| abstract |
PURPOSE: To prepare a packaging material excellent in cryogenic temperature resistance, heat resistance and transparency and useful in storing blood, food, etc., by forming a mixture of specified two ethylenic copolymers into a film or the like and at the same time crosslinking the polymers. n CONSTITUTION: An ethylene unit (a) is reacted with at least one unit (b) selected from a (di)carboxylic acid (anhydride) unit and a half-ester unit to obtain an ethylenic copolymer (A) containing 30W99.5wt% component (a). Separately, component (a) is reacted with at least one unit (c) selected from among a hydroxyl unit, an amino unit and a glycidyl unit to obtain an ethylenic copolymer (B) containing 30W99.5wt% component (a). A mixture obtained by mixing 1W99wt% component A with 99W1wt% component B at room temperature to 150°C is molded at 250°C or below into a film or sheet-form thin-walled material of a thickness of 10W2,000μ and crosslinked by heating to 100W400°C. n COPYRIGHT: (C)1987,JPO&Japio |