PROBLEM TO BE SOLVED: To provide a heat-adhesive filter which can achieve microbial barrier properties, air permeability and moisture permeability, can be thermal compression bonded to other members with strong adhesion force, can easily adjust the production conditions and has low production cost.SOLUTION: There is provided a heat-adhesive filter which comprises an air permeable paper base material and a heat bonded particles layer provided on at least one surface of the paper base material, the heat bonded particles layer contains heat bondable particles as a main component and comprises the following adhesion auxiliary agents. Adhesion auxiliary agents: one or more resins selected from an acid-modified polyolefin resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, an acid-modified chlorinated polyolefin resin and an acrylic-modified chlorinated polyolefin resin.SELECTED DRAWING: None【課題】遮菌性と透気性、透湿性を両立でき、かつ強い接着力で他の部材に熱圧着でき、しかも製造条件の調整が容易で、製造コストが低い熱接着性フィルタを提供する。【解決手段】透気性の紙基材と、前記紙基材の少なくとも一方の面に設けられた熱接着粒子層とを備え、前記熱接着粒子層は、熱接着性粒子を主成分とすると共に、下記接着補助剤を含有することを特徴とする熱接着性フィルタ。接着補助剤：酸変性ポリオレフィン樹脂、塩素化ポリオレフィン樹脂、塩素化エチレン－酢酸ビニル共重合体樹脂、酸変性塩素化ポリオレフィン樹脂、及びアクリル変性塩素化ポリオレフィン樹脂から選ばれる１種以上の樹脂。【選択図】なし
