Hydrogel polymers

Details Hydrogel polymers Hydrogel polymers

1987-01-27

1988-06-07

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C08F 2608

Patent

active

047497610

ABSTRACT:
A cross-linked, hydrogel polymer for contact lenses with a water uptake of between 60 and 70% by weight based on the total weight of hydrogel is formed from a mixture of monomer components containing (1) N-vinyl-2-pyrrolidone, (2) alkyl methacrylate and (3) a compound of formula ##STR1## in which R.sup.1 is hydrogen or a lower alkyl group, preferably methyl, and R.sup.2 is either a substituted or unsubstituted aryl group or an alkyl group containing from 1 to 6 carbon atoms substituted by a substituted or unsubstituted aryl group or a substituted or unsubstituted aryloxygroup or by a cycloalkyloxygroup. Preferably the alkyl methacrylate is hydroxyethyl methacrylate and the third component phenethyl methacrylate. Cross-linking agents used preferably have their two functional groups differing in reactivity, for example allyl methacrylate.

REFERENCES:
patent: 3639524 (1972-02-01), Seiderman
patent: 3937680 (1976-02-01), de Carle
patent: 4022754 (1977-05-01), Howes et al.
patent: 4036814 (1977-07-01), Howes et al.
patent: 4184992 (1980-01-01), Hosaka
patent: 4361689 (1982-11-01), Patel et al.
patent: 4463148 (1984-07-01), Hofer et al.
patent: 4620954 (1986-11-01), Singer et al.

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