LAMINATE AND PACKAGING BAG
A laminate including, a base material layer; a first polyethylene resin layer containing a first polyethylene resin and having a melt flow rate of less than 5 g/10 minutes, and a second polyethylene resin layer containing a second polyethylene resin and having a melt flow rate of 5 to 12 g/10 minutes, in this order, in which a ratio R 2 (Mw/Mn) of a weight-average molecular weight Mw to a number average molecular weight Mn of the second polyethylene resin is 7 or less.
1 . A laminate comprising:
a base material layer;
a first polyethylene resin layer comprising a first polyethylene resin and having a melt flow rate of less than 5 g/10 minutes, and
a second polyethylene resin layer comprising a second polyethylene resin and having a melt flow rate of 5 to 12 g/10 minutes,
wherein the base material layer, the first polyethylene resin layer, and the second polyethylene resin laver are laminated in stated order, and
wherein a ratio R 2 (Mw/Mn) of a weight-average molecular weight Mw to a number average molecular weight Mn of the second polyethylene resin is 7 or less.
2 . The laminate according to claim 1 ,
wherein a molecular weight distribution of the first polyethylene resin is sharper than a molecular weight distribution of the second polyethylene resin.
3 . The laminate according to claim 1 ,
wherein a thickness Ta of the first polyethylene resin layer and a thickness Tb of the second polyethylene resin layer satisfy conditions below.
2≤ Tb /( Ta+Tb )×100≤30
4 . The laminate according to claim 1 ,
wherein the base material layer comprises at least a high-density polyethylene resin layer.
5 . The laminate according to claim 1 ,
wherein a polyethylene resin content is 90 mass % or more.
6 . A packaging bag comprising:
the laminate according to claim 1 .
7 . The laminate according to claim 1 further comprising an adhesive layer.