COATING AGENT, MULTILAYER STRUCTURE AND METHOD FOR PRODUCING THE SAME

To provide a coating agent which can provide a multilayer structure including EVOH layers having improved gas barrier properties, is less likely to cause wrinkles when used in a production method in which the EVOH layers are thermocompression bonded to each other, and improves adhesion between the EVOH layers.SOLUTION: The coating agent comprises a modified EVOH (A) and inorganic fine particles. The modified EVOH (A) contains structural units (Ia), (Ib), and (Ic) represented by the following formulas.The molar contents (mol %) a, b and c of the structural units (Ia), (Ib) and (Ic) satisfy the formulas (1) to (3) described in the specification. The degree of saponification (DS) of the modified EVOH (A) is 90 mol % or more. The average particle size of the inorganic fine particles is 10 to 2,000 nm. The content of the inorganic fine particles is 1 to 2,000 ppm by weight based on the weight of the modified EVOH (A). (The symbols in the formulas are as defined in the specification.)SELECTED DRAWING: None 【課題】ガスバリア性の改善されたＥＶＯＨ層を含む多層構造体を提供でき、かつＥＶＯＨ層同士を熱圧着する製造方法で使用した場合にシワが発生しにくく、かつＥＶＯＨ層同士の密着性が改善されるコーティング剤の提供。【解決手段】変性ＥＶＯＨ（Ａ）及び無機微粒子を含有するコーティング剤であって、変性ＥＶＯＨ（Ａ）が下記式で表される構造単位（Ｉａ）、（Ｉｂ）及び（Ｉｃ）を含み、前記各構造単位（Ｉａ）、（Ｉｂ）及び（Ｉｃ）のモル含有率（モル％）ａ、ｂ及びｃが明細書に記載の式（１）～（３）を満たし、変性ＥＶＯＨ（Ａ）のケン化度（ＤＳ）が９０モル％以上であり、前記無機微粒子の平均粒子径が１０～２，０００ｎｍであり、前記無機微粒子の含有量が変性ＥＶＯＨ（Ａ）に対して重量基準で１～２，０００ｐｐｍである、コーティング剤。TIFF2024127188000012.tif29150（式中の各記号は明細書において定義した通りである。）【選択図】なし