| 摘要 |
PURPOSE: To obtain a packaging film improved in gas-barrier properties and moistureproofness and having good slipperiness, heat sealability, and clarity by coating a biaxially oriented polypropylene film with a specific topcoating agent. CONSTITUTION: A packaging film is obtd. by coating both sides of a biaxially oriented polypropylene film with a topcoating agent which contains 100 pts.wt. vinylidene chloride copolymer, 5-15 pts.wt. liq. paraffin, 5-15 -pts.wt. paraffin wax having a mol.wt. of 500-1,000 and an m.p. of 40-100 deg.C, 0.05-0.5 pt.wt. org. or inorg. powder having an average particle size of 1-6μm, and 0.2-1.5 pts.wt. antistatic agent. The liq. paraffin and/or the paraffin wax is present on the surface of and in the topcoating layer as a disperse phase having a lamellar structure with an average particle size of 0.1-0.7μm. The vinylidene chloride content of the copolymer is pref. 80-92wt.%. |
