MULTILAYER SEALANT FILM

• Main Authors: TAJIMA TOMOKI, SATO TAKEKAZU, SADAHIRO SHOGO, KURAMOTO NAOHIKO
• Format: Patent
• Language: English; Japanese
• Published: 21.01.2016
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a sealant film providing a sealed package capable simply of opening while having high heat seal strength without depending on a heat seal condition.SOLUTION: There is provided a multilayer sealant film having a laminate layer as an outermost layer, at least one intermediate layer and a heat seal layer as another outermost layer and used by laminating the laminate layer on a substrate film as a sticking surface, where the laminate layer consists of a resin containing a polybutene-based resin of 30 to 70 pts.wt., a linear low density polyethylene resin of 20 to 60 pts.wt. and a low density polyethylene resin having density of 0.930 g/cmor more of 10 to 50 pts.wt., at least one intermediate layer contains at least 80 wt.% of a polypropylene resin, the heat seal layer consists of a resin containing a propylene-based random polymer and a crystallinity by an IR method is in a range of 40 to 65%. 【課題】ヒートシール条件に依存せずに、高いヒートシール強度を有しつつ、容易に開封可能な密封包装体を与えるシーラントフィルムを提供すること。【解決手段】最外層であるラミネート層と、少なくとも１層の中間層と、もう一方の最外層であるヒートシール層とを有し、上記ラミネート層側を貼付面として基材フィルムに貼付して使用される多層シーラントフィルムであって、上記ラミネート層が、ポリブテン系樹脂３０〜７０重量部、直鎖状低密度ポリエチレン樹脂２０〜６０重量部および密度０．９３０ｇ／ｃｍ３以上である低密度ポリエチレン樹脂１０〜５０重量部を含有する樹脂からなり、上記少なくとも１層の中間層が、ポリプロピレン系樹脂を少なくとも８０重量％で含み、そして、上記ヒートシール層が、プロピレン系ランダム共重合体を含有する樹脂からなりそしてＩＲ法による結晶化度が４０〜６５％の範囲にある、前記多層シーラントフィルム。【選択図】なし