルコールの含有量は水性シリコーン１００質量部に対して、乾燥重量基準で３０〜５０質量部とする必要があり、より好ましくは、３５〜４５質量部であり、これによりウレタンフィルム研磨布のごとく粘着性の高い粘着剤を用いる場合であっても、均一な粘着層を形成でき、均一な転写性を有する工程剥離紙を得ることができ、得られるウレタンフィルム研磨布の表面性が向上できるため好ましい。 As content of polyvinyl alcohol in the coating liquid which forms a peeling layer, it is necessary to be 30-50 mass parts on a dry weight basis with respect to 100 mass parts of aqueous silicone, More preferably, it is 35-45 mass parts. is there. When the content is less than 30 parts by mass, the heat resistance when used in the adhesive layer forming application is inferior, and not only the dimensional stability is lowered, but also wrinkles and undulations easily occur, and it becomes difficult to transfer the adhesive uniformly. . When the amount exceeds 50 parts by mass, the affinity with the pressure-sensitive adhesive is increased, and the pressure-sensitive adhesive layer is difficult to uniformly transfer to the polyurethane film. As described above, a process for forming a pressure-sensitive adhesive layer for attaching a base material to a polyurethane film used for a urethane film polishing cloth. Although it is preferable to provide a release layer mainly composed of alcohol, the content of polyvinyl alcohol needs to be 30 to 50 parts by weight based on the dry weight with respect to 100 parts by weight of aqueous silicone, more preferably 35 Even if it is a case where it is a case where it is a case where it is a case where a highly adhesive adhesive is used like a urethane film polishing cloth, it can form a uniform adhesive layer and can obtain the process release paper which has uniform transferability. This is preferable because the surface properties of the resulting urethane film polishing cloth can be improved.
同じ水溶性高分子である酸化澱粉、陽性化澱粉、エステル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース等のセルロース誘導体等の、通常塗工紙に用いられる水溶性高分子等を併用することもできるが、ポリビニルアルコールに比べて耐熱性に劣り、シワ入りや波打ちが発生して粘着剤が均一に転写できないだけでなく、剥離強度が経時で変化したり、湿度変化の影響を受けやすい問題があるため、使用する際は注意が必要である。 The same water-soluble polymer, such as oxidized starch, positive starch, esterified starch, and dextrin starch; water-soluble polymer that is usually used for coated paper, such as cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose However, it is inferior to polyvinyl alcohol in heat resistance, and wrinkles and undulations occur, and the adhesive cannot be transferred uniformly, and the peel strength changes over time or is affected by humidity changes. Because there are easy problems, care must be taken when using it.
上述のごとく、水性シリコーン及びポリビニルアルコールを混合して用いると、顔料塗工層である目止め層中の顔料との親和性が高くなり、目止め層上に水性シリコーンが均一に塗工できるため、均一な粘着層が形成でき、粘着層がポリウレタンフィルムに均一に転写できるため好ましい。更に、ケン化度が７２．５〜９２．５ｍｏｌ％、重合度が４００〜１０００、更に好ましくは５００〜１０００、最も好ましくは５００〜６００であるポリビニルアルコールを、水性シリコーン１００質量部に対して、３０〜５０質量部の割合で混合して用いると、シリコーン塗工性が良好となるだけでなく、均一な粘着層が得られ、均一な転写性を付与でき、転写後の粘着層の表面平坦性が高くなるため好ましい。かつ、寸法安定性や耐熱性に優れ、経時で剥離力が変化しにくい、使用しやすい工程剥離紙が得られやすいため好ましい。 As described above, when a mixture of aqueous silicone and polyvinyl alcohol is used, the affinity with the pigment in the sealing layer, which is a pigment coating layer, increases, and the aqueous silicone can be uniformly coated on the sealing layer. A uniform adhesive layer can be formed, and the adhesive layer can be uniformly transferred to the polyurethane film, which is preferable. Furthermore, polyvinyl alcohol having a saponification degree of 72.5 to 92.5 mol%, a polymerization degree of 400 to 1000, more preferably 500 to 1000, and most preferably 500 to 600 is added to 100 parts by mass of aqueous silicone. When mixed and used at a ratio of 30 to 50 parts by mass, not only the silicone coating property is improved, but also a uniform adhesive layer can be obtained, uniform transferability can be imparted, and the surface of the adhesive layer after transfer is flat. It is preferable because of its high properties. Moreover, it is preferable because it is excellent in dimensional stability and heat resistance, and is easy to use, because it is easy to obtain a process release paper whose peel force does not easily change over time.
