Method of forming shaped hydrogel articles including contact...

Details Method of forming shaped hydrogel articles including contact... Method of forming shaped hydrogel articles including contact...

B - Operations, Transporting

29

D

18/104

B29D 11/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2003806

Shaped hydrogel articles such as soft contact lenses are prepared by (1) molding or casting a polymerization mixture comprising: (a) a monomer mixture comprising a major proportion of a hydrophilic (meth)acrylate ester such as 2-hydroxyethyl methacrylate, and a cross-linking monomer; and (b) a water-displaceable diluent, wherein said diluent has a viscosity of at least 100 MPa Sec at 30°C, and wherein said diluent consists essentially of a boric acid ester of certain dihydric alcohols, said dihydric alcohols having Hansen polar (.delta.p) and Hansen hydrogen bonding (.delta.h) cohesion parameters falling within the area of a circle defined as having a center at .delta.h = 20.5, .delta.p = 13, and a radius of 8.5, to produce a shaped gel of a copolymer of said monomers and said diluent, and (2) thereafter replacing said diluent with water.

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