JPH02192022A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPH02192022A JPH02192022A JP1071989A JP1071989A JPH02192022A JP H02192022 A JPH02192022 A JP H02192022A JP 1071989 A JP1071989 A JP 1071989A JP 1071989 A JP1071989 A JP 1071989A JP H02192022 A JPH02192022 A JP H02192022A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- coating
- coating liquid
- recording medium
- magnetic coating
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 60
- 239000011248 coating agent Substances 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 12
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 claims abstract description 10
- 239000000787 lecithin Substances 0.000 claims abstract description 10
- 229940067606 lecithin Drugs 0.000 claims abstract description 10
- 235000010445 lecithin Nutrition 0.000 claims abstract description 10
- -1 phosphate ester Chemical class 0.000 claims description 13
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 238000007765 extrusion coating Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000010409 thin film Substances 0.000 abstract description 6
- 150000002148 esters Chemical class 0.000 abstract 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 12
- 238000001125 extrusion Methods 0.000 description 11
- 239000003973 paint Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 239000006247 magnetic powder Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000009501 film coating Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003962 NiZn Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000002877 alkyl aryl group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910052571 earthenware Inorganic materials 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000007763 reverse roll coating Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
イ、産業上の利用分野
本発明は、磁気記録媒体の製造方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method of manufacturing a magnetic recording medium.
口、従来技術
磁気記録媒体は、支持体上に磁性塗布液を塗布すること
によって得られるが、その塗布方式としては、ロールコ
ート、グラビアコート、エクストルージョンコートが一
般的である。この中でも、エクストルージョン（押し出
し）コートは、均一な塗布膜厚が得られるので優れてい
る。BACKGROUND OF THE INVENTION Magnetic recording media are obtained by coating a magnetic coating liquid on a support, and the coating methods generally include roll coating, gravure coating, and extrusion coating. Among these, extrusion coating is excellent because it provides a uniform coating thickness.
一方、磁気起呼媒体自体の改良が、近年、急速に進んで
いる結果、高ＢＥＴ値の酸化磁性粉やバリウムフェライ
ト材料等の使用が図られ、塗布液が高粘度化している。On the other hand, improvements in the magnetic excitation medium itself have progressed rapidly in recent years, resulting in the use of oxidized magnetic powders and barium ferrite materials with high BET values, and the viscosity of coating liquids has increased.
また、高密度化に対処するために、薄膜塗布を行いたい
、更には生産性を高めるため可能な限り高速で塗布した
いとの要望が高まっている。In addition, there is an increasing desire to perform thin film coating in order to cope with the increase in density, and furthermore, to perform coating at the highest possible speed in order to increase productivity.
ところで、主として磁気記録媒体の製造を目的としたエ
クストルージョンコート法における従来技術として、特
開昭５１−８４７７１号、同５８−１０４６６６号、同
６０−２３８１７９号公報記載のものが知られている。By the way, as a conventional technique in the extrusion coating method mainly for the purpose of manufacturing magnetic recording media, the techniques described in Japanese Patent Application Laid-open Nos. 51-84771, 58-104666, and 60-238179 are known.
上記のエクストルージョンコート法は、確かに均一な塗
布膜厚を得ることができるけれども、良好な塗布条件が
狭い範囲でしか得ることができず、前述のような、高粘
度、薄膜塗布および高速塗布条件下では、所望の塗布を
行い得ない。Although the extrusion coating method described above can certainly obtain a uniform coating film thickness, it is only possible to obtain good coating conditions in a narrow range, and it is difficult to achieve high viscosity, thin film coating, and high speed coating as described above. Under these conditions, the desired application cannot be achieved.
特に、塗布膜厚（乾燥後）が３μｍ以下の薄膜塗布を行
う場合に、液切れが生じて塗布性が悪く、カレンダー処
理前の表面粗さも悪い上、塗布速度も遅く、ドロップア
ウトが多くなる。また、ＲＦ小出力の電磁変換特性も悪
化する。In particular, when applying a thin film with a coating thickness (after drying) of 3 μm or less, liquid runs out, resulting in poor coating properties, poor surface roughness before calendering, slow coating speed, and frequent dropouts. . Furthermore, the electromagnetic conversion characteristics of small RF outputs also deteriorate.