特にウレタンフィルム研磨布は研磨用途に用いられるため、表面の平坦性が重要である。このため、工程剥離紙には均一な粘着層を形成し、粘着層をポリウレタンフィルムに均一に転写する必要があるが、上述のとおり、水性シリコーンからなる剥離剤に対し、ケン化度が７２．５〜９２．５ｍｏｌ％、重合度が４００〜１０００のポリビニルアルコールを、更に好ましくはケン化度が７６．５〜８９．０ｍｏｌ％、重合度が５００〜１０００、最も好ましくは５００〜６００のポリビニルアルコールを、シリコーン１００質量部に対して３０〜５０質量部配合することで、均一な粘着層を形成でき、その粘着層を均一にポリウレタンフィルムに転写でき、寸法安定性や耐熱性に優れ、表面性が良好なウレタンフィルム研磨布を得ることができた。 In particular, since a urethane film polishing cloth is used for polishing, surface flatness is important. For this reason, it is necessary to form a uniform pressure-sensitive adhesive layer on the process release paper and to transfer the pressure-sensitive adhesive layer uniformly to the polyurethane film. As described above, the saponification degree is 72.degree. 5-92.5 mol%, a polyvinyl alcohol having a polymerization degree of 400-1000, more preferably a saponification degree of 76.5-89.0 mol%, a polymerization degree of 500-1000, most preferably 500-600 polyvinyl alcohol Is blended in an amount of 30 to 50 parts by mass with respect to 100 parts by mass of silicone, a uniform adhesive layer can be formed, the adhesive layer can be uniformly transferred to a polyurethane film, excellent in dimensional stability and heat resistance, and surface properties. A good urethane film polishing cloth was obtained.
上述の水性シリコーン及びポリビニルアルコールからなる剥離層は、上述した目止め層の上に設けることで、均一な粘着層を形成することができる。つまり、顔料として粒子径０．３〜０．８μｍの粒子が全体の７０％以上、より好ましくは８０％以上を占めるカオリンクレーと、接着剤として、ガラス転移温度が−１０〜２０℃、重量平均粒子径が６０〜１２０ｎｍ、ゲル含有量が７０〜８５質量％のスチレン−ブタジエン共重合体ラテックスを用いた目止め層の上に、上述の水性シリコーン及びポリビニルアルコールからなる剥離層を設けると、粘着力が強い粘着剤からなる粘着層を均一に形成でき、かつ、ポリウレタンフィルム上に均一に粘着層を転写できるため好ましい。 By providing the release layer made of the above-described aqueous silicone and polyvinyl alcohol on the above-described sealing layer, a uniform adhesive layer can be formed. That is, kaolin clay in which particles having a particle diameter of 0.3 to 0.8 μm as a pigment occupy 70% or more of the whole, more preferably 80% or more, and as an adhesive, a glass transition temperature of −10 to 20 ° C., a weight average When a release layer composed of the above-mentioned aqueous silicone and polyvinyl alcohol is provided on a sealing layer using a styrene-butadiene copolymer latex having a particle size of 60 to 120 nm and a gel content of 70 to 85% by mass, adhesion is achieved. A pressure-sensitive adhesive layer made of a strong pressure-sensitive adhesive can be uniformly formed, and the pressure-sensitive adhesive layer can be uniformly transferred onto a polyurethane film, which is preferable.
本発明の工程剥離紙の剥離層には、上記以外にも、一般に製紙用途で使用できる顔料、蛍光増白剤、蛍光増白剤の被染着物質、消泡剤、離型剤、着色剤、保水剤等の通常使用される各種薬品を適宜配合することもできる。 For the release layer of the process release paper of the present invention, in addition to the above, pigments that can be generally used for papermaking, fluorescent whitening agents, dyed substances of fluorescent whitening agents, antifoaming agents, mold release agents, colorants In addition, various commonly used chemicals such as water retention agents can be appropriately blended.
