JPH10292289A - Thin porous paper - Google Patents
Thin porous paperInfo
- Publication number
- JPH10292289A JPH10292289A JP9097249A JP9724997A JPH10292289A JP H10292289 A JPH10292289 A JP H10292289A JP 9097249 A JP9097249 A JP 9097249A JP 9724997 A JP9724997 A JP 9724997A JP H10292289 A JPH10292289 A JP H10292289A
- Authority
- JP
- Japan
- Prior art keywords
- para
- aramid
- fiber
- paper
- thin
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Filtering Materials (AREA)
- Paper (AREA)
- Cell Separators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐熱性、耐薬品
性、突き刺し強度に優れ、かつピンホールの少ない多孔
性紙に関するもので、産業用の利用分野としてはフィル
ター用紙、電池用セパレーター用紙などに適する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous paper having excellent heat resistance, chemical resistance, piercing strength and few pinholes, and has a wide range of industrial applications such as filter paper and battery separator paper. Suitable for.
【０００２】[0002]
【従来の技術】従来、強度、耐熱性、寸法安定性に優れ
た紙としてアラミド系繊維を使用した合成紙が製造され
てきた。アラミド系の中でも、特にパラアラミド繊維は
耐熱性、耐薬品性等が優れているため、プリント配線
板、ハニカム構造体などへの使用が検討されてきた。2. Description of the Related Art Conventionally, synthetic paper using aramid fiber has been manufactured as paper having excellent strength, heat resistance and dimensional stability. Among para-aramid fibers, para-aramid fibers are particularly excellent in heat resistance, chemical resistance and the like, and their use in printed wiring boards, honeycomb structures and the like has been studied.
【０００３】アラミド系繊維を使用したシートの製造に
関しては、特開平７−３６９３号公報に開示されている
ように、水で膨潤されたパラ系芳香族ポリアミドの短繊
維、ステープル、パルプ及び粒状ポリマーを抄紙し、加
圧下で乾燥してパラアラミドのみからなる紙を得る方法
や、特開平５−１０６１９１号公報に開示されているよ
うに、芳香族ポリアミド短繊維と繊維径０.７μｍ以下
の芳香族ポリアミドのミクロフィブリルからなる２成
分、またはこれに繊維径０.７μｍより大きなパルプ状
芳香族ポリアミドを加えた耐熱紙などの技術が提案され
ているが、これらの技術では、極薄紙であって突き刺し
強度に優れ、かつピンホールの少ない紙を得ることは困
難であった。[0003] With respect to the production of sheets using aramid fibers, as disclosed in Japanese Patent Application Laid-Open No. 7-3693, short fibers, staples, pulp and granular polymer of para-aromatic polyamide swollen with water are disclosed. And drying under pressure to obtain a paper comprising only para-aramid, or as disclosed in JP-A-5-106191, an aromatic polyamide short fiber and an aromatic fiber having a fiber diameter of 0.7 μm or less. Techniques such as heat-resistant paper in which two components consisting of polyamide microfibrils or a pulp-like aromatic polyamide having a fiber diameter of more than 0.7 μm have been proposed have been proposed. It was difficult to obtain paper having excellent strength and few pinholes.
【０００４】一方、バッテリーセパレーターや耐熱フィ
ルター等の分野においては、より高性能を求めることか
ら、耐熱性、耐薬品性があり、微細多孔質構造であっ
て、かつ突き刺し強度の高い、極薄の多孔性シートが要
求されている。On the other hand, in the fields of battery separators, heat-resistant filters, etc., in order to obtain higher performance, ultra-thin, heat-resistant and chemical-resistant microporous structures having high piercing strength are required. There is a need for a porous sheet.
【０００５】これらの特性は例えばバッテリーセパレー
ターにおいては電極より発生するデントライトによるシ
ョートを防ぐことに有効であり、またフィルター用紙に
おいては、ダスト粒子の濾過の際の破裂防止に有効であ
る。かかる要求を満たす材料としてパラアラミド繊維が
有望であるが、薄物紙においては、突き刺し強度を高く
維持することははなはだ困難であった。[0005] These characteristics are effective, for example, in battery separators to prevent short-circuits due to dendrites generated from the electrodes, and in filter paper, they are effective in preventing rupture of dust particles during filtration. Although a para-aramid fiber is promising as a material satisfying such requirements, it has been extremely difficult to maintain high piercing strength in thin paper.