ハ１発明の目的
本発明の目的は、薄膜塗布、均一塗布が可能で、塗布速
度が早く、またドロップアウトが少なくかつ電磁変換特
性の良好な媒体を製造可能な、磁気記録媒体の製造方法
を提供することである。C1. Purpose of the Invention The purpose of the present invention is to provide a method for manufacturing a magnetic recording medium that enables thin film coating, uniform coating, high coating speed, little dropout, and good electromagnetic conversion characteristics. It is to provide.
二０発明の構成
本発明は、磁性塗布液吐出口より磁性塗布液を連続的に
押し出して支持体上に前記磁性塗布液を塗布する磁気記
録媒体の製造方法において、前記磁性塗布液に燐酸エス
テル（レシチンを除く。）を含有せしめたことを特徴と
する磁気記録媒体の製造方法に係るものである。20 Structure of the Invention The present invention provides a method for manufacturing a magnetic recording medium in which a magnetic coating liquid is continuously extruded from a magnetic coating liquid discharge port to apply the magnetic coating liquid onto a support, in which a phosphate ester is added to the magnetic coating liquid. (excluding lecithin).
ホ、実施例 以下、本発明の詳細な説明する。E, Example The present invention will be explained in detail below.
第１図は押し出しコーター（エクストルーダー）１を示
す斜視図であり、第２図は第１図の■−■線矢視断面図
である。FIG. 1 is a perspective view showing an extrusion coater (extruder) 1, and FIG. 2 is a sectional view taken along the line ■--■ in FIG.
この押し出しコーター１は、先端（塗布面）の方がくさ
び状にすぼまった略直方体の形状をしており、コーター
本体２内に長手方向に向かって円筒形の液溜り３が形成
されている。この液溜り部３へと液導入口１０から矢印
Ａで示すように塗布液が導入される。液溜り３からコー
ター先端部へ向かってスリット（液送り孔）４が設けら
れ、スリット４の末端に吐液ロアが設けられている。液
溜り３へと導入された塗布液は、スリット４内を矢印日
のように押し出され、吐液ロアから矢印Ｃのように押し
出される。吐液ロアの上下にはエツジ面６が形成され、
このエツジ面６に沿って可とう性非磁性支持体８が矢印
りのように送られ、支持体８０表面に磁性塗料塗布層９
が形成される。This extrusion coater 1 has a substantially rectangular parallelepiped shape with the tip (applying surface) narrowed into a wedge shape, and a cylindrical liquid reservoir 3 is formed in the coater body 2 in the longitudinal direction. There is. A coating liquid is introduced into this liquid reservoir 3 from a liquid introduction port 10 as shown by arrow A. A slit (liquid feeding hole) 4 is provided from the liquid reservoir 3 toward the tip of the coater, and a liquid discharge lower is provided at the end of the slit 4. The coating liquid introduced into the liquid reservoir 3 is pushed out within the slit 4 as shown by the arrow C, and is pushed out as shown by the arrow C from the liquid discharge lower. Edge surfaces 6 are formed above and below the liquid discharging lower,
A flexible non-magnetic support 8 is fed along this edge surface 6 in the direction of the arrow, and a magnetic paint coating layer 9 is applied to the surface of the support 80.
is formed.
本発明者は、例えば上述のような押し出しコーターによ
る塗布を行うに際して、高粘度塗布液を薄膜で、しかも
高速に塗布するための手段を模索していた。そして、実
験、研究を積み重ねていく過程で、磁性塗料中にリン酸
エステルを含有させることが極めて有効であることを見
出したのであリン酸エステルにかかる顕著な効果が見ら
れた理由は必ずしも明らかでないが、これにより粘度低
下したこと等が寄与しているものと思われる。The present inventor has been searching for a means for applying a high viscosity coating liquid in a thin film and at high speed, for example, when performing coating using an extrusion coater as described above. In the process of repeated experiments and research, we discovered that incorporating phosphate esters into magnetic paints was extremely effective, so the reason why phosphate esters had such remarkable effects is not necessarily clear. However, it is thought that the reduction in viscosity and other factors contributed to this.