剥離層の塗工量は、片面あたり０．３〜３．０ｇ／ｍ２が好ましく、０．５〜１．２ｇ／ｍ２がより好ましい。０．３ｇ／ｍ２未満では均一な転写性を得ることができず、３．０ｇ／ｍ２を超過すると、シリコーンが硬化不良を起こして脱落しやすくなり、均一な粘着層を形成できないばかりか、均一な転写性が得られない可能性があるため好ましくない。またコストアップにもなる。このようにして得られる本発明の工程剥離紙は、ウレタンフィルム研磨布の平坦性を向上することができる。 The coating amount of the release layer is preferably 0.3 to 3.0 g / m 2 and more preferably 0.5 to 1.2 g / m 2 per side. If it is less than 0.3 g / m 2 , uniform transferability cannot be obtained, and if it exceeds 3.0 g / m 2 , the silicone is poorly cured and easily falls off, so that a uniform adhesive layer cannot be formed. This is not preferable because uniform transferability may not be obtained. It also increases costs. The process release paper of the present invention thus obtained can improve the flatness of the urethane film polishing cloth.
このようなウレタンフィルム研磨布用途の工程剥離紙は、次の評価基準に基づく転写性測定試験において、適度な転写性を有するため好ましい。 Such a process release paper for urethane film polishing cloth is preferable because it has an appropriate transferability in a transferability measurement test based on the following evaluation criteria.
（用途）
本発明の工程剥離紙は、各種の工業用剥離紙に使用でき、特にウレタンフィルム研磨布においてポリウレタンフィルムと基材との間に配置され両者を貼り合わせる粘着剤層を、剥離紙表面に形成し、この粘着剤層を、ポリウレタンフィルム又は基紙に転写するために使用される工程剥離紙として使用できる。ウレタンフィルム研磨布２０は、図２に示すように、基材２１と、基材２１上に設けられた粘着剤層２２と、粘着剤層２２上に設けられたポリウレタンフィルム２３とからなる。ウレタンフィルム研磨布とは、レンズ、平行平面板、反射ミラー等の光学材料、ハードディスク用基板、シリコンウエハ、液晶ガラス等、高精度に平坦性が要求される材料の平坦加工用の研磨布の材料として使用され、研磨布の表面に多孔質構造を有するポリウレタンを設けたものである。特に、本発明の工程剥離紙１０は、ウレタンフィルム研磨布内部の粘着剤層形成用途に使用することができる。具体的には、工程剥離紙１０の剥離層１３の表面に粘着剤を塗布することで粘着剤層を形成し、形成した粘着剤層をポリウレタンフィルム又は基材の表面に転写する。その後、粘着剤層を持つポリウレタンフィルム又は基材を、基材又はポリウレタンフィルムと貼り合わせることで、図２の層構成を持つウレタンフィルム研磨布を形成する。本発明の工程剥離紙は、粘着力の強い粘着層を均一に形成し、かつ均一に転写できるため、得られるウレタンフィルム研磨布の表面性が良好であることや、貼り合わせ強度が高くなるメリットがある。
(Use)
The process release paper of the present invention can be used for various types of industrial release paper, and in particular, an adhesive layer that is disposed between a polyurethane film and a substrate in a urethane film polishing cloth and bonds the two together is formed on the release paper surface. The pressure-sensitive adhesive layer can be used as a process release paper used for transferring to a polyurethane film or a base paper. As illustrated in FIG. 2, the urethane film polishing cloth 20 includes a base material 21, a pressure-sensitive adhesive layer 22 provided on the base material 21, and a polyurethane film 23 provided on the pressure-sensitive adhesive layer 22. Urethane film polishing cloth is a material of polishing cloth for flat processing of materials that require flatness with high precision, such as optical materials such as lenses, parallel flat plates, reflection mirrors, hard disk substrates, silicon wafers, and liquid crystal glass. Used, and the surface of the polishing cloth is provided with polyurethane having a porous structure. Especially the process release paper 10 of this invention can be used for the adhesive layer formation use inside a urethane film polishing cloth. Specifically, the pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive to the surface of the release layer 13 of the process release paper 10, and the formed pressure-sensitive adhesive layer is transferred to the surface of the polyurethane film or the substrate. Then, the urethane film polishing cloth which has a layer structure of Drawing 2 is formed by pasting together a polyurethane film or a substrate with an adhesive layer with a substrate or a polyurethane film. The process release paper of the present invention can uniformly form a strong adhesive layer and transfer it uniformly, so that the surface properties of the resulting urethane film polishing cloth are good and the bonding strength is high. There is.
