JPH0465597A - Ink strike through-inhibitor and light weight paper using the inhibitor - Google Patents
Ink strike through-inhibitor and light weight paper using the inhibitorInfo
- Publication number
- JPH0465597A JPH0465597A JP17703290A JP17703290A JPH0465597A JP H0465597 A JPH0465597 A JP H0465597A JP 17703290 A JP17703290 A JP 17703290A JP 17703290 A JP17703290 A JP 17703290A JP H0465597 A JPH0465597 A JP H0465597A
- Authority
- JP
- Japan
- Prior art keywords
- inhibitor
- paper
- magnesium sulfate
- basic magnesium
- ink
- 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
- 239000003112 inhibitor Substances 0.000 title abstract description 13
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 44
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 22
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 10
- 239000004480 active ingredient Substances 0.000 claims abstract description 4
- 238000004438 BET method Methods 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 230000002265 prevention Effects 0.000 claims description 5
- 230000003449 preventive effect Effects 0.000 claims 2
- 239000002245 particle Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 7
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 7
- 235000012239 silicon dioxide Nutrition 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野］
本発明は、軽量紙のインキ裏抜は防止剤およびこれを用
いた軽量紙に関し、さらに詳しくは微細な繊維状塩基性
硫酸マグネシウムをインキ裏抜は防止剤として含有する
軽量紙に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an agent for preventing ink bleed-through on lightweight paper and lightweight paper using the same. This relates to lightweight paper containing an anti-bleeding agent.
〔従来の技術］
近年、祇パルプ用の良質原木が入手困難となるに伴って
印刷後における不透明度の低い化学ノぐｌレプの使用が
増大してきた。゛また、運送費、人件費等の上昇により
特に、新聞用紙等を薄手、軽量にする傾向が強まってい
る。[Prior Art] In recent years, as it has become difficult to obtain high-quality logs for making pulp, the use of chemical wood pulp, which has low opacity after printing, has increased. Furthermore, due to rising transportation costs, labor costs, etc., there is a growing trend to make newsprint and other materials thinner and lighter.
この種の薄手軽量紙を用いて印刷するとインキが紙面の
裏側まで抜けるため、これを防止すべく各種のインキ裏
抜は防止剤を内填する軽量紙の開発が進められており、
特定粒子状態の水和珪酸や尿素樹脂粉末などがインキ裏
抜は防止剤として利用されている。When printing with this type of thin, lightweight paper, the ink bleeds through to the back side of the paper, so in order to prevent this, various types of lightweight paper are being developed that contain agents to prevent ink bleed-through.
Hydrated silicic acid in the form of specific particles, urea resin powder, etc. are used as ink strike-through prevention agents.
［発明が解決しようとする課題〕
従来の軽量紙で利用されている無機系のインキ裏抜は防
止剤として、クレイやタルクなと天然産の珪酸塩微細粉
末が用いられていたが、近時、水和珪酸が優れていると
ころから、多用されるに至っている。[Problem to be solved by the invention] Clay, talc, and naturally produced silicate fine powders have been used as inhibitors to prevent inorganic ink from bleed-through in conventional lightweight paper. Due to its superior properties, hydrated silicic acid has come to be widely used.
しかしながら、水和珪酸は硬度が比較的大きくかつ凝集
した二次粒子であるなどの固有物性に起因して紙の摩擦
係数を増大させる傾向が強い。このことは抄紙機の損耗
を招き、また抄速増大のネックともなるために、添加量
が制限され、従って紙の軽量化にも自ら限度があった。However, hydrated silicic acid has a strong tendency to increase the coefficient of friction of paper due to its inherent physical properties such as relatively high hardness and agglomerated secondary particles. This causes wear and tear on the paper machine and also becomes a bottleneck in increasing the papermaking speed, so the amount added is limited, and therefore there is a limit to the weight reduction of paper.
また、水和珪酸の一次粒子は微細な球状粒子であるため
、パルプに対する歩留りにも限度がある。Furthermore, since the primary particles of hydrated silicic acid are fine spherical particles, there is a limit to the yield of the hydrated silicic acid in pulp.
