Patent ID: 9663643
Date: 2017-05-30
CPC Classifications: C08K,C08L

Claim:
1. A polymer-based composition for a PVC-free sealing insert for a twist crown cap, comprising: at least one oxygen-scavenging substance; 10 to 40 wt % thermoplastic elastomer (TPE) based on styrene-ethylene-butylene-styrene (SEBS); at least one polyolefin component selected from the group consisting of 2 to 20 wt % copolymer consisting of polypropylene and polyethylene, 5 to 25 wt % low-density polyethylene (LDPE), 10-30 wt % linear low-density polyethylene (LLDPE), and combinations thereof; and white oil, wherein the Shore A hardness of the polymer-based composition is between 50 to 90 and the polymer-based composition exhibits a compression set of 30-90% in the compressive deformation test analogous to ASTM D395-97 Method B after 22 hours of storage at 70° C. and a compression of 25%.