次に、実施例、比較例を挙げて本発明による作用効果を明らかにするが、本発明はこれら実施例に限定されるものではない。 Next, although an example and a comparative example are given and the operation effect by the present invention is clarified, the present invention is not limited to these examples.
１．実施例及び比較例
〔基紙〕
パルプ原料として広葉樹晒クラフトパルプを１００％使用し、フリーネスを３７０ｍｌに調成した。絶乾パルプ１ｔに対して、カチオン化澱粉を５ｋｇ、サイズ剤０．２ｋｇをそれぞれ有効成分基準で内添し、内添填料として軽質炭酸カルシウムを灰分１０％となるよう内添した。その後、長網抄紙機で抄造・乾燥し、表に記載の坪量の基紙を得た。抄紙機はツインワイヤー（ハイブリッドフォーマー）からなるワイヤーパート、オープンドローのないストレートスルー型のプレスパート、ダブルデッキ方式のドライヤーパートを用いて抄紙した。
1. Examples and Comparative Examples (Base Paper)
100% hardwood bleached kraft pulp was used as the pulp material, and the freeness was adjusted to 370 ml. 5 kg of cationized starch and 0.2 kg of sizing agent were internally added to the absolute dry pulp 1 t on the basis of active ingredients, respectively, and light calcium carbonate as an internal additive was internally added so as to have an ash content of 10%. Thereafter, papermaking and drying were performed with a long paper machine to obtain a base paper having a basis weight described in the table. The paper machine used a wire part consisting of twin wires (hybrid former), a straight-through press part without open draw, and a double-deck dryer part.
［目止め層の形成］
その後、表に記載の配合量の顔料（クレー、炭酸カルシウム、シリカ）と、顔料１００質量部に対して１０質量部のスチレン−ブタジエン共重合体ラテックス（品番：Ｔ−２７３０Ｐ、ＪＳＲ社製、ガラス転移温度１０℃、重量平均粒子径１１０ｎｍ、ゲル含有量７５質量％）を配合した目止め層を、ロッドメタリングサイズプレスコーターで、片面あたり８．０ｇ／ｍ２の塗工量となるよう、原紙の両面に塗工して製造した。用いた顔料は次のとおり。
クレー：カオリンクレー（品番：カピムＮＰ、イメリス社製）
炭酸カルシウム：重質炭酸カルシウム（品番：エスカロン＃９０、三共製粉（株）製）
シリカ：合成非晶質シリカ（型番：ニップジェルＡＺ−２０４、東ソー・シリカ社製）
但し、実施例９は上記のクレーをそのまま用い、他の実施例および比較例で用いたクレーは、表に記載の粒子径分布となるよう、湿式粉砕機（品番：プラネタリーミル、セイシン企業製）を用いて粉砕した。炭酸カルシウムおよびシリカは粉砕せず、そのまま用いた。比較例１及び２では目止め層を設けない代わりにポリエチレンラミネート層を設け、比較例３では目止め層もポリエチレンラミネート層も設けなかった。尚、比較例１及び２は、従来ウレタンフィルム研磨布用に用いられている工程剥離紙である。
[Formation of sealing layer]
Thereafter, the pigment (clay, calcium carbonate, silica) having the blending amount shown in the table, and 10 parts by mass of styrene-butadiene copolymer latex (product number: T-2730P, manufactured by JSR Corporation, glass with respect to 100 parts by mass of the pigment, glass A filler layer containing a transition temperature of 10 ° C., a weight average particle size of 110 nm, and a gel content of 75% by mass is coated with a rod metering size press coater so that the coating amount is 8.0 g / m 2 per side. Manufactured by coating on both sides of the base paper. The pigments used are as follows.
