JP3722402B2 - Water dispersible hot melt composition, moisture-proof paper using the same, and method for producing the same - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、水分散性ホットメルト組成物及び該組成物を用いる、離解可能で防湿性に優れた防湿紙並びにその製造方法に関するものである。
【０００２】
【従来の技術】
一般に防湿紙とは、紙にポリエチレン、ポリプロピレンなどのオレフィン系樹脂を塗工したものが良く知られており、広く使用されている。このオレフィン系樹脂を塗工した防湿紙は、防湿性に優れ、加工性が良いばかりでなく、安価であり、防湿紙として非常に優れている。
しかし、その反面、リサイクル性、即ち故紙再生という観点からみると、防湿層の被膜強度が強すぎるため、紙を再生しパルプ化する工程で使用されるパルパーでは、紙の繊維部から脱離したオレフィン系樹脂層が細かく分散されずに塊やフィルムとして残り、これらが抄紙機の乾燥ロールに付着したり、また再生された紙の表面に付着し、にじみや凹凸が発生して故紙のリサイクルを不可能にしている。
【０００３】
また近年、リサイクル可能な防湿紙が求められるなかで、合成ゴムラテックスとワックスエマルジョンとからなるエマルジョンを塗工した防湿紙が提案されている。この防湿紙は防湿性に優れ、かつ故紙へのリサイクル性も有している。
しかしながら、塗工液がエマルジョンであるため、被膜形成するのに長大な乾燥設備が必要で、かつオレフィン系樹脂の塗工に比べ生産性が悪い。また、乾燥が進み、防湿層の被膜形成にともなって、防湿紙にカールが発生したり、塗工液中のワックスがブリードしたり、また防湿紙に滑りが発生する。従って、エマルジョン塗工タイプの防湿紙の裏面には、カール防止や滑り防止の目的で防滑剤などを塗工せざるをえず、工程数が増加するという問題がある。また、これらの防湿液は、いずれも現状では非常に高価なため、特殊用途のみに使用され一般の防湿紙用にはほとんど使用されていないのが実情である。
【０００４】
【発明が解決しようとする課題】
本発明は上記の如き従来の欠点を解決し、防湿性に優れ、故紙へのリサイクル性があり、安価で生産性に優れた防湿紙を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明者らは上記課題を解決するべく鋭意検討した結果、特定の成分を特定の割合で配合したホットメルト組成物を紙基材に塗工することにより、上記目的を満足する防湿紙が提供できることを見出した。
即ち、本発明の第１は、下記の成分（Ａ）〜（Ｅ）〔（Ａ）、（Ｂ）、（Ｃ）、（Ｄ）、（Ｅ）の合計で１００重量部〕からなることを特徴とする水分散性ホットメルト組成物：
（Ａ）プロピレンを単独重合あるいはプロピレンとエチレン又はブテン−１を共重合した分子量１０００〜１０００００のアモルファスポリアルファオレフィン４０〜５５重量部、
（Ｂ）粘着付与剤１０〜２５重量部、
（Ｃ）ワックス２０〜３５重量部、
（Ｄ）ポリプロピレンオリゴマー２〜１０重量部、
（Ｅ）相溶化剤１〜７重量部、
本発明の第２は、紙基材と上記のホットメルト組成物からなる、離解可能で防湿性に優れた防湿紙、
本発明の第３は、上記のホットメルト組成物を紙基材に塗工することを特徴とする、離解可能で防湿性に優れた防湿紙の製造方法をそれぞれ内容とする。
【０００６】
本発明に使用される（Ａ）アモルファスポリアルファオレフィンは、プロピレン単独あるいはプロピレンとエチレンやブテン−１等を共重合した非晶性のオレフィン系ポリマーである。これらの分子量は１０００〜１０００００程度のものが適当である。分子量が１０００未満では防湿層に十分な被膜強度がなく、さらに再生紙化の乾燥工程において樹脂のにじみが発生する場合がある。また１０００００を越えると樹脂の流動性が悪く、均一な防湿層が形成できないため、良好な防湿性が得られない場合がある。また、これらは単独又は２種以上を混合して使用される。
