JPH0741584A - Production of easily bondable high-strength polyester film - Google Patents

Production of easily bondable high-strength polyester film

Info

Publication number
JPH0741584A
JPH0741584A JP5188016A JP18801693A JPH0741584A JP H0741584 A JPH0741584 A JP H0741584A JP 5188016 A JP5188016 A JP 5188016A JP 18801693 A JP18801693 A JP 18801693A JP H0741584 A JPH0741584 A JP H0741584A
Authority
JP
Japan
Prior art keywords
film
polyester
coating
stretching
stretched
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5188016A
Other languages
Japanese (ja)
Other versions
JP3270205B2 (en
Inventor
Sadami Miura
定美 三浦
Teruo Takahashi
輝夫 高橋
Masayuki Fukuda
雅之 福田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Ltd
Original Assignee
Teijin Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teijin Ltd filed Critical Teijin Ltd
Priority to JP18801693A priority Critical patent/JP3270205B2/en
Publication of JPH0741584A publication Critical patent/JPH0741584A/en
Application granted granted Critical
Publication of JP3270205B2 publication Critical patent/JP3270205B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To produce an easily bondable high-strength polyester film improved in slipperiness during the production, suppressed in the transfer of its coating film upon contact with hot rolls and excellent in the adhesion to a coating material, e.g. a magnetic coating material. CONSTITUTION:The production process comprises coating at least either surface of a lengthwise oriented film made of a polyester at least 70mol% of the acid component of which comprises terephtalic acid and/or naphthalenedicarboxylic acid with an easily bondable water-based coating fluid containing 99-80wt.% polyester resin having a second-order transition temperature of 20-150 deg.C and 1-20wt.% fine particles of a mean particle diameter of 0.01-0.1mum in a coating weight to give a final coating thickness of 0.005-0.03mum, subjecting the film to drying and crosswise orientation, orienting the film again in the lengthwise direction and optionally orienting the film again in the crosswise direction, and heat-setting the film.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は易接着性高強度ポリエス
テルフイルムの製造方法に関し、更に詳しくは熱転写が
なくかつすぐれた接着性を奏する易接着層を塗設した、
特に磁気記録媒体の基材として有用な高強度ポリエステ
ルフイルムの製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an easily-adhesive high-strength polyester film, and more specifically, an easily-adhesive layer having no heat transfer and having excellent adhesiveness is coated.
In particular, it relates to a method for producing a high-strength polyester film which is useful as a base material for magnetic recording media.

【0002】[0002]

【従来の技術】熱可塑性ポリエステル、例えばポリエチ
レンテレフタレートもしくはその共重合体、ポリエチレ
ンナフタレンジカルボキシレートもしくはその共重合
体、あるいはこれらと小割合の他樹脂とのブレンド物等
を溶融押出し、製膜することは公知である。そして得ら
れる二軸延伸熱固定したポリエステルフイルムは耐熱
性,ガス遮断性,電気的特性及び耐薬品性が他の樹脂か
らなるフイルムに比べて優れていることも知られてい
る。
2. Description of the Related Art A thermoplastic polyester such as polyethylene terephthalate or a copolymer thereof, polyethylene naphthalene dicarboxylate or a copolymer thereof, or a blend of these with a small proportion of another resin is melt-extruded to form a film. Is known. It is also known that the obtained biaxially stretched and heat-fixed polyester film is superior in heat resistance, gas barrier property, electrical property and chemical resistance to films made of other resins.

【0003】上記ポリエステルフイルムは、通常単純二
軸延伸法即ち縦方向及び横方向に同時延伸又は逐次延伸
し、その後高温熱固定することで製造される。ポリエス
テルフイルムは用途によっては一層の強度向上が望まれ
ており、この為に高強度ポリエステルフイルムの製造法
として縦,横方向に二軸延伸した後再度の縦延伸を行う
方法(再縦延伸法)が提案されている(特公昭34―5
887号,特公昭36―2258号等)。この再縦延伸
法は例えば二軸延伸後のポリエステルフイルムを延伸温
度80〜180℃、延伸倍率1.2倍以上の条件で再縦
延伸するものであり(場合によっては更に横延伸をす
る)、再縦延伸フイルムはその縦方向機械強度が、単な
る二軸延伸フイルムに比し、1.5倍以上と飛躍的に向
上している利点を有し、特にビデオテープを中心とする
磁気テープ用ベースフイルムとして極めて有用なもので
ある。
The above-mentioned polyester film is usually produced by a simple biaxial stretching method, that is, simultaneous or sequential stretching in the longitudinal and transverse directions, and then heat setting at high temperature. It is desired to further improve the strength of the polyester film depending on the application. Therefore, as a method for producing a high-strength polyester film, a method of biaxially stretching in the longitudinal and transverse directions and then longitudinal stretching again (re-longitudinal stretching method) Has been proposed (Japanese Patent Publication Sho 34-5)
887, Japanese Patent Publication No. 36-2258, etc.). In this re-longitudinal stretching method, for example, the polyester film after biaxial stretching is re-longitudinally stretched under the conditions of a stretching temperature of 80 to 180 ° C. and a stretching ratio of 1.2 times or more (in some cases, further lateral stretching). The re-longitudinal stretched film has the advantage that its mechanical strength in the machine direction is dramatically improved by more than 1.5 times compared to a simple biaxially stretched film. Especially, it is a base for magnetic tape centering on video tape. It is extremely useful as a film.

【0004】ところで、ポリエステルフイルムの表面は
高度に結晶配向されているので、表面の凝集性が高く、
例えば塗料、接着剤、インキ等の接着性に乏しい。
By the way, since the surface of the polyester film is highly crystallographically oriented, the surface is highly cohesive,
For example, the adhesiveness of paints, adhesives, inks, etc. is poor.