一方、尿素樹脂粉末は、水和珪酸と同様にインキ裏抜は
防止効果が優れており、紙の摩擦係数を増大させる傾向
も少ないが、著しく高価であるという欠点がある。On the other hand, urea resin powder, like hydrated silicic acid, has an excellent effect of preventing ink strike-through and has little tendency to increase the coefficient of friction of paper, but it has the drawback of being extremely expensive.
本発明者らは、上記従来技術の問題点を解決するために
各種の実験研究を重ねた結果、従来のインキ裏抜は防止
剤とは全く異なる粒子状態の繊維杖塩基性硫酸マグネシ
ウムが紙のインキ裏抜は防止剤として極めて有効かつ実
用的であることを見出し、本発明を完成した。The inventors of the present invention have repeatedly conducted various experimental studies to solve the above-mentioned problems of the conventional technology. As a result, it has been found that in conventional ink bleed-through, fiber cane basic magnesium sulfate, which is in a particle state completely different from that of the inhibitor, is used for printing paper. The present invention was completed based on the discovery that ink strike-through is extremely effective and practical as an inhibitor.
したがって、本発明の目的は、紙に優れたインキ裏抜は
防止効果と同時に平滑性を付与し、しかも比較的安価で
実用的な新規のインキ裏、抜は防止剤を提供することに
より、より軽量で生産性のよい軽量紙を実現することに
ある。Therefore, an object of the present invention is to provide a novel ink backing and bleeding prevention agent that provides excellent ink bleeding prevention effect and smoothness to paper, and is relatively inexpensive and practical. The goal is to create lightweight paper that is lightweight and has good productivity.
上記の目的を達成するための本発明によるインキ裏抜は
防止剤は、微細な繊維状塩基性硫酸マグネシウムを有効
成分としてなることを構成上の特徴とする。The ink strike-through prevention agent according to the present invention for achieving the above object is characterized in that it contains fine fibrous basic magnesium sulfate as an active ingredient.
さらに、本発明で提供される軽量紙は、パルプ繊維にイ
ンキ裏抜は防止剤として微細な繊維状塩基性硫酸マグネ
シウムを含有させてなることを特徴とするものである。Furthermore, the lightweight paper provided by the present invention is characterized in that the pulp fibers contain fine fibrous basic magnesium sulfate as an ink strike-through preventing agent.
本発明の軽量紙は、主として新聞用紙、雑誌用紙等を対
象とするが、多量に印刷され軽量化を必要とする各種の
印刷用紙は何れも対象となる。The lightweight paper of the present invention is mainly intended for newsprint paper, magazine paper, etc., but it is also applicable to all kinds of printing papers that are printed in large quantities and need to be lightweight.
以下、本発明につき詳述する。The present invention will be explained in detail below.
本発明に係る繊維状塩基性硫酸マグネシウムは、５Ｍｇ
０−Ｍｇ５Ｏａ ・８Ｈ，Ｏに近い化学組成を有する
塩基性硫酸マグネシウムの微細な繊維状結晶粒子であっ
て、Ｘ線回折および電子顕微鋺で粒子特性や結晶性を確
認することができる。The fibrous basic magnesium sulfate according to the present invention is 5Mg
It is a fine fibrous crystal particle of basic magnesium sulfate having a chemical composition close to 0-Mg5Oa .8H,O, and its particle characteristics and crystallinity can be confirmed by X-ray diffraction and electron microscopy.
この繊維状物質は、製造条件によって異なるけれども太
さ０．０５〜１μ、好ましくは０．１−１１、長さ５〜
３００−１好ましくは５〜１５０ ｎの範囲にある白色
微粒子である。This fibrous substance has a thickness of 0.05 to 1μ, preferably 0.1 to 11μ, and a length of 5 to 1μ, although it varies depending on the manufacturing conditions.
300-1 are white fine particles preferably in the range of 5 to 150 nm.