アモルファスポリアルファオレフィンの使用量は４０〜５５重量部である。４０重量部未満では価格メリットが少なくなり、５５重量部を越えると防湿性、離解性等が悪くなる。
【０００７】
本発明に使用される（Ｂ）粘着付与剤には、官能基を有するものとして、ロジン、変性ロジン、及びこれらのエステル化合物、アルキルフェノール樹脂、ロジン及びアルキルフェノール変性キシレン樹脂、テルペンフェノール樹脂などがあり、また官能基を有しないものとして、テルペン系樹脂、オレフィン系樹脂、スチレン系樹脂、芳香族系石油樹脂、クマロンインデン樹脂などがあり、これらのいずれを選択してもよく、また単独又は２種以上を混合して使用される。
粘着付与剤の使用量は１０〜２５重量部である。１０重量部未満では防湿性が不十分となり、２５重量部を越えると十字折り時に防湿層にクラックが生じ、防湿性能が低下する。
【０００８】
本発明に使用される（Ｃ）ワックスには、大別すると天然系ワックスと合成系ワックスの２種類があり、これらのいずれのワックスを選択してもよく、また単独又は２種以上を混合して使用される。
天然系ワックスには、パラフィンワックス、マイクロクリスタリンワックス、モンタンワックス、カルナバワックス、キャンデリラワックスなどがあり、また合成系ワックスには、低分子量ポリエチレンワックス、低分子量ポリプロピレンワックスなどがある。
ワックスの使用量は２０〜３５重量部である。２０重量部未満では防湿性が不十分となり、３５重量部を越えると離解後の抄紙時ににじみが発生する。
【０００９】
本発明に使用される（Ｄ）ポリプロピレンオリゴマーは、分子量１万〜５万までの範囲のものが好適に使用される。分子量が１万未満では離解後の抄紙時における耐熱性が不十分となり、５万を越えると溶融混合が難しくなる 。
ポリプロピレンオリゴマーの使用量は２〜１０重量部である。２重量部未満では上記した耐熱性が不十分となり、１０重量部を越えると十字折り時に防湿層にクラックが生じ易くなり、防湿性能が低下する。
【００１０】
本発明に使用される（Ｅ）相溶化剤は、無水マレイン酸等の酸成分をグラフトした低分子量ポリプロピレンなどがあり、分子量１万〜５万の範囲のものが好適に使用される。分子量が１万未満では上記した耐熱性が不十分となり、５万を越えると相溶化の効果が低下する。
相溶化剤の使用量は１〜７重量部である。１重量部未満では防湿性向上効果が不十分であり、７重量部を越えるとホットメルト組成物の熱安定性が悪くなる。
【００１１】
本発明において、各成分の使用量は、成分（Ａ）〜（Ｅ）の合計で１００重量部である。
本発明によるホットメルト組成物には、更に酸化防止剤、２次酸化防止剤などの安定剤や添加剤を配合してもさしつかえない。
本発明によるホットメルト組成物は、（Ａ）アモルファスポリアルファオレフィンを主成分として、防湿性向上のための（Ｂ）粘着付与剤及び（Ｃ）ワックスと、離解後の抄紙時の耐熱性向上のための（Ｄ）ポリプロピレンオリゴマー及び（Ｅ）相溶化剤を配合してなるため、配合量が上記範囲を越えると、上記したように、防湿性が不十分であったり、離解性が不十分であったり、離解後の抄紙時ににじみが発生したりする。
【００１２】
紙基材に対する塗工方法は、ロールコーター、スロットオリフィスコーター、エクストルージョンコーターなどの使用が可能であるが、これらに限定されず、いかなる方法を用いてもよい。
【００１３】
【実施例】
以下に本発明を実施例を挙げて更に詳細に説明するが、本発明はこれらのみに限定されるものではない。
尚、以下の記載において、％は特に断らない限り、重量％を示す。
【００１４】
実施例１