Clay: Kaolin clay (Product number: Capim NP, manufactured by Imeris)
Calcium carbonate: Heavy calcium carbonate (Product number: Escalon # 90, manufactured by Sankyo Flour Milling Co., Ltd.)
Silica: Synthetic amorphous silica (Model number: Nipgel AZ-204, manufactured by Tosoh Silica)
However, Example 9 uses the above-mentioned clay as it is, and the clay used in other Examples and Comparative Examples has a wet pulverizer (product number: planetary mill, manufactured by Seishin Enterprise Co., Ltd.) so that the particle size distribution shown in the table is obtained. ). Calcium carbonate and silica were used without being pulverized. In Comparative Examples 1 and 2, a polyethylene laminate layer was provided instead of providing a sealing layer, and in Comparative Example 3, neither a sealing layer nor a polyethylene laminate layer was provided. Comparative Examples 1 and 2 are process release papers conventionally used for urethane film polishing cloths.
〔剥離層の形成〕
表に示す種類及び割合で、シリコーン及び水溶性樹脂（ポリビニルアルコールおよびリン酸エステル化澱粉）を常温にて混合撹拌して剥離層用の塗工液を得た。用いた薬品は以下のとおりである。表に記載の水溶性樹脂の配合量は、乾燥重量基準でシリコーン１００質量部に対する割合である。なお、硬化触媒として市販の白金触媒をシリコーン１００質量部に対して３質量部使用した。
(Formation of release layer)
Silicone and a water-soluble resin (polyvinyl alcohol and phosphate esterified starch) were mixed and stirred at room temperature to obtain a coating solution for a release layer in the types and proportions shown in the table. The chemicals used are as follows. The blending amount of the water-soluble resin shown in the table is a ratio with respect to 100 parts by mass of silicone on a dry weight basis. In addition, 3 mass parts of commercially available platinum catalysts were used as a curing catalyst with respect to 100 mass parts of silicone.
・シリコーン
水性：水性シリコーン（品番：ＫＭ−３９５１、信越シリコーン（株）製）
溶剤：溶剤系シリコーン（品番：ＫＳ−３６０１、信越シリコーン（株）製）
無溶剤：無溶剤系シリコーン（品番：ＫＮＳ−３１６、信越シリコーン（株）製）
・ポリビニルアルコール（全てクラレ（株）社製）
品番：Ｌ−８、ケン化度：６９．５〜７２．５。重合度４００に調整した。
品番：ＰＶＡ−５０５、ケン化度：７２．５〜７４．５、重合度５００。
品番：Ｌ−９−７８、ケン化度：７６．５〜７９．０。重合度５００に調整した。
品番：ＰＶＡ−４０５、ケン化度：８０．０〜８３．０、重合度５００。
品番：ＰＶＡ−２０５、ケン化度：８６．５〜８９．０、重合度５００。
品番：ＰＶＡ−７０６、ケン化度：９０．５〜９２．５、重合度６００。
品番：ＰＶＡ−１１０、ケン化度：９８．０〜９９．０、重合度１０００。
・リン酸（リン酸エステル化澱粉、品番：ＭＳ４６００、日本食品加工社製）
上記塗工液を、前述した目止め層表面にエアーナイフコーターで、片面あたり乾燥質量が１．０ｇ／ｍ２となるように塗工し、熱風乾燥機で乾燥させた。
-Silicone Aqueous: Aqueous silicone (Part No .: KM-3951, manufactured by Shin-Etsu Silicone Co., Ltd.)
Solvent: Solvent-based silicone (Part No .: KS-3601, manufactured by Shin-Etsu Silicone Co., Ltd.)
Solvent-free: Solvent-free silicone (Product number: KNS-316, manufactured by Shin-Etsu Silicone Co., Ltd.)
・ Polyvinyl alcohol (all manufactured by Kuraray Co., Ltd.)
Product number: L-8, degree of saponification: 69.5-72.5. The degree of polymerization was adjusted to 400.
Product number: PVA-505, saponification degree: 72.5-74.5, polymerization degree 500.
Product number: L-9-78, degree of saponification: 76.5-79.0. The degree of polymerization was adjusted to 500.
