Zwitterionic polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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C526S091000, C526S145000, C526S146000, C526S147000, C526S161000, C526S172000, C526S193000, C526S204000, C526S213000, C526S220000, C526S222000, C526S262000, C526S287000, C526S303100, C526S310000, C526S319000, C524S710000

Reexamination Certificate

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11025968

ABSTRACT:
Polymers may be made from zwitterionic monomers having controlled architectures and molecular weights, using living polymerisations such as group or atom transfer radical polymerisation. For instance polymers may be formed by atom transfer radical polymerisation using a copper chloride catalyst, a ligand which is water soluble, and a water soluble tertiary alkyl halide initiator to form homopolymers having controlled polydispersities of less than 1.5 and block copolymers with other hydrophilic or hydrophobic monomers. One suitable zwitterionic monomer is 2-methacryloyloxy-2′-trimethylammoniumethyl phosphate inner salt. The block copolymers may spontaneously form micelles, believed to have zwitterionic, for instance phosphorylcholine, groups at the external surface, which may be useful as drug delivery systems with improved biocompatibility.

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