【0005】そこで、この接着性を改善する方法とし
て、物理処理例えばコロナ処理、紫外線処理、プラズマ
処理、EB処理、火焔処理等、或は薬剤処理例えばアル
カリ、アミン水溶液、トリクロル酢酸フェノール類等の
薬剤による処理が知られている。しかしながら、これら
の方法は接着力の経時劣化や薬剤の揮散による作業環境
の汚染等の実用上不利な問題がある。
Therefore, as a method for improving this adhesiveness, physical treatment such as corona treatment, ultraviolet treatment, plasma treatment, EB treatment, flame treatment and the like, or chemical treatment such as alkali, amine aqueous solution and trichloroacetic acid phenols and the like are used. Processing is known. However, these methods have practical disadvantages such as deterioration of adhesive strength with time and contamination of working environment due to volatilization of chemicals.

【0006】他の手段としては通常のポリエステルフイ
ルムの製膜工程以外のプロセスでフイルム表面に易接着
性塗液を塗布してプライマー層を設ける方法が知られて
いる。しかし、この方法では、通常塗液の溶剤として有
機溶剤を用い、またコーティング雰囲気が十分にクリー
ンであるとは言い難いので、塵埃の付着による加工商品
の表面欠陥の多発、あるいは有機溶剤による環境の悪化
等の安全、衛生上の問題がある。
As another means, there is known a method in which an easily adhering coating liquid is applied to the surface of the film to form a primer layer by a process other than the usual polyester film forming process. However, in this method, an organic solvent is usually used as a solvent for the coating liquid, and it is hard to say that the coating atmosphere is sufficiently clean. There are safety and hygiene problems such as deterioration.

【0007】そこで、このプライマー処理を水系塗液を
用いてポリエステルの製膜工程中で行なえば、クリーン
な環境の中で塵埃の付着もなく、また水系溶媒のため爆
発の恐れや環境の悪化もなく、フイルムの性能、経済
面、安全上の点で有利である。
Therefore, if this primer treatment is carried out in a polyester film forming process using an aqueous coating liquid, dust will not adhere in a clean environment, and there is a fear of explosion and deterioration of environment due to an aqueous solvent. It is advantageous in terms of film performance, economics and safety.

【0008】[0008]

【発明が解決しようとする課題】本発明者は、高強度ポ
リエステルフイルムの易接着化を図るべく、通常用いら
れている易接着バインダー塗液を、一段目の縦延伸後に
塗布したところ、再縦延伸時フイルムの滑り性が劣り、
摩擦係数が増大するため熱ロールへの塗膜の転写や、発
生する静電気による異物の付着等の問題の生じることが
明らかとなった。本発明者は、かかるトラブルを解消す
べく更に検討を行った結果、特定のフイラー(微粒子)
添加型ポリエステル樹脂を含む水性塗液を、特定の厚さ
となるように塗布すると上記トラブルを抑制し得ること
を見出し、本発明に到達した。
DISCLOSURE OF INVENTION Problems to be Solved by the Invention The inventors of the present invention applied a commonly used easy-adhesive binder coating liquid after the first longitudinal stretching in order to make the high-strength polyester film easily adhered. The slipperiness of the film is poor during stretching,
It became clear that problems such as transfer of the coating film to the heat roll and adhesion of foreign matter due to generated static electricity occur because the friction coefficient increases. As a result of further study to eliminate such troubles, the present inventor found that a specific filler (fine particles)
The inventors have found that the above problems can be suppressed by applying an aqueous coating solution containing an addition type polyester resin so as to have a specific thickness, and have reached the present invention.

【0009】本発明の目的は、その製造過程でのフイル
ムの滑りを良くし、熱ロール接触時の塗膜の転写を抑止
すると共に、フイルムに塗布される種々の被覆物、例え
ばオフセットインキ、グラビヤインキ、シルクスクリー
ンインキ、UVインキ、磁性塗料、粘着剤、電子写真ト
ナー、ケミカルマット塗料、ジアゾ塗料、ハードコート
塗料、UV塗料、ヒートシール性付与組成物、無機質皮
膜形成性物質等、特に磁性塗料に対し優れた接着性を有
しかつ粘着性のない、更には帯電性の低い易接着層を有
する易接着性高強度ポリエステルフイルムの製造方法を
提供することにある。
The object of the present invention is to improve the sliding property of the film during the manufacturing process thereof, to prevent the transfer of the coating film upon contact with a heat roll, and to coat various films such as offset ink and gravure. Inks, silk screen inks, UV inks, magnetic paints, adhesives, electrophotographic toners, chemical matte paints, diazo paints, hard coat paints, UV paints, heat sealability imparting compositions, inorganic film forming substances, etc., especially magnetic paints To provide a method for producing an easily-adhesive high-strength polyester film having an excellent adhesiveness, no tackiness, and an easily-adhesive layer having a low electrostatic property.

【0010】[0010]

【課題を解決するための手段】本発明の目的は、本発明
によれば、酸成分の70モル%以上がテレフタル酸及び
/又はナフタレンジカルボン酸からなるポリエステルの
縦延伸フイルムの少なくとも片面に、二次転移点が20
〜150℃のポリエステル樹脂99〜80重量%と平均
粒径0.01〜0.1μmの微粒子1〜20重量%とを
含む易接着水性塗液を最終的塗膜厚みが0.005〜
0.03μmとなる量塗布し、次いで乾燥及び横方向の
延伸を施し、更に縦方向へ再延伸し、要すれば横方向の
再延伸を行い、しかる後熱固定を施すことからなる易接
着性高強度ポリエステルフイルムの製造方法によって達
成される。
According to the present invention, the object of the present invention is to provide a longitudinally stretched film of polyester, in which 70 mol% or more of the acid component is terephthalic acid and / or naphthalene dicarboxylic acid, on at least one surface thereof. Next transition point is 20
The final coating film thickness is 0.005 with an easily-adhesive aqueous coating solution containing 99 to 80% by weight of a polyester resin at 150 ° C to 150% by weight and 1 to 20% by weight of fine particles having an average particle size of 0.01 to 0.1 µm.
Easy adhesion, consisting of coating 0.03 μm, drying and stretching in the transverse direction, re-stretching in the machine direction, re-stretching in the transverse direction if necessary, and then heat setting. It is achieved by a method of manufacturing a high strength polyester film.

