JPS6242080B2 - - Google Patents
Info
- Publication number
- JPS6242080B2 JPS6242080B2 JP54173739A JP17373979A JPS6242080B2 JP S6242080 B2 JPS6242080 B2 JP S6242080B2 JP 54173739 A JP54173739 A JP 54173739A JP 17373979 A JP17373979 A JP 17373979A JP S6242080 B2 JPS6242080 B2 JP S6242080B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- vinyl acetate
- pva
- sizing
- present
- 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.)
- Expired
Links
- 238000004513 sizing Methods 0.000 claims description 17
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 13
- 230000007935 neutral effect Effects 0.000 claims description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 10
- 239000000178 monomer Substances 0.000 claims description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 10
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 239000000123 paper Substances 0.000 description 42
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000945 filler Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000011122 softwood Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UZKWTJUDCOPSNM-UHFFFAOYSA-N 1-ethenoxybutane Chemical compound CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 2
- LAYAKLSFVAPMEL-UHFFFAOYSA-N 1-ethenoxydodecane Chemical compound CCCCCCCCCCCCOC=C LAYAKLSFVAPMEL-UHFFFAOYSA-N 0.000 description 2
- XXCVIFJHBFNFBO-UHFFFAOYSA-N 1-ethenoxyoctane Chemical compound CCCCCCCCOC=C XXCVIFJHBFNFBO-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- -1 alkyl vinyl ether Chemical compound 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- QJJDJWUCRAPCOL-UHFFFAOYSA-N 1-ethenoxyoctadecane Chemical compound CCCCCCCCCCCCCCCCCCOC=C QJJDJWUCRAPCOL-UHFFFAOYSA-N 0.000 description 1
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000834 fixative Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Landscapes
- Paper (AREA)
Description
本発明は良好なサイズ度を中性紙に関する。さ
らに詳しくは、硫酸バン土を含有せず、かつ、下
記一般式(1)で示される単量体と酢酸ビニルエステ
ルとの共重合物の酢酸ビニルエステル部分をケン
化して得られる水溶性を有する変性ポリビニルア
ルコール（以下ポリビニルアルコールをPVAと
略記する）を0.1〜５重量％含有することを特徴
とする良好なサイズ度を有する中性紙に関する。
CH2＝CH―Ｏ―Ｒ ……(1)
但し、Ｒは炭素数６以上のアルキル基を示す。
紙はパルプを主原料とする親水性多孔質材料で
あるが、単にパルプを抄紙したままでは実用に耐
えない。そこでサイズ剤とか填料とか各種の紙薬
品を用いてはじめて実用に耐える紙をうるのであ
る。紙の実用物性の評価項目として多くのものが
あげられるが中でもサイズ度は印刷インクのにじ
み、浸透性、筆記用インキのにじみ、さらに加工
が用原紙の場合には加工液の浸透性およびそれに
伴なう加工紙物性等を決める重要な性質である。
一般に従来使用されているサイズ性を有する紙
の多くは硫酸バン土の介在によつてロジン系サイ
ズ剤をパルプ繊維上に定着せしめることによつて
製造されるものである。しかしながら硫酸バン土
を定着剤として使用した場合には、製造工程中に
硫酸バン土の硫酸根により紙が酸性になり、カレ
ンダーロール、ドライヤーロールその他工程中に
接触する金属を腐食するばかりでなく、紙の強度
や耐久性に悪い影響をあたえることにもなり、又
或る種の印刷に対しても障害をおこすことがあ
る。又、硫酸バン土を使用して抄造した紙の実用
上の大きな問題点としては、接触した金属が極め
て錆び易いことが広く知られており、金属製品の
包装用紙、缶詰め用ダンボール、止め金を用いて
とじる印刷用紙等では発錆をおさえるために種々
の対策が必要となつている。このような事情から
硫酸バンドを添加しないで抄紙した中性紙のサイ
ズ度を高めることが社会的ニーズとして近年クロ
ーズアツプされつつある。
一方、PVAは耐油性や造膜性のすぐれた水溶
性高分子化合物であり、従来より広く紙や板紙の
表面サイジング剤として用いられてきたが、この
場合PVAを塗布した紙はステキヒトサイズ度の
ごとき物性に関してはむしろ低下するという欠点
が指摘されている。
また一方、PVAに高級アルキルビニルエーテ
ルを導入した変性PVAを紙加工に用いることは
