JP2014177563A - Resin composition, aqueous coating liquid, and coated film - Google Patents

Resin composition, aqueous coating liquid, and coated film Download PDF

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JP2014177563A
JP2014177563A JP2013052922A JP2013052922A JP2014177563A JP 2014177563 A JP2014177563 A JP 2014177563A JP 2013052922 A JP2013052922 A JP 2013052922A JP 2013052922 A JP2013052922 A JP 2013052922A JP 2014177563 A JP2014177563 A JP 2014177563A
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resin composition
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water resistance
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JP6161341B2 (en
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Ikuhiro Asano
育洋 浅野
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Nippon Synthetic Chemical Industry Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a coating having excellent water proofness even when it is made thin.SOLUTION: A resin composition comprises an acetoacetyl group-containing polyvinyl alcohol resin, an aldehyde compound, and an imidazole compound represented by general formula (1), where R-Rrepresent hydrogen or an alkyl group, provided that the number of carbon atoms of R-Rare 0-10 in total.

Description

本発明は、アセトアセチル基含有ポリビニルアルコール系樹脂と、その架橋剤としてアルデヒド化合物を含有する樹脂組成物に関するものであって、耐水性に優れる皮膜が得られる樹脂組成物に関するものである。   The present invention relates to an acetoacetyl group-containing polyvinyl alcohol resin and a resin composition containing an aldehyde compound as a crosslinking agent thereof, and relates to a resin composition from which a film having excellent water resistance can be obtained.

ポリビニルアルコール系樹脂(以下、PVA系樹脂という)は、代表的な水溶性樹脂として知られており、水溶性という特性を生かして、水系の皮膜形成剤、接着剤、バインダーなどの種々の用途に適用されている。
しかしながら、PVA系樹脂は、水溶性であるがために、これから得られた皮膜は湿気などの水分に弱く、高湿度下で使用される用途に適用しづらいという難点があった。
そこで、PVA系樹脂に耐水性を付与するために、架橋剤を配合し、PVA系樹脂との架橋構造体を形成させることが行われている。中でもアセトアセチル基含有PVA系樹脂(以下、AA化PVAという)は反応性に富むアセトアセチル基(以下、AA基という)を側鎖に有するため、種々の架橋剤により架橋構造体を形成し、優れた耐水性を得ることができることが知られている。
Polyvinyl alcohol-based resins (hereinafter referred to as PVA-based resins) are known as typical water-soluble resins, and take advantage of their water-soluble properties for various applications such as water-based film-forming agents, adhesives, and binders. Has been applied.
However, since the PVA-based resin is water-soluble, the film obtained therefrom is weak against moisture such as moisture, and has a drawback that it is difficult to apply to applications used under high humidity.
Therefore, in order to impart water resistance to the PVA resin, a crosslinking agent is blended to form a crosslinked structure with the PVA resin. Among them, since the acetoacetyl group-containing PVA resin (hereinafter referred to as AA-PVA) has a reactive acetoacetyl group (hereinafter referred to as AA group) in the side chain, it forms a crosslinked structure with various crosslinking agents, It is known that excellent water resistance can be obtained.

かかるAA化PVAに用いられる架橋剤は種々の化合物が知られており、中でも、アルデヒド化合物がAA基との反応性に優れ、比較的低温で架橋反応が進行することから様々な用途に用いられている。
例えば、AA化PVA系樹脂をアルデヒド化合物であるグリオキザールで架橋して得られた架橋高分子は、感熱記録用媒体の表面保護層(例えば、特許文献1参照。)や、偏光板における偏光フィルムと保護フィルムとの接着層(例えば、特許文献2参照。)等に好適に用いられている。
また、エチレン性不飽和単量体に由来する繰り返し構造単位を含む重合体を分散質とし、分散剤としてAA化PVAを用いて得られた水性エマルジョンに対し、架橋剤としてグリオキザールを用い、かかるエマルジョンの乾燥被膜に耐水性を付与した例も知られている(例えば、特許文献3参照。)
Various compounds are known as crosslinking agents used for such AA-PVA, and among them, aldehyde compounds are excellent in reactivity with AA groups, and are used for various applications because crosslinking reaction proceeds at a relatively low temperature. ing.
For example, a cross-linked polymer obtained by cross-linking AA-PVA-based resin with glyoxal, which is an aldehyde compound, is a surface protective layer of a thermal recording medium (see, for example, Patent Document 1) or a polarizing film in a polarizing plate. It is suitably used for an adhesive layer with a protective film (see, for example, Patent Document 2).
Further, the emulsion containing a repeating structural unit derived from an ethylenically unsaturated monomer is used as a dispersoid, and an aqueous emulsion obtained by using AA-PVA as a dispersing agent, glyoxal is used as a cross-linking agent. An example in which water resistance is imparted to the dry film is also known (see, for example, Patent Document 3).