【0011】本発明においてポリエステルフイルムを構
成するポリエステルとは、テレフタル酸及び/又はナフ
タレンジカルボン酸が全酸成分の70モル%を占める線
状飽和ポリエステルである。かかるポリエステルの具体
例として、ポリエチレンテレフタレート、ポリエチレン
―2,6―ナフタレンジカルボキシレート、テレフタル
酸―2,6―ナフタレンジカルボン酸―エチレングリコ
ール共重合体等が例示できる。
In the present invention, the polyester constituting the polyester film is a linear saturated polyester in which terephthalic acid and / or naphthalenedicarboxylic acid accounts for 70 mol% of all acid components. Specific examples of such polyesters include polyethylene terephthalate, polyethylene-2,6-naphthalenedicarboxylate, terephthalic acid-2,6-naphthalenedicarboxylic acid-ethylene glycol copolymer and the like.

【0012】前記線状飽和ポリエステルは、フイルム特
性を向上する剤例えば滑剤、帯電防止剤、着色剤、難燃
剤、遮光剤、安定剤、紫外線吸収剤等を含有することが
できる。この滑剤としては内部析出粒子、外部添加粒子
のいずれでもよく、また2種以上のものを組合せたもの
でもよい。外部添加粒子としては例えばシリカ、カオリ
ン、炭酸カルシウム、リン酸カルシウム、酸化チタン、
シリコーン樹脂粒子、架橋ポリスチレン粒子等を挙げる
ことができ、内部析出粒子としては例えばアルカリ(土
類)金属化合物、リン化合物等の組合せでポリエステル
製造中に析出させたものを挙げることができる。
The linear saturated polyester may contain a film property improving agent such as a lubricant, an antistatic agent, a colorant, a flame retardant, a light shielding agent, a stabilizer, and an ultraviolet absorber. The lubricant may be either internally precipitated particles or externally added particles, or may be a combination of two or more kinds. Examples of externally added particles include silica, kaolin, calcium carbonate, calcium phosphate, titanium oxide,
Examples thereof include silicone resin particles and crosslinked polystyrene particles, and examples of the internally deposited particles include those deposited during the production of polyester with a combination of an alkali (earth) metal compound, a phosphorus compound and the like.

【0013】本発明におけるポリエステルはそれ自体公
知であり、かつ公知の方法で製造することができる。ポ
リエステルの固有粘度(O―クロロフェノール、35
℃)は0.45〜0.9が好ましい。
The polyester in the present invention is known per se and can be produced by a known method. Intrinsic viscosity of polyester (O-chlorophenol, 35
C) is preferably 0.45 to 0.9.

【0014】本発明においては、ポリエステルを常法に
より溶融押出し急冷固化して、非晶質の未延伸フイルム
を得、そしてこの未延伸フイルムを先ず縦方向に延伸
し、次いで横方向に延伸する。これらの延伸はフイルム
を走行させて行う。縦方向及び横方向の延伸手段は公知
の手段を用いることができる。例えば、縦方向の延伸
(縦延伸)は未延伸フイルムを加熱ロール群で加熱し、
低速ロールと高速ロールの周速差を利用して行う。その
際、低速ロールと高速ロールの間に赤外線ヒーターを設
けてフイルムを延伸温度に加熱することが好ましく、ま
た低速ロールでフイルムを延伸温度に加熱しても良い。
この縦方向の延伸は定常時には1.5〜5.7倍の倍率
で行う。また、横方向の延伸(横延伸)はテンター式延
伸熱処理装置を用いて行う。この横方向の延伸は、再度
の横方向延伸を行わない場合には所定倍率で行うが、再
度横方向延伸を行う場合には所定倍率(総延伸倍率)よ
り低い倍率で行う。横方向にも延伸した二軸延伸フイル
ムには通常前述した方法の低い温度で熱(固定)処理を
施す。
In the present invention, polyester is melt-extruded and rapidly solidified by a conventional method to obtain an amorphous unstretched film, and this unstretched film is first stretched in the machine direction and then stretched in the cross direction. These stretchings are performed by running the film. As the stretching means in the machine direction and the transverse direction, known means can be used. For example, in the longitudinal stretching (longitudinal stretching), an unstretched film is heated with a heating roll group,
This is done by using the peripheral speed difference between the low speed roll and the high speed roll. At that time, an infrared heater is preferably provided between the low speed roll and the high speed roll to heat the film to the stretching temperature, and the low speed roll may heat the film to the stretching temperature.
This stretching in the machine direction is normally performed at a magnification of 1.5 to 5.7 times. The transverse stretching (transverse stretching) is performed using a tenter type stretching heat treatment device. This transverse stretching is performed at a predetermined magnification when the transverse stretching is not performed again, but is performed at a lower magnification than the predetermined magnification (total stretching magnification) when the transverse stretching is performed again. The biaxially stretched film stretched also in the transverse direction is usually subjected to a heat (fixing) treatment at a low temperature as described above.

