JPH0283066A - Simultaneous multilayer coating - Google Patents

Abstract

PURPOSE:To ensure stable coating almost free from a streak trouble even under high speed and thin film conditions by setting the viscosity of the bottom layer when the coating liquid of the bottom layer adjacent to a support has a specific solid density. CONSTITUTION:In simultaneous multilayer coating using a stride hopper device, if an insoluble solid content of 2 to 15w/v% exists in water containing an application liquid which forms a bottom layer adjacent to a support, the viscosity of the bottom layer is adjusted in accordance with the solid content. The viscosity of this bottom layer has a relationship with the solid content of the coating liquid for the bottom layer as expressed by a quadric equation, i.e., 2<=C<=8.8f(C)=0.7C<2>-12.33C+61.47, 8.8<=C<=14f(C)=2.0C<2>-35.24C+162.4 where C is the density of a solid component. A thicker is used for viscosity adjustment. In this way, stable coating almost free from a streak trouble can be performed even under high speed and thin film conditions.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はスライドホッパー装置による多層同時塗布方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a multilayer simultaneous coating method using a slide hopper device.

〔発明の背景〕[Background of the invention]

ウェブと通常体している長尺可撓性支持体上にスライド
ホッパー装置を用いて多数の層を同時に塗布する例とし
ては写真感光材料塗布の例が挙げられる。この方法はス
ライド面上を複数の層が重畳して同時に流れ、スライド
端において移動するウェブと出会う点にビードを形成し
、このビードを介して該多数の塗布層をウェブ上に同時
に塗布す、る。この塗布方法においてはビードの安定が
非常に重要であって、ビードの状態が不安定であると筋
状の故障が発生したり、液切れを起こして塗布不能にな
る場合すらあり、製品収率の低下、品質保証の問題等が
起こる。この対策として、例えばビードの上下に空気圧
力差を設は下側を負圧にすることにより、ビードの安定
をはかる方法等の技術がよく使用されている。このよう
な塗布方法において特に多層同時塗布の場合、各塗布層
の塗布液物性、ならびに相互の関係が安定な塗布を行う
為に非常に重要である。An example of coating a plurality of layers simultaneously using a slide hopper apparatus onto a long flexible support, which is usually a web, is in the case of coating photosensitive materials. In this method, a plurality of layers flow simultaneously on a slide surface in a superimposed manner, a bead is formed at the point where it meets the moving web at the end of the slide, and the multiple coating layers are simultaneously applied onto the web via this bead. Ru. Bead stability is very important in this coating method, and if the bead is unstable, streaks may occur, or the liquid may run out, making it impossible to coat, resulting in reduced product yield. This may lead to a decline in quality and quality assurance problems. As a countermeasure against this problem, techniques are often used, such as a method of stabilizing the bead by, for example, creating an air pressure difference between the upper and lower sides of the bead and creating a negative pressure on the lower side. In such a coating method, especially in the case of simultaneous multi-layer coating, the physical properties of the coating liquid of each coating layer and their mutual relationships are very important for stable coating.

近時、写真感光材料は薄膜化し、しかも高速塗布の要請
が強く、このような場合、安定な塗布を行う事が益々困
難になっている。In recent years, photographic materials have become thinner and there is a strong demand for high-speed coating, and in such cases it has become increasingly difficult to perform stable coating.

従来、このような対策として最下層の低粘度化が行なわ
れてきた。例えば特公昭５６−２０５３４号においては
、最下層２〜１２μｍの湿潤膜厚（以下ｈｗと記す）で
粘度１〜８ｃｐとし、次の層はｈｖ１５〜２０μＩで粘
度１０＝　１００ｃｐとする方法が開示されている。こ
の場合、最下層の粘度が低いためビード部が不安定とな
り、最下層と次層の間で層間混合が起こる。Conventionally, as a countermeasure to this, the viscosity of the bottom layer has been lowered. For example, Japanese Patent Publication No. 56-20534 discloses a method in which the lowest layer has a wet film thickness of 2 to 12 μm (hereinafter referred to as hw) and a viscosity of 1 to 8 cp, and the next layer has a wet film thickness of 2 to 12 μm and a viscosity of 10=100 cp. ing. In this case, since the viscosity of the bottom layer is low, the bead portion becomes unstable and interlayer mixing occurs between the bottom layer and the next layer.

特公昭６０−１２１０７号では、最下層の粘度が低剪断
速度（１０”５ｅｃ−’）の時、２０〜２００ｃｐ、高
剪断速度（ＬＯ’５ｅｃ−’）の時、１Ｏｃｐ以下とす
る方法が開示されているが、最下層のみの設定では層間
混合を起こしてしまう事がある。Japanese Patent Publication No. 60-12107 discloses a method in which the viscosity of the bottom layer is 20 to 200 cp at low shear rate (10''5ec-') and 1Ocp or less at high shear rate (LO'5ec-'). However, setting only the bottom layer may cause interlayer mixing.

特開昭５６−１０８５６６号では、低剪断速度の時は最
下層と隣接層の粘度差を±１０ｃｐとし高剪断速度の時
は最下層がその隣接層より低粘度になる方法を開示して
いる。JP-A-56-108566 discloses a method in which the viscosity difference between the bottom layer and the adjacent layer is ±10 cp at low shear rates, and the bottom layer has a lower viscosity than its adjacent layer at high shear rates. .

尚特開昭６１−１７４９７０号では上記と同様の方法を
最上層とその隣接層にも適用する方法を開示している。Furthermore, Japanese Patent Laid-Open No. 174970/1983 discloses a method in which the same method as above is applied to the uppermost layer and its adjacent layer.

特開昭５９〜１００４３４号には、比較的高粘度の層の
下側に加速層、上側に伸展層を設けることとし、この加
速層はｈｗ２〜３０μｍの時、粘度１〜２０ｃｐとし、
伸展層はｈｗ５〜２０μｍで１〜１００ｐとする方法を
開示している。In JP-A-59-100434, an acceleration layer is provided below a relatively high viscosity layer, and an extension layer is provided above the layer, and this acceleration layer has a viscosity of 1 to 20 cp when hw is 2 to 30 μm,
A method is disclosed in which the extension layer has a hw of 5 to 20 μm and a thickness of 1 to 100 p.

