Water swellable composite rubbers and their preparation and use.

摘要

The invention concerns composite rubbers swellable with water and aqueous solutions, method of their production, and their use. The composite rubbers consist of a rubber matrix, based on rubbers which can be vulcanized at temperatures up to 150 DEG C, and a hydrogel filler, preferably in an amount of 10 to 120 mass-%, based on the mass of rubber matrix. Suitable rubbers are natural rubber, butadiene-styrene rubbers, acrylonitrile-butadiene rubbers, bromobutyl rubbers, and ethylene-propylene rubbers. The composite rubbers are prepared by blending the powdery filler into a non-crosslinked rubber which is then shaped and crosslinked by known methods at 15 to 150 DEG C. The composite rubbers may be used in the form of shaped articles for medical and pharmaceutical purposes, such as implants, articles for controlled drug release, or articles for intradermal drug release.