【０００６】[0006]
【発明が解決しようとする課題】パラアラミド短繊維の
配合は、一般に強度を高める作用があるが、フィブリル
化パルプに比べて繊維径が太いため、孔径の増大を招
き、ピンホールを発生しやすい。このように突き刺し強
度と最大孔径(ピンホール発生頻度)は相反する傾向があ
り、上記に開示された技術では、この困難を解決するも
のではなかった。The blending of para-aramid short fibers generally has the effect of increasing the strength, but since the fiber diameter is larger than that of fibrillated pulp, the pore diameter is increased and pinholes are liable to occur. As described above, the piercing strength and the maximum hole diameter (the frequency of occurrence of pinholes) tend to be contradictory, and the technique disclosed above has not solved this difficulty.
【０００７】[0007]
【課題を解決するための手段】かかる状況に鑑み、本発
明者らは、各種フリーネスのパラアラミドパルプと、各
種繊維径、繊維長のパラアラミド短繊維の配合を検討し
た結果、３５μｍ以下の極薄仕様においても、十分な突
き刺し強度を有し、かつピンホールの非常に少ない薄葉
多孔紙を得るに至った。In view of this situation, the present inventors have studied the blending of para-aramid pulp having various freenesses and para-aramid short fibers having various fiber diameters and fiber lengths. Even in the specifications, thin-leaf perforated paper having sufficient piercing strength and having very few pinholes was obtained.
【０００８】すなわち本発明は、フリーネス２０〜２５
０ｍｌのパラアラミドパルプと繊維径０.８〜３デニー
ル、繊維長３〜１５ｍｍのパラアラミド短繊維と熱硬化
性樹脂からなる厚さ３５μｍ以下の紙であり、パラアラ
ミド短繊維とパラアラミドパルプの合計を１００重量部
として、パラアラミド短繊維の比率は１５〜６０重量部
であることを特徴とする薄葉多孔紙に関するものであ
る。That is, the present invention provides a freeness of 20 to 25.
It is a paper having a thickness of 35 μm or less, which is composed of 0 ml of para-aramid pulp, a fiber diameter of 0.8 to 3 denier, para-aramid short fiber having a fiber length of 3 to 15 mm, and a thermosetting resin. The present invention relates to a thin-leaf perforated paper characterized in that the ratio of the para-aramid short fibers is 15 to 60 parts by weight as 100 parts by weight.
【０００９】また、本発明の第２の発明は、最大孔径が
２０μｍ以下である、上記発明の薄様多孔紙に関するも
のである。[0009] The second invention of the present invention relates to the thin porous paper of the above invention, having a maximum pore diameter of 20 µm or less.
【００１０】[0010]
【発明の実施の形態】以下本発明についてさらに詳細に
説明する。本発明においてパラアラミドパルプはパラア
ラミド繊維をフリーネスが２０〜２５０ｍｌになるよう
に叩解したものである。これにより、アラミドパルプは
繊維径１μｍ以下の微細繊維を多量に含むことになり、
微細な孔径のネットワーク形成がなされる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. In the present invention, para-aramid pulp is obtained by beating para-aramid fibers so that the freeness becomes 20 to 250 ml. Thereby, aramid pulp will contain a large amount of fine fibers having a fiber diameter of 1 μm or less,
A network with a fine pore size is formed.
【００１１】アラミドパルプフリーネスが２５０ｍｌを
越えるとアラミドパルプの繊維径が太くなるために孔径
を微小に維持できなくなり、また、薄いシートも形成し
にくくなる。アラミドパルプフリーネスが２０ｍｌに満
たないと過剰なミクロフィブリル化をもたらし、強度面
および湿式抄紙面で不利益である。When the aramid pulp freeness exceeds 250 ml, the fiber diameter of the aramid pulp becomes large, so that it becomes impossible to maintain a fine pore diameter and it is difficult to form a thin sheet. If the aramid pulp freeness is less than 20 ml, excessive microfibrillation occurs, which is disadvantageous in strength and wet papermaking.