（Ａ）成分としてアモルファスポリアルファオレフィン（ポリプロピレン単独重合体、分子量７００００、ＡＰＡＯ）４７％、（Ｂ）成分として芳香族変性テルペン炭化水素樹脂（Ｃ９系芳香族）（軟化点１２５℃、酸価１以下、分子量８００）１５％、（Ｃ）成分としてポリプロピレンワックス（Ｃ１）（軟化点１５４℃、針入度１以下、分子量７０００）１５％、低分子量ポリエチレンワックス（Ｃ２）（融点１１０℃、分子量７５０）１５％、（Ｄ）成分としてポリプロピレンオリゴマー〔ＭＦＲ（２３０℃）＝３０ｇ／１０分、融点１５７℃、分子量４００００〕５％、（Ｅ）成分として無水マレイン酸変性低分子量ポリプロピレン（分子量４００００、軟化点１５４℃、酸価２６）３％、及び安定剤としてヒンダードフェノール系酸化防止剤（融点１１０〜１２５℃）２％からなる組成物を１８０〜１９０℃に加熱し、材料の全てが溶解したところで各成分が均一に分散する様に十分攪拌し、ホットメルト組成物を作成した。
【００１５】
得られた溶融状態のホットメルト組成物を予め加熱しておいたマイヤーバーを使って７５ｇ／m2のクラフト紙上に２０ｇ／m2塗工して防湿紙を得た。
【００１６】
得られた防湿紙について、透湿度、水による離解性及び摩擦係数を以下に示した方法で測定した。結果は表１に示したように、平板状及び十字折りでの透湿度がオレフィン系樹脂を塗工した防湿紙と同等又はそれ以上の良好な防湿性を示した。また、水による離解性が良好で、抄紙した紙の加熱によるにじみ出しもほとんど見られなかった。さらに、摩擦係数も高く、エマルジョン塗工タイプの防湿紙のような防滑剤塗工の必要が無いことが判る。
【００１７】
（１）透湿度
カップ法（ＪＩＳ Ｚ ０２０８）に基づいて透湿度を測定する。透湿度は平板状と十字折りについて測定する。
尚、十字折りは、サンプルの中央を十文字に折り、折り目上を３Kgのローラーで１往復させ折り目をつけた後、透湿度を測定する。
【００１８】
（２）離解性
熊谷理機工業株式会社製標準パルプ離解機を用い、１〜１．５cm角に切断した防湿紙サンプルを２Ｌの水に対して４０ｇ（パルプ濃度２％）投入して３０分間攪拌後、パルプ溶液及び抄紙したものの樹脂分散性を下記の基準で目視により判定する。
○：抄紙された紙に、樹脂の存在がほとんど確認できない。
×：抄紙された紙に、細かく分散されていない樹脂が若干付着・存在する。
【００１９】
また、にじみ出しの評価については、抄紙した紙をギヤオーブン内で１５０℃、１分間加熱してにじみの有無を下記の基準で目視により判定する。
○：にじみ出しがほとんど見られない。
△：にじみ出しが若干見られ、にじみの面積が１０％未満である。
×：にじみ出しが相当見られ、にじみの面積が１０〜３０％である。
【００２０】
（３）摩擦係数（ＪＩＳ Ｐ ８１４７水平法）
水平板の上に、クラフト紙からなる試験片をシワや弛みが生じないように粘着テープで固定する。一方、防湿紙からなる試験片をおもりに密着させて、滑り面（表面）にシワや弛みが生じないように両端を粘着テープでおもりの前後側面に張り付けて錘り用試験片とし、引張試験機でクラフト紙からなる試験片の上を引張速度３０mm／min で約１０mm錘り用試験片を滑らせ、両者間の摩擦力を記録させる。
比較例１
（Ａ）成分としてアモルファスポリアルファオレフィン５０％、（Ｂ）成分として芳香族変性テルペン炭化水素樹脂１５％、（Ｃ）成分としてポリプロピレンワックス（Ｃ１）１５％、低分子量ポリエチレンワックス（Ｃ２）１５％、（Ｄ）成分としてポリプロピレンオリゴマー５％、及び安定剤としてヒンダードフェノール系酸化防止剤２％を用いた他は実施例１と同様の方法でホットメルト組成物及び防湿紙を作成し、透湿度、離解性及び摩擦係数を測定した。
結果は表１に示したように、水による離解性が良好で、かつにじみ出しもほとんど見られなかったが、平板状及び十字折りでの透湿度が実施例１の場合よりも大きく、防湿性が低下した。
【００２２】
比較例２
