RESIN COMPOSITION FOR HEAT SEALING

摘要

PURPOSE:To provide a resin composition which facilitates heat sealing and can give a constant opening strength over a wide temperature range. CONSTITUTION:The objective sealant composition consists of 65-90wt.% crystalline polypropylene resin and 35-10wt.% ethylene/propylene random copolymer having a melt index greater than that of the propylene resin. With this composition, opening is effected not by interfacial separation generally employed in heat sealing but by the cohesive failure of a sealant layer; therefore, the opening strength can be estabilished by adjusting the breaking strength of the sealant without being affected by heat sealing conditions.