Production of borate crosslinked polyvinyl alcohol contact lense

Details Production of borate crosslinked polyvinyl alcohol contact lense Production of borate crosslinked polyvinyl alcohol contact lense

1984-07-23

1985-12-17

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Rotational molding

264 26, 351160H, 525 61, B29D 1100

Patent

active

045591865

ABSTRACT:
Soft contact lenses of polyvinyl alcohol having a weight average molecular weight of at least about 6,000, crosslinked with borate in an effective amount, to increase the elastic modulus thereof, said lenses being substantially insoluble in the ocular tear fluid environment, and methods for their preparation are disclosed. These materials are characterized by their high water content, high dissolved oxygen permeability, high optical clarity and especially their superior mechanical strength.

REFERENCES:
patent: 2444712 (1948-07-01), Segnaigo
patent: 2445555 (1948-07-01), Binda
patent: 3193542 (1965-07-01), Imai
patent: 3232916 (1966-02-01), Fogle
patent: 3928255 (1975-12-01), Milkovich et al.

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