【0015】かくして得られる二軸延伸フイルムは、更
に、少くとも縦方向、換言すると縦方向、或は縦方向と
横方向に延伸し、次いで熱(固定)処理を施す。この再
度の縦方向延伸(再縦延伸)は前述した一段目の縦方向
延伸手段と同じように行うことができ、また別の方法で
行うことができる。例えば一段目の縦方向延伸を赤外線
加熱方式で行い、再縦延伸をロール加熱方式で行うこと
ができる。再縦延伸の方法としては赤外線加熱方式の方
が、塗布物の接触する熱ロール温度が低く、工程上有利
である。また再度の横方向延伸(再横延伸)及び熱(固
定)処理はテンター式延伸熱処理装置を用いて行う。こ
のテンター式延伸熱処理装置において横方向延伸倍率を
1倍とすると、再横延伸を実質的に実施せず、単に熱固
定処理のみを施すことになる場合も、本発明の実施態様
である。
The biaxially stretched film thus obtained is further stretched at least in the longitudinal direction, in other words, in the longitudinal direction, or in the longitudinal direction and the transverse direction, and then subjected to heat (fixing) treatment. This re-longitudinal stretching (re-longitudinal stretching) can be performed in the same manner as the above-described first-stage longitudinal stretching means, or can be performed by another method. For example, the first-stage longitudinal stretching can be performed by an infrared heating method, and the re-longitudinal stretching can be performed by a roll heating method. As the method of re-longitudinal stretching, the infrared heating method is advantageous in terms of process since the temperature of the heat roll with which the coating material contacts is low. Further, the transverse stretching (re-transverse stretching) and the heat (fixing) treatment are performed again by using a tenter type stretching heat treatment apparatus. When the transverse stretching ratio is set to 1 in this tenter type stretching heat treatment apparatus, the case where the transverse transverse stretching is not substantially performed but only the heat setting treatment is performed is also an embodiment of the present invention.

【0016】本発明における縦延伸装置、横延伸装置、
再縦延伸装置、最終の熱処理装置等は、上述から理解で
きるように、従来から知られているものを用いることが
できる。
A longitudinal stretching device, a lateral stretching device,
As the re-longitudinal stretching device, the final heat treatment device, etc., as known from the above, those conventionally known can be used.

【0017】本発明における横延伸倍率は2倍以上、更
には2.5 倍以上、特に3倍以上が好ましい。もっとも再
横延伸を施すときには、上記倍率は再横延伸倍率との兼
合で定めることができる。横延伸倍率の上限はフイルム
特性によるが、6倍以下、更には5倍以下が好ましい。
The transverse stretching ratio in the present invention is preferably 2 times or more, more preferably 2.5 times or more, and particularly preferably 3 times or more. However, when the transverse re-stretching is performed, the above ratio can be determined in consideration of the transverse re-stretching ratio. The upper limit of the transverse stretching ratio depends on the film characteristics, but is preferably 6 times or less, more preferably 5 times or less.

【0018】再縦延伸の倍率は、フイルムの機械強度等
にもよるが、2.0倍以上、更には2.2倍以上が好ま
しい。この倍率の上限は、4.6倍程度とするのが好ま
しい。また、一段目の縦延伸倍率(所定倍率)は1.5
〜3.0倍、好ましくは1.5〜2.6倍である。
The re-longitudinal stretching ratio depends on the mechanical strength of the film, but is preferably 2.0 times or more, more preferably 2.2 times or more. The upper limit of this magnification is preferably about 4.6 times. The longitudinal stretching ratio (predetermined ratio) of the first stage is 1.5.
˜3.0 times, preferably 1.5 to 2.6 times.

【0019】最終熱処理の温度は150〜240℃、更
には170〜230℃の範囲から選択するのが好まし
い。この時間は通常数十秒以下である。また延伸温度は
従来から知られている温度範囲を選ぶことができる。
The temperature of the final heat treatment is preferably selected from the range of 150 to 240 ° C, more preferably 170 to 230 ° C. This time is usually several tens of seconds or less. The stretching temperature can be selected from the conventionally known temperature range.

【0020】本発明においては一段目の縦延伸後に易接
着水性塗液を塗布するが、この塗液は二次転移点が20
〜150℃のポリエステル樹脂とフイラー(微粒子)を
含むものである。
In the present invention, the easy-adhesion water-based coating liquid is applied after the first-stage longitudinal stretching. This coating liquid has a secondary transition point of 20.
It contains a polyester resin of ˜150 ° C. and a filler (fine particles).

【0021】このポリエステル樹脂は分子内に親水性基
を有することが好ましい。この親水性基としては、スル
ホン酸塩基、カルボン酸塩基、ポリエーテル基等が挙げ
られる。ポリエステル樹脂の具体例としては、テレフタ
ル酸―イソフタル酸―5―Kスルホイソフタル酸―エチ
レングリコール―ネオペンチルグリコール共重合ポリエ
ステル、2,6―ナフタレンジカルボン酸―イソフタル
酸―5―Naスルホイソフタル酸―エチレングリコール
―ビスフェノールA・アルキレンオキシド付加物共重合
ポリエステル、テレフタル酸―イソフタル酸―エチレン
グリコール―ジメチロールプロピオン塩アミン塩―ジエ
チレングリコール共重合ポリエステル等を好ましく挙げ
ることができる。
This polyester resin preferably has a hydrophilic group in the molecule. Examples of this hydrophilic group include a sulfonate group, a carboxylate group, and a polyether group. Specific examples of the polyester resin include terephthalic acid-isophthalic acid-5-K sulfoisophthalic acid-ethylene glycol-neopentyl glycol copolymerized polyester, 2,6-naphthalenedicarboxylic acid-isophthalic acid-5-Nasulfoisophthalic acid-ethylene. Preferable examples include glycol-bisphenol A / alkylene oxide adduct copolymerized polyester, terephthalic acid-isophthalic acid-ethylene glycol-dimethylolpropion salt amine salt-diethylene glycol copolymerized polyester, and the like.

【0022】このポリエステル樹脂の二次転移点は20
〜150℃であるが、好ましくは40〜130℃であ
る。この二次転移点が20℃未満ではフイルムがブロッ
キングしやすく、一方150℃を超えると延伸性が劣
り、表面が粗れる。
The second-order transition point of this polyester resin is 20.
The temperature is up to 150 ° C, preferably 40 to 130 ° C. If the second-order transition point is lower than 20 ° C, the film tends to be blocked, while if it exceeds 150 ° C, the stretchability is poor and the surface is rough.

