Abstract: The present invention provides a manufacturing method for a stopper used in medical containers, the stopper having a septum and a housing supporting the septum, the manufacturing method comprising firstly creating the septum using a first molding process with a thermoplastic elastomer composition; then creating the housing using a second molding process with a plastic composition, by the second molding process the septum being pre-compressed in a radial direction perpendicular to a needle penetration direction of the septum; and subjecting the stopper to a steam sterilization, wherein after the septum experiences the steam sterilization, the septum exhibits a residual pre-compression level of 12% to 30% in the radial direction compared to when the septum is uncompressed, and the residual pre-compression level is measured based on a thickness or average diameter of the septum.

Abstract: The present invention provides a polymer composition for manufacturing a foam, the polymer composition comprising a vinyl aromatic based copolymer and a processing aid, wherein the amount of the processing aid in the total weight of the polymer composition is equal to or more than 5 wt % and equal to or less than 75 wt %; and the polymer composition does not comprise ethylene-vinyl acetate copolymer, ethylene-butyl acrylate copolymer, ethylene-?-olefin copolymer, homopolymer and copolymer of polyethylene, homopolymer and copolymer of polypropylene, homopolymer and copolymer of polybutene and olefin-based ionic polymer. The present invention also provides the foam and the method for forming the same.

Abstract: The present invention provides a polymer composition for manufacturing a foam, the polymer composition comprising a vinyl aromatic based copolymer and a processing aid, wherein the amount of the processing aid in the total weight of the polymer composition is equal to or more than 5 wt % and equal to or less than 75 wt %; and the polymer composition does not comprise ethylene-vinyl acetate copolymer, ethylene-butyl acrylate copolymer, ethylene-?-olefin copolymer, homopolymer and copolymer of polyethylene, homopolymer and copolymer of polypropylene, homopolymer and copolymer of polybutene and olefin-based ionic polymer. The present invention also provides the foam and the method for forming the same.