Dual-phase zwitterionic monomers

A contact lens prepared with a hydrogel polymer made from a composition comprising a monomer having the structure as shown in Formula (I):

• wherein:
• R1 is:
• wherein Y1 and Y2 are independent of one other and each on of Y1 and Y2 is a linkage selected from the group consisting of a direct bond, C1-C6 divalent radical, O, NRa, C(O), C(O)NRa, NRaC(O), OC(O)NH, NHC(O)O, NRaC(O)NH, NHC(O)NRa, C(O)O, OC(O), NHC(O)NHZ0—NH—C(O)NH, OC(O)NHZ0—NH—C(O)O, OC(O)NHZ0—NH—C(O)NH, and NHC(O)NHZ0—NH—C(O)O;
• where Ra is H, C1-C4 alkyl or C1-C3 alkanol, and Z0 is a linear or branched C2-C12 alkylene divalent radical, or a C5-C7 cycloaliphatic divalent radical;
• wherein Z2 is selected from the group consisting of a direct bond, a C1-C12 unsubstituted or substituted, linear or branched alkylene divalent radical, an unsubstituted phenylene divalent radical, a C5-C7 cycloaliphatic divalent radical, and a C7-C12 arylalkylene divalent radical,
• wherein at least two of the groups Y1, Y2, and Z2 is not a direct bond,
• wherein R2 is selected from the following anionic groups to provide a zwitterionic monomer capable of cyclo-copolymerizing:
• where R is selected from the group consisting of a direct bond, C1-C6 divalent radical, O, NRa, C(O), C(O)NRa, NRaC(O), OC(O)NH, NHC(O)O, NRaC(O)NH, NHC(O)NRa, C(O)O, OC(O), NHC(O)NHZ0—NH—C(O)NH, OC(O)NHZ0—NH—C(O)O, OC(O)NHZ0—NH—C(O)NH, and NHC(O)NHZ0—NH—C(O)O;
• where Ra is H, C1-C4 alkyl or C1-C3 alkanol, and Z0 is a linear or branched C2-C12 alkylene divalent radical, or a C5-C7 cycloaliphatic divalent radical.