さらに近年では、臭気がなく、安全性に優れ、さらに、AA化PVAとの混合水溶液の安定性に優れ、耐水性に優れ、経時着色が小さい架橋高分子が得られるアルデヒド化合物系の架橋剤として、グリオキシル酸塩が提案されている(例えば、特許文献4参照)。
特開平9−164763号公報 特開平7−198945号公報 特開平11−279509号公報 特開2010−077385号公報
In recent years, as an aldehyde compound-based crosslinking agent that has no odor, is excellent in safety, is excellent in the stability of a mixed aqueous solution with AA-PVA, is excellent in water resistance, and has a low cross-coloring property over time. Glyoxylate has been proposed (see, for example, Patent Document 4).
JP-A-9-164863 JP-A-7-198945 JP 11-279509 A JP 2010-077385 A

PVA系樹脂はガスバリア性に優れることから、その水溶液をフィルムや成形体の表面に塗工、乾燥させ、ガスバリア層を形成することで、食品等の包装材料用途に広く用いられている。
しかしながら、PVA系樹脂は耐水性に乏しいことから、PVA系樹脂層の両側に耐水性に優れる熱可塑性樹脂を保護層として配置するサンドイッチ構造での使用が主であったが、近年は包装材の薄膜化の要求から、保護層を用いず、PVA系樹脂層が表面となる構成が検討されている。そのため、PVA系樹脂層に耐水性が求められている。また、PVA系樹脂層自体の薄膜化も求められているが、薄膜になればなるほど、高度な耐水性が必要となるため、PVA系樹脂層のさらなる耐水性の向上が必要となっている。
そこで、本発明は、薄膜にした場合でも耐水性に優れるPVA系樹脂皮膜が得られる樹脂組成物を提供することを目的とする。
Since the PVA-based resin is excellent in gas barrier properties, it is widely used for packaging materials such as foods by coating and drying the aqueous solution on the surface of a film or a molded body to form a gas barrier layer.
However, since the PVA resin is poor in water resistance, it has been mainly used in a sandwich structure in which a thermoplastic resin having excellent water resistance is disposed on both sides of the PVA resin layer as a protective layer. From the demand for thinning, a configuration in which a PVA-based resin layer is the surface without using a protective layer has been studied. Therefore, water resistance is required for the PVA-based resin layer. Moreover, although thinning of the PVA-based resin layer itself is also demanded, the thinner the film, the higher the level of water resistance required. Therefore, it is necessary to further improve the water resistance of the PVA-based resin layer.
Then, an object of this invention is to provide the resin composition from which the PVA-type resin film which is excellent in water resistance is obtained even when it makes it a thin film.

本発明者らは、上記事情に鑑み、鋭意検討した結果、AA化PVA、アルデヒド化合物、及び下記一般式(1)で表されるイミダゾールを含有する樹脂組成物によって本発明の目的が達成されることを見出し、本発明を完成した。

Figure 2014177563
(R〜Rは水素又はアルキル基を示す。ただし、R〜Rの炭素数の合計が0〜10である。) As a result of intensive studies in view of the above circumstances, the inventors of the present invention have achieved the object of the present invention by a resin composition containing AA-PVA, an aldehyde compound, and imidazole represented by the following general formula (1). As a result, the present invention has been completed.
Figure 2014177563
(R 1 to R 4 represent hydrogen or an alkyl group. However, the total number of carbon atoms of R 1 to R 4 is 0 to 10.)

本発明の効果の発現メカニズムは、明確には解明されていないが、AA化PVAがアルデヒド化合物によって架橋される際に、イミダゾールの窒素原子が、AA化PVA中のAA基のメチレン水素を引き寄せて、AA基を陰イオン化させ、アルデヒドの陽イオンとの反応を促進するものであると推測される。従って、イミダゾールは、AA基とアルデヒド化合物との反応における触媒のような作用を持っていると推測される。   Although the expression mechanism of the effect of the present invention has not been clearly clarified, when AA-PVA is crosslinked by an aldehyde compound, the nitrogen atom of imidazole attracts the methylene hydrogen of the AA group in AA-PVA. It is presumed that the AA group is anionized to promote the reaction of the aldehyde with the cation. Therefore, it is presumed that imidazole has a catalytic action in the reaction between the AA group and the aldehyde compound.

本発明の樹脂組成物は、水性塗工液とし、基材に塗工してガスバリア性皮膜を形成した場合、かかる皮膜が薄膜であっても優れた耐水性が得られる。   When the resin composition of the present invention is an aqueous coating solution and is applied to a substrate to form a gas barrier film, excellent water resistance can be obtained even if the film is a thin film.

以下、本発明について詳細に説明する。
以下に記載する構成要件の説明は、本発明の実施態様の一例(代表例)であり、これらの内容に特定されるものではない。
Hereinafter, the present invention will be described in detail.
The description of the constituent requirements described below is an example (representative example) of an embodiment of the present invention, and is not limited to these contents.

