Patent ID: 7825273

Claim:
A method of preparing a water extractable medical device forming monomer, the method comprising: dissolving a hydride containing siloxane compound in a solvent or combination of solvents; treating the dissolved hydride containing siloxane compound with an allylic halide and a hydrosilation catalyst to form a first reaction mixture; heating the first reaction mixture under a nitrogen atmosphere for a sufficient time to result in the quantitative loss of reactants as determined by appropriate analytical technique thus providing a monomer mixture; cooling the monomer mixture; concentrating the cooled mixture; dissolving the cooled mixture in a solvent appropriate for nucleophilic substitution; treating the cooled mixture containing the solvent appropriate for nucleophilic substitution with a tertiary amino-vinyl compound to form a second reaction mixture; heating the second reaction mixture at a temperature sufficient to promote reaction without causing gelation; removing any remaining solvent to provide a product containing material; and, purifying the product containing material to yield a water extractable medical device forming monomer.