SEALANT FILM, MULTILAYER FILM INCLUDING SAME AND PACKAGING BAG
A sealant film including a polyolefin layer containing polyolefin as a main ingredient, and a polycycloolefin layer as an outermost layer containing polycycloolefin as a main ingredient. The polycycloolefin contains two or more kinds of structural units selected from a structural unit (A) derived from a dicyclopentadiene compound, a structural unit (B) derived from a tetracyclododecene compound, and a structural unit (C) derived from a norbornene compound, and the polycycloolefin has a glass transition temperature less than or equal to 80° C.
1 . A sealant film comprising:
a polyolefin layer containing polyolefin as a main ingredient; and
a polycycloolefin layer as an outermost layer containing polycycloolefin as a main ingredient,
wherein the polycycloolefin contains two or more kinds of structural units selected from a structural unit (A) derived from a dicyclopentadiene compound, a structural unit (B) derived from a tetracyclododecene compound, and a structural unit (C) derived from a norbornene compound, and
the polycycloolefin has a glass transition temperature less than or equal to 80° C.
2 . The sealant film according to claim 1 , wherein the polycycloolefin contains the structural unit (A) derived from a dicyclopentadiene compound, the structural unit (B) derived from a tetracyclododecene compound and the structural unit (C) derived from a norbornene compound.
3 . The sealant film according to claim 1 , wherein the polycycloolefin has a glass transition temperature greater than or equal to 40° C.
4 . The sealant film according to claim 1 , wherein the dicyclopentadiene compound is tricyclo [5.2.1.0 2,6 ] deca-3,8-diene or a derivative of tricyclo [5.2.1.0 2,6 ] deca-3,8-diene, the tetracyclododecene compound is tetracyclo [4.4.0.1 2,5 .1 7,10 ]-3-dodecene or a derivative of tetracyclo [4.4.0.1 2,5 .1 7,10 ]-3-dodecene, and the norbornene compound is bicyclo [2.2.1] hept-2-ene or a derivative of bicyclo [2.2.1] hept-2-ene.
5 . The sealant film according to claim 1 , wherein the polycycloolefin is a ring-opening metathesis polymer of two or more kinds of compounds selected from the dicyclopentadiene compound, the tetracyclododecene compound and the norbornene compound, and carbon-carbon double bonds are hydrogenated.
6 . A multilayer film comprising:
a base sheet; and
the sealant film according to claim 1 ,
the sealant film being stacked on the base sheet.
7 . The multilayer film according to claim 6 , further comprising a gas barrier film stacked between the base sheet and the sealant film.
8 . The multilayer film according to claim 6 having a thickness less than or equal to 100 μm.
9 . A packaging bag comprising the multilayer film according to claim 6 sealed such that the sealant films are fused to each other.
10 . A sealant film comprising:
a polyolefin layer containing polyolefin; and
a polycycloolefin layer as an outermost layer containing polycycloolefin as a main ingredient,
wherein the polycycloolefin contains two or more kinds of structural units selected from a structural unit (A) derived from a dicyclopentadiene compound, a structural unit (B) derived from a tetracyclododecene compound, and a structural unit (C) derived from a norbornene compound,
the polycycloolefin has a glass transition temperature less than or equal to 80° C.,
the polyolefin layer has a thickness greater than or equal to 10 μm and less than or equal to 40 m, and
the polycycloolefin layer has a thickness greater than or equal to 5 m and less than or equal to 20 μm.
11 . The sealant film according to claim 10 , wherein the polyolefin layer contains less than or equal to 50% by mass polycycloolefin relative to a mass of the sealant film.
12 . A sealant film comprising:
a polyolefin layer containing polyolefin; and
a polycycloolefin layer as an outermost layer containing polycycloolefin as a main ingredient,
wherein the polycycloolefin contains two or more kinds of structural units selected from a structural unit (A) derived from a dicyclopentadiene compound, a structural unit (B) derived from a tetracyclododecene compound, and a structural unit (C) derived from a norbornene compound,
the polycycloolefin has a glass transition temperature less than or equal to 80° C.,
the polycycloolefin layer has a thickness (T2) greater than or equal to 5 μm and less than or equal to 10 μm, and
a ratio (a) of a thickness (T1) of the polyolefin layer to the thickness (T2) of the polycycloolefin layer is greater than or equal to 3 and less than or equal to 9.