〔AA化PVA〕
本発明に用いるAA化PVAとは、側鎖にアセト酢酸エステル基を有するPVA系樹脂であり、その他の部分は一般のPVA系樹脂と同様、ビニルアルコール系構造単位を主体とし、ケン化度に応じた酢酸ビニル構造単位を有するものである。
本発明で用いられるAA化PVAは、アセト酢酸エステル基を含有する構造単位を有するもので、かかる構造単位は特に限定されるものではないが、例えば下記の一般式(2)で表すものを挙げることができる。

Figure 2014177563
[AA-modified PVA]
The AA-PVA used in the present invention is a PVA-based resin having an acetoacetate group in the side chain, and the other parts are mainly composed of a vinyl alcohol-based structural unit as in general PVA-based resins. It has a corresponding vinyl acetate structural unit.
The AA-PVA used in the present invention has a structural unit containing an acetoacetate group, and the structural unit is not particularly limited, and examples thereof include those represented by the following general formula (2). be able to.
Figure 2014177563

本発明のAA化PVAの平均重合度は、その用途によって適宜選択すればよいが、通常、200〜4000であり、好ましくは300〜3000、特に好ましくは400〜2000、更に好ましくは400〜1000のものが好適に用いられる。かかる平均重合度が小さすぎると、十分な耐水性が得られなかったり、十分な架橋速度が得られなくなる傾向があり、逆に大きすぎると、水溶液として使用した場合に、その粘度が高くなりすぎ、基材への塗工が困難になるなど、各種工程への適用が難しくなる傾向がある。   The average degree of polymerization of the AA-modified PVA of the present invention may be appropriately selected depending on its use, but is usually 200 to 4000, preferably 300 to 3000, particularly preferably 400 to 2000, and more preferably 400 to 1000. Those are preferably used. If the average degree of polymerization is too small, sufficient water resistance may not be obtained or a sufficient crosslinking rate may not be obtained. On the other hand, if it is too large, the viscosity becomes too high when used as an aqueous solution. Application to various processes tends to be difficult, for example, coating on a substrate becomes difficult.

また、本発明に用いられるAA化PVAのケン化度は、通常、80モル%以上であり、さらには90モル%以上、特には98モル%以上ものが好適に用いられる。かかるケン化度が低い場合には、水溶液とすることが困難になったり、水溶液の安定性が低下したり、得られる架橋高分子の耐水性やガスバリア性が不十分となる傾向がある。なお、平均重合度およびケン化度はJIS K6726に準じて測定される。   The saponification degree of the AA-PVA used in the present invention is usually 80 mol% or more, more preferably 90 mol% or more, and particularly preferably 98 mol% or more. When the degree of saponification is low, it tends to be difficult to obtain an aqueous solution, the stability of the aqueous solution decreases, and the water resistance and gas barrier properties of the resulting crosslinked polymer tend to be insufficient. The average degree of polymerization and the degree of saponification are measured according to JIS K6726.

また、AA化PVAのアセトアセチル基含有量(以下、AA化度という。)は、通常、0.1〜20モル%であり、さらには1〜10モル%、特には3〜7モル%であるものが一般的に広く用いられる。かかる含有量が少なすぎると、耐水性が不十分となったり、十分な架橋速度が得られなくなる傾向があり、逆に多すぎると、水溶性が低下したり、水溶液の安定性が低下する傾向がある。   Further, the content of acetoacetyl group (hereinafter referred to as AA degree) of AA-modified PVA is usually 0.1 to 20 mol%, further 1 to 10 mol%, particularly 3 to 7 mol%. Some are generally widely used. If the content is too small, the water resistance tends to be insufficient or a sufficient crosslinking rate may not be obtained. Conversely, if the content is too large, the water solubility tends to decrease or the stability of the aqueous solution tends to decrease. There is.

かかるAA化PVAの製造法としては、特に限定されるものではないが、例えば、PVA系樹脂とジケテンを反応させる方法、PVA系樹脂とアセト酢酸エステルを反応させてエステル交換する方法、酢酸ビニルとアセト酢酸ビニルの共重合体をケン化する方法等を挙げることができるが、製造工程が簡易で、品質の良いAA化PVAが得られることから、PVA系樹脂とジケテンを反応させる方法が好ましく用いられ、詳しくは、特開2012−232416号公報の段落番号〔0013〕〜〔0019〕に記載の方法で製造することができる。   The method for producing the AA-PVA is not particularly limited. For example, a method of reacting a PVA-based resin with diketene, a method of reacting a PVA-based resin with acetoacetate, transesterification, and vinyl acetate A method of saponifying a copolymer of vinyl acetoacetate can be mentioned, but a method of reacting a PVA resin and diketene is preferably used because a production process is simple and a high quality AA-PVA is obtained. Specifically, it can be produced by the method described in paragraphs [0013] to [0019] of JP2012-232416A.