しかも、特筆すべきことは、他の塗布方法（リバースロ
ールコート等）では、磁性塗料中にリン酸エステル（レ
シチンを除く。）を入れても塗布性は改善されず、ＲＦ
小出力かえって劣化したのである。即ち、リン酸エステ
ル添加の効果は押し出し塗布法の場合に限って認められ
たのであり、この両者の結合によって特異的に塗布性改
善、ＲＦ出出力上上等効果を奏し得たのである。Moreover, it is noteworthy that with other coating methods (reverse roll coating, etc.), even if phosphate esters (excluding lecithin) are added to the magnetic paint, the coating properties are not improved, and RF
The small output actually deteriorated. That is, the effect of adding phosphate ester was observed only in the case of extrusion coating, and the combination of the two specifically improved coating properties and improved RF output power.
レシチンを磁性塗料中に含有させることは公知である。It is known to include lecithin in magnetic paints.
しかし、押し出し塗布法の場合には、レシチン含有の効
果は低く、本発明の製法とは効果に格段の相違があった
。この意味でも、本発明の効果は特筆すべきものといえ
る。However, in the case of the extrusion coating method, the effect of containing lecithin was low, and the effect was significantly different from that of the production method of the present invention. In this sense as well, the effects of the present invention can be said to be noteworthy.
次に、「リン酸エステル」について述べる。Next, "phosphoric acid ester" will be described.
リン酸エステルの磁性塗料中での含有量は、磁性粉１０
０重量部に対して、０．５重量部以上、６．０重量部以
下とすると好ましく、１．０重量部以上、３．０重量部
以下とすると更に好ましい。The content of phosphoric acid ester in the magnetic paint is 10% of the magnetic powder.
With respect to 0 parts by weight, it is preferably 0.5 parts by weight or more and 6.0 parts by weight or less, and more preferably 1.0 parts by weight or more and 3.0 parts by weight or less.
リン酸エステルは、下記一般式のように、リン酸の水酸
基（塩であってもよい。）を含んでいるものであればよ
い。The phosphoric acid ester may be any phosphoric acid ester as long as it contains a phosphoric acid hydroxyl group (which may be a salt) as shown in the general formula below.
Ｘ−０−１”ＯＨ
ＯＨ
廣
（Ｘ−０）、１”ＯＨ
更に、下記一般式で表されるリン酸エステルが好ましい
。X-0-1''OH OH Hiro (X-0), 1''OH Furthermore, a phosphoric acid ester represented by the following general formula is preferable.
Ｒ−０−（ＣＨ２ＣＨ２０）。−Ｐ−ＯＨ式中、Ｒはア
ルキル基、アルケニル基、アリール基もしくはアルキル
アリール基を表わし、好ましくは炭素原子数４〜３０個
である。また、アルケＡはＯＨ基またはＲ−Ｃｌ−（Ｃ
Ｈ２ＣＨ２０） Ｉ。R-0-(CH2CH20). In the -P-OH formula, R represents an alkyl group, an alkenyl group, an aryl group or an alkylaryl group, and preferably has 4 to 30 carbon atoms. In addition, Alke A is an OH group or R-Cl-(C
H2CH20) I.
を表わす。ｎは２〜５０の正数である。represents. n is a positive number from 2 to 50.
次に、リン酸エステルの具体例を挙げる。Next, specific examples of phosphoric acid esters will be given.
（Ｐ １ ） Ｃｌ８Ｈ３ＳＯ（ＣＨ２ＣＨ２０）Ｓ
ＰＯ（ＯＨ）２（Ｐ ２ ） ［Ｃｌ８Ｈ３５０（Ｃ
Ｈ２ＣＨ２０）５） ２ＰＯ（ＯＨ）（Ｐ３） Ｃ１
Ｈ１９＋０（ＣＨ２ＣＨ２０）９ＰＯ（ＯＨ）２（ＰＩ
３） ｉ−Ｃ＋６Ｈ３３−０−（ＣＩ−１ｚｃＨ２
０）ｓ−ＰＯ（ＯＨ）ｚ（Ｐ １６） ［ｉ−Ｃ＋６
Ｈ３３−０−（Ｃ）ｌｚｃＨｚＯ）ｓ） ２ＰＯ（ＯＨ
）なお、本発明で用いるリン酸エステルはアンモニウム
塩、有機アミン塩、アルカリ金属塩、アルカリ土類金属
塩等の塩の形であってよい。(P 1 ) Cl8H3SO(CH2CH20)S
PO(OH)2(P2) [Cl8H350(C
H2CH20)5) 2PO(OH)(P3) C1
H19+0(CH2CH20)9PO(OH)2(PI
3) i-C+6H33-0-(CI-1zcH2
0) s-PO(OH)z(P 16) [i-C+6
H33-0-(C)lzcHzO)s) 2PO(OH
) The phosphoric acid ester used in the present invention may be in the form of a salt such as an ammonium salt, an organic amine salt, an alkali metal salt, or an alkaline earth metal salt.
