Balanced charge polymer and hydrophilic contact lens manufacture

Details Balanced charge polymer and hydrophilic contact lens manufacture Balanced charge polymer and hydrophilic contact lens manufacture

1990-12-21

1993-12-14

Michl, Paul R.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526278, 526287, 526288, 526310, 526312, C08F 2606

Patent

active

052704157

ABSTRACT:
A water swellable crosslinked polymer of essentially balanced charge is obtained by polymerizing a polymer-forming composition comprising a cationic-anionic pair of ethylenically unsaturated monomers and a nonionic ethylenically unsaturated hydrophilic and/or hydrophobic monomer. Contact lenses formed from the polymer exhibit little if any tendency to attract soils, e.g., proteinaceous debris, to their surfaces.

REFERENCES:
patent: 4251651 (1981-02-01), Kawakami et al.
patent: 4666964 (1987-05-01), Hunter et al.
patent: 5075399 (1991-12-01), Ahmed et al.
Written Opinion by International Preliminary Examining Authority in PCT Appln. No. PCT/US91/09625.

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