〔アルデヒド化合物〕
本発明で用いられるアルデヒド化合物としては、ホルムアルデヒド、アセトアルデヒド、プロピオンアルデヒド、クロトンアルデヒド、ベンズアルデヒド、グリオキシル酸塩等のモノアルデヒド類;グリオキザール、グルタルアルデヒド、テレフタルアルデヒド、マロンジアルデヒド、スクシンジアルデヒド、ジアルデヒド澱粉などのジアルデヒド類が挙げることができる。中でもAA化PVAとの混合水溶液とした時際の安定性に優れ、耐水性に優れるPVA系樹脂皮膜が得られる点で、グリオキシル酸塩が好適に用いられる。
[Aldehyde compound]
Examples of the aldehyde compound used in the present invention include monoaldehydes such as formaldehyde, acetaldehyde, propionaldehyde, crotonaldehyde, benzaldehyde, glyoxylate; glyoxal, glutaraldehyde, terephthalaldehyde, malondialdehyde, succinaldehyde, dialdehyde starch And dialdehydes. Among these, glyoxylate is preferably used in that a PVA-based resin film having excellent stability when mixed with an AA-PVA and excellent water resistance can be obtained.

かかるグリオキシル酸塩としては、グリオキシル酸の金属塩やアミン塩などが挙げられ、金属塩としては、例えばリチウム、ナトリウム、カリウムなどのアルカリ金属、マグネシウム、カルシウムなどのアルカリ土類金属、チタン、ジルコニウム、クロム、マンガン、鉄、コバルト、ニッケル、銅などの遷移金属、その他の亜鉛、アルミニウムなどの金属とグリオキシル酸の金属塩、また、アミン塩としては、アンモニア、モノメチルアミン、ジメチルアミン、トリメチルアミンなどのアミン類とグリオキシル酸の塩が挙げられる。
特に、耐水性に優れるPVA系樹脂皮膜が得られる点から金属塩、特にアルカリ金属、およびアルカリ土類金属の塩が好ましく用いられる。
Examples of the glyoxylate include metal salts and amine salts of glyoxylic acid. Examples of the metal salt include alkali metals such as lithium, sodium and potassium, alkaline earth metals such as magnesium and calcium, titanium, zirconium, Transition metals such as chromium, manganese, iron, cobalt, nickel, copper, other metals such as zinc and aluminum and metal salts of glyoxylic acid, and amine salts include amines such as ammonia, monomethylamine, dimethylamine, and trimethylamine And salts of glyoxylic acid.
In particular, metal salts, particularly alkali metal and alkaline earth metal salts are preferably used from the viewpoint that a PVA-based resin film having excellent water resistance can be obtained.

かかるアルデヒド化合物の配合量は、特に限定されないが、通常、AA化PVA100重量部に対して1〜10重量部、好ましくは1〜8重量部、より好ましくは4〜8重量部である。また、AA基1モルに対して通常、0.1〜2モル、好ましくは0.5〜1.5モルである。かかる配合量が少なすぎると本発明の効果が得られない傾向にあり、多すぎると耐水性が低下する傾向があり好ましくない。   Although the compounding quantity of this aldehyde compound is not specifically limited, Usually, it is 1-10 weight part with respect to 100 weight part of AA-ized PVA, Preferably it is 1-8 weight part, More preferably, it is 4-8 weight part. Moreover, it is 0.1-2 mol normally with respect to 1 mol of AA groups, Preferably it is 0.5-1.5 mol. If the amount is too small, the effects of the present invention tend not to be obtained, and if too large, the water resistance tends to decrease, which is not preferable.

〔イミダゾール化合物〕
本発明で用いられるイミダゾール化合物は、下記一般式(1)で表されるものである。

Figure 2014177563
(R〜Rは水素又はアルキル基を示す。ただし、R〜Rの炭素数の合計が0〜10である。) [Imidazole compound]
The imidazole compound used in the present invention is represented by the following general formula (1).
Figure 2014177563
(R 1 to R 4 represent hydrogen or an alkyl group. However, the total number of carbon atoms of R 1 to R 4 is 0 to 10.)

本発明で用いられるイミダゾール系化合物としては、置換基の炭素数の合計が0〜10であれば特に限定されないが、例えば、R〜Rが水素であるイミダゾールの他、1−メチルイミダゾール、1−エチルイミダゾール等の1−置換イミダゾール;2−メチルイミダゾール、2−エチルイミダゾール、2−プロピルイミダゾール、2−ブチルイミダゾール、2−ウンデシルイミダゾール、2−ヘプタデシルイミダゾール等の2−置換イミダゾール;1,2−ジメチルイミダゾール、1−エチル−2−メチルイミダゾール等の1,2−置換イミダゾール;2−エチル−4−メチルイミダゾール、2−エチル−4−メチルイミダゾール等の2,4−置換イミダゾール等を挙げることができ、中でも扱いやすい点で、1,2−ジメチルイミダゾール、2−エチル−4−メチルイミダゾールが好ましい。 The imidazole compound used in the present invention is not particularly limited as long as the total number of carbon atoms of the substituents is 0 to 10. For example, in addition to imidazole in which R 1 to R 4 are hydrogen, 1-methylimidazole, 1-substituted imidazole such as 1-ethylimidazole; 2-substituted imidazole such as 2-methylimidazole, 2-ethylimidazole, 2-propylimidazole, 2-butylimidazole, 2-undecylimidazole, 2-heptadecylimidazole; 1 1,2-substituted imidazole such as 2-dimethylimidazole and 1-ethyl-2-methylimidazole; 2,4-substituted imidazole such as 2-ethyl-4-methylimidazole and 2-ethyl-4-methylimidazole 1,2-dimethylimida, which is easy to handle Lumpur, 2-ethyl-4-methylimidazole preferred.

