METHOD FOR MANUFACTURING ADHESIVE USING EXTRUSION

PROBLEM TO BE SOLVED: To provide an improved manufacturing method of a hot melt adhesive.SOLUTION: A manufacturing method of a hot melt adhesive, which is an extrusion manufacturing method of an adhesive containing i) at least one degraded polypropylene (co)polymer (hereafter described as PP) and ii) at least one additional additive, includes the following steps of: a) supplying PP having a weight average molecular weight of at least 250,000 g/mol to a first extrusion section 2 and performing thermomechanical degradation of the PP by a shear stress; b) transferring the degraded PP from the first extrusion section 2 to a second extrusion section 3; and c) supplying at least one tackifying resin to the second extrusion section 3 as an additive and mixing it with the PP under a shear stress. The first extrusion section 2 and the second extrusion section 3 are connected so that the degraded PP is transferred in a molten state from the first extrusion section 2 to the second extrusion section 3. The content of radical donor in the degraded PP at the time of entering the second extrusion section 3 is less than 0.01 wt.%.SELECTED DRAWING: Figure 1 【課題】ホットメルト接着剤の改善された製造方法の提供。【解決手段】ｉ）少なくとも１種の分解ポリプロピレン（コ）ポリマー（以下ＰＰという）と、ｉｉ少なくとも１種の追加添加剤と、を含有する接着剤の押出製造方法で、以下の工程を、含むホットメルト接着剤の製造方法。ａ）第１押出セクション２に、少なくとも２５００００ｇ／ｍｏｌの重量平均分子量を有するＰＰを供給し、剪断応力により前記ＰＰを熱機械的分解する工程、ｂ）該分解ＰＰを、第１押出セクション２から第２押出セクション３へ移送する工程；ｃ）第２押出セクション３に少なくとも１種の添加剤として粘着付与樹脂を供給し、該ポリマーと剪断応力下でブレンドする工程；を含み、該分解ＰＰが、第１押出セクション２から第２押出セクション３へ溶融状態で移送されるように接続し、第２押出セクション３に入る際の分解ＰＰのラジカル供与体含量は０.０１重量％未満である、方法。【選択図】図１