（Ａ）成分としてアモルファスポリアルファオレフィン５２％、（Ｂ）成分として芳香族変性テルペン炭化水素樹脂１５％、（Ｃ）成分としてポリプロピレンワックス（Ｃ１）１５％、低分子量ポリエチレンワックス（Ｃ２）１５％、（Ｅ）成分として酸変性低分子量ポリプロピレン３％、及び安定剤としてヒンダードフェノール系酸化防止剤２％を用いた他は実施例１と同様の方法でホットメルト組成物及び防湿紙を作成し、透湿度、離解性及び摩擦係数を測定した。
結果は表１に示したように、平板状及び十字折りでの透湿度は実施例１の場合と比較してほとんど変わらず、防湿性の低下はほとんど見られないが、水による離解性が若干悪くなり、にじみ出しも若干見られた。
【００２３】
比較例３
（Ａ）成分としてアモルファスポリアルファオレフィン５２％、（Ｂ）成分として芳香族変性テルペン炭化水素樹脂１６％、（Ｃ）成分としてポリプロピレンワックス（Ｃ１）１６％、低分子量ポリエチレンワックス（Ｃ２）１６％、及び安定剤としてヒンダードフェノール系酸化防止剤２％を用いた他は実施例１と同様の方法でホットメルト組成物及び防湿紙を作成し、透湿度、離解性及び摩擦係数を測定した。
結果は表１に示したように、平板状及び十字折りでの透湿度は実施例１の場合よりも相当大きくなり、防湿性の低下が見られ、また水による離解性も若干悪くなり、かつにじみ出しが増加した。
【００２４】
比較例４
アクリル酸エステル−スチレン共重合体及びワックスを乳化したエマルジョン（サイデン製商品名サイビノール）を塗工（固形分２０ｇ／m2）したリサイクル可能な防湿紙について、透湿度、離解性及び摩擦係数を測定した。
結果は表１に示したように、本発明のホットメルト組成物を塗工した防湿紙と比較して、透湿度が大きく、防湿性が低く、また静摩擦係数及び動摩擦係数がともに低く、滑りやすい傾向にあった。
【００２５】
【表１】
【発明の効果】
叙上の通り、本発明のホットメルト組成物を塗工した防湿紙は、オレフィン系樹脂を塗工した防湿紙と同等又はそれ以上の防湿性があり、かつ折り曲げ等による防湿性の低下がない。
さらに近年提案されているエマルジョン塗工タイプのリサイクル可能な防湿紙と同等の水に対する離解性及び分散性を有し、抄紙後の加熱によるにじみも無く、摩擦係数も高く、防滑剤塗工の必要が無く、かつ乾燥工程を必要としないのでカールの心配がなく、また設備的にも安価であり、作業能率も良好である。
また価格的にも、安価なアモルファスポリアルファオレフィンを主成分とするので、リサイクル可能な防湿紙を安価に提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-dispersible hot melt composition, a moisture-proof paper using the composition and having excellent moisture resistance and a method for producing the moisture-proof paper.
[0002]
[Prior art]
In general, the moisture-proof paper is well known and widely used, which is obtained by coating paper with an olefin resin such as polyethylene or polypropylene. The moisture-proof paper coated with this olefin resin is not only excellent in moisture-proof property and processability, but also is inexpensive and very excellent as moisture-proof paper.
