Polymerizable compositions comprising a urethane oligomer as crosslinking agent, polymers and hydrated polymers obtained from these compositions, and finished and semi-finished articles formed using these polymers
AssigneesEssilor International (Compagnie Generale d'Optique), Sunsoft Corp.
InventorIsabelle Calderada
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Abstract
The disclosed polymerizable compositions comprise a monomer or a mixture of hydrophilic monomers, as well as a crosslinking agent comprised of an oligomer or a mixture of urethane oligomers having a mole weight of between 500 and 5,000 and two to six (meth)acrylate functions. The invention can be used in the manufacture of contact lenses.
Claims30
A polymerizable composition comprising a hydrophilic monomer or hydrophilic monomer mixture and 0.05 to 4 parts by weight per hundred parts by weight of the agent, wherein the crosslinking agent comprises a urethane oligomer having a molar mass of between 500 and 5000, the limits being inclusive, and the chain of which carries two to six (meth)acrylate functional groups, or a mixture of these urethane oligomers, said polymerizable composition having after polymerization resalting in a cross-linked polymer material having a degree of hydrophilicity of greater than 40 percent.
Dependencies are inferred from the claim text.