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METHOD FOR PRODUCING A CLOSURE WITH THREAD AND A SEALING ELEMENT, AND POLYMER COMPOSITION FOR THE SEALING ELEMENT
METHOD FOR PRODUCING A CLOSURE WITH THREAD AND A SEALING ELEMENT, AND POLYMER COMPOSITION FOR THE SEALING ELEMENT
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机译:生产具有螺纹和密封元件的密封件的方法,以及用于密封元件的聚合物组合物
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摘要
The invention relates to a polymer composition of a sealing insert for a closure with thread for containers used, in particular, for fat-containing filling materials, and to a method for manufacturing such closure. The polymer composition is PVC-free and comprises two different polymers, one of which is a copolymer which includes polyethylene units and alkylene monomer selected from propylene, butylene, hexene and octene, and the other is a random copolymer that is a linear or branched interpolymer of ethylene and at least one C3-C20 alpha-olefin, wherein the polymer composition has Shore A hardness in the range of 45 to 90 and, in accordance with a test ASTM D395-97, method B, shows a compression set of 30-70% at 70°C. The invention provides a PVC-free sealing insert for containers with large-diameter openings with a low degree of migration of chemical substances.
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