However, on the other hand, from the viewpoint of recyclability, that is, the recycling of the old paper, the coating strength of the moisture-proof layer is too strong, so the pulper used in the process of regenerating and pulping the paper is detached from the fiber portion of the paper. The olefin-based resin layer remains as a lump or film without being finely dispersed, and adheres to the drying roll of the paper machine or adheres to the surface of the recycled paper, causing bleeding and unevenness to be recycled. Making it impossible.
[0003]
In recent years, moisture-proof paper coated with an emulsion composed of a synthetic rubber latex and a wax emulsion has been proposed amidst demands for recyclable moisture-proof paper. This moisture-proof paper is excellent in moisture-proof property and has recyclability to waste paper.
However, since the coating solution is an emulsion, a long drying facility is required to form a film, and productivity is poor compared to coating of an olefin resin. Further, as the drying progresses and the moisture-proof layer is formed, the moisture-proof paper curls, the wax in the coating solution bleeds, or the moisture-proof paper slips. Therefore, there is a problem that the number of processes increases because the back surface of the emulsion-coated type moisture-proof paper must be coated with an anti-slip agent for the purpose of preventing curling and slipping. In addition, since all of these moisture-proof liquids are very expensive at present, they are used only for special purposes and are hardly used for general moisture-proof paper.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a moisture-proof paper which is excellent in moisture resistance, recyclable to waste paper, inexpensive and excellent in productivity.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors provide a moisture-proof paper satisfying the above-mentioned purpose by coating a hot-melt composition containing a specific component at a specific ratio on a paper substrate. I found out that I can do it.
That is, the first of the present invention comprises the following components (A) to (E) [100 parts by weight in total of (A), (B), (C), (D), (E)]. Water dispersible hot melt compositions characterized:
(A) 40 to 55 parts by weight of an amorphous polyalphaolefin having a molecular weight of 1,000 to 100,000 obtained by homopolymerizing propylene or copolymerizing propylene and ethylene or butene-1 ,
(B) 10 to 25 parts by weight of a tackifier,
(C) 20 to 35 parts by weight of wax,
(D) 2 to 10 parts by weight of a polypropylene oligomer,
(E) 1 to 7 parts by weight of a compatibilizer,
The second aspect of the present invention is a moisture-proof paper comprising a paper base material and the above hot melt composition, which is disaggregable and excellent in moisture-proof property,
A third aspect of the present invention includes a method for producing a moisture-proof paper that is disaggregated and excellent in moisture-proof property, characterized in that the hot-melt composition is applied to a paper substrate.
[0006]
The amorphous polyalphaolefin (A) used in the present invention is an amorphous olefin polymer obtained by copolymerizing propylene alone or propylene with ethylene, butene-1, or the like. A molecular weight of about 1000 to 100,000 is appropriate. If the molecular weight is less than 1000, the moisture-proof layer does not have sufficient coating strength, and resin bleeding may occur in the drying process of recycled paper. On the other hand, if it exceeds 100,000, the flowability of the resin is poor and a uniform moisture-proof layer cannot be formed, so that good moisture-proof properties may not be obtained. Moreover, these are used individually or in mixture of 2 or more types.
The amount of amorphous polyalphaolefin used is 40 to 55 parts by weight. If it is less than 40 parts by weight, the price merit is reduced, and if it exceeds 55 parts by weight, moisture resistance, disaggregation and the like deteriorate.
[0007]
The (B) tackifier used in the present invention includes a rosin, a modified rosin, and an ester compound thereof, an alkylphenol resin, a rosin and an alkylphenol-modified xylene resin, a terpenephenol resin, and the like as those having a functional group. In addition, those having no functional group include terpene resins, olefin resins, styrene resins, aromatic petroleum resins, coumarone indene resins, and any of these may be selected, alone or in combination A mixture of the above is used.
The usage-amount of a tackifier is 10-25 weight part. If the amount is less than 10 parts by weight, the moisture-proof property becomes insufficient. If the amount exceeds 25 parts by weight, the moisture-proof layer is cracked at the time of cross-folding, and the moisture-proof performance is lowered.
