Patent ID: 11926689
Assignee: ALCON INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 0:
1. A silicone hydrogel contact lens comprising a crosslinked polymeric material which comprises units of a polydiorganosiloxane vinylic crosslinker of formula (1), , in which:
υ1 is an integer of from 30 to 500 and ω1 is an integer of from 1 to 75, provided that ω1/υ1 is from about 0.035 to about 0.15;
X0 is O or NR′ in which R′ is hydrogen or C1-C10-alkyl;
R1 is hydrogen or methyl;
R2 and R3 independently of each other are a substituted or unsubstituted C1-C10 alkylene divalent radical or a divalent radical of —R5—O—R6— in which R5 and R6 independently of each other are a substituted or unsubstituted C1-C10 alkylene divalent radical;
R4 is a monovalent radical of formula (2), n3 is an integer of 3 to 6;
n4 is an integer of 2 to 5;
R9 is a C2-C6 hydrocarbon radical having (n4+1) valencies; and
X2 is an amide linkage of, in which R14 is hydrogen or C1-C10 alkyl,, wherein the polydiorganosiloxane vinylic crosslinker has a number average molecular weight of from about 3000 Daltons to about 80,000 Daltons.