Preparation of hydrogel for soft contact lens with water displac

Details Preparation of hydrogel for soft contact lens with water displac Preparation of hydrogel for soft contact lens with water displac

1982-03-19

1985-01-22

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523108, 526195, C08K 505, C08F 216, C08L 3308

Patent

active

044953135

ABSTRACT:
Soft contact lenses are made by polymerizing a substantially anhydrous polymerization mixture containing a polymerizable acrylic or methacrylic monomer, and a water displaceable ester of boric acid and a compound containing 3 or more hydroxyl groups so as to form a hydrophilic polymer containing at least 30% of said boric acid ester. In a preferred embodiment, the polymerizable is effected in a mould cavity where the contact between a sharp circular edge in one mould part and a spherical surface in the other mould part defines the edge of the lens and the distance between the two mould surfaces outside the sharp edge increases in all radial directions away from the center.

REFERENCES:
patent: 3965063 (1976-06-01), Holcombe
patent: 4056496 (1977-11-01), Mancini et al.
patent: 4275174 (1981-06-01), Tadakoro et al.
patent: 4405773 (1983-09-01), Loshaek et al.

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