このような繊維状塩基性硫酸マグネシウムは、上記のよ
うな極めて細かい結晶性繊維粒子から成るため、個々の
粒子は表面が平滑で柔軟性に富み、粉体としては比表面
積が５〜３ｏ■２／ｇ程度であるにも拘らず著しく嵩高
で吸水性、吸油性に富むという特徴があり、紙のインキ
裏抜は防止剤として優れた効果を発揮する。Since such fibrous basic magnesium sulfate is composed of extremely fine crystalline fiber particles as described above, each particle has a smooth surface and is highly flexible, and as a powder, the specific surface area is 5 to 3o2. /g, it is extremely bulky and has high water and oil absorption properties, and exhibits an excellent effect as an inhibitor against ink bleed-through on paper.
繊維状塩基性硫酸マグネシウムは、それ自体は公知であ
り前記物性を有するものであればインキ裏抜は防止剤と
して適用できることはもちろんであるが、本発明者らが
開発した製法（特願平ｌ−２５５１６８号）に基づいて
得られるものが実用的で好ましいゆ
なお、本発明に係るインキ裏抜は防止剤を使用するに当
っては、繊維状塩基性硫酸マグネシウムの単独ばかりで
なく、水和珪酸などの従来の裏抜は防止剤と併用しても
何んら差支えない。Fibrous basic magnesium sulfate is known per se, and if it has the above-mentioned physical properties, it can of course be applied as an agent for preventing ink bleed-through. However, when using the ink bleed-out inhibitor according to the present invention, it is necessary to use not only fibrous basic magnesium sulfate alone, but also hydrated basic magnesium sulfate. Conventional backing such as silicic acid can be used in combination with inhibitors without any problems.
本発明の軽量紙は、前記繊維状塩基硫酸マグ不ソウムを
なるべく水性スラリーの状態でインキ裏抜は防止材を添
加している軽量紙の製紙工程において紙料に添加し、抄
造することにより得ることができる。例えば、チエスト
、ビータ−、ファンポンプ、ワイヤーパートの何れの過
程でも添加でき、従来量も歩留りが劣るとされているビ
ータ−以後ファンポンプ間の紙料スラリーに添加しても
十分に留まる。The lightweight paper of the present invention is obtained by adding the above-mentioned fibrous base sulfuric acid to the paper stock in the papermaking process of lightweight paper, preferably in the form of an aqueous slurry, and adding a material to prevent ink bleed-through. be able to. For example, it can be added to any of the processes of the cheese, beater, fan pump, and wire part, and even if it is added to the paper stock slurry between the beater and the fan pump, where the conventional yield is said to be poor, the amount remains sufficiently.
すなわち、本発明に係る塩基性硫酸マグネシウムの微細
な繊維状とパルプ繊維との親和性のため歩留りは著しく
良好なので、紙料パルプに対する添加量は裏抜は防止作
用として０．１〜５重量％、好ましくは０．５〜３重量
％程度が適量となる。０゜１重量％以下ではインキ裏抜
は防止効果が不充分であり、５重量％以上では保水性が
過多となって湿紙の乾燥工程が非能率となる。That is, the yield is extremely good due to the fine fibrous form of basic magnesium sulfate according to the present invention and its affinity with pulp fibers, so the amount added to the stock pulp is 0.1 to 5% by weight to prevent bleed-out. , preferably about 0.5 to 3% by weight. If it is less than 0.1% by weight, the effect of preventing ink strike-through will be insufficient, and if it is more than 5% by weight, the water retention will be too high and the wet paper drying process will be inefficient.
なお、前記塩基性硫酸マグネシウムは裏抜は防止剤とし
ての使用ではなく、パルプ繊維の代替として任意な量で
使用することもできる。Note that the basic magnesium sulfate is not used as an anti-bleeding agent, but can also be used in any amount as a substitute for pulp fibers.
多量に配合することにより、難燃紙および無機繊維紙と
しての特徴を付与させることができる。By blending in a large amount, characteristics of flame retardant paper and inorganic fiber paper can be imparted.
本発明に係る塩基性硫酸マグネシウムは、微細な繊維状
白色結晶粒子であって、パルプ繊維に対し親和性かつ吸
油量も比較的大であるため軽量紙のインキ裏抜は防止剤
として効果的に機能する。The basic magnesium sulfate according to the present invention is a fine fibrous white crystal particle, and has an affinity for pulp fibers and a relatively large oil absorption amount, so it is effective as an agent for preventing ink bleed-through on lightweight paper. Function.
