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US 4,997,897 AGranted
Polymerizable dye
AssigneeBausch & Lomb Incorporated
InventorJohn B. Melpolder
Life of this patent
Estimating the term…
Abstract
Dye monomers of the general chemical formula ##STR1## where X denotes an unsaturated polymerizable organic radical; and R is an organic diradical with 2 to 12 carbon atoms.
Claims7
A hydrogel article formed by polymerizing a precopolymer mixture comprising a hydrophilic monomer and a compound having the general formula ##STR4## wherein:
- R denotes a divalent radical with 1 to 12 carbon atoms;
- and
- X denotes a polymerizable unsaturated organic radical.
Dependencies are inferred from the claim text.