Patent ID: 6440461
Filing Date: 2002-08-27
Classification: A61K,C08J

Abstract:
microspheres having an average diameter of between 1 &mgr;m and 100&mgr;m comprising a continuous network of a support material, said network being selected from the group consisting of a dense network and a network incorporating a dispersed aqueous phase, said support material containing at least 70% by weight of a homopolymer comprising recurring units of a general formula (I): in which:R1 represents a radical selected from the group consisting of an alkyl group having 1 to 6 carbon atoms and a (CH2)m â€”COOR group in which m is an integer of between 1 and 5 and R3 represents an alkyl group having 1 to 6 carbon atoms; R2 represents an alkyl group having 1 to 6 carbon atoms; and n is an integer of between 1 and 5; said homopolymer having a molecular weight of 1,000 to 100,000.