次に、他の押し出し塗布法を例示する。Next, another extrusion coating method will be illustrated.
第３図は他の押し出しコーター１６を示す要部拡大断面
図である。FIG. 3 is an enlarged sectional view of a main part of another extrusion coater 16.
この押し出しコーター１６は、上流側表面にフロントエ
ツジ面１１、下流側表面にバックェツジ面１２を有し、
それらの間に塗布液溜り（図示省略）に連通ずるスリッ
ト１３を有している。This extrusion coater 16 has a front edge surface 11 on the upstream surface and a back edge surface 12 on the downstream surface,
A slit 13 communicating with a coating liquid reservoir (not shown) is provided between them.
フロントエツジ面１１の下流端日における接線！１より
、バックェツジ１２の一部が突出（第３図ではほぼ上方
に突出）するようにしている。Tangent line at the downstream end of the front edge surface 11! 1, a part of the back wedge 12 protrudes (almost upwardly in FIG. 3).
支持体は、矢印Ｅで示すように、フロントエツジ１１に
沿ってせり上りから下流端Ｂを通って、スリット１３及
び塗布液吐出口１４を越えて、バックェツジ面１２の塗
布液槽厚分上方をめぐりながら右方へ抜けて行く。As shown by arrow E, the support rises along the front edge 11, passes through the downstream end B, crosses the slit 13 and the coating liquid discharge port 14, and extends above the back edge surface 12 by the thickness of the coating liquid tank. Go around and exit to the right.
第３図の押し出しコーターでは、前記１．と、下流端Ｂ
を通りバックェツジ面を結ぶ線１３とのなす角度をα２
、前記！１と、バックェツジ面１２α２〈α、 ＜ １
８０’
バックェツジ面１２の曲率半径ｒは、３〜１０ｍｍが好
ましい。In the extrusion coater of FIG. 3, the above-mentioned 1. and downstream end B
The angle formed by the line 13 passing through and connecting the back plane is α2
, Said! 1 and the back plane 12α2〈α, < 1
80' The radius of curvature r of the backing surface 12 is preferably 3 to 10 mm.
磁性塗料の粘度は１００〜３０００ｃ Ｐが好ましい。The viscosity of the magnetic paint is preferably 100 to 3000 cP.
また、塗布速度を２ｏｏｍ１分以上とすると、本発明に
よる効果が特に顕著となる。Further, when the coating speed is set to 2 ooms for 1 minute or more, the effects of the present invention become particularly remarkable.
次に、磁性塗料の材料等について述べる。Next, the materials for the magnetic paint will be described.