［実施例］
以下、実施例によって更に具体的に本発明を説明するが
、実施例において用いた塩基性硫酸マグネシウムは次の
方法４二よって製造した。[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples. The basic magnesium sulfate used in the Examples was manufactured by the following method 42.
く試料の合成〉
水１００ ｉ！に硫酸マグネシウム７水塩１２．１重量
部を溶解させ、次いで見掛は比重１．７５ｇ／ｃｃのマ
グネシアクリンカ−粉末２．０重量部を分散させてスラ
リーを得た。このスラリーはＭｇＯとして１．８重量％
の酸化マグネシウム粉末を含むものであった。Sample synthesis> Water 100i! 12.1 parts by weight of magnesium sulfate heptahydrate was dissolved in the solution, and then 2.0 parts by weight of magnesia clinker powder having an apparent specific gravity of 1.75 g/cc was dispersed therein to obtain a slurry. This slurry is 1.8% by weight as MgO.
of magnesium oxide powder.
次に該スラリーを約１００°Ｃで２４時間反応させた。The slurry was then reacted at about 100°C for 24 hours.
反応終了後、固形分を母液から分離し、水洗し、微細繊
維の集合体である約２００−の均一粒子からなる繭状塩
基性ｇＭマグネシウムを得た。After completion of the reaction, the solid content was separated from the mother liquor and washed with water to obtain a cocoon-like basic magnesium consisting of uniform particles of about 200 g, which are aggregates of fine fibers.
二〇住成物を水６０ｆ中に分散させ、示モジナイザーで
５分間強力剪断処理を施した後、沈降分離によって未解
砕の繭状粒子及び未反応粗粒子を分級除去し、解繊され
た繊維状塩基性ｇ酸マグネシウムを１濾過により回収し
、常法により乾燥及び粉砕した。20 The composition was dispersed in 60f of water, subjected to strong shearing treatment for 5 minutes with a demonstrator, and undisintegrated cocoon-like particles and unreacted coarse particles were classified and removed by sedimentation separation, and the fibers were defibrated. The fibrous basic magnesium oxide was recovered by 1 filtration, dried and ground by conventional methods.
得られた繊維状塩基性硫酸マグネシウムは、直径的０．
４ｎ、長さ３０〜１００−、アスペクト比２０〜１５０
の繊維状粒子からなる嵩高の粉体であり、見掛は比重０
．１ ｇ／ｃｃ、 Ｂ ＥＴ法による比表面積２１．Ｏ
ｓ”／ｇであった・
実施例１〜２
インキ裏抜は防止剤として試料の塩基性硫酸マグネシウ
ムを水中に分散させて５ｗｔ％の水性スラリーとし、Ｊ
ＩＳパルプ解離機（回転数３０００ｒｐｍ）で２分間解
離させたＳＰパルプ２ ｇ／１ｏｏｃｃのパルプスラリ
ー２．５２に、５ Ｍ ｇ Ｏ・Ｍ ｇ Ｓ Ｏ４・８
Ｈ２０として０．５ ｇ （パルプに対し１重量％）に
相当する量を添加し、３０秒撹拌した。The obtained fibrous basic magnesium sulfate has a diameter of 0.
4n, length 30-100-, aspect ratio 20-150
It is a bulky powder consisting of fibrous particles with an apparent specific gravity of 0.
．． 1 g/cc, specific surface area by BET method 21. O
s''/g. Examples 1 to 2 For ink strike-through, a sample of basic magnesium sulfate was dispersed in water as an inhibitor to make a 5 wt% aqueous slurry, and J
SP pulp 2 g/1oocc pulp slurry 2.52 which was dissociated for 2 minutes with an IS pulp dissociator (rotation speed 3000 rpm) was added with 5 M g O・M g SO4・8
An amount equivalent to 0.5 g (1% by weight based on the pulp) of H20 was added and stirred for 30 seconds.