かかるイミダゾール化合物の含有量としては、特に限定されないが、AA化PVA100重量部に対して0.01〜10重量部であることが好ましく、より好ましくは0.01〜1重量部、特に好ましくは0.5〜0.8重量部である。また、アセトアセチル基1モルに対して通常、0.001〜1モル、好ましくは0.001〜0.5モル、特に好ましくは0.05〜0.3モルである。さらに、アルデヒド基1モルに対して通常0.0005〜0.5モル、好ましくは0.0025〜0.1モルである。かかる配合量が少なすぎると本発明の効果が得られない傾向にあり、多すぎると耐水性が低下する傾向があり好ましくない。   The content of the imidazole compound is not particularly limited, but is preferably 0.01 to 10 parts by weight, more preferably 0.01 to 1 part by weight, and particularly preferably 0 to 100 parts by weight of AA-PVA. .5 to 0.8 parts by weight. Moreover, it is 0.001-1 mol normally with respect to 1 mol of acetoacetyl groups, Preferably it is 0.001-0.5 mol, Most preferably, it is 0.05-0.3 mol. Furthermore, it is 0.0005-0.5 mol normally with respect to 1 mol of aldehyde groups, Preferably it is 0.0025-0.1 mol. If the amount is too small, the effects of the present invention tend not to be obtained, and if too large, the water resistance tends to decrease, which is not preferable.

〔水性塗工液〕
本発明の水性塗工液は、前記のAA化PVA、アルデヒド化合物及びイミダゾール化合物を含有するものであり、各成分の配合方法及び配合順序は特に限定されるものではないが、AA化PVA水溶液にアルデヒド化合物を配合し、かかる水溶液にイミダゾール水溶液を配合する方法が好ましい。
[Water-based coating solution]
The aqueous coating liquid of the present invention contains the AA-PVA, the aldehyde compound, and the imidazole compound, and the blending method and blending order of each component are not particularly limited. A method of blending an aldehyde compound and blending such an aqueous solution with an imidazole aqueous solution is preferable.

かかる水性塗工液の濃度は、通常0.5〜40重量%、好ましくは、0.5〜20重量%、更に好ましくは5〜15重量%である。かかる濃度が大きすぎると流動性が低下する傾向があり、小さすぎると造膜不良になる傾向がある。   The concentration of the aqueous coating solution is usually 0.5 to 40% by weight, preferably 0.5 to 20% by weight, and more preferably 5 to 15% by weight. If the concentration is too large, the fluidity tends to decrease, and if it is too small, the film formation tends to be poor.

かかる水性塗工液のpHは通常3〜14で、好ましくは5〜12で、更に好ましくは7〜10である。かかるpHが大きすぎると増粘する傾向があり、小さすぎると耐水性が得られない傾向がある。   The pH of the aqueous coating solution is usually 3 to 14, preferably 5 to 12, and more preferably 7 to 10. If the pH is too high, the viscosity tends to increase, and if it is too low, the water resistance tends not to be obtained.

本発明の水性塗工液には、本発明の趣旨や皮膜性能を損なわない範囲で、可塑剤、滑剤、帯電防止剤、抗菌・防カビ剤、補強剤(強化材、無機充填材)、難燃剤、着色剤等を添加してもよい。   The aqueous coating liquid of the present invention includes a plasticizer, a lubricant, an antistatic agent, an antibacterial / antifungal agent, a reinforcing agent (reinforcing material, inorganic filler), difficulty, and the like within the scope of the present invention and film performance. You may add a flame retardant, a coloring agent, etc.

〔塗膜〕
上記のように得られた水性塗工液は、塗工、注型、浸漬等の公知の方法によって各種用途に適用され、その後、乾燥・熱処理によって架橋反応が行われる。
[Coating]
The aqueous coating solution obtained as described above is applied to various uses by known methods such as coating, casting, and dipping, and then a crosslinking reaction is performed by drying and heat treatment.