【００１２】本発明においては、必要に応じてフリーネ
ス２５０ｍｌ以上のパラアラミドパルプを併用すること
はさしつかえない。叩解設備としては、リファイナー、
ビーター等を使用することができる。叩解により得られ
たパラアラミドパルプとパラアラミド短繊維を配合し、
突き刺し強度を改善する。In the present invention, it is possible to use para-aramid pulp having a freeness of 250 ml or more as needed. Refining equipment,
A beater or the like can be used. Combining para-aramid pulp and para-aramid short fibers obtained by beating,
Improves piercing strength.
【００１３】本発明に用いるパラアラミド短繊維の繊維
径は０.８〜３デニールが適当である。繊維径が３デニ
ールを越えると繊維間の接点形成が少なくなり、薄いシ
ート形成が困難になる。そのうえ抄造時の微細パラアラ
ミドパルプの保持性が悪くなり、ピンホールも発生す
る。また０．８デニールに満たないと繊維径が細すぎて
十分な突き刺し強度を維持することができない。一方、
繊維長は３〜１５ｍｍが適当である。繊維長が３ｍｍに
満たないと突き刺し強度の改善効果が得られず、１５ｍ
ｍを越えるととシートの均一性をくずすので好ましくな
い。The fiber diameter of the para-aramid short fibers used in the present invention is suitably 0.8 to 3 denier. If the fiber diameter exceeds 3 denier, the formation of contact points between the fibers decreases, and it becomes difficult to form a thin sheet. In addition, the retention of the fine para-aramid pulp during papermaking deteriorates, and pinholes also occur. On the other hand, if it is less than 0.8 denier, the fiber diameter is too small to maintain a sufficient piercing strength. on the other hand,
The fiber length is suitably 3 to 15 mm. If the fiber length is less than 3 mm, the effect of improving the piercing strength cannot be obtained, and
If it exceeds m, the uniformity of the sheet is lost, which is not preferable.
【００１４】パラアラミド短繊維の配合比率は、パラア
ラミド短繊維とパラアラミドパルプの合計を１００重量
部として、１５〜６０重量部が適当である。配合率が６
０重量部を越えると、ピンホールを生じ、均一なシート
が得られない。また１５重量部に満たないと突き刺し強
度を改善しない。The mixing ratio of the para-aramid short fibers is preferably 15 to 60 parts by weight based on 100 parts by weight of the total of the para-aramid short fibers and the para-aramid pulp. Mixing ratio is 6
If the amount exceeds 0 parts by weight, pinholes are generated, and a uniform sheet cannot be obtained. If the amount is less than 15 parts by weight, the piercing strength is not improved.
【００１５】本発明のシートはバインダーとして熱硬化
性樹脂を必要とするが、エポキシ樹脂、アクリル樹脂、
フェノール樹脂、メラミン樹脂、ポリイミド樹脂、フラ
ン樹脂等の熱硬化性樹脂が適し、また、この他の熱硬化
性樹脂でもよい。[0015] The sheet of the present invention requires a thermosetting resin as a binder.
Thermosetting resins such as phenolic resins, melamine resins, polyimide resins, and furan resins are suitable, and other thermosetting resins may be used.
【００１６】熱硬化性樹脂はパラアラミド短繊維とパラ
アラミドパルプの合計を１００重量部として５〜５０重
量部加えられる。熱硬化性樹脂の添加の方式、添加場所
は限定されず、例えば抄紙前のパラアラミドパルプとパ
ラアラミド短繊維のスラリーに、樹脂粉末もしくは樹脂
繊維の形で抄き込む方法でもよいし、抄紙後あるいはそ
の後のシートの加工時にエマルジョンや水溶液、もしく
は溶剤ワニス等を含浸したり、スプレー添加する方式で
もよい。The thermosetting resin is added in an amount of 5 to 50 parts by weight based on 100 parts by weight of the total of the para-aramid short fibers and the para-aramid pulp. The method of adding the thermosetting resin, the place of addition is not limited, and for example, a method of forming a slurry of para-aramid pulp and para-aramid short fibers before papermaking, a method of forming the resin powder or resin fibers, or a method after papermaking or A method of impregnating an emulsion, an aqueous solution, a solvent varnish, or the like at the time of processing the subsequent sheet, or adding a spray may be used.