磁性塗料中のバインダー樹脂として少なくともポリウレ
タンを使用できるが、これは、ポリオールとポリイソシ
アネートとの反応によって合成できる。ポリウレタンと
共に、フェノキシ樹脂及び／又は塩化ビニル系共重合体
も含有せしめれば、磁性層に適用する場合に磁性粉の分
散性が向上し、その機械的強度が増大する。また、使用
される磁性粉末、特に強磁性粉末としては、γ−Ｆｅｚ
Ｏ３、Ｃｏ含有７ Ｆｅｗ ｏ３ 、Ｆｅ３Ｏ４、Ｃ
ｏ含有Ｆｅ５Ｏｎ等の酸化鉄磁性粉；Ｆｅ、Ｎｉ、Ｃｏ
、Ｆｅ−Ｎｉ−Ｃｏ合金、Ｆｅ−Ｎｉ合金、ＦｅＡ１合
金、Ｆｅ−Ａｎ！−Ｎｉ合金、Ｆｅ−Ａｊ２Ｃｏ合金、
Ｆｅ−Ｍｎ−Ｚｎ合金、Ｆｅ−ＮｉＺｎ合金、Ｆ ｅ−
Ａｎ−Ｎ １−Ｃｏ合金、Ｆｅ−Ａｌ１−Ｎｉ−Ｃｒ合
金、Ｆｅ−Ａｌ１−Ｃｏ−Ｃｒ合金、Ｆｅ−Ｃｏ−Ｎｉ
−Ｃｒ合金、Ｆｅ−Ｃ。At least polyurethane can be used as a binder resin in magnetic coatings, which can be synthesized by reaction of polyols and polyisocyanates. If a phenoxy resin and/or a vinyl chloride copolymer is contained together with polyurethane, the dispersibility of the magnetic powder will be improved when applied to a magnetic layer, and its mechanical strength will be increased. In addition, the magnetic powder used, especially the ferromagnetic powder, is γ-Fez
O3, Co containing 7 Few o3, Fe3O4, C
Iron oxide magnetic powder such as Fe5On containing o; Fe, Ni, Co
, Fe-Ni-Co alloy, Fe-Ni alloy, FeA1 alloy, Fe-An! -Ni alloy, Fe-Aj2Co alloy,
Fe-Mn-Zn alloy, Fe-NiZn alloy, Fe-
An-N 1-Co alloy, Fe-Al1-Ni-Cr alloy, Fe-Al1-Co-Cr alloy, Fe-Co-Ni
-Cr alloy, Fe-C.
Ｎ１−Ｐ合金、Ｃｏ−Ｎｉ合金等Ｆｅ、Ｎｉ。N1-P alloy, Co-Ni alloy, etc. Fe, Ni.
Ｃｏ等を主成分とするメタル磁性粉等各種の強磁性粉が
挙げられる。Examples include various ferromagnetic powders such as metal magnetic powders containing Co or the like as a main component.
磁性塗料中にはまた、潤滑剤（例えばシリコ−苔す
脂肪酸（例えばステアリン酸）や、炭素原子総数１３〜
４０個の脂肪酸エステル等、研磨剤（例えば溶融アルミ
ナ）、帯電防止剤（例えばカーボンブラック、グラファ
イト）等を添加してよい。Magnetic paints also contain lubricants, such as silico-alpha fatty acids (e.g. stearic acid), and magnetic coatings with a total number of carbon atoms ranging from 13 to
40 fatty acid esters, abrasives (eg, fused alumina), antistatic agents (eg, carbon black, graphite), etc. may be added.
また、支持体の素材としては、ポリエチレンテレフタレ
ート、ポリプロピレン等のプラスチック、Ａ１．、Ｚｎ
等の金属、ガラス、ＢＮ、、Ｓｉカーバイド、磁器、陶
器等のセラミックなどが使用される。磁性層とは反対側
の支持体面にバックコート層を設けてもよい。Materials for the support include plastics such as polyethylene terephthalate and polypropylene, A1. ,Zn
Metals such as glass, BN, Si carbide, ceramics such as porcelain and earthenware, etc. are used. A back coat layer may be provided on the support surface opposite to the magnetic layer.
上記の磁性層の塗布形成時には、塗料中に架橋剤として
の多官能イソシアネートを所定量添加してもよい。When forming the magnetic layer by coating, a predetermined amount of a polyfunctional isocyanate as a crosslinking agent may be added to the coating material.
なお、陰性官能基含有樹脂の商品名としては、ｒ ４０
０Ｘ１１０ ＡＪ （日本ゼオン社製）、ｒＭＲｌｌ
ｏＪ（日本ゼオン社製）、ｒ Ｔ Ｔ Ｍ −３００５
Ｊ（三洋化成社製） 、 ｒ Ｕ Ｒ−８３００Ｊ 、
ｒ Ｕ Ｒ−８６００Ｊ、「バイロン５３０Ｊ （
東洋紡社製）等が挙げられる。The product name of the negative functional group-containing resin is r40.
0X110 AJ (manufactured by Zeon Corporation), rMRll
oJ (manufactured by Zeon Corporation), rTTM-3005
J (manufactured by Sanyo Chemical Co., Ltd.), rUR-8300J,
r U R-8600J, “Byron 530J (
manufactured by Toyobo Co., Ltd.).