特公昭44―16802等により知られてはいるが、こ
れを前述した如き中性紙のサイズ度の向上に利用
し得ることについてはこれまで開示された例はな
い。
本発明者らはこの様な実情にかんがみ、良好な
サイズ性を有する中性紙を得るべく鋭意検討した
結果、硫酸バン土を含有せず、かつ、下記一般式
(1)で示される単量体と酢酸ビニルエステルとの共
重合物の酢酸ビニルエステル部分をケン化して得
られる水溶性を有する変性PVAを0.1〜５重量％
含有することを特徴とする中性紙が、JIS―Ｐ―
8122によるステキヒトサイズ度が10秒以上と、極
めてサイズ度に優れており、かつ硫酸バン土を含
有していない為に強度、印刷性および耐久性にも
著しく優れ、また金属と接触して使用される形態
においても、金属になんらの発錆をもたらさない
等、優れた諸効果を奏することを見出し、本発明
を完成したものである。
CH2＝CH―Ｏ―Ｒ ……(1)
但し、Ｒは炭素数６以上のアルキル基を示す。
また本発明の中性紙は、性能面のみならず経済
性からも有利な製紙用填料である炭酸カルシウム
を含有し得るという利点をも有するものである。
即ち、すでに述べた様に一般的な製紙用サイズ剤
であるロジン系サイズ剤の多くは硫酸バン土によ
る酸性下で使用されるものであるが、填料として
前述の有利な炭酸カルシウムを用いる場合は炭酸
カルシウムが分解して発泡するという不都合を招
来する。本発明の中性紙はかかる問題をも解決す
るものであり、安価な炭酸カルシウムを填料とし
て用いることを可能ならしめることにより、経済
性に優れた中性紙を提供し得る。
本発明の中性紙に含有される変性PVAは下記
一般式(1)で示される単量体と酢酸ビニルエステル
との共重合体の酢酸ビニルエステル部分をケン化
して得られる水溶性を有する変性PVAである。
CH2＝CH―Ｏ―Ｒ ……(1)
ここで、(1)式においてＲは炭素数６以上のアル
キル基である。Ｒの炭素数が５以下であると疎水
性が小さい為か良好な性能は得られない。
本発明に用いる一般式(1)で示される単量体とし
てはオクチルビニルエーテル、ラウリルビニルエ
ーテル、ステアリルビニルエーテル等があげられ
る。一般式(1)で示される単量体はその炭素数によ
つてもことなるが、酢酸ビニルエステルに対し
0.05〜1.5モル％用いる事がのぞましい。0.05モル
％以下であると顕著な性能を発揮しない。又1.5
モル％をこえて用いると変性PVAの水溶性が低
下して好ましくない。
そして本発明の目的を損なわない範囲において
一般式(1)で示される単量体以外の他の単量体成分
の小割合を併用して用いることは何等差し支えな
い。
酢酸ビニルエステル成分は完全にケン化した方
が耐水性や強度などの諸物性の上で望ましいが一
部ケン化せずに残しておいてもよい。
変性PVAの重合度は200〜3000が望ましい。重
合度が低いと強度が低下するなど物性の上で好ま
しくない傾向にある。重合度が3000をこえて高す
ぎると水溶液粘度が高くなり、塗布工程でトラブ
ルとなるので好ましくない。
本発明において上記変性PVAは紙の要求性能
等によつても異なるが、例えば塗布等の方法によ
り、紙に対して0.1〜５重量％含有させることが
必要である。0.1重量％より少ないと顕著な性能
を発揮しない。又５重量％を越えて用いることは
原料薬品費の増大をまねくので通常の目的には望
ましくない。塗布に際しては通常は本発明の変性
PVAの単独を水溶液として使用することができ
るが、本発明の目的をそこなわない範囲内でカル
ボキシル基を含有する変性PVAや他の変性PVA
さらには未変性PVAと混合して用いることは差
し支えない。又塗布後の乾燥ロールへの付着を防
止する目的で、デンプン、ワツクスエマルジヨ
ン、各種活性剤の群より選ばれる剥離剤を併用す
ることが出来る。その他グリセリン、ジエチレン
グリコール、エチレングリコールなどの多価アル
コール類、可塑剤、カルボキシメチルセルロー
ス、デンプンおよびその誘導体、スチレン―無水
マレイン酸共重合体、スチレン―アクリル酸共重
合体などの合成系水溶性高分子、さらには炭酸カ
ルシウム、カオリナイト系クレー、ロー石クレ
ー、サチンホワイト、などの鉱物性顔料等を併用
することもできる。
本発明の中性紙を得るに用いる原紙は針葉樹パ
ルプ、広葉樹パルプ又はその混合物から得られた
ものでもよく、さらに合成繊維、人造繊維、合成
パルプ等の他の繊維を含んでいてもよい。又バー
ジンパルプのみでなく損紙、故紙等を混合してい
てもよい。更には紙力増強剤、水促進剤、消泡
剤、クレー、炭酸カルシウムのごとき填料など中
性紙の抄紙にあたつて通常使用される紙薬品類を
含有しても何らさしつかえない。
次に本発明を実施例をあげてさらに詳しく説明
するが本発明はこれらの例のみに限定されるもの
ではない。尚、例中、部とあるのは特にことわら
ないかぎり重量基準である。
実施例 １
酢酸ビニルエステルとオクチルビニルエーテル
又はラウリルビニルエーテルを用いてメタノール
溶液中で２，2′―アゾビスイソブチロニトリルを
開始剤として重合を行い共重合体を得た。これら
の共重合体をメタノールに溶解し水酸化ナトリウ
ムを触媒としてケン化後、常法により精製して変
性PVAを得た。
フリーネス590c.c.に叩解した針葉樹晒クラフト
パルプ（NBKP）を使用し、硫酸バン土を添加す
ることなく手抄抄紙機で抄紙した坪量65ｇ／m2の
原紙に上記変性PVAを1.0ｇ／m2になる様にサイ
ズプレス塗工し乾燥してから20℃、65％RHの試
験室に一夜放置したのちJIS Ｐ―8122に従いステ
キヒトサイズ度を測定した。
結果を表―１に示す。抄紙原紙のサイズ度が０
秒なのに対し本発明の中性紙はいずれも14〜10秒
と高いサイズ度を示した。
結果は表―１に示す
比較例 １
一般式(1)で示される単量体を用いた変性PVA
を使用することなく通常の未変性のPVAを塗布
すること以外はすべて実施例１と同じ条件で行な
つた紙のステキヒトサイズ度は０秒でありサイズ
度向上効果は認められなかつた。
結果は表―１に併記する。
