| http://www.w3.org/ns/prov#value | - However, in the present invention it is possible to purify the cross-linkable prepolymer by swelling the prepolymer with water and rinsing with water to remove substantially all of the undesired constituents including monomeric, oligomeric or polymeric starting compounds and catalysts used for the preparation of the poly-HEMA and byproducts formed during the preparation of the crosslinkable prepol
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