以上の特許は、いずれも基本的には最下層の粘度を次層
の粘度より低くする方法であるが、薄膜塗、布条件で低
粘度化することはビード形成には有利であるが、筋の発
生に対しては劣化する傾向にある。このＩ；め特願昭６
３−３０１８０号にはむしろ最下層粘度を高くする方法
が開示されており、筋の発生の完全な対策は未だ確立さ
れていないのが現状である。All of the above patents basically involve making the viscosity of the bottom layer lower than the viscosity of the next layer, but lowering the viscosity through thin film coating and cloth conditions is advantageous for bead formation, but It tends to deteriorate in response to the occurrence of. This I;me special request 1976
No. 3-30180 discloses a method of increasing the viscosity of the bottom layer, and the current situation is that a complete countermeasure against the occurrence of streaks has not yet been established.

〔発明の目的〕[Purpose of the invention]

上記問題点に対し本発明の目的は、スライドホッパー装
置を用いて多層同時塗布を行う場合、高速、薄膜条件に
おいても筋故障の出難い安定な塗布方法を提供すること
である。In view of the above-mentioned problems, an object of the present invention is to provide a stable coating method in which streak failure is unlikely to occur even under high-speed, thin-film conditions when performing multilayer simultaneous coating using a slide hopper device.

〔発明の構成〕[Structure of the invention]

本発明の上記目的は、スライドホッパー装置を用いて、
多数の塗布液を移動しているウェブに同時に塗布する多
層同時塗布方法において、支持体に接する最下層を形成
する塗布液に含有する水に不溶性の固形分含量が２〜１
５Ｗ／Ｖ％である場合、該最下層の粘度を上記固形分含
量に応じて調節することを特徴とする多層同時塗布方法
により達成される。The above object of the present invention is to use a slide hopper device to
In a multilayer simultaneous coating method in which a large number of coating solutions are simultaneously applied to a moving web, the water-insoluble solid content contained in the coating solution forming the bottom layer in contact with the support is 2 to 1.
5 W/V% is achieved by a multilayer simultaneous coating method characterized in that the viscosity of the bottom layer is adjusted according to the solid content.

また、支持体側より第１層に塗布すべき液を２分し、１
方を上記の条件に適合する粘度及び固形分濃度条件とし
て、最下層塗布液とし、他方を第２層とすることを特徴
とする多層同時塗布方法も適用することができる。In addition, the liquid to be applied to the first layer from the support side was divided into two parts, and one
It is also possible to apply a multilayer simultaneous coating method characterized in that one layer is used as the bottom layer coating liquid and the other layer is used as the second layer, with the viscosity and solid content concentration conditions meeting the above conditions.

以下、本発明の詳細について説明する。The details of the present invention will be explained below.

前記のごとく、スライドホッパーによる多層同時塗布方
法における安定性に対しては各層の物性が非常に重要で
ある。特に最下層の粘度の設定は重要であるが、従来は
層間の関係のみに注意がはられれており、本発明のごと
く層を構成する固形含量と粘度の関係が塗布安定性に及
ぼす影響について着目し、解明した例はない。As mentioned above, the physical properties of each layer are very important for stability in the multilayer simultaneous coating method using a slide hopper. Setting the viscosity of the bottom layer is particularly important, but conventionally attention has been paid only to the relationship between layers, but as in the present invention, attention has been focused on the influence of the relationship between the solid content and viscosity of the layers on coating stability. However, there are no cases where this has been solved.

本発明者等は鋭意研究の結果、筋故障が出ない塗布安定
性を有する最下層の粘度は、該最下層塗布液中の固形含
量と２次式で表される関係があることを見いだした。し
かし、多層同時塗布する塗布液あるいは塗布条件により
上記粘度の絶対値としては若干の変動があるが、−例と
して固形含量による最下層の粘度の設定は下記式で算出
される値、（ｃｐｓ）以上であり、好ましくは該値〜該
値＋ＩＯである。ただし、塗布限界以上の高粘度に適用
出来ないことは言うまでもない。As a result of intensive research, the present inventors have discovered that the viscosity of the bottom layer, which has coating stability without streak failure, has a relationship expressed by a quadratic equation with the solid content in the bottom layer coating liquid. . However, the absolute value of the above viscosity may vary slightly depending on the coating solution or coating conditions used for simultaneous multi-layer coating; for example, the viscosity of the bottom layer based on the solids content can be calculated using the following formula: (cps) The value is above, and preferably the value is from the value to the value +IO. However, it goes without saying that it cannot be applied to high viscosities exceeding the coating limit.

２≦Ｃ≦８．８ ｒ（Ｃ）＝０．７Ｃ”−１２，３３ｃ＋６１．４７゜８
．８≦Ｃ≦１４ ｆ（Ｃ）＝２．０Ｃ２−３５，２４Ｃ＋１６２．４〔式
中、Ｃは固形分濃度（ｗ　／Ｖ％）であり、ｆ　（Ｃ）
は該固形分より上式で算出される粘度（ｃ　ｐ　ｓ）を
表す。〕 尚、最下層の粘度調整に増粘剤を用いることできる。2≦C≦8.8 r(C)=0.7C”-12,33c+61.47°8
．． 8≦C≦14 f (C) = 2.0C2-35, 24C + 162.4 [In the formula, C is the solid content concentration (w / V%), f (C)
represents the viscosity (c p s) calculated from the solid content using the above formula. ] Note that a thickener can be used to adjust the viscosity of the bottom layer.

また、支持体側から第１層に予定される塗布液層が前記
条件に適合しない場合、必ずしも該塗布液層全部を希釈
または増粘して前記条件範囲にする必要はなく、その１
部を前記条件範囲に固形分濃度及び粘度を調整して最下
層とすることができる。すなわち全部を希釈または増粘
することによる、乾燥負荷や塗布液供給系への負荷の増
大を防ぎつつ、筋故障の発生を防止することができる。In addition, if the coating liquid layer scheduled as the first layer from the support side does not meet the above conditions, it is not necessarily necessary to dilute or increase the viscosity of the entire coating liquid layer to bring it into the above condition range.
The bottom layer can be formed by adjusting the solid content concentration and viscosity within the above condition range. In other words, it is possible to prevent the occurrence of streak failure while preventing an increase in the drying load and the load on the coating liquid supply system due to dilution or thickening of the entire composition.