以下、具体的な実験例について説明するが、本発明の実
施の態様はこれにより限定されない。なお、「部」は「
重量部」を表すものとする。Hereinafter, specific experimental examples will be described, but the embodiments of the present invention are not limited thereto. In addition, "department" is "
"parts by weight".
まず、支持体上に磁性層を次の要領で形成した。First, a magnetic layer was formed on a support in the following manner.
７ Ｆｅｚ（Ｌ＋ １００
部（Ｈｃ、 ７０００ｅ、ＢＥＴ値２５ｒｒｒ／ｇ）
ウレタン樹脂 ７部（日本
ポリウレタン社製のＮ３１３２）塩化ビニル−酢酸ビニ
ル共重合体 ２０部（ユニオンカーバイド社製の
ＶＡＧＨ）アルミナ粉末（α−ＡＩ！、２０３）
１０部ステアリン酸 ０．
３５部オレイン酸 ０．６
５部ステアリン酸ブチル １部ポ
リイソシアネート １０部トルエン
１５０部メチルエチル
ケトン １５０部カーボンブラック
５部レシチン又はリン酸エス
テル ２部上記に示す成分からなる処方で
ボールミルに仕込み、分散させた後、この磁性塗料を１
μｍフィルターで濾過し、コロネートしく日本ポリウレ
タン社製）を添加し、ポリエチレンテレフタレートフィ
ルム（厚さ１５μｍ）上に乾燥厚さ４．０μｍに塗布し
、乾燥してスーパーカレンダーをかけ、２インチ幅にス
リットしてビデオテープを作成した。7 Fez(L+100
(Hc, 7000e, BET value 25rrr/g)
Urethane resin 7 parts (N3132 manufactured by Nippon Polyurethane Co., Ltd.) Vinyl chloride-vinyl acetate copolymer 20 parts (VAGH manufactured by Union Carbide Co.) Alumina powder (α-AI!, 203)
10 parts stearic acid 0.
35 parts oleic acid 0.6
5 parts Butyl stearate 1 part Polyisocyanate 10 parts Toluene 150 parts Methyl ethyl ketone 150 parts Carbon black 5 parts Lecithin or phosphoric acid ester 2 parts After charging the formulation consisting of the above ingredients into a ball mill and dispersing, 1 part of this magnetic paint
Filtered with a μm filter, added Coronate (manufactured by Nippon Polyurethane Co., Ltd.), coated on polyethylene terephthalate film (thickness 15 μm) to a dry thickness of 4.0 μm, dried, supercalendered, and slit into 2 inch width. and created a videotape.
但し、各側において、塗布方法、塗布速度はそれぞれ変
化させた（下記表に示す。）。また、各ビデオテープに
は下記に示すリン酸エステルを含有させ、又はレシチン
を含有させた。However, the coating method and coating speed were varied on each side (as shown in the table below). Furthermore, each videotape contained a phosphoric acid ester or lecithin as shown below.
上下がった出力をドロップアラ ト１個として、全長測定し、１ 分間あたりの平均値を求めた。Drop the output that has gone up or down Measure the entire length as one piece, The average value per minute was calculated.
平均表面粗さＲａ：
小板研究所製の三次元表面粗さ計（３ＦＫ）にて測定し
た（カットオフは０．２５ｍｍ）。Average surface roughness Ra: Measured using a three-dimensional surface roughness meter (3FK) manufactured by Koita Research Institute (cutoff: 0.25 mm).
（以下余白）
磁性塗料ａ
レシチン
これら各ビデオテープについて、ＲＦ比出力ドロップア
ウト、カレンダー処理前の磁性層の平均表面粗さを測定
した。測定結果は下記表に示す。(The following is a blank space) Magnetic paint a Lecithin For each of these videotapes, the RF specific output dropout and the average surface roughness of the magnetic layer before calendering were measured. The measurement results are shown in the table below.
これらの測定方法は以下に示す。These measurement methods are shown below.
ＲＦ比出力ビクターＨＲ−３７０００にて測定した。RF specific output was measured using Victor HR-37000.
