Abstract: Provided is an aqueous composition comprising (a) 0.5% to 5% one or more dissolved cellulose derivative, by weight based on the weight of the solution, and (b) 1% to 10% one or more dissolved polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer, by weight based on the weight of the solution; wherein said aqueous solution has complex viscosity of 20 mPa*s or less at 25° C.

Abstract: A method for making biocompatible polymeric matrices, particularly polymeric particles, that have functional groups on the surface thereof are provided. The method comprises: providing a biocompatible base polymer; providing a surface-active, functional polymer, hereinafter referred to as an “SAFP”; entangling chains of the base polymer with chains of the SAFP, both of which are in a mobile state; and then demobilizing the base polymer chains to form a polymeric particle or matrix having a specific geometry. Polymeric particles having functional groups on the surface thereof are also provided. The particles comprise a biocompatible base polymer and an SAFP. The SAFP comprises one or more interactive regions for physically cross-linking with the base polymer, and one or more hydrophilic regions. The particles have a core region and an outer region having a an outer surface. The core region contains a plurality of biocompatible base polymer chains.