Product number: PVA-405, saponification degree: 80.0-83.0, polymerization degree 500.
Product number: PVA-205, degree of saponification: 86.5-89.0, degree of polymerization 500.
Product number: PVA-706, degree of saponification: 90.5-92.5, degree of polymerization 600.
Product number: PVA-110, degree of saponification: 98.0-99.0, degree of polymerization 1000.
・ Phosphoric acid (phosphate esterified starch, product number: MS4600, manufactured by Nippon Food Processing Co., Ltd.)
The coating liquid was applied to the surface of the above-mentioned sealing layer with an air knife coater so that the dry mass per side was 1.0 g / m 2, and dried with a hot air dryer.
２．評価方法
以上のようにして製造した工程剥離紙について、以下のとおり測定・評価を行った。結果は、表１に示した。但し、シリコーン塗工性は目止め層を設けた基紙について評価した。
2. Evaluation Method The process release paper produced as described above was measured and evaluated as follows. The results are shown in Table 1. However, the silicone coatability was evaluated for a base paper provided with a sealing layer.
１）剛度
ＪＩＳＰ８１２５：２０００「紙及び板紙−こわさ試験方法−テーパーこわさ試験機法」に準じて、紙流れ方向（縦方向）のテーパー剛度を測定した。
1) Stiffness The taper stiffness in the paper flow direction (longitudinal direction) was measured according to JISP 8125: 2000 “Paper and paperboard—Stiffness test method—Taper stiffness tester method”.
２）引張強度
ＪＩＳＰ８１１３：２００６「紙及び板紙−引張特性の試験方法−第２部：定速伸張法」に準じて、紙流れ方向（縦方向）の引張強度を測定した。
2) Tensile strength The tensile strength in the paper flow direction (longitudinal direction) was measured according to JISP8113: 2006 “Paper and paperboard—Test method for tensile properties—Part 2: Constant speed extension method”.
３）引裂強度
ＪＩＳＰ８１１６：２０００「紙−引裂強さ試験方法−エルメンドルフ形引裂試験機法」に準じて、紙流れ方向（縦方向）の引裂強度を測定した。
3) Tear Strength The tear strength in the paper flow direction (longitudinal direction) was measured according to JISP8116: 2000 “Paper—Tear Strength Test Method—Elmendorf Tear Tester Method”.
４）シリコーン塗工性
目止め層表面に、表に記載の剥離層用の塗工液（濃度１２．５％）をワイヤーバーＮｏ．６で片面あたり１ｇ／ｍ２となるよう塗工した直後、塗工面積１０ｃｍ２あたりに含まれる弾き（未塗工領域）の個数を、目視で以下のとおり評価した。
◎：弾きがなく、均一な塗工層が得られた。
○：弾きが１〜２個発生したが、実使用可能。
△：弾きが３〜５個発生したが、実使用可能。
×：弾きが６個以上発生し、実使用不可能。
4) Silicone coating property On the surface of the sealing layer, the coating solution for the release layer (concentration: 12.5%) described in the table was applied to the wire bar No. Immediately after coating at 1 g / m 2 per side in No. 6, the number of repels (uncoated areas) contained per 10 cm 2 of coated area was visually evaluated as follows.
(Double-circle): There was no repelling and the uniform coating layer was obtained.
○: One to two hits occurred, but actual use is possible.
Δ: 3 to 5 hits occurred, but actual use is possible.
X: 6 or more strucks were generated, and actual use was impossible.