かかる架橋反応の温度は、通常60〜200℃であり、更には60〜140℃、特には100〜140℃であることが好ましい。かかる温度が高すぎるとポリビニルアルコール系樹脂が分解してしまい、着色が起こる場合があるため好ましくない。また、温度が低すぎると架橋反応に時間がかかり、生産性が良くないため好ましくない。
架橋反応時間は、通常0.5〜20分、更には0.5〜10分、特には3〜10分であることが好ましい。かかる時間が長すぎると生産性が良くなく、短すぎると十分に架橋した反応物が得られず、耐水性が不十分になる傾向がある。
The temperature of the crosslinking reaction is usually 60 to 200 ° C, more preferably 60 to 140 ° C, particularly preferably 100 to 140 ° C. If the temperature is too high, the polyvinyl alcohol resin is decomposed and coloring may occur, which is not preferable. On the other hand, if the temperature is too low, the crosslinking reaction takes time and the productivity is not good, which is not preferable.
The crosslinking reaction time is usually 0.5 to 20 minutes, more preferably 0.5 to 10 minutes, and particularly preferably 3 to 10 minutes. If the time is too long, the productivity is not good, and if it is too short, a sufficiently crosslinked reaction product cannot be obtained, and the water resistance tends to be insufficient.

本発明の樹脂組成物は、コーティング剤、フィルム、シート、接着層、バインダーの各種の用途に適用できるが、皮膜として用いる場合の厚さは、通常0.01〜100μm、更には0.1〜50μm、特には0.5〜10μmであるのことが好ましい。かかる皮膜が厚すぎると乾燥時間が長くなる傾向があり、また薄すぎると皮膜強度が低下し、架橋皮膜が破れやすくなる傾向がある。   The resin composition of the present invention can be applied to various uses of a coating agent, a film, a sheet, an adhesive layer, and a binder, but when used as a film, the thickness is usually 0.01 to 100 μm, more preferably 0.1 to 0.1 μm. The thickness is preferably 50 μm, particularly 0.5 to 10 μm. If the film is too thick, the drying time tends to be long, and if it is too thin, the film strength is lowered and the crosslinked film tends to be easily broken.

〔ガスバリア性積層体〕
本発明の樹脂組成物はガスバリア性を有するため、ガスバリア性積層体として、紙基材やフィルム基材に塗工することができる。
紙基材とは、洋紙、和紙、板紙などがあるが、一般的にはセルロースを主成分とする植物繊維を、水中で絡み合わせ細かいスクリーン上で得られるフェルト状の薄いシートである。原料に合成繊維や無機繊維を用いたものも含まれる。
また、紙基材と積層させる場合には、ガスバリア性の向上のために、紙基材と本発明の樹脂組成物の間に目止め剤層を設けることが好ましい。かかる目止め層としては、本発明の樹脂組成物との接着性が良好なものなら特に限定されないが、変性されていないPVA、各種の変性PVA系樹脂;ポリエチレン、ポリプロピレンなどのポリオレフィン系樹脂;クレイとバインダー樹脂の組成物などが挙げられる。
[Gas barrier laminate]
Since the resin composition of the present invention has gas barrier properties, it can be applied to a paper substrate or a film substrate as a gas barrier laminate.
The paper base material includes western paper, Japanese paper, paperboard and the like, but generally is a felt-like thin sheet obtained by intertwining plant fibers mainly composed of cellulose in water on a fine screen. Those using synthetic fibers and inorganic fibers as raw materials are also included.
Moreover, when laminating | stacking with a paper base material, it is preferable to provide a sealing agent layer between a paper base material and the resin composition of this invention for the improvement of gas barrier property. The sealing layer is not particularly limited as long as it has good adhesion to the resin composition of the present invention, but is not modified PVA, various modified PVA resins; polyolefin resins such as polyethylene and polypropylene; clay And a binder resin composition.

フィルム基材の材料して用いられる熱可塑性樹脂としては、ポリプロピレン、エチレン−酢酸ビニル共重合体、エチレン−メチルメタクリレート共重合体、アイオノマー樹脂等のポリオレフィン系樹脂;ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等の芳香族ポリエステル系樹脂;ポリ乳酸、ポリブチレンサクシネート、ポリブチレンサクシネートアジペート等の脂肪族ポリエステル系樹脂;ナイロン−6、ナイロン6,6等のポリアミド系樹脂;アクリル系樹脂;ポリスチレン、スチレン−アクリロニトリル等のスチレン系樹脂;トリ酢酸セルロース、ジ酢酸セルロースなどのセルロース系樹脂;ポリ塩化ビニル、ポリ塩化ビニリデン、ポリフッ化ビニリデン等のハロゲン含有樹脂;ポリカーボネート樹脂、ポリスルホン樹脂、ポリエーテルスルホン樹脂、ポリエーテルエーテルケトン樹脂、ポリフェニレンオキシド樹脂、液晶ポリマー等のエンジニアリングプラスチックなどを挙げることができる。   Examples of the thermoplastic resin used as a film base material include polyolefin resins such as polypropylene, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, and ionomer resin; polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate. Aromatic polyester resins such as phthalates; aliphatic polyester resins such as polylactic acid, polybutylene succinate, polybutylene succinate adipate; polyamide resins such as nylon-6 and nylon 6,6; acrylic resins; polystyrene, Styrene resins such as styrene-acrylonitrile; Cellulosic resins such as cellulose triacetate and cellulose diacetate; Halogen-containing resins such as polyvinyl chloride, polyvinylidene chloride, and polyvinylidene fluoride; Over preparative resins, polysulfone resins, polyethersulfone resins, polyether ether ketone resins, polyphenylene oxide resins, and the like engineering plastic such as liquid crystal polymer.