【００１７】上記条件にてシート化したものを熱キャレ
ンダー処理することにより、更に強度は高まる。熱風ド
ライヤーなどでバインダーの硬化度を高めることも有効
である。熱キャレンダー処理の温度はバインダーの溶融
・硬化特性により異なるが、一般には１５０℃〜３５０
℃である。また必要により、熱キャレンダー後に熱硬化
性樹脂を含浸させ、キュアーを行うこともできる。さら
に熱キャレンダーのみではキュアーが不十分な場合、何
等かの方法で追加のキュアーを行うこともできる。By subjecting the sheet formed under the above conditions to a heat calendering treatment, the strength is further increased. It is also effective to increase the degree of curing of the binder with a hot air dryer or the like. Although the temperature of the heat calendering treatment varies depending on the melting and curing characteristics of the binder, it is generally 150 ° C.
° C. If necessary, curing can be performed by impregnating with a thermosetting resin after the thermal calendering. In addition, if the heat calender alone is insufficient for curing, additional curing may be performed by any method.
【００１８】本発明の第２の発明は、最大孔径を２０μ
ｍ下とすることである。最大孔径が２０μｍより大きい
場合、ピンホールとなり、多孔性紙の用途に不具合を生
じる。According to a second aspect of the present invention, the maximum pore size is set to 20 μm.
m below. If the maximum pore size is larger than 20 μm, pinholes occur, which causes problems in the use of porous paper.
【００１９】[0019]
【実施例】以下に本発明を実施例及び比較例によって更
に詳細に説明する。本発明の内容は実施例に限定される
ものではない。The present invention will be described below in more detail with reference to Examples and Comparative Examples. The content of the present invention is not limited to the examples.
【００２０】以下の実施例、比較例において示す最大孔
径はA.S.T.M.F-316-80に準拠し、コールターポロメータ
ー２を使用して測定した。また、突き刺し強度はレトル
トパウチ食品の日本農林規格(昭和６３年４月２５日
農林水産省告示第５４０号)に準拠し、直径１.０ｍｍ、
先端形状０.５ｍｍＲの針を５０±５ｍｍ/分の速度で突
き刺し、針が貫通したときの強度を測定した。The maximum pore size shown in the following Examples and Comparative Examples was measured using a Coulter porometer 2 in accordance with ASTMF-316-80. The piercing strength is based on Japanese Agriculture and Forestry Standards for retort pouch food (April 25, 1988)
According to the Ministry of Agriculture, Forestry and Fisheries Notification No. 540), the diameter is 1.0 mm,
A needle having a tip shape of 0.5 mmR was pierced at a speed of 50 ± 5 mm / min, and the strength when the needle penetrated was measured.
【００２１】実施例１ パラアラミドパルプ(デュポン社製 ケブラーパルプ)を
スラリー濃度３％になるよう水に分散し、パルパーで分
散後、ディスクレファイナーで叩解し、フリーネスを５
０ｍｌとした。このスラリーに水を加えて濃度０.３％
のパラアラミドパルプスラリーとした。Example 1 Para-aramid pulp (Kevlar pulp manufactured by DuPont) was dispersed in water so as to have a slurry concentration of 3%, dispersed with a pulper and beaten with a disk refiner to reduce the freeness to 5%.
The volume was 0 ml. Water is added to this slurry to a concentration of 0.3%
Was prepared as a para-aramid pulp slurry.
