초록 ▼

Two packaging materials for photosensitive materials characterized by utilizing linear low density polyethylene (L-LDPE) resin having a specific character. One packaging material is a thick coextruded multilayer film comprising an L-DLPE resin film layer mainly composed of an L-LDPE resin specified

Two packaging materials for photosensitive materials characterized by utilizing linear low density polyethylene (L-LDPE) resin having a specific character. One packaging material is a thick coextruded multilayer film comprising an L-DLPE resin film layer mainly composed of an L-LDPE resin specified by the density and the melt index (MI) and a polyethylene resin film layer blended with a medium or high density polyethylene resin having a high MFR, Melt fracture and blocking do not occur, and the film is excellent in flexibility, in spite of being a thick film. The other packaging material is a single layer film of a light-shielding L-LDPE resin film layer characterized by the combination of two kinds of L-LDPE resin. The packaging material is excellent in all physical strength, particularly tear strength and impact puncture strength, antiblocking property, antistatic properties, heat sealing properties and bag-making ability. The generations of lumps and fish eyes are rare, and the film moldabily is excellent.

대표청구항 ▼

A packaging material for photosensitive materials, which comprises a coextruded multilayer film having a thickness of more than 120 m50 wt. % of linear low density polyethylene having a density of less than 0.925 g/cm3 and a melt index of 1.0 to 7.0 g/10 minutes allocated as one surface layer and a

A packaging material for photosensitive materials, which comprises a coextruded multilayer film having a thickness of more than 120 m50 wt. % of linear low density polyethylene having a density of less than 0.925 g/cm3 and a melt index of 1.0 to 7.0 g/10 minutes allocated as one surface layer and a polyethylene resin film layer containing more than 5 wt. % of polyethylene resin having a density of more than 0.930 g/cm3 and a melt index of more than 0.5 g/10 minutes allocated as the other surface layer, and containing a light-shielding material in either or both of the above layers.