その後、硫酸アルミニウムの水溶液を添加し、３０秒間
撹拌して水で８２に稀釈し、よく混合したのち角型抄紙
機で抄紙した。以下、同様の操作で試料１．０ｇ（パル
プに対し２重置％）およびタルクを添加して抄紙した。Thereafter, an aqueous solution of aluminum sulfate was added, stirred for 30 seconds, diluted to 82% with water, mixed well, and then made into paper using a square paper machine. Thereafter, 1.0 g of the sample (double loading % with respect to the pulp) and talc were added and paper was made in the same manner.
得られた成紙の物性値を測定し、その結果を第１表に示
した。The physical properties of the obtained paper were measured and the results are shown in Table 1.
本発明に係る軽量紙のインキ裏抜は防止剤は、従来のも
のとは異なった特異な物性をもつ微細な繊維状塩基性硫
酸マグネシウムの白色結晶粒子である。The ink bleed-through inhibitor for lightweight paper according to the present invention is fine fibrous white crystalline particles of basic magnesium sulfate that have unique physical properties different from conventional ones.
これを配合した軽量紙はインキ裏抜は減少率が高く、か
つ従来の軽量紙よりも紙屑間の滑りも良好で扱い易いも
のとなる。Lightweight paper containing this compound has a high rate of reduction in ink bleed-through, and has better slippage between paper waste than conventional lightweight paper, making it easier to handle.
出願人 日本化学工業株式会社 代理人 弁理士 高 畑 正 也Applicant: Nippon Chemical Industry Co., Ltd. Agent: Patent Attorney Masaya Takahata
Claims (1)
するインキ裏抜け防止剤。 ２、微細な繊維状塩基性硫酸マグネシウムが、直径０．
０５〜１μｍ、長さ５〜３００μｍおよびＢＥＴ法によ
る比表面積５〜３０ｍ＾２／ｇである請求項１記載のイ
ンキ裏抜け防止剤。 ３、パルプ繊維にインキ裏抜け防止剤として微細な塩基
性硫酸マグネシウムを含有させてなることを特徴とする
軽量紙。 ４、微細な塩基性硫酸マグネシウムが、紙料パルプに対
し０．１〜５ｗｔ％含有されている請求項３記載の軽量
紙。[Claims] 1. An ink strike-through prevention agent containing fine fibrous basic magnesium sulfate as an active ingredient. 2. Fine fibrous basic magnesium sulfate has a diameter of 0.
The ink bleed-through preventive agent according to claim 1, which has a length of 0.05 to 1 μm, a length of 5 to 300 μm, and a specific surface area of 5 to 30 m^2/g by the BET method. 3. A lightweight paper characterized by containing fine basic magnesium sulfate as an ink bleed-through preventive agent in pulp fibers. 4. The lightweight paper according to claim 3, wherein the fine basic magnesium sulfate is contained in an amount of 0.1 to 5 wt% based on the paper stock pulp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17703290A JP2829939B2 (en) | 1990-07-03 | 1990-07-03 | Ink strikethrough inhibitor and lightweight paper using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17703290A JP2829939B2 (en) | 1990-07-03 | 1990-07-03 | Ink strikethrough inhibitor and lightweight paper using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0465597A true JPH0465597A (en) | 1992-03-02 |
| JP2829939B2 JP2829939B2 (en) | 1998-12-02 |
Family
ID=16023958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17703290A Expired - Fee Related JP2829939B2 (en) | 1990-07-03 | 1990-07-03 | Ink strikethrough inhibitor and lightweight paper using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2829939B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005075849A (en) * | 2003-08-28 | 2005-03-24 | Konica Minolta Holdings Inc | Ink, recording method and inkjet recording method |
| JP2009280422A (en) * | 2008-05-20 | 2009-12-03 | Ube Material Industries Ltd | Method for producing fibrous basic magnesium sulfate particle |
-
1990
- 1990-07-03 JP JP17703290A patent/JP2829939B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005075849A (en) * | 2003-08-28 | 2005-03-24 | Konica Minolta Holdings Inc | Ink, recording method and inkjet recording method |
| JP2009280422A (en) * | 2008-05-20 | 2009-12-03 | Ube Material Industries Ltd | Method for producing fibrous basic magnesium sulfate particle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2829939B2 (en) | 1998-12-02 |
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