Method of producing optically clear hydrophilic copolymers...

Details Method of producing optically clear hydrophilic copolymers... Method of producing optically clear hydrophilic copolymers...

C - Chemistry, Metallurgy

08

F

402/498

C08F 220/20 (2006.01) C08F 220/28 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1106545

METHOD OF PRODUCING OPTICALLY CLEAR HYDROPHILIC COPOLYMERS AND CONTACT LENSES ABSTRACT OF THE DISCLOSURE In the process of making optically clear hydrophilic copolymers formed by copolymerizing a glycol monoester of acrylic or methacrylic acid with an alkoxy monomer having the formula: Image wherein R is a C1-C4 straight or branched chain alkoxy group, R' is a C2 or C3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is either 1 or 0, and n is an integer from 1 to 20, the improvement comprising distilling at least said alkoxy monomer under high vacuum and low temp- erature prior to copolymerization, promptly adding to said distilled monomer an amount of polymerization inhibitor below that which would inhibit copolymerization, but sufficient to provide a hydrated copolymer of high optical clarity, and then copolymerizing said monomer and said glycol monoester to form said hydrophilic copolymer. The invention also comprises the improved method of making hydrophilic buttons and contact lenses, particularly corneal contact lenses, from said hydro- philic copolymers.

303840

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