各種基材及び目止め層の厚みはそれぞれ通常、10〜1000μmであり、好ましくは、50〜800μm程度が適当である。   The thicknesses of the various substrates and the sealing layer are usually 10 to 1000 μm, and preferably about 50 to 800 μm.

上述の各種基材に本発明の水性塗工液を塗工する方法としては、ダイレクトグラビア法、リバースグラビア法などのグラビア法;2本ロールビートコート法、ボトムフィード3本ロール法等のロールコーティング法、ドクターナイフ法、ダイコート法、ディップコート法、バーコート法、スリットコート法;など、公知の塗工法を用いることができる。   Examples of the method for applying the aqueous coating solution of the present invention to the above-mentioned various substrates include gravure methods such as direct gravure method and reverse gravure method; roll coating such as two roll beat coating method and bottom feed three roll method. Known coating methods such as a method, a doctor knife method, a die coating method, a dip coating method, a bar coating method, and a slit coating method can be used.

本発明の水性塗工液を基材に塗工した後、乾燥によって水分やその他の揮発分が除かれる。その際の乾燥温度は塗工層の厚さによって適宜調節すべきものであるが、通常は、10〜200℃であり、特に20〜150℃、殊に30〜120℃の範囲が好適に用いられる。また、乾燥時間も、揮発分が所定量以下になるように、上述の乾燥温度に応じて適宜調節されるものであるが、通常は0.1〜120分であり、特に0.5〜60分の範囲で行われる。
かかる加熱、乾燥の過程で、本発明のAA化PVA系樹脂は、アルデヒド化合物によって架橋される。従って、本発明のガスバリア性積層体の塗工層には、AA化PVAがアルデヒド化合物で架橋された架橋構造を有するものが含まれる。
After the aqueous coating liquid of the present invention is applied to a substrate, moisture and other volatile components are removed by drying. The drying temperature at that time should be appropriately adjusted depending on the thickness of the coating layer, but is usually 10 to 200 ° C., and particularly preferably 20 to 150 ° C., particularly 30 to 120 ° C. . Further, the drying time is appropriately adjusted according to the above-mentioned drying temperature so that the volatile component is a predetermined amount or less, but is usually 0.1 to 120 minutes, and particularly 0.5 to 60. Done in minutes.
In the process of heating and drying, the AA-PVA-based resin of the present invention is crosslinked with an aldehyde compound. Therefore, the coating layer of the gas barrier laminate of the present invention includes those having a crosslinked structure in which AA-PVA is crosslinked with an aldehyde compound.

塗工層の膜厚は、通常0.05〜50μmであり、特に0.1〜30μm、殊に1〜20μmの範囲から好ましく選択される。かかる膜厚が薄すぎると、充分なガスバリア性が得られなくなる場合があり、一方、膜厚が厚すぎると、積層体としたときの柔軟性が損なわれる傾向がある。   The film thickness of the coating layer is usually 0.05 to 50 μm, preferably 0.1 to 30 μm, particularly 1 to 20 μm. If the film thickness is too thin, sufficient gas barrier properties may not be obtained. On the other hand, if the film thickness is too thick, the flexibility of the laminate tends to be impaired.

以下に、実施例を挙げて本発明を更に具体的に説明するが、本発明はその要旨を超えない限り、以下の実施例に限定されるものではない。
尚、例中、「部」、「%」とあるのは、断りのない限り重量基準を意味する。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist.
In the examples, “parts” and “%” mean weight basis unless otherwise specified.