The present invention relates to acid-free paper with good sizing. More specifically, it does not contain sodium sulfate and has water solubility obtained by saponifying the vinyl acetate portion of a copolymer of a monomer represented by the following general formula (1) and vinyl acetate. The present invention relates to an acid-free paper having good sizing properties and containing 0.1 to 5% by weight of modified polyvinyl alcohol (hereinafter polyvinyl alcohol is abbreviated as PVA). CH 2 =CH—O—R (1) However, R represents an alkyl group having 6 or more carbon atoms. Paper is a hydrophilic porous material whose main raw material is pulp, but it is not practical if it is simply made from pulp. Therefore, it is necessary to use various paper chemicals such as sizing agents and fillers to produce paper that can be used for practical purposes. There are many evaluation items for the practical physical properties of paper, including sizing, which includes bleeding of printing ink, permeability, bleeding of writing ink, and, if processing is performed on base paper, permeability of processing liquid and its accompanying effects. This is an important property that determines the physical properties of processed paper. Most of the conventionally used sized papers are produced by fixing a rosin-based sizing agent onto pulp fibers through the intervention of sulfuric acid. However, when sulfuric acid is used as a fixative, the paper becomes acidic due to the sulfate roots of sulfuric acid during the manufacturing process, which not only corrodes calender rolls, dryer rolls, and other metals that come into contact with it during the process. It can also have a negative effect on the strength and durability of the paper, and can also cause problems with certain types of printing. In addition, it is widely known that a major practical problem with paper made using banal sulfate soil is that metals that come into contact with it are extremely susceptible to rust. Various measures are required to prevent rust from forming on printing paper that is used for binding. Under these circumstances, increasing the size of acid-free paper made without adding sulfuric acid has recently come to the fore as a social need. On the other hand, PVA is a water-soluble polymer compound with excellent oil resistance and film-forming properties, and has been widely used as a surface sizing agent for paper and paperboard. It has been pointed out that the physical properties such as these are rather deteriorated. On the other hand, although it is known from Japanese Patent Publication No. 44-16802 that modified PVA in which higher alkyl vinyl ether is introduced into PVA is used for paper processing, it is not possible to use this to improve the size of neutral paper as mentioned above. No example has been disclosed so far of obtaining the same. In view of these circumstances, the inventors of the present invention have conducted intensive studies to obtain neutral paper with good size properties.
0.1 to 5% by weight of water-soluble modified PVA obtained by saponifying the vinyl acetate part of the copolymer of the monomer shown in (1) and vinyl acetate.
