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| - The reservoir matrix can be pressure sensitive adhesive and can e.g. be a rubber material, such as styrene/isoprene/styrene block copolymers, silicone rubber or synthetic resins, such as poly(meth)acrylate, polyurethane, polyvinylether, polyester, etc.???a list of suitable matrix materials appearing e.g. in DE-OS 35 00 508, corresponding to U.S. Pat. No. 4,719,226 the whole content of which is inc
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