Patent EP-2151319-A1 (EP)
Inventor: NICOLA THOMAS
IPC: B29C48/06
Filed: 2008-08-08
Abstract: Stopper with two opposite front sides, comprises a core and optionally one or more layers enclosing the core, where the stopper comprises: (a) a core of a plastic material from one or more polymers with a high resilience comprising e.g. polyphenylene oxide, or polyethylene copolymers; (b) optionally one or more intermediate layer(s) of a plastic material of one or more polymers of e.g. functionalized polypropylene, or styrene/ethylene/propylene copolymer; and (c) optionally an outer layer of a plastic material of one or more polymers of e.g. polyester, or polyethylene plastomer. Stopper with two opposite front sides, comprises a core and optionally one or more layers enclosing the core, where the stopper comprises: (a) a core of a plastic material from one or more polymers with a high resilience comprising polyphenylene oxide, polyethylene copolymers, ethylene vinyl acetate, styrene/ ethylene/butylene block copolymer, styrene/ethylene/propylene copolymer, polypropylene, medical white oil, styrene/butadiene/styrene copolymer, polybutylene, ethylene/propylene/diene-rubber, ethylene/propylene plastic, or styrene/butadiene/styrene block polymer; (b) optionally one or more intermediate layer(s) of a plastic material of one or more polymers of functionalized polypropylene, polyethylene, functionalized styrene/ ethylene/butylene block copolymer, polyethylene plastomer, polyethylene copolymer, ethylene-vinyl acetate, styrene/ethylene/propylene copolymer, oil, polypropylene, polyethylene, styrene/isoprene/styrene block copolymer, or polybutylene; and (c) optionally an outer layer of a plastic material of one or more polymers of polypropylene, polyester, polycarbonate, polyethylene copolymer, polyethylene plastomer, ethylene vinyl acetate, poly(cyclohexylene dimethylene cyclohexanedicarboxylate), glycol and acid comonomer or styrene/ ethylene/butylene block copolymer/styrene/ethylene/propylene copolymer, polymethylpentene, polybutylene, and/or soft PVC, where the material of the core (a) in the absence of the outer layer (c) or the material of the outer layer (c) of the stopper is flowable at greater than 90[deg] C. Independent claims are included for: (1) a method for producing the stopper, comprising producing a multilayer strand by coextrusion of plastic materials for the layers (a), (c) and optionally (b), (b1) optionally cooling the produced strand in step (a), and (c1) optionally winding up to a coil, optionally applying a notch, (d1) optionally coating the front side of the strand with a foil, (e1) cutting the strand to the desired length of the stopper, (f1) optionally applying a further notch, and (g1) optionally coating the other front side of the stopper with a foil as tamper evident closure; and (2) producing a medical bag, comprising (a11) providing the stopper that is provided optionally with one or two notch(es) and optionally with one or two coating(s), and two bag-like foils, (b11) placing the stopper between the two bag-like foils, (c11) producing the medical bag by welding the bag-like foils, and welding and performing a heat treatment for connecting the stopper with the bag-like foils, and (d11) optionally coating the outer front side of the stopper with a foil as a tamper evident closure.