本発明でいう固形分とは、例えばハロゲン化銀写真感光
材料に適用した場合では、塗布液中のハロゲン化銀結晶
、マット剤等水に不溶の固形分を意味する。濃度Ｃ％は
塗布液１００ｃｃ中の固形分の重量（９）で表す。In the present invention, the solid content refers to solid content insoluble in water, such as silver halide crystals and matting agents in the coating solution, when applied to silver halide photographic materials, for example. The concentration C% is expressed as the weight (9) of solid content in 100 cc of the coating liquid.

粘度はブルックフィールド型粘度計で測定した値を採用
した。The viscosity was measured using a Brookfield viscometer.

本発明においてはスライドホッパー塗布方式によるもの
であれば、特に塗布液等に限定はないが、ハロゲン化銀
写真感光材料の多層同時塗布に対しては特に有効に適用
することができる。In the present invention, there are no particular limitations on the coating liquid as long as the slide hopper coating method is used, but it can be particularly effectively applied to simultaneous multilayer coating of silver halide photographic light-sensitive materials.

本発明に適用するハロゲン化銀写真感光材料には限定は
なく、該業界公知の各種材料、技術を適用することがで
きる。There is no limitation to the silver halide photographic material applicable to the present invention, and various materials and techniques known in the industry can be applied.

本発明の感光材料に用いるハロゲン化銀乳剤には、ハロ
ゲン化銀としで、臭化銀、塩化銀、沃臭化銀、塩臭化銀
、塩沃臭化銀等の通常の／１０ゲン化銀乳剤に使用され
る任意のものを用いる事ができ、ハロゲン化銀粒子は、
酸性法、中性法及びアンモニア法のいずれで得られたも
のでもよい。The silver halide emulsion used in the light-sensitive material of the present invention includes conventional silver halide emulsions such as silver bromide, silver chloride, silver iodobromide, silver chlorobromide, silver chloroiodobromide, etc. Any grains used in silver emulsions can be used, and the silver halide grains are
It may be obtained by any of the acidic method, neutral method and ammonia method.

、本発明のハロゲン化銀写真感光材料には各種添加剤を
含んでもよく、増粘剤又は可塑剤として例えば米国特許
２，９６０．４０４号、特公昭４３−４９３９号、***
国出願公告１，９０４，６０４号、特開昭４８−６３７
１５号、ベルギー国特許７６２．８３３号、米国特許３
，７６７．４１０号、ベルギー国特許５８８．１４３号
の各明細書に記載されている物質、例えばスチレン−マ
レイン酸ソーダ共重合体、デキストランサルフェート等
を用いることが出来、更に、塗布助剤、乳化剤、処理液
等に対する浸透性の改良剤、消泡剤或いは感光材料の種
々の物理的性質をコントロールするために用いられる界
面活性剤としては英国特許５４８，５３２号、同１，２
１６．３８９号、米国特許２，０２６．２０２号、同３
，５１４゜２９３号、特公昭４４−２６５８０号、同４
３−１７９２２号、同４３−１７９２６号、同４３−３
１６６号、同４８−２０７８５号、仏画特許２０２．５
８８号、ベルギー国特許７７３．４５９号、特開昭４８
−１０１１１８号等に記載されているアニオン性、カチ
オン性、非イオン性或いは両性の化合物を使用すること
ができるが、これらのうち特にスルホン基を有するアニ
オン界面活性剤、例えばコハク酸エステルスルホン化物
、アルキルベンゼンスルホン化物等が好ましい。また構
成層にはマット化剤、例えばスイス特許３３０．１５８
号に記載のシリカ、仏閣特許１，２９６，９９５号に記
載のガラス粉、英国特許１，１７３．１８１号に記載の
アルカリ土類金属又はカドミウム、亜鉛などの炭酸塩な
どの無機物粒子；米国特許２，３２２．０３７号に記載
の澱粉、ベルギー特許６２５．４５１号或いは英国特許
９８１，１９８号に記載された澱粉誘導体、特公昭４４
−３６４３号に記載のポリビニルアルコール、スイス特
許３３０．１５８号に記載されたポリスチレン或いはポ
リメチルメタアクリレート、米国特許３，０７９，２５
７号に記載のポリアクリロニトリル、米国特許３，０２
２，１６９号に記載のポリカーボネートのような有機物
粒子を含むことができる。The silver halide photographic material of the present invention may contain various additives, such as thickeners or plasticizers, such as those described in U.S. Pat. No. 904,604, JP-A-48-637
No. 15, Belgian Patent No. 762.833, US Patent No. 3
, No. 767.410 and Belgian Patent No. 588.143, such as styrene-sodium maleate copolymer, dextran sulfate, etc., and coating aids and emulsifiers. As surfactants used for improving permeability to processing liquids, antifoaming agents, and controlling various physical properties of photosensitive materials, British Patent Nos. 548,532 and 1, 2 are used as surfactants.
No. 16.389, U.S. Patent No. 2,026.202, No. 3
, No. 514゜293, Special Publication No. 44-26580, No. 4
No. 3-17922, No. 43-17926, No. 43-3
No. 166, No. 48-20785, French painting patent 202.5
No. 88, Belgian Patent No. 773.459, Japanese Unexamined Patent Publication No. 1973
Anionic, cationic, nonionic or amphoteric compounds described in No. 101118, etc. can be used, and among these, anionic surfactants having a sulfonic group, such as succinic acid ester sulfonated compounds, Alkylbenzene sulfonated compounds and the like are preferred. The constituent layers may also contain matting agents, such as Swiss Patent No. 330.158.
silica described in No. 1,296,995; glass powder described in British Patent No. 1,173.181; inorganic particles such as alkaline earth metals or carbonates such as cadmium and zinc described in British Patent No. 1,173.181; Starch described in No. 2,322.037, starch derivatives described in Belgian patent No. 625.451 or British patent No. 981,198, Japanese Patent Publication No. 1973
-3643, polystyrene or polymethyl methacrylate as described in Swiss Patent No. 330.158, U.S. Pat. No. 3,079,25
Polyacrylonitrile as described in No. 7, U.S. Pat. No. 3,02
Organic particles such as polycarbonate described in US Pat. No. 2,169 may be included.

多層同時塗布方法はカラー感光材料において特に有用で
あるが、カラー感光材料にはカプラー紫外線吸収剤、抗
酸化剤等の油溶性化合物が含まれる。感光材料には、更
に目的に応じて種々の添加剤を用いることができる。こ
れらの添加剤は、より詳しくは、リサーチディスクロー
ジャー第１７６巻１　ｔｅｍ１７６４３　（１９７８年
１２月）及び同１８７巻１　ｔｅ１１１８７１６（１９
７９年１１月）に記載されている。The multilayer simultaneous coating method is particularly useful for color light-sensitive materials, which contain oil-soluble compounds such as couplers, ultraviolet absorbers, and antioxidants. The photosensitive material may further contain various additives depending on the purpose. These additives are described in more detail in Research Disclosure Vol. 176, 1 tem 17643 (December 1978) and Research Disclosure, Vol.
(November 1979).