【0023】前記微粒子としては、無機物、有機物いず
れでもよい。シリカ、炭酸カルシウム、酸化カルシウ
ム、アルミナ、カオリン、酸化チタン、架橋アクリル樹
脂、架橋ポリスチレン、シリコーン樹脂、カーボンブラ
ック、酸化錫、等の微粒子を好ましく例示することがで
きる。
The fine particles may be either inorganic or organic. Fine particles of silica, calcium carbonate, calcium oxide, alumina, kaolin, titanium oxide, crosslinked acrylic resin, crosslinked polystyrene, silicone resin, carbon black, tin oxide and the like can be preferably exemplified.

【0024】かかる微粒子は平均粒径が0.01〜0.
1μmである必要がある。好ましい平均粒径は0.01
5〜0.05μmである。この平均粒径が0.01μm
未満ではフイルムの滑り性が劣り、工程特性が悪くな
り、一方0.1μmを超えると微粒子が脱落したり、フ
イルム表面が粗れすぎるので、好ましくない。
The fine particles have an average particle diameter of 0.01 to 0.
It must be 1 μm. The preferred average particle size is 0.01
It is 5 to 0.05 μm. This average particle size is 0.01 μm
When it is less than 0.1 μm, the slipperiness of the film is poor and the process characteristics are deteriorated. On the other hand, when it exceeds 0.1 μm, fine particles fall off or the film surface is too rough, which is not preferable.

【0025】ポリエステル樹脂と微粒子の配合割合は、
ポリエステル樹脂80〜99重量%、微粒子20〜1重
量%の割合である。微粒子の割合が1重量%未満では、
フイルムの滑りが不足し工程特性が低下するし、一方2
0重量%を超えると粒子が多すぎて脱落しやすくなる。
The mixing ratio of the polyester resin and the fine particles is
The ratio is 80 to 99% by weight of polyester resin and 20 to 1% by weight of fine particles. When the proportion of fine particles is less than 1% by weight,
Film slippage is insufficient and process characteristics deteriorate, while 2
If it exceeds 0% by weight, the amount of particles is too large and the particles are likely to fall off.

【0026】本発明における易接着水性塗液には、ポリ
エステルフイルムへの濡れ性を向上させるために濡れ剤
を含有させてもよい。濡れ剤としては、アニオン型界面
活性剤、カチオン型界面活性剤、ノニオン型界面活性剤
等の界面活性剤があり、例えばポリエチレンオキサイド
・ポリプロピレンオキサイドブロック共重合体、ポリオ
キシエチレンアルキルフェニルエーテル、ポリオキシエ
チレン―脂肪酸エステル、ソルビタン脂肪酸エステル、
グリセリン脂肪酸エステル、脂肪酸金属石鹸、アルカン
スルホン酸塩、アルキル硫酸塩、アルキルベンゼンスル
ホン酸塩、アルキルスルホン酸塩、アルキルジフェニー
ルエーテルジスルホン酸塩、アルキルスルホコハク酸
塩、第4級アンモニウムクロライド塩、アルキルアミン
塩酸等を挙げることができる。濡れ剤の量としては、塗
液中の全固形分の2〜30重量%が好ましく、より好ま
しくは3〜20重量%である。
The easily-adhesive aqueous coating liquid in the present invention may contain a wetting agent in order to improve the wettability to the polyester film. As the wetting agent, there are surfactants such as anionic surfactants, cationic surfactants and nonionic surfactants, and examples thereof include polyethylene oxide / polypropylene oxide block copolymers, polyoxyethylene alkylphenyl ethers, polyoxy Ethylene-fatty acid ester, sorbitan fatty acid ester,
Glycerin fatty acid ester, fatty acid metal soap, alkane sulfonate, alkyl sulfate, alkyl benzene sulfonate, alkyl sulfonate, alkyl diphenyl ether disulfonate, alkyl sulfosuccinate, quaternary ammonium chloride salt, alkyl amine hydrochloride Etc. can be mentioned. The amount of the wetting agent is preferably 2 to 30% by weight, and more preferably 3 to 20% by weight of the total solid content in the coating liquid.

【0027】更に本発明の効果を消失させない範囲にお
いて、例えば帯電防止剤、紫外線吸収剤、顔料、有機フ
ィラー、無機フィラー、潤滑剤、ブロッキング防止剤、
メラミン、エポキシ、アジリジン等の架橋剤等の他の添
加剤、及びアクリル系樹脂、ポリウレタン樹脂等の単独
又はブレンド物を混合することができる。
Further, within a range that does not impair the effects of the present invention, for example, an antistatic agent, an ultraviolet absorber, a pigment, an organic filler, an inorganic filler, a lubricant, an antiblocking agent,
Other additives such as a cross-linking agent such as melamine, epoxy and aziridine, and an acrylic resin, a polyurethane resin and the like can be mixed alone or as a blend.

【0028】水性塗液の固形分濃度は、通常30重量%
以下であり、10重量%以下が更に好ましい。塗布量は
走行しているフイルム1m2 当り0.5〜20g、さら
には1〜10gが好ましい。
The solid content concentration of the aqueous coating liquid is usually 30% by weight.
It is below, and more preferably 10% by weight or less. The coating amount is preferably 0.5 to 20 g, and more preferably 1 to 10 g per 1 m 2 of the running film.

【0029】塗布方法としては、公知の任意の塗布法が
適用できる。例えばロールコート法、グラビアコート
法、リバースコート法、ロールブラッシュ法、スプレー
コート法、エアーナイフコート法、含浸法及びカーテン
コート法などを単独又は組み合わせて適用するとよい。
この水性塗液には、塗液の安定性又は塗液の塗布性を助
ける目的で若干量の有機溶剤を含んでもよい。塗布はフ
イルムの片面又は両面に通用できる。
As a coating method, any known coating method can be applied. For example, a roll coating method, a gravure coating method, a reverse coating method, a roll brushing method, a spray coating method, an air knife coating method, an impregnation method and a curtain coating method may be applied alone or in combination.
The aqueous coating liquid may contain a small amount of an organic solvent for the purpose of assisting the stability of the coating liquid or the coating property of the coating liquid. The coating can be applied to one side or both sides of the film.