Acid-free paper characterized by containing JIS-P-
8122 has an extremely high sizing degree of 10 seconds or more, and since it does not contain sulfuric acid, it has excellent strength, printability, and durability, and can be used in contact with metal. The inventors have completed the present invention by discovering that even in the form of the metal, excellent effects such as not causing any rusting to the metal can be achieved. CH 2 =CH—O—R (1) However, R represents an alkyl group having 6 or more carbon atoms. Furthermore, the neutral paper of the present invention has the advantage that it can contain calcium carbonate, which is a filler for paper manufacturing that is advantageous not only in terms of performance but also in terms of economy.
That is, as mentioned above, most of the rosin-based sizing agents, which are common paper-making sizing agents, are used under acidic conditions with silica sulfate, but when using the aforementioned advantageous calcium carbonate as a filler, This causes the inconvenience that calcium carbonate decomposes and foams. The neutral paper of the present invention also solves this problem, and by making it possible to use inexpensive calcium carbonate as a filler, it is possible to provide a neutral paper with excellent economic efficiency. The modified PVA contained in the neutral paper of the present invention is a water-soluble modified PVA obtained by saponifying the vinyl acetate portion of a copolymer of a monomer represented by the following general formula (1) and vinyl acetate. It is PVA. CH 2 =CH—O—R (1) Here, in formula (1), R is an alkyl group having 6 or more carbon atoms. If the number of carbon atoms in R is 5 or less, good performance cannot be obtained, probably because hydrophobicity is small. Examples of the monomer represented by the general formula (1) used in the present invention include octyl vinyl ether, lauryl vinyl ether, and stearyl vinyl ether. The monomer represented by general formula (1) differs depending on the number of carbon atoms, but for vinyl acetate,
It is preferable to use 0.05 to 1.5 mol%. If it is less than 0.05 mol%, no remarkable performance will be exhibited. Also 1.5
If it is used in excess of mol%, the water solubility of the modified PVA will decrease, which is not preferable. There is no problem in using a small proportion of other monomer components other than the monomer represented by general formula (1) in combination as long as the object of the present invention is not impaired. Although it is desirable to completely saponify the vinyl acetate component in terms of physical properties such as water resistance and strength, a portion of the vinyl acetate component may be left unsaponified. The degree of polymerization of modified PVA is preferably 200 to 3000. A low degree of polymerization tends to be unfavorable in terms of physical properties, such as a decrease in strength. If the degree of polymerization is too high, exceeding 3000, the viscosity of the aqueous solution will increase, causing trouble in the coating process, which is not preferable. In the present invention, the modified PVA needs to be contained in an amount of 0.1 to 5% by weight based on the paper, for example, by a method such as coating, although this varies depending on the required performance of the paper. If it is less than 0.1% by weight, no remarkable performance will be exhibited. Moreover, using more than 5% by weight is not desirable for general purposes because it increases the cost of raw materials and chemicals. During application, the modification of the present invention is usually applied.
Although PVA alone can be used as an aqueous solution, modified PVA containing a carboxyl group or other modified PVA can be used as long as the purpose of the present invention is not impaired.
Furthermore, it may be used in combination with unmodified PVA. Further, for the purpose of preventing adhesion to the drying roll after coating, a release agent selected from the group of starch, wax emulsion, and various activators can be used in combination. Other polyhydric alcohols such as glycerin, diethylene glycol, and ethylene glycol, plasticizers, carboxymethyl cellulose, starch and its derivatives, synthetic water-soluble polymers such as styrene-maleic anhydride copolymers, styrene-acrylic acid copolymers, Furthermore, mineral pigments such as calcium carbonate, kaolinite clay, loite clay, and satin white can also be used in combination. The base paper used to obtain the neutral paper of the present invention may be obtained from softwood pulp, hardwood pulp, or a mixture thereof, and may further contain other fibers such as synthetic fibers, man-made fibers, and synthetic pulp. Moreover, not only virgin pulp but also broken paper, waste paper, etc. may be mixed. Furthermore, there is no problem in containing paper chemicals commonly used in the production of neutral paper, such as paper strength enhancers, water accelerators, antifoaming agents, clays, fillers such as calcium carbonate, etc. Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples. In the examples, parts are by weight unless otherwise specified. Example 1 A copolymer was obtained by polymerizing vinyl acetate and octyl vinyl ether or lauryl vinyl ether in a methanol solution using 2,2'-azobisisobutyronitrile as an initiator. These copolymers were dissolved in methanol, saponified using sodium hydroxide as a catalyst, and purified by a conventional method to obtain modified PVA. Using 590 c.c. freeness beaten softwood bleached kraft pulp (NBKP), 1.0 g/m2 of the above modified PVA was added to base paper with a basis weight of 65 g/m 2 which was made using a hand paper machine without adding bansulfate. The sample was coated with a size press to a size of m2 , dried, and left in a test room at 20°C and 65% RH overnight, and the Steckigt sizing degree was measured according to JIS P-8122. The results are shown in Table-1. The size degree of the paper base paper is 0
The neutral paper of the present invention all showed a high sizing degree of 14 to 10 seconds. The results are shown in Table 1 Comparative Example 1 Modified PVA using the monomer represented by general formula (1)
The Steckigt sizing rate of the paper, which was carried out under the same conditions as in Example 1 except that ordinary unmodified PVA was applied without using PVA, was 0 seconds, and no sizing effect was observed. The results are also listed in Table-1.