また感光材料に用いられるバインダー（又は保護コロイ
ド）としては、ゼラチンを用いるのが有利であるが、ゼ
ラチン誘導体、ゼラチンと他の高分子のグラフトポリマ
ー　それ以外の蛋白質、糖誘導体、セルロース誘導体、
単一或は共重合体のごとき合成親水性高分子物質等の親
水性コロイドも用いることが出来る。Furthermore, as a binder (or protective colloid) used in photosensitive materials, it is advantageous to use gelatin, but gelatin derivatives, graft polymers of gelatin and other polymers, other proteins, sugar derivatives, cellulose derivatives,
Hydrophilic colloids such as synthetic hydrophilic polymeric materials such as single or copolymers may also be used.

〔実施例〕〔Example〕

実施例１ 常法により、沃化銀２モル％を含み、緑感性を有する沃
臭化銀乳剤を調製した。該乳剤はゼラチンをバインダー
とし、該乳剤３５（２中には沃臭化銀６．６５に９、ゼ
ラチン１．７５に９を含有し、延展剤として、界面活性
剤ソヂウムージー（２−エチルヘキシル）−スルホサク
シネートの１％水溶液、増粘剤としてはスチレン−マレ
イン酸共重合体の４％水溶液を使用した。保護層として
は、８％のゼラチン水溶液２０Ｑに前記界面活性剤を１
．２１２、硬膜剤としてホルマリンの４％水溶液１．６
＋２．更に増粘剤としては前記の共重合体を加え、保護
層塗布粘度を３５゛Ｃにおいて２０ｃｐに調節した。Example 1 A silver iodobromide emulsion containing 2 mol % of silver iodide and having green sensitivity was prepared by a conventional method. The emulsion uses gelatin as a binder, emulsion 35 (2 contains 6.65 to 9 silver iodobromide and 1.75 to 9 gelatin), and the surfactant sodium mousse (2-ethylhexyl) as a spreading agent. A 1% aqueous solution of sulfosuccinate was used, and a 4% aqueous solution of styrene-maleic acid copolymer was used as a thickener.As a protective layer, 1% of the above surfactant was added to 8% gelatin aqueous solution 20Q.
．． 212, 4% aqueous solution of formalin as hardening agent 1.6
+2. Further, the above copolymer was added as a thickener, and the coating viscosity of the protective layer was adjusted to 20 cp at 35°C.

乳剤層塗布液は表１に示すゼラチン、界面活性剤を加え
、種々の固形分濃度を有する液を調製した。上記塗布液
をポリエチレンテレフタレートベース上に塗布速度６０
ｍ／ｍｉｎで支持体側から乳剤層、保護層の順にスライ
ドホッパー装置を用いて２層同時塗布した。その際のコ
ーター間隙は１５０μｍ１表１ 表１に使用した乳剤量は総て各３５Ｑであり、各試料は
表２に示すごとく増粘剤を添加して３５゛Ｃにおいて各
種の粘度を有する塗布液を調製した。The gelatin and surfactant shown in Table 1 were added to the emulsion layer coating solution to prepare solutions having various solid content concentrations. Coating the above coating solution onto the polyethylene terephthalate base at a speed of 60
Two layers were simultaneously coated using a slide hopper device in the order of the emulsion layer and the protective layer from the support side at m/min. The coater gap at that time was 150 μm1 Table 1 The amount of emulsion used in Table 1 was all 35Q, and each sample was coated with a coating solution having various viscosities at 35°C by adding a thickener as shown in Table 2. was prepared.

これらの各種条件の塗布液を前記のごとく保護層と２層
同時塗布した。塗布時の液温は３５°Ｃである。塗布乾
燥後、常法により現像し、得られた現像ずみ試料を検討
し、単位幅当たりの筋発生本数を調べた。Coating liquids under these various conditions were simultaneously coated in two layers, including the protective layer, as described above. The liquid temperature during application was 35°C. After coating and drying, development was performed by a conventional method, and the developed sample obtained was examined to determine the number of streaks generated per unit width.

この結果をグラフｌに示す。The results are shown in graph 1.

同グラフにおいて筋発生本数は ○・・０本、△・・１〜５本、Ｘ・・６〜１２本、××
・・２０本以上を示す。In the same graph, the number of muscles generated is ○...0, △...1 to 5, X...6 to 12, ××
...Indicates 20 or more pieces.

単位　ｃ　ｐ　ｓ　（３５℃） グラフｌの結果より筋故障の出ない粘度は固形分含量と
２次関数関係がみられ、固形分含量から導かれる粘度以
上であれば筋故障の発生が抑制されることがわかる。た
だし、ある粘度以上では当然ビード破壊がおこる。本実
施例ではその限界は約５０ｃ　ｐ　ｓである。Units: c p s (35°C) From the results in graph 1, it can be seen that the viscosity at which muscle failure does not occur has a quadratic relationship with the solids content, and if the viscosity is higher than the viscosity derived from the solid content, the occurrence of muscle failure will be suppressed. I understand that. However, above a certain viscosity, bead breakage naturally occurs. In this example, the limit is approximately 50 cps.

実施例２ Ｅｍｌの調製 常法により、沃化銀７モル％を含み、青感性を有する沃
臭化銀乳剤を調製した。該乳剤はゼラチンをバインダー
とし、該乳剤３０ｆｆ中には沃臭化銀６゜７３に９、ゼ
ラチン１．５Ｋｇを含有し、延展剤として、界面活性剤
ソヂウムージー（２−エチルヘキシル）−スルホサクシ
ネートの１％水溶液、増粘剤としてはカルボキシアルキ
ルデキストラン ルの４％水溶液を使用した。また、下記黄色カプラー溶
液を添加してＥｍｌとした。Example 2 Preparation of Eml A silver iodobromide emulsion containing 7 mol % of silver iodide and having blue sensitivity was prepared by a conventional method. The emulsion uses gelatin as a binder, and 30 ff of the emulsion contains 6.73 to 9 silver iodobromide and 1.5 kg of gelatin, and the surfactant sodium mousse (2-ethylhexyl)-sulfosuccinate is used as a spreading agent. A 1% aqueous solution was used, and a 4% aqueous solution of carboxyalkyl dextran was used as the thickener. Further, the following yellow coupler solution was added to prepare Eml.