【0030】水性塗液を塗布した縦一段延伸ポリエステ
ルフイルムは、乾燥され、横延伸、再縦延伸、熱固定等
の工程に導かれる。例えば水性塗液を塗布した縦一段延
伸ポリエステルフイルムは、ステンターに導かれて横延
伸、再縦延伸及び熱固定される。この間塗布液は乾燥
し、フイルム上に皮膜を形成する。乾燥は横延伸前或い
は横延伸時に行なうと良い。
The longitudinal single-stage stretched polyester film coated with the aqueous coating solution is dried and introduced into the steps such as transverse stretching, re-longitudinal stretching and heat setting. For example, a longitudinal single-stage stretched polyester film coated with an aqueous coating liquid is introduced into a stenter and transversely stretched, re-longitudinal stretched and heat set. During this period, the coating liquid dries to form a film on the film. Drying may be performed before or during transverse stretching.

【0031】このようにして得られるプライマー層(易
接着層)を有する高強度ポリエステルフイルムの塗膜の
厚さ(乾燥)は0.005〜0.03μmである必要が
ある。この厚さが0.005μm未満では接着性が劣
り、一方0.03μmを超えると表面が粗れたり、工程
で削れ転写が起こしやすくなり、好ましくない。特にバ
インダーのポリエステル樹脂の二次転移点が高い場合に
膜厚の増大と共に表面粗さが増大する。
The thickness (dry) of the coating film of the high-strength polyester film having the primer layer (easy adhesion layer) thus obtained must be 0.005 to 0.03 μm. If the thickness is less than 0.005 μm, the adhesion is poor, while if it exceeds 0.03 μm, the surface is roughened and the transfer is likely to occur due to scraping in the process, which is not preferable. Particularly when the polyester resin of the binder has a high second-order transition point, the surface roughness increases as the film thickness increases.

【0032】このようにして得られる易接着層(プライ
マー層)を有する高硬度ポリエステルフイルムは高強度
の特徴とともに種々の被覆物例えばセロファン用イン
キ、磁性塗料、電子写真用トナー組成物、ケミカルマッ
ト塗料、ジアゾ塗料、UVインキ等の極めて広汎な塗料
に対して高い接着性を示し、特に磁性塗料に強い接着性
を示し、かつ粘着性のない良好な耐ブロッキング性を示
す。
The high-hardness polyester film having an easily adhesive layer (primer layer) thus obtained has various characteristics such as high strength and various coating materials such as cellophane ink, magnetic paint, electrophotographic toner composition and chemical mat paint. It exhibits high adhesion to a wide variety of paints such as diazo paints and UV inks, particularly strong adhesion to magnetic paints, and good blocking resistance without tackiness.

【0033】[0033]

【実施例】以下、実施例を挙げて本発明を更に説明す
る。なお、例中の「部」は「重量部」を意味する。また
フイルムの各特性は次の方法で測定した。
EXAMPLES The present invention will be further described below with reference to examples. In addition, "part" in an example means a "weight part." Each characteristic of the film was measured by the following method.

【0034】1.接着性 プライマー被覆ポリエステルフイルムに評価塗料をマイ
ヤーバーで乾燥後の厚さが約4μmになるように塗布
し、100℃で3分間乾燥する。その後60℃で24時
間エージングし、次いでスコッチテープNo.600(3
M社製)巾12.7mm、長さ15cmを気泡の入らな
いように粘着し、この上をJIS C2701(197
5)記載の手動式荷重ロールでならし、密着させ、テー
プ巾に切り出す。これを180度剥離した時の強力を測
定する。 [評価用塗料]固形分換算で、 ウレタン樹脂 ニッポラン2304 25部 (日本ポリウレタン製) 塩ビ・酢ビ樹脂 エスレックA 50部 (積水化学製) 分散剤 レシオンP 1部 (理研ビタミン製) 磁性剤 CTX―860 500部 (戸田化学製) をメチルエチルケトン/トルエン/シクロヘキサノン混
合溶剤に溶解し、40%にし、サンドグラインダーで2
時間分散する。その後架橋剤のコロネートL 25部
(固形分換算)を添加し、よく撹拌して磁性塗料を得
る。
1. Adhesiveness The evaluation coating material is applied to the primer-coated polyester film with a Meyer bar so that the thickness after drying is about 4 μm, and dried at 100 ° C. for 3 minutes. Then, it was aged at 60 ° C. for 24 hours, and then Scotch tape No. 600 (3
Adhesive with a width of 12.7 mm and a length of 15 cm so that air bubbles do not enter, and the top of this is JIS C2701 (197).
5) Level with a manual load roll described in (3), bring it into close contact, and cut into a tape width. The strength when peeled at 180 degrees is measured. [Evaluation paint] Urethane resin Nipporan 2304 25 parts (manufactured by Nippon Polyurethane) PVC / vinyl acetate resin S-REC A 50 parts (manufactured by Sekisui Chemical) Dispersant Resion P 1 part (manufactured by RIKEN VITAMINS) Magnetic agent CTX- 860 500 parts (manufactured by Toda Kagaku Co., Ltd.) is dissolved in a mixed solvent of methyl ethyl ketone / toluene / cyclohexanone to make it 40%, and the mixture is sanded with a sand grinder.
Disperse in time. After that, 25 parts (in terms of solid content) of Coronate L as a cross-linking agent is added and well stirred to obtain a magnetic paint.

【0035】2.ポリエステルの二次転移点(Tg) セイコー電子工業(株)SSC/580DS型DSCを
用いて二次転移点を測定する。約10mgの試料をアル
ミ製ボルターに封じ込め、一度DSCで溶融し、続いて
徐冷後0℃まで冷却した後本測定に入る。10℃/mi
nの速度で昇温しながら熱量変化を測定し、この変化か
らTgを求める。
2. Second-order transition point (Tg) of polyester The second-order transition point is measured by using SSC / 580DS type DSC manufactured by Seiko Instruments Inc. Approximately 10 mg of the sample is enclosed in an aluminum bolter, once melted by DSC, then gradually cooled and cooled to 0 ° C., and then the main measurement is started. 10 ° C / mi
The change in the amount of heat is measured while increasing the temperature at a rate of n, and Tg is determined from this change.