【表】
比較例 ２
一般式(1)の単量体として炭素数３のアルキル基
を有するブチルビニルエーテルと酢酸ビニルエス
テルを用いる以外は実施例１と同様にして変性
PVAを塗布した紙は表―２に示すごとくサイズ
度は０〜１秒でありサイズ効果はみとめられなか
つた。[Table] Comparative Example 2 Modified in the same manner as in Example 1 except that butyl vinyl ether and vinyl acetate having an alkyl group having 3 carbon atoms were used as the monomers of general formula (1).
As shown in Table 2, the paper coated with PVA had a sizing degree of 0 to 1 second, and no size effect was observed.
【表】
実施例 ２
針葉樹晒クラフトパルプ（NBKP）と広葉樹晒
クラフトパルプ（LBKP）の３：１の混合パルプ
を用い炭酸カルシウムを10％含有せしめた坪量64
ｇ／m2の原紙に実施例１で得た変性PVAを1.5
ｇ／m2となる様にサイズプレス塗工し乾燥し、20
℃、65％RHの試験室に一夜放置したのちJIS Ｐ
―8122に従いステキヒトサイズ度を測定した。結
果を表―３に示す。原紙のサイズ度が０秒なのに
対し本発明の中性紙は12〜16秒と高いサイズ度を
示した。[Table] Example 2 Basis weight 64 containing 10% calcium carbonate using a 3:1 mixed pulp of softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP)
1.5 g/m 2 of the modified PVA obtained in Example 1 was added to the base paper.
Size press coating to give g/m 2 , drying, 20
JIS P after being left overnight in a test room at ℃ and 65% RH.
-8122, Steckicht size was measured. The results are shown in Table-3. While the sizing degree of the base paper was 0 seconds, the neutral paper of the present invention showed a high sizing degree of 12 to 16 seconds.
【表】【table】
Claims (1)
で示される単量体と酢酸ビニルエステルとの共重
合物の酢酸ビニルエステル部分をケン化して得ら
れる水溶性を有する変性ポリビニルアルコールを
0.1〜５重量％含有することを特徴とする良好な
サイズ度を有する中性紙。 CH2＝CH―Ｏ―Ｒ ……(1) 但し、Ｒは炭素数６以上のアルキル基を示す。[Scope of Claims] 1. Does not contain sodium sulfate and has the following general formula (1)
Water-soluble modified polyvinyl alcohol obtained by saponifying the vinyl acetate part of a copolymer of the monomer represented by and vinyl acetate.
Neutral paper with good sizing, characterized by containing 0.1 to 5% by weight. CH 2 =CH—O—R (1) However, R represents an alkyl group having 6 or more carbon atoms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17373979A JPS5696995A (en) | 1979-12-27 | 1979-12-27 | Sizing of neutral paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17373979A JPS5696995A (en) | 1979-12-27 | 1979-12-27 | Sizing of neutral paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5696995A JPS5696995A (en) | 1981-08-05 |
| JPS6242080B2 true JPS6242080B2 (en) | 1987-09-07 |
Family
ID=15966223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17373979A Granted JPS5696995A (en) | 1979-12-27 | 1979-12-27 | Sizing of neutral paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5696995A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4956051A (en) * | 1985-10-08 | 1990-09-11 | Betz Paperchem, Inc. | Detackification of adhesive materials contained in secondary fiber using polyvinyl alcohol |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5482417A (en) * | 1977-12-09 | 1979-06-30 | Nippon Synthetic Chem Ind | Paper treating method |
-
1979
- 1979-12-27 JP JP17373979A patent/JPS5696995A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5482417A (en) * | 1977-12-09 | 1979-06-30 | Nippon Synthetic Chem Ind | Paper treating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5696995A (en) | 1981-08-05 |
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