Ｅｍｌは表３に示すように乳剤３０４に下記カプラー溶
液４０Ｑを加え、ゼラチン量及び仕上げ量をかえてＡ−
Ｄの４種類の乳剤を作成し、さらにこれら各乳剤を表４
に示すように上記増粘剤量のコントロールにより粘度（
３８°Ｃ）をかえた試料を作成した。As shown in Table 3, Eml was prepared by adding the following coupler solution 40Q to emulsion 304 and changing the amount of gelatin and finishing amount.
Four types of emulsions D were prepared, and each of these emulsions was shown in Table 4.
As shown in the figure, the viscosity (
Samples were prepared at different temperatures (38°C).

黄色カプラー溶液 下記構造のカプラー１．８Ｋｇをジブチル７タレート１
．８Ｋｇと酢酸エチル３．６Ｑ．に溶解し、ラウリルス
ルホコハク酸ナトリウム１００９を含む５％ゼラチン溶
液３０１２に加え、ＡＰＶゴーリン社製ホモジナイザー
　タイプＭ３で乳化分散を行い４Ｈに仕上げ、黄色形成
カプラー 表　　３ 表３に使用した乳剤量は各３０Ｑ１カプラー量は４０ａ
である。Yellow coupler solution 1.8 kg of coupler with the following structure is mixed with 7 dibutyl talates and 1 part
．． 8Kg and ethyl acetate 3.6Q. The amount of emulsion used in Table 3 is 30Q1 for each yellow forming coupler. Coupler amount is 40a
It is.

表４ 単位　ｃｐｓ（３８℃） Ｅｍ２の調製 常法により、沃化銀４モル％を含み、緑感性を有する沃
臭化銀乳剤を調製した。該乳剤はゼラチンをバインダー
とし、該乳剤３５１２中には沃臭化銀６゜６８に９、ゼ
ラチン１．７５Ｋｇを含有し、延展剤として、界面活性
剤ソヂウムージ−（２−エチルヘキシル）スルホサクシ
ネートの１％水溶液、さらに上記カプラー液を４０Ｑ加
え、増粘剤としてはカルボキシ、アルキルデキストラン
硫酸エステルの４％水溶液を使用し、液粘度２０ｃ　ｐ
　ｓ　（３８°Ｃ）になるように１３３．６ｆｆに仕上
げ、Ｅｍ２とした。Table 4 Unit cps (38°C) A silver iodobromide emulsion containing 4 mol % of silver iodide and having green sensitivity was prepared by a conventional method for preparing Em2. The emulsion uses gelatin as a binder, and emulsion 3512 contains 6.68 to 9 silver iodobromide and 1.75 kg of gelatin, and contains the surfactant sodium mousse (2-ethylhexyl) sulfosuccinate as a spreading agent. A 1% aqueous solution and 40Q of the above coupler liquid were added, a 4% aqueous solution of carboxy and alkyl dextran sulfate was used as a thickener, and the liquid viscosity was 20cp.
It was finished to 133.6ff so that the temperature was 38°C (38°C), and it was named Em2.

保護層の調製 保護層としては、５％のゼラチン水溶液中２０Ｑ中にラ
ウリルベンゼンスルホン酸ナトリウムを０．２％の濃度
で含み、硬膜剤としてホルマリンの４％水溶液１．６１
２．更に増粘剤としては前記の共重合体を加え、保護層
塗布粘度を２０ｃｐ（３８℃）に調節し　に　。Preparation of the protective layer The protective layer contained sodium laurylbenzenesulfonate at a concentration of 0.2% in 20Q in a 5% aqueous gelatin solution, and a 4% aqueous formalin solution 1.61% as a hardening agent.
2. Furthermore, the above copolymer was added as a thickener to adjust the coating viscosity of the protective layer to 20 cp (38°C).

上記のように調製した各塗布液を支持体側からＥｍｌ、
Ｅｍ２、保護層の順にスライドホッパー装置によりトリ
アセテートペース上に同時塗布した。その条件は塗布時
湿潤膜厚はＥｍｌが４０μｍ。Eml each coating solution prepared as above from the support side,
Em2 and the protective layer were simultaneously coated on the triacetate paste in this order using a slide hopper device. The conditions were that the wet film thickness at the time of coating was 40 μm.

Ｅｍ２は３０μｍ１保護膜は２０μｍとし、塗布速度８
０ｍ／ｍｉｎ、コーター間隙１５０．ｕｍ、コーター減
圧度は一３０ｍｍａｑ、塗布液温度３８°Ｃで塗布した
。Em2 is 30 μm, protective film is 20 μm, coating speed is 8
0m/min, coater gap 150. The coater was coated at a vacuum of -30 mmaq and a coating solution temperature of 38°C.

これらの各種条件の試料を塗布乾燥後、常法により現像
し、得られた現像ずみ試料を検討し、単位幅当たりの筋
発生本数を調べた。After coating and drying samples under these various conditions, they were developed by a conventional method, and the developed samples obtained were examined to determine the number of streaks generated per unit width.

この結果をグラフ２に示す。The results are shown in Graph 2.

グラフ２から明らかなように本実施例の結果でも実施例
１と同様に筋故障の出ない粘度は固形分含量と相関が認
められる。As is clear from Graph 2, in the results of this example, as in Example 1, the viscosity at which muscle failure does not occur is correlated with the solid content.