【0036】3.ブロッキング性 ポリエステルフイルムの表面と裏面を合わせてから10
cm×15cm角に切り、これに50℃で50%RHの
雰囲気中で17時間、50kg/cm2 の加重をかけ、
次いでこの10cm巾の剥離強度を測定する。このとき
の剥離スピードは100mm/分である。
3. Blocking property 10 after putting the front and back of the polyester film together
Cut into squares of 15 cm × 15 cm, and apply a load of 50 kg / cm 2 at 50 ° C. in an atmosphere of 50% RH for 17 hours.
Then, the peel strength of this 10 cm width is measured. The peeling speed at this time is 100 mm / min.

【0037】4.表面滑り性(フイルムスリッパー) ASTM D 1894―63に準じ、東洋テスター社
製のスリッパリー測定器を使用し、静摩擦係数(μs)
を測定する。但し、スレッド板はガラス板とし、荷重は
1kgとする。
4. Surface slipperiness (film slipper) According to ASTM D 1894-63, using a slippery measuring device manufactured by Toyo Tester, static friction coefficient (μs)
To measure. However, the thread plate is a glass plate and the load is 1 kg.

【0038】5.表面粗さ Ra(Center Line Average :中心線平均粗さ) JIS B0601に準じ、(株)小坂研究所製の高精
度表面粗さ計SE―3FATを使用して、針の半径2μ
m、荷重30mgで拡大倍率20万倍、カットオフ0.
08mmの条件下にチャートをかかせ、フイルム表面粗
さ曲線からその中心線の方向に測定長さLの部分を抜き
取り、この抜き取り部分の中心線をX軸、縦倍率の方向
をY軸として、粗さ曲線をY=f(x)で表わしたと
き、次の式であたえられた値をμm単位で表わす。
5. Surface roughness Ra (Center Line Average) In accordance with JIS B0601, using a high precision surface roughness meter SE-3FAT manufactured by Kosaka Laboratory Ltd., the radius of the needle is 2μ.
m, load 30 mg, magnification 200,000 times, cutoff 0.
A chart is placed under the condition of 08 mm, a portion of the measurement length L is extracted from the film surface roughness curve in the direction of its center line, the center line of the extracted portion is taken as the X axis, and the longitudinal magnification direction is taken as the Y axis. When the roughness curve is expressed by Y = f (x), the value given by the following formula is expressed in μm.

【0039】[0039]

【数1】 [Equation 1]

【0040】この測定は基準長を1.25mmとして4
個行い、その平均値で表わす。
In this measurement, the standard length is 1.25 mm and 4
It is done individually and expressed as the average value.

【0041】[0041]

【実施例1】固有粘度が0.64のポリエチレンテレフ
タレート(滑剤含有)を溶融押出して未延伸シートをつ
くり、縦方向に2.1倍延伸した。続いて得られた縦一
軸延伸フイルムの片面に、テレフタル酸―イソフタル酸
―5―Naスルホイソフタル酸―エチレングリコール―
ネオペンチルグリコール共重合ポリエステル(二次転移
点75℃)90wt%、平均粒径0.03μmの架橋ア
クリル樹脂微粒子7wt%及びポリエチレンオキシドノ
ニルフェニルエーテル3wt%の固形分からなる4%水
性塗液をキスコート法で塗布した。次いで横方向に3.
8倍延伸した後、120℃で再度縦方向に2倍延伸し、
220℃で熱固定した。得られたフイルムの厚さは9μ
mで、塗膜厚さは0.02μmであった。このフイルム
の特性を表1に示す。
Example 1 Polyethylene terephthalate (containing a lubricant) having an intrinsic viscosity of 0.64 was melt-extruded to prepare an unstretched sheet, which was stretched 2.1 times in the machine direction. Then, on one side of the longitudinally uniaxially stretched film obtained, terephthalic acid-isophthalic acid-5-Na sulfoisophthalic acid-ethylene glycol-
A 4% aqueous coating solution consisting of 90% by weight of neopentyl glycol copolyester (secondary transition point 75 ° C.), 7% by weight of crosslinked acrylic resin fine particles having an average particle size of 0.03 μm, and 3% by weight of polyethylene oxide nonyl phenyl ether is kiss coated. Was applied. Then in the lateral direction 3.
After stretching 8 times, it is again stretched 2 times in the machine direction at 120 ° C.,
It was heat set at 220 ° C. The thickness of the obtained film is 9μ
m, the coating thickness was 0.02 μm. The characteristics of this film are shown in Table 1.

【0042】[0042]

【比較例1】水性塗液を塗布しなかった以外は、実施例
1と全く同様の方法でプレーンの再縦延伸フイルムを得
た。このフイルムの特性を表1に示す。
COMPARATIVE EXAMPLE 1 A plain longitudinal re-stretched film was obtained in the same manner as in Example 1 except that the aqueous coating liquid was not applied. The characteristics of this film are shown in Table 1.