５）寸法変化率
Ａ４サイズ（２１０ｍｍ×２９７ｍｍ）の工程剥離紙に市販の粘着剤（アクリル系溶剤型粘着剤、品番：ＡＳ−１１０７、一方社油脂工業社製）を、Ｎｏ．２ワイヤーバーを用いて片面あたり２０ｇ／ｍ２塗布した後、１２０℃で２時間乾燥した。塗布乾燥前の工程剥離紙の面積（Ａ０）および塗布乾燥後の工程剥離紙の面積（Ａｔ）を測定し、次の式から寸法変化率（％）を求めた。尚、寸法変化率が１．０％以上であると寸法安定性に劣るため工程剥離紙用途に使用できず、１．０％以下であれば工程剥離紙として使用でき、０．７％以下であれば寸法安定性に優れ、０．５％以下であれば寸法安定性に特に優れる工程剥離紙となる。
寸法変化率（％）＝（Ａ０―Ａｔ）／Ａ０×１００
5) Dimensional change rate A4 size (210 mm x 297 mm) process release paper was coated with a commercially available pressure sensitive adhesive (acrylic solvent type pressure sensitive adhesive, product number: AS-1107, manufactured by Yushi Kogyo Co., Ltd.). After applying 20 g / m 2 per side using a 2 wire bar, it was dried at 120 ° C. for 2 hours. The area (A 0 ) of the process release paper before coating and drying and the area (A t ) of the process release paper after coating and drying were measured, and the dimensional change rate (%) was determined from the following formula. If the rate of dimensional change is 1.0% or more, the dimensional stability is inferior, so it cannot be used for a process release paper. If it is 1.0% or less, it can be used as a process release paper. If it exists, it will be excellent in dimensional stability, and if it is 0.5% or less, it will become a process release paper which is especially excellent in dimensional stability.
Dimensional change rate (%) = (A 0 −A t ) / A 0 × 100
６）耐熱性
寸法安定性試験後の工程剥離紙の表面のシワ入り、波打ちの程度を以下のとおり評価した。
◎：工程剥離紙の表面が均一であり、シワ入り、波打ちが発生していない。
○：工程剥離紙の表面に、目視では確認できないが、ルーペで１０倍に拡大すると微小なシワが確認できる。
△：工程剥離紙の表面に、目視で確認できる小さなシワがある。
×：工程剥離紙の表面に、目視で確認できる大きなシワがあり、工程剥離紙全体が波打っており、実使用不可能。
6) Heat resistance After the dimensional stability test, the surface of the release paper was evaluated for wrinkles and undulation as follows.
A: The surface of the process release paper is uniform, wrinkled, and no wavy.
◯: Although it cannot be visually confirmed on the surface of the process release paper, fine wrinkles can be confirmed when magnified 10 times with a magnifying glass.
Δ: There are small wrinkles that can be visually confirmed on the surface of the process release paper.
X: On the surface of the process release paper, there are large wrinkles that can be visually confirmed, and the entire process release paper is wavy, and cannot be used in practice.
７）粘着層転写性
寸法安定性試験で得た、粘着剤を塗布した工程剥離紙に、市販のウレタンフィルム（ＡＱＵＡ社製、型番：ウレタン防犯フィルムＫＧ１０６）の非粘着面であるポリウレタン層を乗せ、重さ４ｋｇの金属製の円筒形ローラーを一往復させて密着させた。工程剥離紙を剥がし粘着層を転写させ、工程剥離紙の表面に残留した粘着剤の量を以下のとおり評価した。
◎：工程剥離紙表面に粘着剤がほとんど残っていない。
○：工程剥離紙表面に粘着剤が僅かに残っているが、剥離しやすく繰り返し使用しても粘着剤が工程剥離紙表面に残留しない。
△：工程剥離紙表面に粘着剤が僅かに残っており、実使用には問題ないが、繰り返し使用できる回数が◎および○よりも少ない。
×：工程剥離紙表面に粘着剤が多く残り、実使用不可能。
7) Adhesive layer transferability A polyurethane layer, which is a non-adhesive surface of a commercially available urethane film (manufactured by AQUA, model number: urethane security film KG106), is placed on the release paper coated with an adhesive obtained in the dimensional stability test. Then, a metal cylindrical roller having a weight of 4 kg was brought into close contact with each other. The process release paper was peeled off to transfer the adhesive layer, and the amount of the adhesive remaining on the surface of the process release paper was evaluated as follows.
A: Almost no adhesive remains on the surface of the process release paper.
○: Although the pressure-sensitive adhesive remains slightly on the surface of the process release paper, the pressure-sensitive adhesive does not remain on the surface of the process release paper even if it is easily peeled and repeatedly used.
Δ: The pressure-sensitive adhesive remains slightly on the surface of the process release paper, and there is no problem in actual use, but the number of times it can be used repeatedly is less than ◎ and ○.