実施例３ 常法により、塩化銀９０モル％、臭化銀１０モル％を含
む塩臭化銀乳剤を調製した。該乳・剤はゼラチンをバイ
ンダーとし、該乳剤３５Ｑ中には塩臭化銀５゜２ＬＫｇ
、ゼラチン１．７５Ｋｇを含有し、延展剤として、界面
活性剤ソヂウムーイソアミルーＮ−デシル−スルホサク
シネートの２％水溶液、増粘剤としてはポリスチレンス
ルホン酸ナトリウムの４％水溶液を使用した。保護層と
しては、８％のゼラチン水溶液１０１２に前記界面活性
剤をｏ、ａＱ、硬膜剤としてホルマリンの４％水溶液０
．８Ｌ　グリオキザールの４％水溶液Ｏ，ａ１２、更に
増粘剤としては前記のものを加え、保護層塗布粘度を２
０ｃｐ（３８°Ｃ）に調節しｔこ。Example 3 A silver chlorobromide emulsion containing 90 mol % of silver chloride and 10 mol % of silver bromide was prepared by a conventional method. The emulsion uses gelatin as a binder, and the emulsion 35Q contains 5°2 LKg of silver chlorobromide.
, 1.75 kg of gelatin was used, a 2% aqueous solution of surfactant sodium isoamyl N-decyl-sulfosuccinate was used as a spreading agent, and a 4% aqueous solution of sodium polystyrene sulfonate was used as a thickener. As a protective layer, the above surfactant was added to 8% gelatin aqueous solution 1012, aQ, and 4% formalin aqueous solution 0 was used as a hardening agent.
．． 8L 4% aqueous solution of glyoxal O, a12, and further add the above-mentioned thickener to reduce the coating viscosity of the protective layer to 2.
Adjust to 0cp (38°C).

乳剤層塗布液は表５に示すようにゼラチン、界面活性剤
を加え、種々の固形分濃度を有する液を調・製した。Emulsion layer coating solutions were prepared by adding gelatin and surfactants as shown in Table 5, and having various solid content concentrations.

上記塗布液をポリエチレンテレフタレートペース上に塗
布速度９０ｍ／ｍｉｎで支持体側から乳剤層、保護層の
順にスライドホッパー装置を用いて２層間時塗布した。The above coating solution was coated onto a polyethylene terephthalate paste at a coating speed of 90 m/min in two layers from the support side in the order of the emulsion layer and the protective layer using a slide hopper device.

その際のコーター間隙は１５０μｍ。The coater gap at that time was 150 μm.

減圧度−３Ｑｍｍａｑ、塗布液温度３５℃とした。The degree of vacuum was -3Qmmaq, and the coating liquid temperature was 35°C.

表　　５ 表５に使用した乳剤量は総て各３５Ｑであり、各試料は
表６に示すごとく増粘剤を添加して３５°Ｃにおいて各
種の粘度を有する塗布液を調製した。Table 5 The amounts of emulsions used in Table 5 were all 35Q, and as shown in Table 6, thickeners were added to each sample to prepare coating solutions having various viscosities at 35°C.

これらの各種条件の塗布液を前記のごとく保護！と２層
間時塗布した。塗布乾燥後、常法により現像し、得られ
た現像ずみ試料を検討し、単位幅当たりの筋発生本数を
調べた。Protect the coating liquid under these various conditions as described above! The two layers were coated for one hour. After coating and drying, development was performed by a conventional method, and the developed sample obtained was examined to determine the number of streaks generated per unit width.

この結果をグラフ３に示す。The results are shown in Graph 3.

同グラフにおいて筋発生本数の表示は実施例１と同じで
ある。In the same graph, the display of the number of muscle formations is the same as in Example 1.

表６ 単位　ｅｌ）Ｓ（３５°Ｃ） グラフ３の結果より筋故障の出ない粘度は固形分含量と
２次関数関係がみられ、固形分含量から導かれる粘度以
上であれば筋故障の発生が抑制されることがわかる。Table 6 Unit: el) S (35°C) From the results of Graph 3, the viscosity at which muscle failure does not occur has a quadratic relationship with the solid content, and if the viscosity is higher than the viscosity derived from the solid content, muscle failure will occur. can be seen to be suppressed.

さらに、実施例１〜３において筋の発生しない最低の粘
度値をプロットしたのがグラフ４である。Further, Graph 4 is a plot of the lowest viscosity values at which streaks do not occur in Examples 1 to 3.

グラフ４から実験系が異なっているにも拘わらずこのグ
ラフは驚くべき連続性をしめしていることがわかる。本
発明者等は他の数多くの実験の結果、支持体に接する最
下層塗布液の固形分濃度に対し下記実験式で表現される
数値以上の値を粘度値として採用すれば、筋の発生が極
めてよく抑制される。ことを見いだした。またこの関係
をグラフ５に示す。From graph 4, it can be seen that this graph shows surprising continuity despite the different experimental systems. As a result of numerous other experiments, the present inventors have found that if a value greater than the value expressed by the following empirical formula is adopted as the viscosity value for the solid content concentration of the bottom layer coating liquid in contact with the support, streaks will not occur. Very well suppressed. I found out. This relationship is also shown in graph 5.

２≦Ｃ≦８．８ ｆ（Ｃ）＝０．７Ｃ”−１２，３３ｃ＋６１．４７゜８
．８≦Ｃ≦１４ ｆ（Ｃ）＝２−ＱＣ’−３５，２４Ｃ＋１６２．４〔式
中、Ｃは固形分濃度（Ｗ／ｖ％）であり、ｆ　（Ｃ）は
該固形分より上式で算出される粘度（ｃ　ｐ　ｓ）を表
す。〕 実施例４ 常法により、沃化銀２モル％、を含む沃臭化銀乳剤を調
製した。該乳剤はゼラチンをバインダーとし、該乳剤３
５ｇ中には沃臭化銀６．６５に９、ゼラチン１．５７５
に９を含有し、延展剤として、界面活性剤ソヂウムージ
（−２−エチルヘキシル）−スルホサクシネートの１％
水溶液、増粘剤としてはスチレン−マレイン酸共重合体
の４％水溶液を使用した。2≦C≦8.8 f(C)=0.7C”-12,33c+61.47°8
．． 8≦C≦14 f(C)=2-QC'-35,24C+162.4 [wherein, C is the solid content concentration (W/v%), and f (C) is It represents the calculated viscosity (c p s). Example 4 A silver iodobromide emulsion containing 2 mol % of silver iodide was prepared by a conventional method. The emulsion uses gelatin as a binder, and the emulsion 3
5 g contains 6.65 to 9 silver iodobromide and 1.575 to 9 gelatin.
9 and 1% of the surfactant sodium sulfosuccinate (-2-ethylhexyl)-sulfosuccinate as a spreading agent.
A 4% aqueous solution of styrene-maleic acid copolymer was used as the aqueous solution and thickener.

Ｅ　ｍ　３の調製 上記乳剤３５ｇ中にゼラチン２４９３ｇ、上記界面活性
剤５１．２ｃｃを添加し、５１．２Ｑに仕上げた。Preparation of E m 3 2493 g of gelatin and 51.2 cc of the above surfactant were added to 35 g of the above emulsion to give an emulsion of 51.2Q.