実施例1
平均重合度500、ケン化度99モル%、AA化度5.0モル%であるAA化PVA系樹脂の10%水溶液100重量部に、架橋剤としてグリオキシル酸カルシウムを0.57重量部(AA化PVA系樹脂に対して5.7重量%、AA化PVA系樹脂中のAA基に対して1.0当量)添加して混合撹拌し、樹脂組成物水溶液とした。
かかる樹脂組成物に、1,2−ジメチルイミダゾール(1,2−DMI)の1重量%水溶液0.57重量部(AA化PVAに対して、0.057重量%、AA化PVA中のAA基に対して0.1当量)を添加し、攪拌し、塗工液(pH=8.4)を得た。かかる塗工液をコロナ処理PETフィルム上にバーコーターで、コートを行い、120℃で5分乾燥を行い、厚さ3μmの皮膜を得た。
Example 1
To 100 parts by weight of a 10% aqueous solution of AA-PVA-based resin having an average polymerization degree of 500, a saponification degree of 99 mol%, and an AA degree of 5.0 mol%, 0.57 parts by weight of calcium glyoxylate as a crosslinking agent (AA 5.7 wt% with respect to the modified PVA-based resin and 1.0 equivalent with respect to the AA group in the AA-modified PVA-based resin) and mixed and stirred to obtain an aqueous resin composition solution.
To this resin composition, 0.57 parts by weight of a 1% by weight aqueous solution of 1,2-dimethylimidazole (1,2-DMI) (0.057% by weight with respect to AA-PVA, AA group in AA-PVA) 0.1 equivalent) was added and stirred to obtain a coating solution (pH = 8.4). The coating solution was coated on a corona-treated PET film with a bar coater and dried at 120 ° C. for 5 minutes to obtain a film having a thickness of 3 μm.

〔耐水性評価〕
得られた皮膜に、23℃の水を、流量2L/minのシャワーにて30秒流水に接触させた。かかる皮膜を親指と人差し指で挟み、親指で4回表面を擦った後、表面が溶解した面積を測定し、全皮膜面積に対する割合を計算した。結果を表1に示す。
(Water resistance evaluation)
The obtained film was brought into contact with running water at 23 ° C. for 30 seconds in a shower with a flow rate of 2 L / min. The film was sandwiched between the thumb and forefinger, and the surface was rubbed four times with the thumb. Then, the area where the surface was dissolved was measured, and the ratio to the total film area was calculated. The results are shown in Table 1.

実施例2
実施例1において、1,2−ジメチルイミダゾールに替えて、2−エチルー4−メチルイミダゾール(2―E―4―MI)を用いた以外は、実施例1と同様に塗工液(pH=8.3)を得て、耐水性を評価した。結果を表1に示す。
Example 2
In Example 1, a coating solution (pH = 8) was used in the same manner as in Example 1 except that 2-ethyl-4-methylimidazole (2-E-4-MI) was used instead of 1,2-dimethylimidazole. .3) and water resistance was evaluated. The results are shown in Table 1.

比較例1
実施例1において、1,2−ジメチルイミダゾールを配合しなかった外は、実施例1と同様に塗工液(pH=4.5)を得て、耐水性を評価した。なお、pHの調整のため水酸化ナトリウムを用いて、pH=8.8になるように調製した。結果を表1に示す。
Comparative Example 1
In Example 1, except that 1,2-dimethylimidazole was not blended, a coating liquid (pH = 4.5) was obtained in the same manner as in Example 1, and water resistance was evaluated. In addition, it adjusted so that it might become pH = 8.8 using sodium hydroxide for adjustment of pH. The results are shown in Table 1.

Figure 2014177563
評価基準
○:皮膜の溶解なし
△:皮膜が一部溶解
×:皮膜が完全溶解
Figure 2014177563
Evaluation criteria ○: No dissolution of film Δ: Partial dissolution of film ×: Complete dissolution of film

かかる結果から、AA化PVAをアルデヒド化合物で架橋する際に、イミダゾール化合物を含有すると、含有しない場合と比較して、耐水性が向上した。   From this result, when AA-PVA was cross-linked with an aldehyde compound, when the imidazole compound was contained, the water resistance was improved as compared with the case where it was not contained.

本発明の樹脂組成物を含有する塗工液から得られた塗膜は、薄膜にした際の耐水性に優れるため、紙などの基材のコーティングに適しており、包装材料の最外層に好適に用いられる。
The coating film obtained from the coating liquid containing the resin composition of the present invention has excellent water resistance when formed into a thin film, and is therefore suitable for coating a substrate such as paper, and is suitable for the outermost layer of a packaging material. Used for.

Claims (4)

アセトアセチル基含有ポリビニルアルコール系樹脂、アルデヒド化合物及び下記一般式(1)で表されるイミダゾール化合物を含有することを特徴とする樹脂組成物。
Figure 2014177563
(R〜Rは水素又はアルキル基を示す。ただし、R〜Rの炭素数の合計が0〜10である。)
A resin composition comprising an acetoacetyl group-containing polyvinyl alcohol resin, an aldehyde compound, and an imidazole compound represented by the following general formula (1).
Figure 2014177563
(R 1 to R 4 represent hydrogen or an alkyl group. However, the total number of carbon atoms of R 1 to R 4 is 0 to 10.)
アルデヒド化合物がグリオキシル酸塩であることを特徴とする請求項1記載の樹脂組成物。 The resin composition according to claim 1, wherein the aldehyde compound is glyoxylate. 請求項1又は2記載の樹脂組成物と水を含有することを特徴とする水性塗工液。 An aqueous coating solution comprising the resin composition according to claim 1 or 2 and water. 請求項3記載の塗工液を乾燥して得られる塗膜。

The coating film obtained by drying the coating liquid of Claim 3.

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