[0008]
The (C) wax used in the present invention is roughly classified into two types, natural waxes and synthetic waxes, and any of these waxes may be selected, or a single type or a mixture of two or more types may be selected. Used.
Examples of natural waxes include paraffin wax, microcrystalline wax, montan wax, carnauba wax, and candelilla wax. Synthetic waxes include low molecular weight polyethylene wax and low molecular weight polypropylene wax.
The amount of wax used is 20 to 35 parts by weight. If it is less than 20 parts by weight, the moisture-proof property is insufficient, and if it exceeds 35 parts by weight, bleeding occurs during papermaking after disaggregation.
[0009]
As the (D) polypropylene oligomer used in the present invention, those having a molecular weight in the range of 10,000 to 50,000 are preferably used. If the molecular weight is less than 10,000, the heat resistance at the time of papermaking after disaggregation is insufficient, and if it exceeds 50,000, melt mixing becomes difficult.
The usage-amount of a polypropylene oligomer is 2-10 weight part. If the amount is less than 2 parts by weight, the above-described heat resistance is insufficient, and if it exceeds 10 parts by weight, the moisture-proof layer is likely to be cracked at the time of cross-folding, and the moisture-proof performance is deteriorated.
[0010]
Examples of the (E) compatibilizing agent used in the present invention include low molecular weight polypropylene grafted with an acid component such as maleic anhydride, and those having a molecular weight in the range of 10,000 to 50,000 are preferably used. If the molecular weight is less than 10,000, the heat resistance described above is insufficient, and if it exceeds 50,000, the effect of compatibilization is reduced.
The usage-amount of a compatibilizing agent is 1-7 weight part. If it is less than 1 part by weight, the effect of improving moisture resistance is insufficient, and if it exceeds 7 parts by weight, the thermal stability of the hot melt composition is deteriorated.
[0011]
In this invention, the usage-amount of each component is 100 weight part in total of component (A)-(E).
The hot melt composition according to the present invention may further contain stabilizers and additives such as antioxidants and secondary antioxidants.
The hot melt composition according to the present invention comprises (A) an amorphous polyalphaolefin as a main component, (B) a tackifier for improving moisture resistance and (C) a wax, and an improvement in heat resistance during papermaking after disaggregation. Therefore, when the blending amount exceeds the above range, as described above, the moisture resistance is insufficient or the disaggregation property is insufficient. Or bleeding may occur during papermaking after disaggregation.
[0012]
As a coating method for the paper substrate, a roll coater, a slot orifice coater, an extrusion coater, or the like can be used, but the method is not limited to these, and any method may be used.
[0013]
【Example】
Examples The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
In the following description, “%” means “% by weight” unless otherwise specified.
[0014]
Example 1
Amorphous polyalphaolefin (polypropylene homopolymer, molecular weight 70000, APAO) 47% as component (A), aromatic modified terpene hydrocarbon resin (C9 aromatic) as component (B) (softening point 125 ° C., acid value 1 In the following, molecular weight 800) 15%, as component (C) polypropylene wax (C1) (softening point 154 ° C., penetration 1 or less, molecular weight 7000) 15%, low molecular weight polyethylene wax (C2) (melting point 110 ° C., molecular weight 750) ) 15%, Polypropylene oligomer as component (D) [MFR (230 ° C.) = 30 g / 10 min, melting point 157 ° C., molecular weight 40000] 5%, Maleic anhydride modified low molecular weight polypropylene (molecular weight 40000, softening) as component (E) Point 154 ° C, acid value 26) 3%, and hindered phenol as stabilizer A composition comprising 2% of an anti-oxidation agent (melting point: 110 to 125 ° C.) is heated to 180 to 190 ° C. and stirred sufficiently so that each component is uniformly dispersed when all of the materials are dissolved. Created.