【0043】[0043]

【実施例2】固有粘度が0.64のポリエチレンテレフ
タレートを溶融押出して未延伸シートをつくり、縦方向
に2.3倍延伸した。続いて得られた縦一軸延伸フイル
ムの片面に、テレフタル酸―イソフタル酸―5―Kスル
ホイソフタル酸―エチレングリコール―1,4―ブタン
ジオール共重合ポリエステル(二次転移点76℃)90
wt%、平均粒径0.03μmのシリカ6wt%及びポ
リエチレンオキシドノニルフェニルエーテル4wt%の
固形分からなる4%水性塗液をキスコート法で塗布し
た。次いで横方向に3.7倍延伸した後、120℃で再
度縦方向に2.2倍延伸し、230℃で熱固定した。得
られたフイルムの厚さは10μmで、塗膜厚さは0.0
17μmであった。このフイルムの特性を表1に示す。
Example 2 Polyethylene terephthalate having an intrinsic viscosity of 0.64 was melt extruded to form an unstretched sheet, which was stretched 2.3 times in the machine direction. Subsequently, terephthalic acid-isophthalic acid-5-K sulfoisophthalic acid-ethylene glycol-1,4-butanediol copolymerized polyester (secondary transition point 76 ° C) 90 was formed on one surface of the longitudinally uniaxially stretched film obtained.
A 4% aqueous coating liquid consisting of 6% by weight of silica having an average particle diameter of 0.03 μm and 4% by weight of polyethylene oxide nonylphenyl ether was applied by a kiss coating method. Then, after stretching 3.7 times in the transverse direction, it was stretched again 2.2 times in the longitudinal direction at 120 ° C. and heat set at 230 ° C. The resulting film has a thickness of 10 μm and a coating thickness of 0.0
It was 17 μm. The characteristics of this film are shown in Table 1.

【0044】[0044]

【実施例3〜6、比較例2〜4】実施例1において塗膜
厚さを変えること以外は同様にして得た結果を表1に示
す。
Examples 3 to 6 and Comparative Examples 2 to 4 Table 1 shows the results obtained in the same manner as in Example 1 except that the coating thickness was changed.

【0045】[0045]

【表1】 [Table 1]

【0046】[0046]

【発明の効果】本発明によれば、その製造過程でフイル
ムの滑りを良くし、熱ロール接触時の塗膜の転写を抑止
すると共にフイルムに塗布される種々の被覆物、例えば
磁性塗料に対し優れた接着性を有する高強度ポリエステ
ルフイルムの製造方法を提供することができる。
EFFECTS OF THE INVENTION According to the present invention, the film is made slippery during the manufacturing process thereof, the transfer of the coating film is suppressed at the time of contact with a hot roll, and various coatings applied to the film, for example, magnetic coatings are applied. It is possible to provide a method for producing a high-strength polyester film having excellent adhesiveness.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B29L 9:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29L 9:00

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 酸成分の70モル%以上がテレフタル酸
及び/又はナフタレンジカルボン酸からなるポリエステ
ルの縦延伸フイルムの少なくとも片面に、二次転移点が
20〜150℃のポリエステル樹脂99〜80重量%と
平均粒径0.01〜0.1μmの微粒子1〜20重量%
とを含む易接着水性塗液を最終的塗膜厚みが0.005
〜0.03μmとなる量塗布し、次いで乾燥及び横方向
の延伸を施し、更に縦方向へ再延伸し、要すれば横方向
の再延伸を行い、しかる後熱固定を施すことからなる易
接着性高強度ポリエステルフイルムの製造方法。
1. A polyester resin having a second-order transition point of 20 to 150 ° C. and a weight ratio of 99 to 80% by weight on at least one side of a longitudinally stretched film of polyester in which 70 mol% or more of an acid component is terephthalic acid and / or naphthalenedicarboxylic acid. And 1 to 20% by weight of fine particles having an average particle diameter of 0.01 to 0.1 μm
An easily-adhesive aqueous coating solution containing
Approximately 0.03 μm is applied, then dried and stretched in the transverse direction, re-stretched in the longitudinal direction, if necessary, re-stretched in the lateral direction, and then heat-fixed for easy adhesion. For producing high strength and high strength polyester film.
【請求項2】 ポリエステルがポリエチレンテレフタレ
ートまたはポリエチレン―2,6―ナフタレンジカルボ
キシレートである請求項1記載の易接着性高強度ポリエ
ステルフイルムの製造方法。
2. The method for producing an easily-adhesive high-strength polyester film according to claim 1, wherein the polyester is polyethylene terephthalate or polyethylene-2,6-naphthalene dicarboxylate.
【請求項3】 ポリエステル樹脂が分子内にスルホン酸
塩基又はカルボン酸塩基を有するポリエステル樹脂であ
る請求項1記載の易接着性高強度ポリエステルフイルム
の製造方法。
3. The method for producing an easily-adhesive high-strength polyester film according to claim 1, wherein the polyester resin is a polyester resin having a sulfonate group or a carboxylate group in the molecule.
JP18801693A 1993-07-29 1993-07-29 Method for producing easily adhesive high strength polyester film Expired - Fee Related JP3270205B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18801693A JP3270205B2 (en) 1993-07-29 1993-07-29 Method for producing easily adhesive high strength polyester film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18801693A JP3270205B2 (en) 1993-07-29 1993-07-29 Method for producing easily adhesive high strength polyester film

Publications (2)

Publication Number Publication Date
JPH0741584A true JPH0741584A (en) 1995-02-10
JP3270205B2 JP3270205B2 (en) 2002-04-02

Family

ID=16216188

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18801693A Expired - Fee Related JP3270205B2 (en) 1993-07-29 1993-07-29 Method for producing easily adhesive high strength polyester film

Country Status (1)

Country Link
JP (1) JP3270205B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08309910A (en) * 1995-05-19 1996-11-26 Kimoto & Co Ltd Transparent hard coat film
JP2000272003A (en) * 1999-01-21 2000-10-03 Toyobo Co Ltd Biaxially oriented polyester film and roll
JP2004027126A (en) * 2002-06-27 2004-01-29 Toray Coatex Co Ltd Wet film laminated sheet and abrasive pad using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08309910A (en) * 1995-05-19 1996-11-26 Kimoto & Co Ltd Transparent hard coat film
JP2000272003A (en) * 1999-01-21 2000-10-03 Toyobo Co Ltd Biaxially oriented polyester film and roll
JP2004027126A (en) * 2002-06-27 2004-01-29 Toray Coatex Co Ltd Wet film laminated sheet and abrasive pad using the same

Also Published As

Publication number Publication date
JP3270205B2 (en) 2002-04-02

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