【００２２】＜パラアラミド短繊維の分散と抄造＞水中
に、パラアラミド短繊維(デュポン社製 ケブラー２
９、繊維長６ｍｍ)をスラリー濃度０.３％となるよう添
加し、撹拌機で撹拌分散後、このパラアラミド短繊維ス
ラリーに上記のパラアラミドパルプスラリーを加え、撹
拌、混合した。配合比は固形分でパラアラミド短繊維１
５重量部、パラアラミドパルプ８５重量部とした。得ら
れたスラリーを、TAPPIの手抄きマシンを使用し、米坪
２４ｇ／ｍ2の薄葉紙を抄紙し、バインダーとしてアク
リル系熱硬化性樹脂エマルジョン(カネボウＮＳＣ ヨ
ドゾール ＡＤ５７）を得られた薄葉紙の重量に対し固
形分１０％添加後、１４０℃の熱風で乾燥した。<Dispersion and papermaking of para-aramid short fibers> In water, para-aramid short fibers (Kevlar 2 manufactured by DuPont)
9, a fiber length of 6 mm) was added to a slurry concentration of 0.3%, and the mixture was stirred and dispersed by a stirrer. Then, the above-mentioned para-aramid pulp slurry was added to this para-aramid short fiber slurry, followed by stirring and mixing. The mixing ratio is solid content of para-aramid short fiber 1
5 parts by weight and 85 parts by weight of para-aramid pulp were used. The obtained slurry was used to make thin paper of 24 g / m 2 tsubo using a TAPPI hand-making machine, and an acrylic thermosetting resin emulsion (Kanebo NSC Iodosol AD57) was obtained as a binder. After the addition of 10% solids, the mixture was dried with hot air at 140 ° C.
【００２３】得られたシートをロール温度２００℃のチ
ルド/チルドキャレンダーで線圧１８０ｋｇ／ｃｍで加
熱、加圧した。得られた薄葉紙について、米坪、厚さ、
最大孔径、突き刺し強度の測定をおこなった。結果を表
１に示す。The obtained sheet was heated and pressed at a linear pressure of 180 kg / cm by a chilled / chilled calender having a roll temperature of 200 ° C. About the obtained thin paper, rice tsubo, thickness,
The maximum pore diameter and piercing strength were measured. Table 1 shows the results.
【００２４】実施例２ パラアラミドパルプのフリーネスを１００ｍｌにした以
外、実施例１と同様にして薄葉紙を得た。この物性を表
１に示す。Example 2 Thin paper was obtained in the same manner as in Example 1 except that the freeness of para-aramid pulp was changed to 100 ml. The properties are shown in Table 1.
【００２５】実施例３ パラアラミド短繊維の配合比をパラアラミド短繊維とパ
ラアラミドパルプの合計１００重量部に対して６０重量
部にした以外、実施例１と同様にして薄葉紙を得た。こ
の物性を表１に示す。Example 3 Tissue paper was obtained in the same manner as in Example 1, except that the mixing ratio of the para-aramid short fibers was 60 parts by weight based on 100 parts by weight of the total of the para-aramid short fibers and the para-aramid pulp. The properties are shown in Table 1.
【００２６】実施例４ パラアラミド短繊維の繊維長を３ｍｍにした以外、実施
例１と同様にして薄葉紙を得た。この物性を表１に示
す。Example 4 Thin paper was obtained in the same manner as in Example 1 except that the fiber length of the para-aramid short fibers was 3 mm. The properties are shown in Table 1.
【００２７】実施例５ パラアラミドパルプのフリーネスを２５０ｍｌにした以
外、実施例１と同様にして薄葉紙を得た。この物性を表
１に示す。Example 5 Thin paper was obtained in the same manner as in Example 1 except that the freeness of para-aramid pulp was changed to 250 ml. The properties are shown in Table 1.
【００２８】実施例６ パラアラミド短繊維の繊維径を３デニールにした以外、
実施例１と同様にして薄葉紙を得た。この物性を表１に
示す。EXAMPLE 6 Para-aramid short fibers were prepared with the exception that the fiber diameter was 3 denier.
Thin paper was obtained in the same manner as in Example 1. The properties are shown in Table 1.
【００２９】実施例７ パラアラミド短繊維の繊維径を０．８デニールとし、配
合率をパラアラミド短繊維とパラアラミドパルプの合計
１００重量部に対して６０重量部とした以外、実施例１
と同様にして薄葉紙を得た。この物性を表１に示す。Example 7 Example 1 was repeated except that the fiber diameter of the para-aramid short fibers was 0.8 denier and the blending ratio was 60 parts by weight based on 100 parts by weight of the total of the para-aramid short fibers and the para-aramid pulp.
Thin paper was obtained in the same manner as described above. The properties are shown in Table 1.