[0015]
The obtained hot melt composition in a molten state was coated with 20 g / m 2 on 75 g / m 2 kraft paper using a pre-heated Meyer bar to obtain moisture-proof paper.
[0016]
About the obtained moisture-proof paper, moisture permeability, disaggregation by water, and friction coefficient were measured by the methods shown below. As shown in Table 1, the results showed that the moisture permeability in the flat plate shape and the cross fold was equal to or better than the moisture-proof paper coated with the olefin resin. Moreover, the disaggregation property with water was good, and there was almost no bleeding due to heating of the paper. Further, the coefficient of friction is high, and it can be seen that there is no need for anti-slip agent coating as in emulsion coating type moisture-proof paper.
[0017]
(1) The moisture permeability is measured based on the moisture permeability cup method (JIS Z 0208). The moisture permeability is measured for flat plate and cross fold.
In the cross-folding, the center of the sample is folded into a cross, the crease is reciprocated once with a 3 kg roller, and the moisture permeability is measured.
[0018]
(2) Disintegration property Using a standard pulp disaggregator manufactured by Kumagai Riki Kogyo Co., Ltd., 40 g (pulp concentration 2%) of a moisture-proof paper sample cut into 1 to 1.5 cm square is added to 2 L of water for 30 minutes. After stirring, the resin dispersibility of the pulp solution and the papermaking is visually determined according to the following criteria.
○: The presence of resin is hardly confirmed in the paper that has been made.
X: Resin that is not finely dispersed is slightly adhered and present on the paper that has been made.
[0019]
For evaluation of bleeding, the paper thus produced is heated in a gear oven at 150 ° C. for 1 minute, and the presence or absence of bleeding is visually determined according to the following criteria.
○: Almost no bleeding is observed.
Δ: Slight oozing is observed, and the bleed area is less than 10%.
X: Appreciable bleeding is observed, and the area of bleeding is 10 to 30%.
[0020]
(3) Friction coefficient (JIS P 8147 horizontal method)
A test piece made of kraft paper is fixed on a horizontal plate with an adhesive tape so as not to cause wrinkles or slack. On the other hand, a test piece made of moisture-proof paper is brought into close contact with the weight, and both ends are attached to the front and back sides of the weight with adhesive tape to prevent wrinkles or slack on the sliding surface (surface), and used as a weight test piece. A test piece for weighing about 10 mm is slid on a test piece made of kraft paper at a tensile speed of 30 mm / min with a machine, and the friction force between the two is recorded.
Comparative Example 1
Amorphous polyalphaolefin 50% as component (A), 15% aromatic modified terpene hydrocarbon resin as component (B), 15% polypropylene wax (C1) as component (C), 15% low molecular weight polyethylene wax (C2), (D) A hot melt composition and moisture-proof paper were prepared in the same manner as in Example 1 except that 5% of the polypropylene oligomer was used as the component and 2% of the hindered phenolic antioxidant was used as the stabilizer. Disaggregation and coefficient of friction were measured.
As shown in Table 1, the results showed good disaggregation with water and almost no oozing, but the moisture permeability in the flat plate shape and the cross fold was larger than in the case of Example 1, and the moisture proof property. Decreased.
[0022]
Comparative Example 2
(A) component is amorphous polyalphaolefin 52%, (B) component is aromatic modified terpene hydrocarbon resin 15%, component (C) is polypropylene wax (C1) 15%, low molecular weight polyethylene wax (C2) 15%, (E) A hot melt composition and moisture-proof paper were prepared in the same manner as in Example 1 except that 3% acid-modified low molecular weight polypropylene was used as the component and 2% hindered phenolic antioxidant was used as the stabilizer. Moisture permeability, disaggregation and coefficient of friction were measured.
As shown in Table 1, the moisture permeability in the flat plate shape and the cross fold is almost the same as that in Example 1, and the deterioration of moisture resistance is hardly seen, but the disaggregation property by water is a little. It got worse and some bleeding was seen.