X: A lot of pressure-sensitive adhesive remains on the surface of the process release paper and cannot be used in practice.
８）リサイクル適性
Ａ４サイズ（２１０ｍｍ×２９７ｍｍ）の工程剥離紙を約５ｃｍ角に切り、水１リットル中に沈め、常温で３０分間、１００ＲＰＭで攪拌した後のパルプ原料の遊離性を目視で次のとおり評価した。
○：ほぼ全てのパルプが遊離し、リサイクル適性が良い。
×：ラミネート等に付着した一部のパルプが遊離せず、リサイクル適性が悪い。
8) Recycling suitability A4 size (210mm x 297mm) process release paper is cut into approximately 5cm square, submerged in 1 liter of water, and the freeness of the pulp raw material after stirring at 100 RPM for 30 minutes at room temperature is as follows. Evaluation was as follows.
○: Almost all the pulp is liberated and recyclability is good.
X: Some pulp adhering to the laminate or the like is not released, and the recyclability is poor.
本発明の工程剥離紙は、ポリウレタンフィルムと基材との間に配置され両者を粘着するための粘着層を、表面に形成し、ポリウレタンフィルム又は基材に転写するために使用することができる。 The process release paper of this invention can be used in order to form in the surface the adhesive layer for arrange | positioning between a polyurethane film and a base material, and sticking both together, and to transcribe | transfer to a polyurethane film or a base material.
１０ 工程剥離紙
１１ 基紙
１２ 目止め層
１３ 剥離層
２０ ウレタンフィルム研磨布
２１ 基材
２２ 粘着剤層
２３ ポリウレタンフィルム
10 Process Release Paper 11 Base Paper 12 Sealing Layer 13 Release Layer 20 Urethane Film Abrasive Cloth 21 Base Material 22 Adhesive Layer 23 Polyurethane Film
Claims (3)
前記工程剥離紙は、基紙と、前記基紙上に設けられた目止め層と、前記目止め層上に設けられた剥離層とからなり、
前記目止め層が顔料及び接着剤を主成分とする塗工層であり、
前記剥離層が、水性シリコーン及びポリビニルアルコールを含有し、
前記ポリビニルアルコールの含有割合が、乾燥質量で前記水性シリコーン１００質量部に対して、３０〜５０質量部であることを特徴とする工程剥離紙。 It is a process release paper for transferring and forming an adhesive layer on the surface of a polyurethane film or a substrate, and adhering the polyurethane film and the substrate,
The process release paper consists of a base paper, a sealing layer provided on the base paper, and a release layer provided on the sealing layer,
The sealing layer is a coating layer mainly composed of a pigment and an adhesive;
The release layer contains aqueous silicone and polyvinyl alcohol,
The process release paper, wherein a content ratio of the polyvinyl alcohol is 30 to 50 parts by mass with respect to 100 parts by mass of the aqueous silicone in terms of dry mass.
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| CN103437241B (en) * | 2013-05-25 | 2015-07-22 | 福建省铭兴激光科技有限公司 | Release paper for artificial leathers and preparation method thereof |
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| JPS63314275A (en) * | 1987-04-22 | 1988-12-22 | Shin Etsu Chem Co Ltd | Silicone emulsion composition for release paper and its production |
| JPH0522538U (en) * | 1991-09-02 | 1993-03-23 | リンテツク株式会社 | Adhesive sheet and release paper |
| JPH09328662A (en) * | 1996-06-12 | 1997-12-22 | Sekisui Chem Co Ltd | Production of tacky tape |
| JP2000170097A (en) * | 1998-12-03 | 2000-06-20 | Oji Paper Co Ltd | Release paper and its production |
| JP4021646B2 (en) * | 2001-11-09 | 2007-12-12 | 旭化成ケミカルズ株式会社 | Release material and release agent |
| JP4181930B2 (en) * | 2003-06-27 | 2008-11-19 | 東洋インキ製造株式会社 | Polishing pad laminate |
| JP5102426B2 (en) * | 2003-08-05 | 2012-12-19 | 東洋インキＳｃホールディングス株式会社 | Double-sided adhesive sheet and abrasive cloth laminate |
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