【００３０】比較例１ パラアラミドパルプのフリーネスを１００ｍｌとし、パ
ラアラミド短繊維の配合量を０にした以外、実施例１と
同様にして薄葉紙を製造した。この物性を表２に示す。Comparative Example 1 Thin paper was produced in the same manner as in Example 1 except that the freeness of para-aramid pulp was 100 ml and the amount of para-aramid short fibers was 0. Table 2 shows the physical properties.
【００３１】比較例２ パラアラミドパルプのフリーネスを１０ｍｌにした以
外、実施例１と同様にして薄葉紙を製造した。この物性
を表２に示す。Comparative Example 2 Thin paper was produced in the same manner as in Example 1 except that the freeness of para-aramid pulp was changed to 10 ml. Table 2 shows the physical properties.
【００３２】比較例３ パラアラミド短繊維の配合比をパラアラミド短繊維とパ
ラアラミドパルプの合計１００重量部に対して１０重量
部にした以外、実施例１と同様にして薄葉紙を製造し
た。この物性を表２に示す。Comparative Example 3 Thin paper was produced in the same manner as in Example 1 except that the mixing ratio of para-aramid short fibers was changed to 10 parts by weight with respect to 100 parts by weight of the total of para-aramid short fibers and para-aramid pulp. Table 2 shows the physical properties.
【００３３】比較例４ パラアラミド短繊維の繊維長を１ｍｍにした以外、実施
例１と同様にして薄葉紙を製造した。この物性を表２に
示す。Comparative Example 4 Thin paper was manufactured in the same manner as in Example 1 except that the fiber length of the para-aramid short fibers was changed to 1 mm. Table 2 shows the physical properties.
【００３４】比較例５ パラアラミドパルプのフリーネスを３００ｍｌにした以
外、実施例１と同様にして薄葉紙を製造した。この物性
を表２に示す。Comparative Example 5 Thin paper was produced in the same manner as in Example 1, except that the freeness of para-aramid pulp was changed to 300 ml. Table 2 shows the physical properties.
【００３５】比較例６ パラアラミド短繊維の繊維径を０．５デニールとし、配
合率をパラアラミド短繊維とパラアラミドパルプの合計
１００重量部に対して６０重量部とした以外、実施例１
と同様にして薄葉紙を得た。この物性を表２に示す。Comparative Example 6 Example 1 was repeated except that the fiber diameter of the para-aramid short fibers was 0.5 denier and the blending ratio was 60 parts by weight based on 100 parts by weight of the total of the para-aramid short fibers and the para-aramid pulp.
Thin paper was obtained in the same manner as described above. Table 2 shows the physical properties.
【００３６】比較例７ パラアラミド短繊維の繊維径を５デニールにした以外、
実施例１と同様にして薄葉紙を得た。この物性を表２に
示す。Comparative Example 7 The para-aramid short fiber had a fiber diameter of 5 deniers.
Thin paper was obtained in the same manner as in Example 1. Table 2 shows the physical properties.
【００３７】[0037]
【表１】 [Table 1]
【００３８】[0038]
【表２】 [Table 2]
【００３９】実施例１〜５はいずれも最大孔径が２０μ
ｍ以下で、厚さ３５μｍ以下の突き刺し強度良好な薄葉
多孔性紙が得られた。しかしながら、比較例１、３、４
ではいずれも実施例より突き刺し強度に劣り、また比較
例２では突き刺し強度に優れるものの、最大孔径が大き
い。また比較例５では厚さが３５μｍを超え、目的とす
る極薄の薄葉多孔性紙が得られない。Examples 1 to 5 all have a maximum pore diameter of 20 μm.
m or less, a thin-leaf porous paper having a good piercing strength of 35 μm or less in thickness was obtained. However, Comparative Examples 1, 3, and 4
In each case, the piercing strength is inferior to that of the example, and in Comparative Example 2, although the piercing strength is excellent, the maximum pore diameter is large. Further, in Comparative Example 5, the thickness exceeds 35 μm, and the intended ultrathin thin-leaf porous paper cannot be obtained.