Ｅｍ４の調製 上記乳剤３５６中にゼラチン２４９３ｇ、上記界面活性
剤７３．８ｃｃを添加し、７３．８Ｑに仕上げた。Preparation of Em4 2493 g of gelatin and 73.8 cc of the above surfactant were added to the above emulsion 356 to give an emulsion of 73.8Q.

上記Ｅ　ｍ　３．４は共に１２ｃ　ｐ　ｓ　（３８℃）
に粘度調整した。The above E m 3.4 is both 12c ps (38℃)
The viscosity was adjusted to

保護層の調製 堡−裏層としては、８％のゼラチン水溶液１０ｆｆｉに
前記界面活性剤を０．８２．硬膜剤としてホルマリンの
４％水溶液０．８ρ、グリオキザールの４％水溶液０．
８１２．更に増粘剤としては前記のものを加え、保護層
塗布粘度を２０ｃｐ（３８℃戸こ調節した。Preparation of protective layer - For the back layer, 0.82% of the above surfactant was added to 10ffi of an 8% aqueous gelatin solution. As a hardening agent, a 4% aqueous solution of formalin 0.8ρ and a 4% aqueous solution of glyoxal 0.8ρ.
812. Furthermore, the above-mentioned thickener was added, and the coating viscosity of the protective layer was adjusted to 20 cp (38° C.).

塗布試料ｌとして支持体側最下層にＥ　ｍ　３を湿潤膜
厚５０μｍ１その上に保護層を同じ＜２０μｍで同時２
層塗布した。As a coating sample 1, E m 3 was applied as the lowest layer on the support side at a wet film thickness of 50 μm 1 and a protective layer was placed on top of it at the same <20 μm 2 at the same time.
A layer was applied.

塗布試料２としては支持体側最下層にＥｍ４を湿潤膜厚
１４．４／７　ｍ　、その上にＥｍ３を４０μｍ、さら
にその上層に保護膜を同じ＜２０μｍで同時３層塗布し
Ｉ；。For coating sample 2, Em4 was applied as the lowest layer on the support side to a wet film thickness of 14.4/7 m, Em3 was applied on top of that to a thickness of 40 μm, and a protective film was applied on top of that in three layers simultaneously at the same thickness of <20 μm.

支持体は１８０μｍのポリエチレンテレフタレートベー
スを用い、塗布速度６０ｍ／ｗｉｎでスライドホッパー
装置を用い、コーター間隙は１５０２ｍ１減圧度−３９
ｃｍａｑ、液温度３８℃とした。A 180 μm polyethylene terephthalate base was used as the support, a slide hopper device was used at a coating speed of 60 m/win, and the coater gap was 1502 m1 and the degree of vacuum was -39.
cmaq, and the liquid temperature was 38°C.

実施例１と同様の方法で評価した結果、単位幅当たりの
筋本数は塗布試料ｌが３０本、塗布試料２は発生がなか
った。As a result of evaluation in the same manner as in Example 1, the number of streaks per unit width was 30 for coated sample 1, and no streaks for coated sample 2.

本実施例のごとく２、固形分１２％を含む乳剤層塗布液
を粘度１２ｃｐｓとし、そのまま塗布した系では筋が多
発したにも拘わらず、その１部を希釈し、これを新たな
最下層として塗布した系では筋は発生しなかった。As in Example 2, the emulsion layer coating solution containing 12% solid content was made to have a viscosity of 12 cps, and even though many streaks occurred when the system was applied as is, a part of it was diluted and used as a new bottom layer. No streaks occurred in the applied system.

塗布試料ｌ及び２は乾燥後においては全く同じ銀付量、
ゼラチン付量であり、性能上は全く同一の品質であった
。Coated samples 1 and 2 have exactly the same amount of silver coating after drying,
The amount of gelatin applied was the same, and the quality was exactly the same in terms of performance.

本実施例の別の実施態様として塗布液の粘度を上昇させ
ることなく、最下層に塗布すべき液の一部を分割し、所
望の固形分濃度とした上でこれを新たな最下層として用
い、残りはそのまま第２層目以上に適用することにより
、筋のない良好な塗布品質を得ることが出来る。As another embodiment of this example, without increasing the viscosity of the coating liquid, a part of the liquid to be applied to the bottom layer is divided, the desired solid content concentration is achieved, and this is used as a new bottom layer. By applying the rest as is to the second layer or higher, good coating quality without streaks can be obtained.

実施例５ 常法により、沃化銀５モル％を含み、緑感性を有する沃
臭化銀乳剤を調製した。該乳剤はゼラチンをバインダー
とし、該乳剤３０Ｑ中には沃臭化銀６゜６９７Ｋｇ、ゼ
ラチン１．２に９を含有し、延展剤として、界面活性剤
ソヂウムージ−（２−エチルヘキシル）−スルホサクシ
ネートの１％水溶液、増粘剤としてはカルボキシアルキ
ルデキストラン硫酸エステルの４％水溶液を使用した。Example 5 A silver iodobromide emulsion containing 5 mol % of silver iodide and having green sensitivity was prepared by a conventional method. The emulsion uses gelatin as a binder, and emulsion 30Q contains 6.697 kg of silver iodobromide, 9 to 1.2 kg of gelatin, and the surfactant sodium mousse-(2-ethylhexyl)-sulfosuccinate as a spreading agent. A 1% aqueous solution of carboxyalkyl dextran sulfate was used as the thickener.

また、下記マゼンタカプラー溶液を添加した。Additionally, the following magenta coupler solution was added.

さらに上記乳剤３０ｆｆに下記カブラ−溶液３５１２を
加えた。Furthermore, the following fogler solution 3512 was added to 30ff of the above emulsion.

下記構造のカプラー１．８Ｋｇを酢酸エチル４．０Ｑと
ジブチル７タレート１．８Ｋｇに溶解し、トリイソプロ
ピルベンゼンスルホン酸ナトリウム１００ｇを含む５％
ゼラチン溶液３０Ｑに加え、ＡＰＶゴーリン社製ホモジ
ナイザー　タイプＭ３で乳化分散を行い水を加えて３５
Ｑに仕上げ、乳剤に添加した。Dissolve 1.8 kg of a coupler with the following structure in 4.0 Q of ethyl acetate and 1.8 kg of dibutyl 7-talate, and prepare a 5% solution containing 100 g of sodium triisopropylbenzenesulfonate.
In addition to gelatin solution 30Q, emulsify and disperse with APV Gorlin homogenizer type M3 and add water.
Q was finished and added to the emulsion.