[0023]
Comparative Example 3
Amorphous polyalphaolefin 52% as component (A), aromatic modified terpene hydrocarbon resin 16% as component (B), polypropylene wax (C1) 16% as component (C), low molecular weight polyethylene wax (C2) 16%, A hot melt composition and moisture-proof paper were prepared in the same manner as in Example 1 except that 2% of a hindered phenolic antioxidant was used as a stabilizer, and moisture permeability, disaggregation and friction coefficient were measured.
As shown in Table 1, the moisture permeability in the flat plate shape and the cross fold is considerably larger than that in Example 1, a decrease in moisture resistance is seen, and the disaggregation by water is slightly deteriorated, and Bleeding increased.
[0024]
Comparative Example 4
Measures moisture permeability, disaggregation and coefficient of friction for recyclable moisture-proof paper coated with an emulsion of acrylate-styrene copolymer and wax (product name: Cybinol, manufactured by Syden) (solid content 20 g / m 2 ). did.
As shown in Table 1, the results are higher than the moisture-proof paper coated with the hot melt composition of the present invention, the moisture permeability is large, the moisture-proof property is low, and both the static friction coefficient and the dynamic friction coefficient are both low and slippery. There was a trend.
[0025]
[Table 1]
【The invention's effect】
As described above, the moisture-proof paper coated with the hot melt composition of the present invention has a moisture-proof property equal to or higher than that of the moisture-proof paper coated with an olefin resin, and does not deteriorate moisture resistance due to bending or the like. .
Furthermore, it has the same disintegration and dispersibility in water as the emulsion coating type recyclable moisture-proof paper proposed in recent years, has no bleeding due to heating after papermaking, has a high friction coefficient, and requires anti-slip coating. In addition, since there is no need for a drying process, there is no concern about curling, the equipment is inexpensive, and the work efficiency is good.
In terms of price, since the main component is an inexpensive amorphous polyalphaolefin, recyclable moisture-proof paper can be provided at a low cost.
Claims (3)
（Ａ）プロピレンを単独重合あるいはプロピレンとエチレン又はブテン−１を共重合した分子量１０００〜１０００００のアモルファスポリアルファオレフィン４０〜５５重量部、
（Ｂ）粘着付与剤１０〜２５重量部、
（Ｃ）ワックス２０〜３５重量部、
（Ｄ）ポリプロピレンオリゴマー２〜１０重量部、
（Ｅ）相溶化剤１〜７重量部。Water dispersible hot melt composition comprising the following components (A) to (E) [100 parts by weight in total of (A), (B), (C), (D), (E)] object:
(A) 40 to 55 parts by weight of an amorphous polyalphaolefin having a molecular weight of 1,000 to 100,000 obtained by homopolymerizing propylene or copolymerizing propylene and ethylene or butene-1 ,
(B) 10 to 25 parts by weight of a tackifier,
(C) 20 to 35 parts by weight of wax,
(D) 2 to 10 parts by weight of a polypropylene oligomer,
(E) 1 to 7 parts by weight of a compatibilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34431397A JP3722402B2 (en) | 1997-11-28 | 1997-11-28 | Water dispersible hot melt composition, moisture-proof paper using the same, and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34431397A JP3722402B2 (en) | 1997-11-28 | 1997-11-28 | Water dispersible hot melt composition, moisture-proof paper using the same, and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11158330A JPH11158330A (en) | 1999-06-15 |
| JP3722402B2 true JP3722402B2 (en) | 2005-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP34431397A Expired - Fee Related JP3722402B2 (en) | 1997-11-28 | 1997-11-28 | Water dispersible hot melt composition, moisture-proof paper using the same, and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001004209A1 (en) * | 1999-07-08 | 2001-01-18 | Goyo Paper Working Co., Ltd. | Resin compositions, water-resistant/moisture-proof paper containing the same, and process for producing the same |
| JP4597307B2 (en) * | 2000-03-09 | 2010-12-15 | 東邦化学工業株式会社 | Method for producing composite resin emulsion for adhesive |
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| JPH11158330A (en) | 1999-06-15 |
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