C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2054, 88/40,
C08F 216/06 (2006.01) C08F 216/12 (2006.01) C08F 290/12 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)
Patent
CA 1330674
Polyvinyl alcohol derivatives containing pendant vinylic monomer reaction product units bound through ether groups and hydrogel contact lenses made therefrom Abstract A contact lens of a crosslinked, organic aprotic solvent insoluble, substantially transparent polymer of a derivative of a polyvinyl alcohol having a weight average molecular weight of at least about 2,000, containing an effective amount between about 0.1 and 90 percent, based on the number of hydroxyl groups on said polyvinyl alcohol, of a crosslinked addition reaction product of units of the formula Image (I) in the presence or absence of a polymerizable vinylic monomer wherein R1 is a divalent aliphatic, cycloaliphatic, aryl, aralkyl or alkaryl group; A is -O-, -NH- or -NHCON(R")- where R" is hydrogen or lower alkyl and A' is a direct bond; or A is a direct bond and A' is -O- or -O-CH2-; R2 is hydrogen or methyl; and R3 is hydrogen, methyl or -COOR4 where R4 is hydrogen or lower alkyl; with the proviso that if R2 is methyl, R3 is hydrogen; and wherein the polymerizable vinylic monomer, if present, is hydrophobic or is a mixture of hydrophobic and hydro- philic vinylic monomers in which mixture at least 50 % of vinyl monomers are hydrophobic.
585844
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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