上記乳剤３０ｆｆとカプラー３５Ｑの中にゼラチン６２
３０り、上記界面活性剤２２．３ｃｃを添加し、２２３
Ｑに仕上げた。粘度は１５ｃｐｓ　（３８℃）に調整し
た。Gelatin 62 in the above emulsion 30ff and coupler 35Q
30, add 22.3 cc of the above surfactant,
I finished it in Q. The viscosity was adjusted to 15 cps (38°C).

Ｅｍ６の調製 Ｅｍ５の１１１．６１２を大川原製作所製遠心薄膜濃縮
機ＣＥＰ−Ｉｓ型を用いて６７ｆｆまで濃縮した。この
結果、塗布液粘度は２０ｃｐｓ（３３℃）となった。Preparation of Em6 111.612 of Em5 was concentrated to 67ff using a centrifugal thin film concentrator model CEP-Is manufactured by Okawara Seisakusho. As a result, the viscosity of the coating liquid was 20 cps (33° C.).

保護層としては、５％のゼラチン水溶液中２０ｆｆ中に
ラウリルベンゼンスルホン酸ナトリウムを０．２％の濃
度で含み、硬膜剤としてホルマリンの４％水溶液１．６
ｆｆ、更に増粘剤としては前記の共重合体を加え、保護
層塗布粘度を２０ｃｐ（３８℃）に調節した。The protective layer contained sodium laurylbenzenesulfonate at a concentration of 0.2% in 20ff of a 5% aqueous gelatin solution, and the hardening agent was a 4% aqueous formalin solution (1.6%).
ff, and the above-mentioned copolymer was added as a thickener, and the coating viscosity of the protective layer was adjusted to 20 cp (38° C.).

塗布試料３として支持体側最下層にＥｍ５を湿潤膜厚４
０μｍ１その上に実施例２で用いたＥ　ｍ　２を３５μ
ｍ１さらに保護層を同じ＜２０μｍで同時３層塗布した
。As coating sample 3, Em5 was applied as the lowest layer on the support side at a wet film thickness of 4.
0 μm 1 On top of that, 35 μm of E m 2 used in Example 2
ml and three protective layers with the same <20 μm thickness were simultaneously applied.

塗布試料４としては支持体側最下層にＥ　ｍ　６を湿潤
膜厚１２μｍ１その上にＥｍ５を２０　ｐ　ｍ　ｓさら
にその上層に上記Ｅｍ２を３５μｍ１次に保護膜を同じ
＜２０μｍで同時４層塗布した。For coating sample 4, the lowest layer on the support side was coated with E m 6 at a wet film thickness of 12 μm, on top of which Em5 was coated at 20 pm, and the above Em2 was coated on top with a wet film thickness of 35 μm, and then a protective film was coated in 4 layers at the same thickness of <20 μm.

支持体は１２０μｍのトリアセテートベースを用い、塗
布速度８０ａ＋／ｗｉｎでスライドホッパー装置ヲ用い
、コーター間隙は１５０Ｉ４ｍ１減圧度−３０ｍｍａｑ
１塗布液温度３８℃とした。A 120μm triacetate base was used as the support, a slide hopper device was used at a coating speed of 80a+/win, and the coater gap was 150I4m1 and the degree of vacuum was -30mmaq.
1 Coating solution temperature was 38°C.

実施例１と同様の方法で評価した結果、単位幅光たりの
筋本数は塗布試料３が３６本、塗布試料４は発生がなか
った。As a result of evaluation in the same manner as in Example 1, the number of streaks per unit width of light was 36 for coated sample 3, and no streaks for coated sample 4.

固形分３％を含むＥｍ５を粘度１５ｃｐｓ　（３８°Ｃ
）とし、そのまま塗布した系では、筋が多発した（こも
拘わらず、その１部を濃縮し、これを新たな最下層とし
て塗布した系んでは筋の発生はなかった。Em5 containing 3% solids with a viscosity of 15 cps (38°C
), and in the system where it was applied as it was, many streaks occurred (However, in the system where a part of it was concentrated and applied as a new bottom layer, no streaks occurred.

塗布試料５．６は乾燥後においては全く同じ銀付量、同
じゼラチン付量であり、性能上全べ同じ品質であった。Coated samples 5.6 had exactly the same amount of silver and gelatin after drying, and had the same quality in terms of performance.

〔発・明の効果〕〔Effect of the invention〕

本発明により、多層同時塗布において、高速薄膜条件に
おいても筋故障の出難い安定な塗布方法を提供すること
ができた。According to the present invention, it was possible to provide a stable coating method in which streak failure is unlikely to occur even under high-speed thin film conditions in multilayer simultaneous coating.

【図面の簡単な説明】[Brief explanation of the drawing]

グラフ１〜グラフ５はそれぞれ多層同時塗布の際の、最
下層の固形分含量と粘度の関係における筋故障発生状況
を示すグラフである。Graphs 1 to 5 are graphs showing the occurrence of streak failure in the relationship between the solid content and viscosity of the bottom layer during simultaneous multilayer coating.

Claims (2)

【特許請求の範囲】[Claims] （１）スライドホッパー装置を用いて、多数の塗布液を
、移動しているウェブに同時に塗布する多層同時塗布方
法において、支持体に接する最下層を形成する塗布液が
水に不溶性の固形分含量を２〜１５Ｗ／Ｖ％含有する場
合、該最下層の粘度を上記固形分含量に応じて調節する
ことを特徴とする多層同時塗布方法。(1) In a multilayer simultaneous coating method in which multiple coating solutions are simultaneously applied to a moving web using a slide hopper device, the water-insoluble solid content of the coating solution that forms the bottom layer in contact with the support. 2 to 15 W/V%, the viscosity of the bottom layer is adjusted according to the solid content. （２）支持体側より第１層に塗布すべき液を２分し、１
方を上記請求項１の条件に適合する粘度及び固形分濃度
条件として、最下層塗布液とし、他方を第２層とするこ
とを特徴とする多層同時塗布方法。(2) Divide the liquid to be applied to the first layer from the support side into two parts, and
A multi-layer simultaneous coating method, characterized in that one of the coating liquids is used as the bottom layer coating liquid, and the other layer is used as the second layer, with the viscosity and solid content concentration conditions meeting the conditions of claim 1.