abstract |
The present invention provides a graft copolymer delivery vehicle comprising a polyethylene glycol (PEG) -polyacetal (PA) copolymer or a polyethylene glycol (PEG) -polyacetal (PA) -polyorthoester (POE) copolymer. Polyethylene glycol-polyacetal graft copolymers or polyethylene glycol-polyacetal-polyorthoester graft copolymers suitable for the present invention, in particular PA-g-PEG or PA-POE-g-PEG, are represented by formulas I and V. |