【００４０】[0040]
【発明の効果】本発明により、これまで得ることのでき
なかった薄くて米坪が小さく、突き刺し強度に優れた薄
葉多孔性紙を得ることができる。また最大孔径が小さく
ピンホール発生の少ない薄葉多孔性紙を得ることができ
る。According to the present invention, it is possible to obtain a thin-leaf porous paper which has not been obtained until now and which is thin, has a small tsubo, and has excellent piercing strength. Further, it is possible to obtain a thin-leaf porous paper having a small maximum pore diameter and little pinholes.
Claims (2)
ドパルプと繊維径０.８〜３デニール、繊維長３〜１５
ｍｍのパラアラミド短繊維と熱硬化性樹脂からなる厚さ
３５μｍ以下の紙であり、パラアラミド短繊維とパラア
ラミドパルプの合計を１００重量部として、パラアラミ
ド短繊維の比率は１５〜６０重量部であることを特徴と
する薄葉多孔紙。1. Freeness 20-250 ml of para-aramid pulp, fiber diameter 0.8-3 denier, fiber length 3-15
mm paper having a thickness of 35 μm or less, comprising para-aramid short fibers and a thermosetting resin, wherein the total ratio of the para-aramid short fibers and the para-aramid pulp is 100 parts by weight, and the ratio of the para-aramid short fibers is 15 to 60 parts by weight. Thin paper perforated paper characterized by the following.
記載の薄葉多孔紙。2. The thin paper perforated paper according to claim 1, wherein the maximum pore diameter is 20 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09724997A JP3777711B2 (en) | 1997-04-15 | 1997-04-15 | Thin leaf perforated paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09724997A JP3777711B2 (en) | 1997-04-15 | 1997-04-15 | Thin leaf perforated paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10292289A true JPH10292289A (en) | 1998-11-04 |
| JP3777711B2 JP3777711B2 (en) | 2006-05-24 |
Family
ID=14187312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09724997A Expired - Fee Related JP3777711B2 (en) | 1997-04-15 | 1997-04-15 | Thin leaf perforated paper |
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| Country | Link |
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| JP (1) | JP3777711B2 (en) |
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|---|---|---|---|---|
| WO2005057689A1 (en) * | 2003-12-11 | 2005-06-23 | Dupont Teijin Advanced Papers, Ltd. | Heat resistant separator and electric electronic component employing it |
| JP2010284649A (en) * | 2002-01-31 | 2010-12-24 | Kx Technologies Llc | Nanofiber filter medium |
| JP2014501858A (en) * | 2011-01-04 | 2014-01-23 | テイジン・アラミド・ビー．ブイ． | Paper containing microfilament |
| KR20160032231A (en) * | 2013-07-18 | 2016-03-23 | 데이진 아라미드 비.브이. | Fire-retardant sheet material |
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1997
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|---|---|---|---|---|
| JP2010284649A (en) * | 2002-01-31 | 2010-12-24 | Kx Technologies Llc | Nanofiber filter medium |
| JPWO2005057689A1 (en) * | 2003-12-11 | 2007-07-05 | デュポン帝人アドバンスドペーパー株式会社 | Heat-resistant separator and electrical and electronic parts using the same |
| WO2005057689A1 (en) * | 2003-12-11 | 2005-06-23 | Dupont Teijin Advanced Papers, Ltd. | Heat resistant separator and electric electronic component employing it |
| JP2014501858A (en) * | 2011-01-04 | 2014-01-23 | テイジン・アラミド・ビー．ブイ． | Paper containing microfilament |
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| JP2016527412A (en) * | 2013-07-18 | 2016-09-08 | テイジン・アラミド・ビー．ブイ． | Flame retardant sheet material |
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| JP2018515697A (en) * | 2015-05-28 | 2018-06-14 | コーロン インダストリーズ インク | Aramid paper, its production method and use |
| WO2019017354A1 (en) * | 2017-07-18 | 2019-01-24 | 日本バイリーン株式会社 | Separator for electrochemical element |
| JPWO2019017354A1 (en) * | 2017-07-18 | 2020-05-28 | 日本バイリーン株式会社 | Electrochemical element separator |
| US11862810B2 (en) | 2017-07-18 | 2024-01-02 | Japan Vilene Company, Ltd. | Separator for electrochemical element |
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