PACKAGING MATERIALS.

摘要

A heat sealable polymeric film, heat sealing being provided by a blend of (a) from 25 to 75 percent of propylene/ethylene copolymer containing from 2 to 8 percent by weight of units derived from ethylene, (b) from 1 to 60 percent of but-1-ene/ethylene copolymer containing up to 1 percent by weight of units derived from ethylene, and (c) from 1 to 60 percent of but-1-ene/ethylene copolymer containing from 3 to 10 percent by weight of units derived from ethylene, the percentages of the various copolymers being based on the total weight of the blend. Films of the invention have low heat seal threshold temperatures combined with broad ranges of continuous hot tack.