ドロップアウト：日本ビクター社製ドロップアウトカウ
ンターＶＤ−５Ｍを使用
し、１５ ｐ ｓｅｃ以上長く、かつＲＦエンヘロープ
の出力の２０ｄＢ以
上記表から解るように、実施例によれば、電磁変換特性
が高く、ドロップアウトも少なく、平均表面粗さも良好
であり、塗布速度も比較例の押し出しコーターよりも向
上している。Dropout: Dropout counter VD-5M manufactured by Victor Company of Japan was used, and as can be seen from the table, the electromagnetic conversion characteristics were high, as can be seen from the table. There are fewer dropouts, the average surface roughness is also good, and the coating speed is also improved compared to the extrusion coater of the comparative example.
これに対し、押し出しコーターによる塗布を行った場合
、レシチンを磁性塗料に含有させても諸これらのことか
ら、本発明の構成による相乗的効果の存在は明らかであ
る。On the other hand, when coating is performed using an extrusion coater, even if lecithin is contained in the magnetic coating material, it is clear from the above that there is a synergistic effect due to the structure of the present invention.
へ４発明の効果
本発明に係る磁気記録媒体の製造方法によれば、磁性塗
布液吐出口より磁性塗布液を連続的に押し出す際に、こ
の磁性塗布液にリン酸エステルを含有させた。そして、
これによる磁性塗布液の物性変化から、塗布性が改善さ
れ、塗布速度の向上、磁気記録媒体のドロップアウトの
低減、電磁変換特性の向上が達成できた。According to the method for manufacturing a magnetic recording medium according to the present invention, when the magnetic coating liquid is continuously extruded from the magnetic coating liquid discharge port, the magnetic coating liquid contains a phosphate ester. and,
As a result of this change in the physical properties of the magnetic coating liquid, coating properties were improved, coating speed was increased, dropout of the magnetic recording medium was reduced, and electromagnetic conversion characteristics were improved.
図面は実施例を示すものであって、
第」図は押し出しコーター（エクストルーダー）の斜視
図、
第２図は第１図の■−■線矢視断面図、第３図は他の押
し出しコーターを示す要部拡大断面図
である。
なお、図面に示す符号において、
１．１６・・・・・・・・・押し出しコーター３・・・
・・・・・・液溜り
４．１３・・・・・・・・・スリット
６．１１．１２・・・・・・・・・エツジ面７．１４・
・・・・・・・・磁性塗布液吐出口８・・・・・・・・
・非磁性支持体
である。
代理人 弁理士 通板 宏The drawings show examples, and Figure 1 is a perspective view of an extrusion coater (extruder), Figure 2 is a sectional view taken along the line ■-■ of Figure 1, and Figure 3 is a diagram of another extrusion coater. FIG. 2 is an enlarged sectional view of main parts. In addition, in the symbols shown in the drawings, 1.16...Extrusion coater 3...
...Liquid pool 4.13...Slit 6.11.12...Edge surface 7.14.
......Magnetic coating liquid discharge port 8...
・It is a non-magnetic support. Agent Patent Attorney Hiroshi Tsuita
Claims (1)
して支持体上に前記磁性塗布液を塗布する磁気記録媒体
の製造方法において、前記磁性塗布液に燐酸エステル（
レシチンを除く。）を含有せしめたことを特徴とする磁
気記録媒体の製造方法。1. A method for manufacturing a magnetic recording medium in which a magnetic coating liquid is continuously extruded from a magnetic coating liquid discharge port to apply the magnetic coating liquid onto a support, in which a phosphate ester (
Excludes lecithin. ) A method for manufacturing a magnetic recording medium, characterized in that the medium contains:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071989A JPH02192022A (en) | 1989-01-19 | 1989-01-19 | Production of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071989A JPH02192022A (en) | 1989-01-19 | 1989-01-19 | Production of magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02192022A true JPH02192022A (en) | 1990-07-27 |
Family
ID=11758102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1071989A Pending JPH02192022A (en) | 1989-01-19 | 1989-01-19 | Production of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02192022A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6780494B2 (en) | 2002-03-07 | 2004-08-24 | Tdk Corporation | Ceramic electronic device and method of production of same |
-
1989
- 1989-01-19 JP JP1071989A patent/JPH02192022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6780494B2 (en) | 2002-03-07 | 2004-08-24 | Tdk Corporation | Ceramic electronic device and method of production of same |
| US7131174B2 (en) | 2002-03-07 | 2006-11-07 | Tdk Corporation | Ceramic electronic device and method of production of same |
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